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Artykuły w czasopismach na temat „Neutron dark decay”

Autor: Grafiati
Data publikacji: 7 grudnia 2024
Data aktualizacji: 31 lipca 2025

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1

Fornal, Bartosz. "Neutron Dark Decay." Universe 9, no. 10 (2023): 449. http://dx.doi.org/10.3390/universe9100449.

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There exists a puzzling disagreement between the results for the neutron lifetime obtained in experiments using the beam technique versus those relying on the bottle method. A possible explanation of this discrepancy postulates the existence of a beyond-Standard-Model decay channel of the neutron involving new particles in the final state, some of which can be dark matter candidates. We review the current theoretical status of this proposal and discuss the particle physics models accommodating such a dark decay. We then elaborate on the efforts undertaken to test this hypothesis, summarizing t
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2

Sun, X., E. Adamek, B. Allgeier та ін. "Search for neutron dark decay: n → χ + e+e−". EPJ Web of Conferences 219 (2019): 05008. http://dx.doi.org/10.1051/epjconf/201921905008.

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In January, 2018, Fornal and Grinstein proposed that a previously unobserved neutron decay branch to a dark matter particle (χ) could account for the discrepancy in the neutron lifetime observed in two different types of experiments. One of the possible final states discussed includes a single χ along with an e+e− pair. We use data from the UCNA (Ultracold Neutron Asymmetry) experiment to set limits on this decay channel. Coincident electron-like events are detected with ∼ 4π acceptance using a pair of detectors that observe a volume of stored Ultracold Neutrons (UCNs). We use the timing infor
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3

Zhou, Dake. "Neutron Star Constraints on Neutron Dark Decays." Universe 9, no. 11 (2023): 484. http://dx.doi.org/10.3390/universe9110484.

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Motivated by the neutron lifetime puzzle, it is proposed that neutrons may decay into new states yet to be observed. We review the neutron star constraints on dark fermions carrying unit baryon number with masses around 939 MeV, and discuss the interaction strengths required for the new particle. The possibility of neutrons decaying into three dark fermions is investigated. While up to six flavors of dark quarks with masses around 313 MeV can be compatible with massive pulsars, any such exotic states lighter than about 270 MeV are excluded by the existence of low-mass neutron stars around ∼1.2
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4

Motta, T. F., P. A. M. Guichon, and A. W. Thomas. "Neutron to dark matter decay in neutron stars." International Journal of Modern Physics A 33, no. 31 (2018): 1844020. http://dx.doi.org/10.1142/s0217751x18440207.

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Recent proposals have suggested that a previously unknown decay mode of the neutron into a dark matter particle could solve the long lasting measurement problem of the neutron decay width. We show that, if the dark particle in neutron decay is the major component of the dark matter in the universe, this proposal is in disagreement with modern astrophysical data concerning neutron star masses.
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5

Beck, D. H. "Neutron decay, dark matter and neutron stars." EPJ Web of Conferences 219 (2019): 05006. http://dx.doi.org/10.1051/epjconf/201921905006.

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Following up on a suggestion that decay to a dark matter fermion might explain the 4σ discrepancy in the neutron lifetime, we consider the implications of such a fermion on neutron star structure. We find that including it reduces the maximum neutron star mass to well below the observed masses. In order to recover stars with the observed masses, the (repulsive) self-interactions of the dark fermion would have to be stronger than those of the nucleon-nucleon interaction.
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6

Wietfeldt, Fred E. "The Neutron Lifetime Discrepancy and Its Implications for Cosmology and Dark Matter." Symmetry 16, no. 8 (2024): 956. http://dx.doi.org/10.3390/sym16080956.

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Free neutron decay is the prototype for nuclear beta decay and other semileptonic weak particle decays. It provides important insights into the symmetries of the weak nuclear force. Neutron decay is important for understanding the formation and abundance of light elements in the early universe. The two main experimental approaches for measuring the neutron lifetime, the beam method and the ultracold neutron storage method, have produced results that currently differ by 9.8 ± 2.0 s. While this discrepancy probably has an experimental origin, a more exciting prospect is that it may be explained
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7

Husain, Wasif, Dipan Sengupta, and A. W. Thomas. "Constraining Dark Boson Decay Using Neutron Stars." Universe 9, no. 7 (2023): 307. http://dx.doi.org/10.3390/universe9070307.

