Impact of Newly Measured <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>-Delayed Neutron Emitters around <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:

Neutron emission probabilities and half-lives of 37 β-delayed neutron emitters from ^{75}Ni to ^{92}Br were measured at the RIKEN Nishina Center in Japan, including 11 one-neutron and 13 two-neutron emission probabilities and six half-lives for the first time that supersede theoretical estimates. These nuclei lie in the path of the weak r process occurring in neutrino-driven winds from the accretion disk formed after the merger of two neutron stars synthesizing elements in the A∼80 abundance peak. The presence of such elements dominates the accompanying kilonova emission over the first few days and have been identified in the AT2017gfo event, associated to the gravitational wave detection GW170817. Abundance calculations based on over 17 000 simulated trajectories describing the evolution of matter properties in the merger outflows show that the new data lead to an increase of 50%-70% in the abundance of Y, Zr, Nb, and Mo. This enhancement is large compared to the scatter of relative abundances observed in old very metal poor stars and thus is significant in the comparison with other possible astrophysical processes contributing to the light-element production. These results underline the importance of including experimental decay data for very neutron-rich β-delayed neutron emitters into r-process models.

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Publication Details

Journal
Physical Review Letters
Published
2025-05-01
DOI
https://doi.org/10.1103/physrevlett.134.172701
Citations
3
Primary Topic
Gamma-ray bursts and supernovae
Type
article
Field-Weighted Citation Impact
3.46

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article

Impact of Newly Measured <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>-Delayed Neutron Emitters around <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:

S. Nishimura, F. Calviño, S. Go, B. C. Rasco et al.
3 citations
Physical Review Letters
Gamma-ray bursts and supernovae
3.46
article

Impact of Newly Measured <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>β</mml:mi></mml:math>-Delayed Neutron Emitters around <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:

S. Nishimura, F. Calviño, S. Go, B. C. Rasco, T. Isobe, L. J. Harkness-Brennan, S. Kubono, T. Davinson, A. Algora, R. Caballero-Folch, S. Bae, M. Karny, V. Pucknell, P. J. Coleman-Smith, A. I. Morales, F. Montes, G. Cortés, D. Kahl, D. S. Ahn, O. Hall, J. Ha, Marius Eichler, R. Grzywacz, A. Korgul, I. Dillmann, C. J. Griffin, J. Lee, M. Wolińska-Cichocka, B. Rubio, Almudena Arcones, A. Tarifeño-Saldivia, H. Baba, Rebecca Surman, R. Yokoyama, T. Sumikama, J. Simpson, L. H. Khiem, P. H. Regan, A. Tolosa-Delgado, K. Miernik, Moritz Reichert, Y. Shimizu, C. Domingo‐Pardo, A. Estradé, H. Takeda, X. X. Xu, M. Takechi, M. Labiche, P.-A. Söderström, J. L. Taı́n, Kazunori Matsui, G. Lorusso, C. G. Bruno, R. D. Page, N. Nepal, N. T. Brewer, J. Liu, M. Piersa-Siłkowska, D. W. Stracener, H. Sakuraï, V. H. Phong, H. Suzuki, B. Moon, I. Lazarus, Y. Saito, N. Fukuda, K. P. Rykaczewski, S.L. Thomas, J. Agramunt, G. G. Kiss, J. F. Liang, Zs. Podolyák, P. J. Woods, M. Kogimtzis
article en
3 citations

Abstract

Neutron emission probabilities and half-lives of 37 β-delayed neutron emitters from ^{75}Ni to ^{92}Br were measured at the RIKEN Nishina Center in Japan, including 11 one-neutron and 13 two-neutron emission probabilities and six half-lives for the first time that supersede theoretical estimates. These nuclei lie in the path of the weak r process occurring in neutrino-driven winds from the accretion disk formed after the merger of two neutron stars synthesizing elements in the A∼80 abundance peak. The presence of such elements dominates the accompanying kilonova emission over the first few days and have been identified in the AT2017gfo event, associated to the gravitational wave detection GW170817. Abundance calculations based on over 17 000 simulated trajectories describing the evolution of matter properties in the merger outflows show that the new data lead to an increase of 50%-70% in the abundance of Y, Zr, Nb, and Mo. This enhancement is large compared to the scatter of relative abundances observed in old very metal poor stars and thus is significant in the comparison with other possible astrophysical processes contributing to the light-element production. These results underline the importance of including experimental decay data for very neutron-rich β-delayed neutron emitters into r-process models.

Physical Review LettersVol. 134(17)
University of Notre Dame (US), Rutherford Appleton Laboratory (GB), Oak Ridge National Laboratory (US), National Physical Laboratory (GB), Seoul National University (KR), University of Liverpool (GB), Universitat de València (ES), Central Michigan University (US), GSI Helmholtz Centre for Heavy Ion Research (DE), University of Victoria (CA), Daresbury Laboratory (GB), University of Surrey (GB), Technische Universität Darmstadt (DE), National Superconducting Cyclotron Laboratory (US), Instituto de Física Corpuscular (ES), Institute for Basic Science (KR), Extreme Light Infrastructure - Nuclear Physics (RO), Max Planck Institute for Nuclear Physics (DE), RIKEN Nishina Center (JP), University of Warsaw (PL), European Organization for Nuclear Research (CH), VNU University of Science (VN), Niigata University (JP), The University of Tokyo (JP), University of Tennessee at Knoxville (US), University of Hong Kong (HK), University of Jyväskylä (FI), Universitat Politècnica de Catalunya (ES), McMaster University (CA), University of Edinburgh (GB)
U.S. Department of Energy, Ministerio de Ciencia, Innovación y Universidades, Ministerul Cercetării, Inovării şi Digitalizării, European Commission, National Research Foundation, Deutsche Forschungsgemeinschaft, Academy of Finland, Ministerio de Economía y Competitividad, Generalitat Valenciana, National Research Foundation of Korea, Ministerio de Ciencia e Innovación, Institute for Basic Science, Nemzeti Kutatási Fejlesztési és Innovációs Hivatal, Natural Sciences and Engineering Research Council of Canada, Science and Technology Facilities Council, Japan Society for the Promotion of Science, RIKEN, European Regional Development Fund, Agencia Estatal de Investigación, High Energy Physics, Nuclear Physics, European Social Fund, Oak Ridge National Laboratory
Openalex Percentile: Top 8%
Gamma-ray bursts and supernovae
3.46
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