Academic literature on the topic 'Neutrino ma'

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Journal articles on the topic "Neutrino ma"

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Giaré, William, Eleonora Di Valentino, Alessandro Melchiorri, and Olga Mena. "New cosmological bounds on hot relics: axions and neutrinos." Monthly Notices of the Royal Astronomical Society 505, no. 2 (2021): 2703–11. http://dx.doi.org/10.1093/mnras/stab1442.

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ABSTRACT Axions, if realized in nature, can be copiously produced in the early universe via thermal processes, contributing to the mass-energy density of thermal hot relics. In light of the most recent cosmological observations, we analyse two different thermal processes within a realistic mixed hot dark matter scenario which includes also massive neutrinos. Considering the axion–gluon thermalization channel, we derive our most constraining bounds on the hot relic masses ma < 7.46 eV and ∑mν < 0.114 eV both at 95 per cent CL; while studying the axion–pion scattering, without assu
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Vermeesch, Pieter, Martin Rittner, Irene Schimmelpfennig, Lucilla Benedetti, and ASTER Team. "Determining erosion rates in Allchar (Macedonia) to revive the lorandite neutrino experiment." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 474, no. 2213 (2018): 20170470. http://dx.doi.org/10.1098/rspa.2017.0470.

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205 Tl in the lorandite (TiAsS 2 ) mine of Allchar (Majdan, FYR Macedonia) is transformed to 205 Pb by cosmic ray reactions with muons and neutrinos. At depths of more than 300 m, muogenic production would be sufficiently low for the 4.3 Ma old lorandite deposit to be used as a natural neutrino detector. Unfortunately, the Allchar deposit currently sits at a depth of only 120 m below the surface, apparently making the lorandite experiment technically infeasible. We here present 25 erosion rate estimates for the Allchar area using in situ produced cosmogenic 36 Cl in carbonates and 10 Be in all
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Kitabayashi, Teruyuki, and Naoto Koizumi. "Remark on Majorana CP phases in neutrino mixing and leptogenesis." Modern Physics Letters A 29, no. 16 (2014): 1450087. http://dx.doi.org/10.1142/s0217732314500874.

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We estimate Majorana CP phases for a simple flavor neutrino mixing matrix which has been reported by Qu and Ma. Sizes of Majorana CP phases are evaluated in the study of the neutrinoless double beta decay and a particular leptogenesis scenario. We find the dependence of the physically relevant Majorana CP phase on the mass of lightest right-handed neutrino in the minimal seesaw model and the effective Majorana neutrino mass which is related with the half-life of the neutrinoless double beta decay.
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Forero, D. V. "Neutrino predictions in a modified Babu-Ma-Valle model." Journal of Physics: Conference Series 447 (July 24, 2013): 012042. http://dx.doi.org/10.1088/1742-6596/447/1/012042.

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LAVOURA, L., and H. KÜHBÖCK. "PREDICTIONS OF AN A4 MODEL WITH A FIVE-PARAMETER NEUTRINO MASS MATRIX." Modern Physics Letters A 22, no. 03 (2007): 181–89. http://dx.doi.org/10.1142/s0217732307022608.

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Winklehner, Daniel, Janet Conrad, Joseph Smolsky, Loyd Waites, and Philip Weigel. "New Commissioning Results of the MIST-1 Multicusp Ion Source." Journal of Physics: Conference Series 2244, no. 1 (2022): 012013. http://dx.doi.org/10.1088/1742-6596/2244/1/012013.

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Abstract For the sterile neutrino experiment IsoDAR (Isotope Decay-At-Rest), we have developed a compact particle accelerator system delivering a 10 mA, continuous wave (cw) proton beam at 60 MeV to a neutrino production target. The accelerator comprises a compact isochronous cyclotron, an RFQ embedded in the cyclotron yoke, and an ion source. To reduce space charge effects during injection and acceleration, we are accelerating H+ 2 instead of protons. To produce the needed cw H+ 2 beam current of 10 mA (nominal) at the required purity and quality, we have built a new filament driven, multicus
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OKADA, HIROSHI. "INVESTIGATIONS OF THE FLAVOR SYMMETRY, RADIATIVE SEESAW MODEL AND COLD DARK MATTER." International Journal of Modern Physics E 16, no. 05 (2007): 1541–56. http://dx.doi.org/10.1142/s0218301307006873.