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Inspired by the well-known anomaly in the lifetime of the neutron, we investigated its consequences inside neutron stars. We first assessed the viability of the neutron decay hypothesis suggested by Fornal and Grinstein within neutron stars, in terms of the equation of state and compatibility with observed properties. This was followed by an investigation of the constraint information on neutron star cooling that can be placed on the decay rate of the dark boson into standard model particles, in the context of various BSM ideas.
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8

Husain, Wasif, Theo F. Motta, and Anthony W. Thomas. "Consequences of neutron decay inside neutron stars." Journal of Cosmology and Astroparticle Physics 2022, no. 10 (2022): 028. http://dx.doi.org/10.1088/1475-7516/2022/10/028.

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Abstract The hypothesis that neutrons might decay into dark matter is explored using neutron stars as a testing ground. It is found that in order to obtain stars with masses at the upper end of those observed, the dark matter must experience a relatively strong self-interaction. Conservation of baryon number and energy then require that the star must undergo some heating, with a decrease in radius, leading to an increase in speed of rotation over a period of days.
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9

Fornal, Bartosz, and Benjamín Grinstein. "Dark side of the neutron?" EPJ Web of Conferences 219 (2019): 05005. http://dx.doi.org/10.1051/epjconf/201921905005.

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We discuss our recently proposed interpretation of the discrepancy between the bottle and beam neutron lifetime experiments as a sign of a dark sector. The difference between the outcomes of the two types of measurements is explained by the existence of a neutron dark decay channel with a branching fraction 1%. Phenomenologically consistent particle physics models for the neutron dark decay can be constructed and they involve a strongly self-interacting dark sector. We elaborate on the theoretical developments around this idea and describe the efforts undertaken to verify it experimentally.
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10

Karananas, Georgios K., and Alexis Kassiteridis. "Small-scale structure from neutron dark decay." Journal of Cosmology and Astroparticle Physics 2018, no. 09 (2018): 036. http://dx.doi.org/10.1088/1475-7516/2018/09/036.

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11

Fornal, Bartosz, and Benjamín Grinstein. "Neutron’s dark secret." Modern Physics Letters A 35, no. 31 (2020): 2030019. http://dx.doi.org/10.1142/s0217732320300190.

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The existing discrepancy between neutron lifetime measurements in bottle and beam experiments has been interpreted as a sign of the neutron decaying to dark particles. We summarize the current status of this proposal, including a discussion of particle physics models involving such a portal between the Standard Model and a baryonic dark sector. We also review further theoretical developments around this idea and elaborate on the prospects for verifying the neutron dark decay hypothesis in current and upcoming experiments.
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12

Ivanov, Andrey N., Roman Höllwieser, Nataliya I. Troitskaya, Markus Wellenzohn, and Yaroslav A. Berdnikov. "Electrodisintegration of Deuteron into Dark Matter and Proton Close to Threshold." Symmetry 13, no. 11 (2021): 2169. http://dx.doi.org/10.3390/sym13112169.

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We discuss an investigation of the dark matter decay modes of the neutron, proposed by Fornal and Grinstein (2018–2020), Berezhiani (2017, 2018) and Ivanov et al. (2018) for solution of the neutron lifetime anomaly problem, through the analysis of the electrodisintegration of the deuteron d into dark matter fermions χ and protons p close to threshold. We calculate the triple-differential cross section for the reaction e−+d→χ+p+e− and propose to search for such a dark matter channel in coincidence experiments on the electrodisintegration of the deuteron e−+d→n+p+e− into neutrons n and protons c
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13

Fornal, Bartosz, and Benjamin Grinstein. "Dark particle interpretation of the neutron decay anomaly." Journal of Physics: Conference Series 1308 (August 2019): 012010. http://dx.doi.org/10.1088/1742-6596/1308/1/012010.

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14

Shirke, Swarnim, Suprovo Ghosh, Debarati Chatterjee, Laura Sagunski, and Jürgen Schaffner-Bielich. "R-modes as a new probe of dark matter in neutron stars." Journal of Cosmology and Astroparticle Physics 2023, no. 12 (2023): 008. http://dx.doi.org/10.1088/1475-7516/2023/12/008.

