Gotowe bibliografie tematyczne / Neutron lifetime discrepancy

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Gotowa bibliografia na temat „Neutron lifetime discrepancy”

Autor: Grafiati

Data publikacji: 7 grudnia 2024

Data aktualizacji: 31 lipca 2025

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Artykuły w czasopismach na temat "Neutron lifetime discrepancy"

Wietfeldt, F. "Measurements of the Neutron Lifetime." Atoms 6, no. 4 (2018): 70. http://dx.doi.org/10.3390/atoms6040070.

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Free neutron decay is a fundamental process in particle and nuclear physics. It is the prototype for nuclear beta decay and other semileptonic weak particle decays. Neutron decay played a key role in the formation of light elements in the early universe. The precise value of the neutron mean lifetime, about 15 min, has been the subject of many experiments over the past 70 years. The two main experimental methods, the beam method and the ultracold neutron storage method, give average values of the neutron lifetime that currently differ by 8.7 s (4 standard deviations), a serious discrepancy. Th

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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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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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Tan, Wanpeng. "Neutron oscillations for solving neutron lifetime and dark matter puzzles." Phys. Lett. B 797 (September 9, 2019): 134921. https://doi.org/10.1016/j.physletb.2019.134921.

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A model of n−n′ (neutron-mirror neutron) oscillations is proposed under the framework of the mirror matter theory with slightly broken mirror symmetry. It resolves the neutron lifetime discrepancy, i.e., the 1% difference in neutron lifetime between measurements from “beam” and “bottle” experiments. In consideration of the early universe evolution, the n−n′ mass difference is determined to be about 2×10<sup>−6</sup> eV/c<sup>2</sup> with the n−n′ mixing strength of about&nb

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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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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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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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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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Dau, Duc-Tu, Nhi-Dien Nguyen, Kien-Cuong Nguyen, et al. "Kinetic parameters of the Dalat nuclear research reactor with LEU fuel using MCNP6 and JENDL-5 library." Nuclear Technology and Radiation Protection 40, no. 1 (2025): 1–9. https://doi.org/10.2298/ntrp2501001d.

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Kinetic parameters of a nuclear reactor are essential in reactor dynamic and safety related characteristics. Kinetic parameters of the Dalat nuclear research reactor were evaluated using the MCNP6.3 code and a new nuclear data library (JENDL-5). Numerical calculations were performed for the core configuration consisting of 92 low-enriched uranium fuel bundles for obtaining the effective delayed neutron fraction beff, the neutron generation time L and the prompt neutron lifetime lp. Two methods were used to calculate the beff: the adjoint weighted method based on perturbation theory and adjoint

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Zhang, Liang, Bin Zhang, Cong Liu, and Yixue Chen. "Evaluation of PWR pressure vessel fast neutron fluence benchmarks from NUREG/CR-6115 with ares transport code." Nuclear Technology and Radiation Protection 32, no. 3 (2017): 204–10. http://dx.doi.org/10.2298/ntrp1703204z.

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An accurate evaluation of PWR pressure vessel fast neutron fluence is essential to ensure pressure vessel integrity over the design lifetime. The discrete ordinates method is one of the main methods to treat such problems. In this paper, evaluations have been performed for three PWR benchmarks described in NUREG/CR-6115 using ARES transport code. The calculated results were compared to the reference values and a satisfactory agreement was obtained. In addition, the effects of SN numeric and source distribution modeling for pressure vessel fast neutron fluence calculation are investigated. Base

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Rozprawy doktorskie na temat "Neutron lifetime discrepancy"

Le, joubioux Marius. "Search fοr a neutrοn dark decay in 6Ηe". Electronic Thesis or Diss., Normandie, 2024. http://www.theses.fr/2024NORMC223.

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L’écart entre les expériences dites du faisceau et de la bouteille mesurant la durée de vie du neutron libre pourrait être expliqué en considérant une nouvelle voie de désintégration du neutron en matière noire. Une telle décroissance pourrait être mis en lumière dans une sélection de noyaux radioactifs dans lesquels certains neutrons sont très faiblement liés au reste de la structure nucléaire. Dans le cas du noyau borroméen 6He, une décroissance en matière noire d’un des deux neutrons du halo produirait nécessairement les particules suivantes : 4He + n +x. Observer une émission de neutron co

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Streszczenia konferencji na temat "Neutron lifetime discrepancy"

Morris, Christopher. "Experimental search for an excited neutron state as an explanation of the beam-bottle neutron lifetime discrepancy." In Annual Meeting of the American Physical Society (APS) - Division of Nuclear Physics (DNP) ; 2024-10-07 - 2024-10-07. US DOE, 2024. http://dx.doi.org/10.2172/2460466.

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