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It is now clear that the masses of the neutrino sector are much lighter than those of the other three sectors. Canonial seesaw model would be the most famous for the above explanation. But one must introduce heavy particles that will not be able to observed with present scientific technologies. On the other hand, there are many attempts to explain the neutrino masses radiatively by means of inert Higgses, which do not have the vacuum expectation values. Then one can discuss cold dark matter candidates, because of no needing so heavy particles. The most famous work would be the Zee model17. Rec
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D'Eramo, Francesco, Eleonora Di Valentino, William Giarè, et al. "Cosmological bound on the QCD axion mass, redux." Journal of Cosmology and Astroparticle Physics 2022, no. 09 (2022): 022. http://dx.doi.org/10.1088/1475-7516/2022/09/022.

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Abstract We revisit the joint constraints in the mixed hot dark matter scenario in which both thermally produced QCD axions and relic neutrinos are present. Upon recomputing the cosmological axion abundance via recent advances in the literature, we improve the state-of-the-art analyses and provide updated bounds on axion and neutrino masses. By avoiding approximate methods, such as the instantaneous decoupling approximation, and limitations due to the limited validity of the perturbative approach in QCD that forced to artificially divide the constraints from the axion-pion and the axion-gluon
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MA, ERNEST. "SUPERSYMMETRIC A4×Z3 AND A4 REALIZATIONS OF NEUTRINO TRIBIMAXIMAL MIXING WITHOUT AND WITH CORRECTIONS." Modern Physics Letters A 22, no. 02 (2007): 101–6. http://dx.doi.org/10.1142/s0217732307022505.

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In an improved application of the tetrahedral symmetry A4 first introduced by Ma and Rajasekaran, supplemented by the discrete symmetry Z3 as well as supersymmetry, a two-parameter form of the neutrino mass matrix is derived which exhibits the tribimaximal mixing of Harrison, Perkins and Scott. This form is the same as the one obtained previously by Altarelli and Feruglio, and the inverse of that obtained by Babu and He. If only A4 is used, then corrections appear, making tan2 θ12 different from 0.5, without changing significantly sin22θ23 from one or θ13 from zero.
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Đặng, Thị Huyền Trân, та Thanh Phong Nguyễn. "Leptogenesis trong mô hình đối xứng S4 modular với cơ chế seesaw tối thiểu". CTU Journal of Science 61, № 3 (2025): 117–24. https://doi.org/10.22144/ctujos.2025.099.

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Mô hình đối xứng S4 modular được xây dựng với cơ chế seesaw tối thiểu nhằm làm giảm bớt số lượng các tham số tự do cũng như các hạt mới khi mở rộng Mô hình chuẩn. Mô hình nghiên cứu đã thỏa mãn tất cả các dữ liệu thực nghiệm khu vực lepton như khối lượng neutrino, các tham số của ma trận trộn lepton. Trên cơ sở đó, miền giá trị được phép của các tham số của mô hình cũng được xác định. Mô hình cũng giải thích thành công bất đối xứng giữa vật chất và phản vật chất của vũ trụ thông qua quá trình leptogenesis.
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Dissertations / Theses on the topic "Neutrino ma"

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Bouchand, Romain. "Radiative Neutrino Mass Generation and Renormalization Group Running in the Ma-Model." Thesis, KTH, Teoretisk partikelfysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-93672.

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PUIU, PAUL ANDREI. "Transition Edge Sensor Calorimeters for HOLMES." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2017. http://hdl.handle.net/10281/158143.

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I neutrini sono le particelle meno conosciute di tutto il modello standard. Da quando Pauli ha postulato la loro esistenza nella lettera 1930 sono stati compiuti molti progressi nello studio dei neutrini, ma tutt'ora ci sono delle caratteristiche fondamentali che non conosciamo: non sappiamo la scala di massa dei neutrini, e non sappiamo se sono particelle di Majorana o particelle di Dirac, infine, non abbiamo ancora risolto il problema della gerarchia. Negli ultimi due decenni, grazie alle misure degli esperimenti Super-Kamiokande, SNO, Daya Bay e Reno che hanno confermato l'oscillazione d
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BORGHESI, MATTEO. "Toward the first neutrino mass measurement of Holmes." Doctoral thesis, Università degli Studi di Milano-Bicocca, 2022. http://hdl.handle.net/10281/379056.

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Gli unici metodi per misurare la massa del neutrino che non siano dipendente dal modello teorico sono quelli basati sullo studio cinematico del decadimento beta o per cattura elettronica, poiché assumono solo la conservazioni di energia e momento. Holmes è un progetto ERC che è iniziato nel 2014 e che è portato avanti nei laboratori di criogenia dell’università di Milano-Bicocca. Il suo obiettivo è quello di effettuare una misura diretta della massa del neutrino con una sensibilità statistica dell’ordine dell’elettronvolt. Inoltre, proverà anche la fattibilità di questa tecnica per una futuro
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McKee, Erik Scott. "Neutron Production from Z-pinch Plasmas at the 1 MA Zebra Generator." Thesis, University of Nevada, Reno, 2017. http://pqdtopen.proquest.com/#viewpdf?dispub=10247687.