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Abstract In this work, we perform the first systematic investigation of effects of the presence of dark matter on r-mode oscillations in neutron stars (NSs). Using a self-interacting dark matter (DM) model based on the neutron decay anomaly and a hadronic model obtained from the posterior distribution of a recent Bayesian analysis, we impose constraints on the DM self-interaction strength using recent multimessenger astrophysical observations. We also put new constraints on the DM fraction for this model of DM. The constrained DM interaction strength is then used to estimate DM self-interactio
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15

Bianchi, Abele, and Giovanni Guido. "From the Dark Neutron to the Neutron Decay Anomaly and Lithium Cosmologic Problem." Journal of High Energy Physics, Gravitation and Cosmology 08, no. 03 (2022): 494–516. http://dx.doi.org/10.4236/jhepgc.2022.83036.

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16

Dymnikova, Irina, and Maxim Khlopov. "Regular black hole remnants and graviatoms with de Sitter interior as heavy dark matter candidates probing inhomogeneity of early universe." International Journal of Modern Physics D 24, no. 13 (2015): 1545002. http://dx.doi.org/10.1142/s0218271815450029.

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We address the question of regular primordial black holes with de Sitter interior, their remnants and gravitational vacuum solitons G-lumps as heavy dark matter candidates providing signatures for inhomogeneity of early universe, which is severely constrained by the condition that the contribution of these objects in the modern density does not exceed the total density of dark matter. Primordial black holes and their remnants seem to be most elusive among dark matter candidates. However, we reveal a nontrivial property of compact objects with de Sitter interior to induce proton decay or decay
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17

Klopf, Michael, Erwin Jericha, Bastian Märkisch, Heiko Saul, Torsten Soldner та Hartmut Abele. "Dark decay channel analysis (n → χ + e+ e−) with the PERKEO II experiment". EPJ Web of Conferences 219 (2019): 05007. http://dx.doi.org/10.1051/epjconf/201921905007.

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Discrepancies from beam and bottle type experiments measuring the neutron lifetime are on the 4σ level. In recent publications Fornal and Grinstein proposed that the puzzle could be solved if the neutron would decay on the one percent level via a dark decay mode [1], one possible branch being n → χ + e+e−. With data from the Perkeo II experiment we set limits on the branching fraction and exclude a one percent contribution for 96% of the allowed mass range for the dark matter particle. With this publication, we give a detailed description of the experiment and some selected details of the anal
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18

Märkisch, B., H. Abele, D. Dubbers, H. Saul, and T. Soldner. "Accurate Measurement of the Beta-Asymmetry in Neutron Decay Rules out Dark Decay Mode." Journal of Surface Investigation: X-ray, Synchrotron and Neutron Techniques 14, S1 (2020): S140—S143. http://dx.doi.org/10.1134/s1027451020070319.

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19

Das, H. C., and G. F. Burgio. "Neutron Decay Anomaly and Its Effects on Neutron Star Properties." Universe 11, no. 5 (2025): 159. https://doi.org/10.3390/universe11050159.

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We investigate the effects of dark matter (DM) on neutron star (NS) properties using the neutron decay anomaly model within the relativistic mean-field (RMF) framework. Three nucleonic models (HCD0–HCD2) are developed, satisfying astrophysical constraints such as the maximum NS mass (≥2M⊙), the NICER mass–radius limits, and the tidal deformability constraint from the GW170817 event. The equation of states of the NS admixed with DM (DMANS) is calculated by incorporating the self-interactions between them. The macroscopic properties, such as mass, radius, and tidal deformability of the NSs, are
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20

Terol-Calvo, Jorge. "Supernova Constraints on Dark Flavored Sectors." Journal of Physics: Conference Series 2156, no. 1 (2021): 012056. http://dx.doi.org/10.1088/1742-6596/2156/1/012056.

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Abstract Proto-neutron stars forming a few seconds after core-collapse supernovae are hot and dense environments where hyperons can be efficiently produced by weak processes. By making use of various state-of-the-art supernova simulations combined with the proper extensions of the equations of state including Λ hyperons, we calculate the cooling of the star induced by the emission of dark particles X0 through the decay Λ → nX 0. Comparing this novel energy-loss process to the neutrino cooling of SN 1987A allows us to set a stringent upper limit on the branching fraction, BR(Λ → nX 0) ≤ 8 × 10−
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21

Fischer, Tobias, Jorge Martin Camalich, Hristijan Kochankovski, and Laura Tolos. "Hyperons during proto-neutron star deleptonization and the emission of dark flavoured particles." Journal of Cosmology and Astroparticle Physics 2025, no. 01 (2025): 061. https://doi.org/10.1088/1475-7516/2025/01/061.

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Abstract Complementary to high-energy experimental efforts, indirect astrophysical searches of particles beyond the standard model have long been pursued. The present article follows the latter approach and considers, for the first time, the self-consistent treatment of the energy losses from dark flavoured particles produced in the decay of hyperons during a core-collapse supernova (CCSN). To this end, general relativistic supernova simulations in spherical symmetry are performed, featuring six-species Boltzmann neutrino transport, and covering the long-term evolution of the nascent remnant p
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22

Vergados, J. D. "Searching for light WIMPS in view of neutron decay to dark matter." Journal of Physics G: Nuclear and Particle Physics 46, no. 10 (2019): 105002. http://dx.doi.org/10.1088/1361-6471/ab326d.

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23

Jeong, Kwang Sik, Ju Hyeong Kang, and Shota Nakagawa. "Cosmological roles of dark photons in axion-induced electroweak baryogenesis." Journal of Cosmology and Astroparticle Physics 2025, no. 01 (2025): 047. https://doi.org/10.1088/1475-7516/2025/01/047.

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Abstract By coupling to both the Higgs and electroweak gauge sectors, an axion can generate the matter-antimatter asymmetry in the universe via electroweak baryogenesis when the axion decay constant lies within the range of approximately 105 and 107 GeV, corresponding to axion masses between the MeV and GeV scales. In this work, we explore the intriguing possibility that the axion interacts with a dark sector, particularly with dark photons through anomalous couplings. Notably, axion-coupled dark photons can play multiple roles, including (i) suppressing the branching ratio of axion decay to S
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24

Berezhiani, Zurab. "Matter, dark matter, and antimatter in our Universe." International Journal of Modern Physics A 33, no. 31 (2018): 1844034. http://dx.doi.org/10.1142/s0217751x18440347.

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I discuss the possibility of dark matter conversion into our antimatter, assuming that a part of dark matter is represented by a hypothetical mirror matter. In the Early Universe, [Formula: see text] and [Formula: see text] violating interactions between the particles of ordinary and mirror worlds can co-generate their baryon asymmetries in comparable amounts, [Formula: see text], also predicting the sign of mirror baryon asymmetry. At low energies, the same interactions induce particle mixing phenomena between two sectors. In this way, e.g. mirror neutron [Formula: see text] should oscillate
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25

Solmaz, M., M. Balzer, K. Eitel, et al. "Design of a mobile neutron spectrometer for the Laboratori Nazionali del Gran Sasso (LNGS)." Journal of Instrumentation 18, no. 10 (2023): P10022. http://dx.doi.org/10.1088/1748-0221/18/10/p10022.

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Abstract Environmental neutrons are a source of background for rare event searches (e.g., dark matter direct detection and neutrinoless double beta decay experiments) taking place in deep underground laboratories. The overwhelming majority of these neutrons are produced in the cavern walls by means of intrinsic radioactivity of the rock and concrete. Their flux and spectrum depend on time and location. Precise knowledge of this background is necessary to devise sufficient shielding and veto mechanisms, improving the sensitivity of the neutron-susceptible underground experiments. In this report
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26

McKeen, David, and Maxim Pospelov. "How Long Does the Hydrogen Atom Live?" Universe 9, no. 11 (2023): 473. http://dx.doi.org/10.3390/universe9110473.

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It is possible that the proton is stable while atomic hydrogen is not. This is the case in models with new particles carrying baryon number which are light enough to be stable themselves, but heavy enough so that proton decay is kinematically blocked. Models of new physics that explain the neutron lifetime anomaly generically have this feature, allowing for atomic hydrogen to decay through electron capture on a proton. We calculate the radiative hydrogen decay rate involving the emission of a few hundred keV photon, which makes this process experimentally detectable. In particular, we show tha
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27

Serebrov A. P., Lyamkin V. A., Fomin A. K., and Onegin M. S. "Superfluid helium based ultracold neutron source for the PIK reactor." Technical Physics 92, no. 6 (2022): 763. http://dx.doi.org/10.21883/tp.2022.06.54425.21-22.