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<p> Neutrons produced deuterium Z-pinch plasmas are widely acknowledged to be a consequence of highly accelerated deuterons undergoing nuclear fusion with relatively stationary deuterons. The acceleration is thought to occur in intense fields created in the MHD instabilities that punctuate the plasma column. Interestingly, the energies of the accelerated ions exceed the applied voltage across the electrode gap. We use the 1 MA Zebra pulsed-power generator at the Nevada Terawatt Facility (NTF) to explore this poorly understood fast neutron production mechanism by creating deuterium Z-pinches in
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Zakova, Jitka. "Advanced fuels for thermal spectrum reactors." Doctoral thesis, KTH, Reaktorfysik, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-103085.

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The advanced fuels investigated in this thesis comprise fuels non− conventional in their design/form (TRISO), their composition (high content of plutonium and minor actinides) or their use in a reactor type, in which they have not been used before (e.g. nitride fuel in BWR). These fuels come with a promise of improved characteristics such as safe, high temperature operation, spent fuel transmutation or fuel cycle extension, for which reasons their potentialis worth assessment and investigation. Their possible use also brings about various challenges, out of which some were addressed in this th
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Book chapters on the topic "Neutrino ma"

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Zou, Chunyan, Chenggang Yu, Jun Zhou, et al. "Minor Actinides Transmutation in Thermal, Epithermal and Fast Molten Salt Reactors with Very Deep Burnup." In Springer Proceedings in Physics. Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_57.

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AbstractDeep burnup and high minor actinides (MA) loading are two alluring features for molten salt reactors (MSR) to incinerate the nuclear wastes. The transmutation capability of minor actinides in MSR is tightly related with the neutron spectrum, the loading of MA and the carrier salt compositions. In this work, three MSR core designs (thermal, epithermal and fast) and two types of salt compositions (Flibe and Flinak) with different solubility limits of transuranic elements are chosen for analyzing the transmutation capability of MA. With a significant mole fraction of MA loading (4% in the
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Pyeon, Cheol Ho. "Nuclear Transmutation of Minor Actinide." In Accelerator-Driven System at Kyoto University Critical Assembly. Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-0344-0_6.

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AbstractIntegral experiments on critical irradiation of neuptium-237 (237Np) and americium-241 (241Am) foils are carried out in a hard spectrum core at KUCA with the use of the back-to-back fission chamber, and Monte Carlo calculations together with a reference nuclear data library are conducted for confirming the precision of numerical simulations. Subcritical irradiation of minor actinide (MA) by ADS is a very important step, before operating actual ADS facilities, in a critical assembly at zero power, such as KUCA, which is an exclusive facility for ADS that comprises a uranium-235 (235U) f
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Tummers, Anna, Arie Wallert, Katja Kleinert, et al. "Case Study 1: Portrait of a Young Woman: Assessing New Technologies." In Cultural Heritage Science. Springer Nature Switzerland, 2024. https://doi.org/10.1007/978-3-031-59489-2_3.

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AbstractThis case study evaluates the respective use of five non-destructive techniques that are at our disposal to research the characteristic style and painting technique of Frans Hals. For this purpose, a typical Frans Hals portrait of around 1635, Portrait of a Woman in the Gemäldegalerie in Berlin, was researched using not only observations with the naked eye, x-rays (XR) and infrared reflectography (IRR), but also macro-x-ray fluorescence scans (MA-XRF), hyperspectral imaging also known as reflectance imaging spectroscopy (HI/RIS), and even neutron activated radiographs (NAR). As the por
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"Radiation protection calculations in the design of the AB- BNCT facility for the PNC-PNRR-ANTHEM Project." In Book of Abstracts - RAD 2025 Conference. RAD Centre, Niš, Serbia, 2025. https://doi.org/10.21175/rad.abstr.book.2025.37.12.

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In the framework of the PNC-PNRR ANTHEM project, a new Accelerator-Based Boron Neutron Capture Therapy (AB-BNCT) research and clinical facility will be built in Caserta, Italy. The ANTHEM clinical facility neutron production will be based on a Radio Frequency Quadrupole proton accelerator coupled with a beryllium target. Both the accelerator and the target are designed and manufactured by the Italian National Institute of Nuclear Physics (INFN). This machine delivers 5 MeV protons with a 30 mA current in continuous wave, producing at the target a neutron flux of the order of 1014 neutrons per
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"A novel accelerator-based setup for national scale 99Mo production: Radiation protection aspects." In Book of Abstracts - RAD 2025 Conference. RAD Centre, Niš, Serbia, 2025. https://doi.org/10.21175/rad.abstr.book.2025.26.1.