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The PIK reactor at NRC "Kurchatov Institute"-PNPI is going to be equipped with a high-flux Ultra Cold Neutron (UCN) source for fundamental physics researches. The UCN source will use superfluid helium, which will make possible to achieve the density of UCN 2.2·10^3 cm-3, that has not yet been achieved anywhere in the world. The UCN source will be installed on the GEK-4 channel, which will make possible to obtain a low value of heat influx to cryogenic vessels from reactor radiation. The heat removal from the UCN source vessel will be implemented by using a heat exchanger. The
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28

Gimsa, Andreas. "Calculation of the Neutrino Mass." International Journal of Scientific Research and Management 8, no. 05 (2020): 13–19. http://dx.doi.org/10.18535/ijsrm/v8i05.aa01.

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The determination of the neutrino mass is considered an important milestone in physics and especially in cosmology. Because it is so extraordinarily small, the usual methods for determining the mass of elementary particles fail. After Wolfgang Pauli's prediction of the neutrino in 1930, experimental proof was not possible until 1956, when an electron antineutrino met a proton and produced a positron and a neutron. The Karlsruhe Tritium Neutrino Experiment KATRIN [1.] is intended to determine the neutrino mass with unique accuracy or, if the sensitivity of the measuring technique is not yet suf
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29

AHLEN, S. P. "TIME-PROJECTION-CHAMBERS WITH OPTICAL READOUT FOR DARK MATTER, DOUBLE BETA DECAY, AND NEUTRON MEASUREMENTS." International Journal of Modern Physics A 25, no. 24 (2010): 4525–75. http://dx.doi.org/10.1142/s0217751x10050081.

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In recent years, there have been impressive advances in the technology of cameras using charged coupled devices (CCD's) and electron multiplying charged coupled devices (EMCCD's) that make possible a number of applications for the detection of ionizing radiation. The new cameras have quantum efficiencies exceeding 90%, effective noise levels less than one electron per pixel, and can be made to detect light ranging from the ultraviolet to the infrared. When combined with photomultiplier tubes (PMT's), and when used with Time-Projection-Chambers (TPC's) that contain narrow gap mesh charge amplif
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30

Wu, Tong. "KL0→γ+darkphoton(γ¯) Search at the J-PARC KOTO Experiment". Journal of Physics: Conference Series 2446, № 1 (2023): 012054. http://dx.doi.org/10.1088/1742-6596/2446/1/012054.

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Abstract We present the study of massless dark photons in the decay of K L 0 → γ γ ¯ in the J-PARC KOTO experiment. The massless dark photon ( γ ¯ ) is different from the massive dark photon because it does not mix directly with ordinary photons, but it could interact with SM particles through direct coupling with quarks. In some theoretical predictions, the B R ( K L 0 → γ γ ¯ ) can be as large as 𝒪(10-3), which is well within the sensitivity of KOTO. Because of the lack of kinematic constraints, searching for K L 0 → γ γ ¯ could be challenging, but the hermetic veto system of KOTO provides a
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31

Trzaska, W. H., T. Enqvist, K. Jedrzejczak, et al. "DM-like anomalies in neutron multiplicity spectra." Journal of Physics: Conference Series 2156, no. 1 (2021): 012029. http://dx.doi.org/10.1088/1742-6596/2156/1/012029.

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Abstract A new experiment collects data, since November 2019, at a depth of 210 m.w.e. in the Callio Lab in the Pyhasalmi mine in Finland. The setup, called NEMESIS (New Emma MEasurementS Including neutronS), incorporates infrastructure from the EMMA experiment with neutron and large-area plastic scintillator detectors. The experiment’s primary aim is to combine muon tracking with position-sensitive neutron detection to measure precision yields, multiplicities, and lateral distributions of high-multiplicity neutron events induced by cosmic muons in various materials. The data are relevant for
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32

Lewicka, Sylwia, and Jerzy Dryzek. "Positron Annihilation Characteristics in Superstrong Magnetic Fields." Materials Science Forum 666 (December 2010): 31–34. http://dx.doi.org/10.4028/www.scientific.net/msf.666.31.

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The recent interest in positrons distribution in the space revealed the anomalous presence of high energetic positrons. There are different possible origins of such positrons, including the decay of heavy particles in the dark matter, also pulsars or neutron stars. In our study we calculated the annihilation properties of the electron – positron bound system in superstrong magnetic fields expected for neutron stars. For this aim we use solutions of the (relativistic) Bethe-Salpeter equation derived by L.B. Leinson and A. Perez [1]. The results indicate strong dependency of the annihilation pro
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33

Zhao, Zhiyu. "Design of a LYSO crystal calorimeter for dark photon detection in the DarkSHINE experiment." EPJ Web of Conferences 320 (2025): 00009. https://doi.org/10.1051/epjconf/202532000009.

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The DarkSHINE experiment aims to detect dark photons, a candidate for light dark matter, using a high-frequency electron beam from the Shanghai High Repetition-Rate XFEL and Extreme Light Facility. The Electromagnetic Calorimeter (ECAL) in DarkSHINE serves to precisely measure the energy of recoil electrons and bremsstrahlung photons. It is a homogeneous calorimeter composed of LYSO crystal scintillators, which was chosen for its fast decay time, high light yield, and strong radiation resistance. Through comprehensive simulations, the ECAL dimensions were optimized to 52.5×52.5×44 cm3, balanci
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34

Jeong, Kwang Sik, Kohei Matsukawa, Shota Nakagawa, and Fuminobu Takahashi. "Cosmological effects of Peccei-Quinn symmetry breaking on QCD axion dark matter." Journal of Cosmology and Astroparticle Physics 2022, no. 03 (2022): 026. http://dx.doi.org/10.1088/1475-7516/2022/03/026.

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Abstract We study cosmological effects of explicit Peccei-Quinn breaking on the QCD axion dark matter. We find that the axion abundance decreases or increases significantly depending on the initial position, even for a tiny Peccei-Quinn breaking that satisfies the experimental bound of the neutron electric dipole measurements. If the axion first starts to oscillate around a wrong vacuum and if it gets trapped there until the false vacuum disappears due to non-perturbative QCD effects, its abundance increases significantly and is independent of the decay constant fa , as first pointed out in re
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35

Lee, Billy K. K., Ming-chung Chu, and Lap-Ming Lin. "Could the GW190814 Secondary Component Be a Bosonic Dark Matter Admixed Compact Star?" Astrophysical Journal 922, no. 2 (2021): 242. http://dx.doi.org/10.3847/1538-4357/ac2735.

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Abstract We investigate whether the recently observed 2.6 M ⊙ compact object in the gravitational wave event GW190814 can be a bosonic dark matter (DM) admixed compact star. By considering the three constraints of mass, radius, and the stability of such an object, we find that if the DM is made of QCD axions, their particle mass m is constrained to a range that has already been ruled out by the independent constraint imposed by the stellar-mass black hole superradiance process. The 2.6 M ⊙ object can still be a neutron star admixed with at least 2.0 M ⊙ of DM made of axion-like particles (or e
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36

Falcke, Heino, Michael F. Wondrak, and Walter D. van Suijlekom. "An upper limit to the lifetime of stellar remnants from gravitational pair production." Journal of Cosmology and Astroparticle Physics 2025, no. 05 (2025): 023. https://doi.org/10.1088/1475-7516/2025/05/023.

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Abstract Black holes are assumed to decay via Hawking radiation. Recently we found evidence that spacetime curvature alone without the need for an event horizon leads to black hole evaporation. Here we investigate the evaporation rate and decay time of a non-rotating star of constant density due to spacetime curvature-induced pair production and apply this to compact stellar remnants such as neutron stars and white dwarfs. We calculate the creation of virtual pairs of massless scalar particles in spherically symmetric asymptotically flat curved spacetimes. This calculation is based on covarian
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Babichev, Eugeny, Christos Charmousis, Benjamin Muntz, Antonio Padilla, and Ippocratis D. Saltas. "Horndeski speed tests with scalar-photon couplings." Journal of Cosmology and Astroparticle Physics 2025, no. 01 (2025): 041. https://doi.org/10.1088/1475-7516/2025/01/041.

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Abstract We revisit multi-messenger constraints from neutron star mergers on the speed of propagation of gravitational and electromagnetic waves in Horndeski and beyond Horndeski theories. By considering non-trivial couplings between the dark energy field and the electromagnetic sector, the electromagnetic wave can propagate through the cosmological background at non-unit speed, altering the phenomenological constraints on its gravitational counterpart. In particular, we show that recent models derived from a Kaluza-Klein compactification of higher dimensional Horndeski models fall into a broa
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38

Grayling, M., C. P. Gutiérrez, M. Sullivan, et al. "Understanding the extreme luminosity of DES14X2fna." Monthly Notices of the Royal Astronomical Society 505, no. 3 (2021): 3950–67. http://dx.doi.org/10.1093/mnras/stab1478.