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The joint project 99MoBest is committed to develop an innovate production concept capable of meeting the entire German demand for the critical radionuclide 99Mo, which is currently approx. 60 TBq per week. Accelerator-based neutron sources offer ways to replace nuclear-reactor based production. In the construction phase, we already consider not only operative radiation protection aspects during irradiation and extraction, but also decommissioning and clearance aspects after the end of the facilities service life. These include minimization of long-lived nuclear waste and activation of structur
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AGUIAR SILVA, AURICELIA DE, and DIMAS DOS REIS RIBEIRO. "A PERCEPÇÃO DE ESTUDANTES E DOCENTES SOBRE A REPRESENTAÇÃO DE GÊNERO E SEXUALIDADE EM UMA ESCOLA PÚBLICA." In Gênero, sexualidade e educação (Vol.3). Editora Realize, 2025. http://dx.doi.org/10.46943/x.conedu.2024.gt07.007.

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A pesquisa trata-se de um estudo em nível de mestrado que aborda como a representação de gênero e sexualidade se desenvolve no ambiente escolar, focando na percepção do/a estudante e na concepção do/a docente diante dessa representação no meio escolar. O estudo foi desenvolvido em uma escola pública na cidade de Imperatriz, no estado do Maranhão. O objetivo geral consiste em analisar a percepção de estudantes e docentes sobre a representação de gênero e sexualidade em uma escola pública da cidade de Imperatriz/MA. Para tanto, os aportes teóricos que deram sustentação a essa investigação baseia
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Conference papers on the topic "Neutrino ma"

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Khorasanov, Georgy L., Anatoly P. Ivonov, and Anatoly I. Blokhin. "Neutronic and Physical Characteristics of an Accelerator Driven System with a Lead-208 Coolant." In 14th International Conference on Nuclear Engineering. ASMEDC, 2006. http://dx.doi.org/10.1115/icone14-89153.

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In the paper a possibility of using a lead isotope, pure Pb-208, as a coolant for a subcritical core of 80 MW thermal capacity of the PDS-XADS type facility is considered. Calculations of neutronic characteristics were performed using Monte Carlo technique. The following initial data were chosen: an annular core with a target, as a neutron source, at its centre; the core coolant — Pb-208 (100%); a fuel — a mix of mono nitrides of depleted uranium and power plutonium with a small share of neptunium and americium; the target coolant — a modified lead and bismuth eutectic, Pb-208(80%)-Bi(20%); pr
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Shimizu, Masaki, Hiroki Shishido, and Hidetoshi Hashizume. "Evaluation of the Applicability of Plutonium Transmuted From Minor Actinides by Fusion Reactor as Fertile Fuel in Boiling Water Reactor." In 2021 28th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2021. http://dx.doi.org/10.1115/icone28-65139.

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Abstract This study proposes to make effective use of plutonium transmuted from minor actinides (MA) by fusion reactors as fertile fuel in a light water reactor (LWR). The plutonium transmuted from MA, particularly Pu-238, has a large neutron capture cross section and becomes fissile Pu-239 by the reaction. If the plutonium transmuted from MA is loaded into LWR appropriately, there is a possibility to maintain a constant effective multiplication factor. This study evaluated the effects of the plutonium transmuted from MA on a full MOX boiled water reactor (BWR) core by Monte Carlo-based neutro
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Li, Xunzhao, Hongchun Wu, Liangzhi Cao, and Youqi Zheng. "A Neutronics Concept Design of Lead-Bismuth Cooled Accelerator-Driven System for Minor Actinide Transmutation." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-16309.

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Pursuing a high minor actinide (MA) transmutation rate, this paper proposes a neutronics concept design of lead-bismuth (LBE) cooled accelerator-driven system (ADS) with burnup reactivity swing less than 1% and proton beam current smaller than 17mA. After a comparison with other types of fuels, Uranium-free metallic dispersion fuel (TRU-10Zr)-Zr* is selected to obtain a harder neutron spectrum to transmute MA. With a MA initial loading, the suitable proportion of initial Plutonium to transuranium element (TRU) is found around 33% to make sure that the burnup reactivity swing is less than 1%. T
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Zhang, Wenxin, Haoyang Yu, Bin Liu, Jin Cai, and Shuangshuang Cui. "The Effect of Minor Actinide Transmutation on Temperature Coefficient in PWR." In 2017 25th International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/icone25-67649.