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ABSTRACT We present DES14X2fna, a high-luminosity, fast-declining Type IIb supernova (SN IIb) at redshift z = 0.0453, detected by the Dark Energy Survey (DES). DES14X2fna is an unusual member of its class, with a light curve showing a broad, luminous peak reaching Mr ≃ −19.3 mag 20 d after explosion. This object does not show a linear decline tail in the light curve until ≃60 d after explosion, after which it declines very rapidly (4.30 ± 0.10 mag 100 d−1 in the r band). By fitting semi-analytic models to the photometry of DES14X2fna, we find that its light curve cannot be explained by a stand
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39

Fuß, Lea, Mathias Garny, and Alejandro Ibarra. "Minimal decaying dark matter: from cosmological tensions to neutrino signatures." Journal of Cosmology and Astroparticle Physics 2025, no. 01 (2025): 055. https://doi.org/10.1088/1475-7516/2025/01/055.

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Abstract The invisible decay of cold dark matter into a slightly lighter dark sector particle on cosmological time-scales has been proposed as a solution to the S 8 tension. In this work we discuss the possible embedding of this scenario within a particle physics framework, and we investigate its phenomenology. We identify a minimal dark matter decay setup that addresses the S 8 tension, while avoiding the stringent constraints from indirect dark matter searches. In our scenario, the dark sector contains two singlet fermions N 1,2, quasi-degenerate in mass, and carrying lepton number so that t
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40

Abusleme, Angel, Thomas Adam, Shakeel Ahmad, et al. "JUNO sensitivity to the annihilation of MeV dark matter in the galactic halo." Journal of Cosmology and Astroparticle Physics 2023, no. 09 (2023): 001. http://dx.doi.org/10.1088/1475-7516/2023/09/001.

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Abstract We discuss JUNO sensitivity to the annihilation of MeV dark matter in the galactic halo via detecting inverse beta decay reactions of electron anti-neutrinos resulting from the annihilation. We study possible backgrounds to the signature, including the reactor neutrinos, diffuse supernova neutrino background, charged- and neutral-current interactions of atmospheric neutrinos, backgrounds from muon-induced fast neutrons and cosmogenic isotopes. A fiducial volume cut, as well as the pulse shape discrimination and the muon veto are applied to suppress the above backgrounds. It is shown t
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41

Ivanov, A. N., R. Höllwieser, N. I. Troitskaya, M. Wellenzohn та Ya A. Berdnikov. "Neutron dark matter decays and correlation coefficients of neutron β−-decays". Nuclear Physics B 938 (січень 2019): 114–30. http://dx.doi.org/10.1016/j.nuclphysb.2018.11.005.

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42

Seto, Osamu, and Takashi Shimomura. "Underground detections of an extra gauge interacting sterile neutrino dark matter." Journal of Physics: Conference Series 2156, no. 1 (2021): 012053. http://dx.doi.org/10.1088/1742-6596/2156/1/012053.

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Abstract We show that decay products from sterile neutrino dark matter in extra U(1) models are detectable in both direct dark matter detection experiments and neutrino telescope. The sterile neutrino dark matter interacts with a light gauge boson and decays into neutrinos. Those neutrinos could scatter off nuclei with a large enough recoil energy in direct dark matter detection experiments as WIMPs do.
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43

Naydenov, M. "Phenomenology of dark tensor currents." Journal of Physics: Conference Series 2668, no. 1 (2023): 012003. http://dx.doi.org/10.1088/1742-6596/2668/1/012003.

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Abstract In this work we suggest a dark mediator model which extends the usual U(1) Lagrangian by including new degrees of freedom coupling to Standard Model fermions. Such dark particles can contribute to the neutral pion decay. For interaction constant and the dark particle mass consistent with the observed anomalies in the nuclear decays by the ATOMKI group we show that the dark tensor particles naturally incorporate lepton universality violation which introduces sizable effect on the muon anomalous magnetic moment.
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44

Biekert, A., C. Chang, L. Chaplinsky, et al. "A portable and monoenergetic 24 keV neutron source based on 124Sb-9Be photoneutrons and an iron filter." Journal of Instrumentation 18, no. 07 (2023): P07018. http://dx.doi.org/10.1088/1748-0221/18/07/p07018.