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Minor actinides in the spent fuel have strong radiotoxicity and very long half-life, the the properly dispose of spent fuel is indispensible to the development of nucler energy. Generally,we dispose the spent fuel by geological burying. But it can not compeletly solve the problem. Neutron transmutation is the only way to shorten the half-life of radioactive nuclides, under the irradiation of neutron MA nuclide will capture neutron or fission, and translate into the short lived nuclide or something valued nuclide. Reactivity temperature coefficient is an improtant safety parameter in nuclear re
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Altstadt, Eberhard, Carsten Beckert, Hartwig Freiesleben, et al. "Design of a Photoneutron Source for Time-of-Flight Experiments at the Radiation Source ELBE." In 12th International Conference on Nuclear Engineering. ASMEDC, 2004. http://dx.doi.org/10.1115/icone12-49456.

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The new radiation source ELBE at Research Center Rossendorf uses the high brilliance electron beam from a superconducting LINAC to produce various secondary beams. Electron beam intensities of up to 1 mA at energies between 12 MeV and 40 MeV can be delivered with a wide variability in the electron pulse structure. The maximum pulse frequency is 13 MHz with a pulse width less than 10 ps. The small emittance of the electron beam permits the irradiation of very small volumes. These main beam parameters led to the idea to convert the intense picosecond electron pulses into sub-ns neutron pulses by
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Xie, Jinsen, and Tao Yu. "Analysis of Isotopic Contributions to Doppler Coefficients of Inert Matrix Fuels." In 2014 22nd International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/icone22-30620.

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The Minor Actinides (MA) generated by nowadays PWRs fleet has significant impact on environment and biosphere. Inert Matrix Fuels (IMF) is a possible way to reduce the production and hazard of MA in recent. From neutronic aspect, using the MCNP code with temperature related continuous neutron data, the present paper analyses the isotopic contributions to the Doppler Coefficients of certain types IMF fuels. It is concluded that, the Doppler Coefficients of Al2O3+ZrO2+MgO and ZrO2 based IMF fuels are much smaller than those containing ThO2, since the low neutron absorptions and lacking of resona
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Normand, S., V. Kondrasovs, G. Corre, J. M. Bourbotte, and A. Ferragut. "MA-NRBC: First successful attempt for neutron gamma discrimination in plastic scintillators." In 2011 2nd International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications (ANIMMA). IEEE, 2011. http://dx.doi.org/10.1109/animma.2011.6172932.

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Reginato, L., W. Chu, J. Galvin, J. Kwan, and B. Ludwigt. "Conversion of the 2.5 MV Super HILAC injector power supply from 5 mA to 50 mA for boron neutron capture therapy." In Proceedings of the 1999 Particle Accelerator Conference (Cat. No.99CH36366). IEEE, 1999. http://dx.doi.org/10.1109/pac.1999.792759.

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Ouardi, A., R. Alami, A. Bensitel, A. Hommada, and A. Benchekroune. "Development of a neutron imaging facility at the CENM Al Maâmora TRIGA." In 2009 1st International Conference on Advancements in Nuclear Instrumentation, Measurement Methods and their Applications (ANIMMA). IEEE, 2009. http://dx.doi.org/10.1109/animma.2009.5503685.

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Ye, Bin, and Ayodeji A. Ala. "Neutronics Research on Annular Axial-Non-Uniform Minor Actinides Transmutation Targets in Commercial Pressurized Water Reactor." In 2024 31st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2024. http://dx.doi.org/10.1115/icone31-135114.

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Abstract This paper introduces the thermal-fast neutron conversion material 6LiD to improve the transmutation efficiency of MAs in commercial PWR, especially the fission rate, and investigate the feasibility of using annular axial-non-uniformly transmutation targets to flatten the axial power distribution of the core and optimize the temperature reactivity effect of the moderator at high boron concentration. In this research work, four annular axial-non-uniform transmutation targets are designed and they have the same geometry structure, but axially have different MA concentration in the trans
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Reports on the topic "Neutrino ma"

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Slutz, Stephen. Lasnex simulated neutron production rates of MagLIF driven by 17.5 MA. Office of Scientific and Technical Information (OSTI), 2018. http://dx.doi.org/10.2172/1761171.

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Dutra, Eric C., Matthew S. Wallace, Showera H. Haque, Zachary J. Wolff, Piotr P. Wiewior, and Daniel R. Lowe. Beam target neutron production using laser ablated deuterated polyethylene on a 1 MA, 100 ns z-pinch device. Office of Scientific and Technical Information (OSTI), 2025. https://doi.org/10.2172/2568956.

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