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Abstract A portable monoenergetic 24 keV neutron source based on the 124Sb-9Be photoneutron reaction and an iron filter has been constructed and characterized. The coincidence of the neutron energy from SbBe and the low interaction cross-section with iron (mean free path up to 29 cm) makes pure iron specially suited to shield against gamma rays from 124Sb decays while letting through the neutrons. To increase the 124Sb activity and thus the neutron flux, a >1 GBq 124Sb source was produced by irradiating a natural Sb metal pellet with a high flux of thermal neutrons in a nuclear reactor. The
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45

Hannestad, Steen. "Decay-Produced Neutrino Hot Dark Matter." Physical Review Letters 80, no. 21 (1998): 4621–24. http://dx.doi.org/10.1103/physrevlett.80.4621.

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46

Covi, Laura, Michael Grefe, Alejandro Ibarra, and David Tran. "Neutrino signals from dark matter decay." Journal of Cosmology and Astroparticle Physics 2010, no. 04 (2010): 017. http://dx.doi.org/10.1088/1475-7516/2010/04/017.

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47

Du, Zhao-Wei, HouJun Lü, Xiaoxuan Liu, XiLong Fan, and EnWei Liang. "How to Identify the Object with a Mass Range of (2.2–3) M ⊙ in the Merger of Compact Star Systems." Astrophysical Journal 985, no. 1 (2025): 42. https://doi.org/10.3847/1538-4357/adcb49.

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Abstract High-frequency gravitational-wave (GW) radiation has been detected by LIGO-Virgo-KAGRA in the merger of compact stars. However, in two GW events, GW190814 and GW200210, the mass of one companion object falls into the mass region of (2.2–3) M ⊙, and how to identify such an object (e.g., as a low-mass black hole (BH) or a massive neutron star (NS)) remains an open question. In this paper, we propose a method to identify the mystery compact object (MCO) with the mass region of (2.2–3) M ⊙ in a binary system via the possible electromagnetic (EM) radiations before and after the mergers. A
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48

KIM, HANG BAE. "SIGNALS FOR LIGHT DARK MATTER AXINO." Modern Physics Letters A 22, no. 25n28 (2007): 2113–20. http://dx.doi.org/10.1142/s0217732307025364.

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Light dark matter aims at explaining the 511 keV γ-ray line emission from the galactic bulge as well as cold dark matter in our universe. The former is achieved via the annihilations or decays of light dark matter particles, which implies interesting observational consequences in addition to 511 keV γ-rays. We consider the axino in the 1 ~ 10 MeV mass range as the light dark matter particle and discuss the particle physics models for it, its cosmological production, and its decay arising from R-parity violation. For additional observational signals, we consider the connection to the neutrino d
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49

Lichkunov, Alexey, Konstantin Stankevich, Alexander Studenikin, and Maxim Vyalkov. "Neutrino quantum decoherence engendered by neutrino decay to photons, familons and gravitons." Journal of Physics: Conference Series 2156, no. 1 (2021): 012240. http://dx.doi.org/10.1088/1742-6596/2156/1/012240.

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Abstract We developed the previously proposed theoretical framework based on the quantum field theory of open systems applied to neutrinos. Within this framework we have considered the neutrino evolution and neutrino flavour oscillations taking into account for the decay of a heavier neutrino state to a lighter neutrino state and to a massless particle, namely photons, dark photons, axion-like particles and gravitons. We have shown that the neutrino evolution accounting for the decays will be governed by the Lindblad master equation, in which the decoherence parameters are proportional to the
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50

GUO, WAN-LEI, YUE-LIANG WU, and YU-FENG ZHOU. "DARK MATTER CANDIDATES IN LEFT-RIGHT SYMMETRIC MODELS." International Journal of Modern Physics D 20, no. 08 (2011): 1389–97. http://dx.doi.org/10.1142/s0218271811019578.

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We discuss an extended left-right symmetric model in which the decay of DM particle is induced by tiny soft charge-conjugation violating interactions, and calculate the spectra for cosmic-ray positrons, neutrinos and gamma-rays. The DM signals in the flux of high energy neutrinos can be significantly enhanced, as the triplets couple to both charged leptons and neutrinos. The predicted neutrino-induced muon flux can be several times larger than the case in which DM particle only directly decays into charged leptons. In addition, the charged components of the triplet give extra contributions to
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