Abstract
Theoretical models of β-delayed neutron emission are used as crucial inputs in r-process calculations. Benchmarking the predictions of these models is a challenge due to a lack of currently available experimental data. In this work the β-delayed neutron emission probabilities of 33 nuclides in the important mass regions south and south-west of 132Sn are presented, 16 for the first time. The measurements were performed at RIKEN using the Advanced Implantation Detector Array (AIDA) and the BRIKEN neutron detector array. The P1n values presented constrain the predictions of theoretical models in the region, affecting the final abundance distribution of the second r-process peak at A≈130.
Original language | English |
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Article number | 136266 |
Journal | Physics Letters B |
Volume | 816 |
DOIs | |
State | Published - May 10 2021 |
Funding
This experiment was performed at RI Beam Factory operated by RIKEN Nishina Center and CNS, University of Tokyo. O.H, T.D, P.J.W, C.G.B, C.J.G and D.K would like to thank STFC, UK for support. This research was sponsored in part by the Office of Nuclear Physics, U.S. Department of Energy under Award No. DE-FG02-96ER40983 (UTK) and DEAC05-00OR22725 (ORNL), and by the National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Award No. DENA0002132. This work was supported by National Science Foundation under Grants No. PHY-1430152 (JINA Center for the Evolution of the Elements), No. PHY-1565546 (NSCL), and No. PHY-1714153 (Central Michigan University). This work was supported by the Polish National Science Center under Contracts No. UMO-2015/18/E/ST2/00217, No. 2017/01/X/ST2/01144, No. 2019/33/N/ST2/03023 and No. 2020/36/T/ST2/00547. This work was also supported by JSPS KAKENHI (Grants No. 14F04808, No. 17H06090, No. 25247045, and No. 19340074). This work was also supported by Spanish Ministerio de Economía y Competitividad grants (FPA2011-06419, FPA2011-28770-C03-03, FPA2014-52823-C2-1-P, FPA2014-52823-C2-2-P, SEV-2014-0398, IJCI-2014-19172), by European Commission FP7/EURATOM Contract No. 605203, by the UK Science and Technology Facilities Council Grant No. ST/N00244X/1, by the National Research Foundation (NRF) in South Korea (No. 2016K1A3A7A09005575, No. 2015H1A2A1030275) and by the Natural Sciences and Engineering Research Council of Canada (NSERC) via the Discovery Grants SAPIN-2014-00028 and RGPAS 462257-2014. TRIUMF receives federal funding via a contribution agreement with the National Research Council Canada. This work was also supported by NKFIH (NN128072), and by the ÚNKP-20-5-DE-2 New National Excellence Program of the Ministry of Human Capacities of Hungary. G.G.K. acknowledges support from the Janos Bolyai research fellowship of the Hungarian Academy of Sciences. M.W.-C. acknowledges support from the Polish NCN project Miniatura No. 2017/01/X/ST2/01144. Z.L was supported by the National Key Research and Development Program of China (Contract No. 2018YFA0404402), the National Natural Science Foundation of China (Grants No. 11961141004, No. 11735017, No. 11675225 and No. 11635003) and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB34000000). M.R.M. performed this work under the auspice of the U.S. Department of Energy at Los Alamos National Laboratory. Los Alamos National Laboratory is operated by Triad National Security, LLC, for the National Nuclear Security Administration of U.S. Department of Energy (Contract No. 89233218CNA000001). This experiment was performed at RI Beam Factory operated by RIKEN Nishina Center and CNS, University of Tokyo. O.H, T.D, P.J.W, C.G.B, C.J.G and D.K would like to thank STFC , UK for support. This research was sponsored in part by the Office of Nuclear Physics, U.S. Department of Energy under Award No. DE-FG02-96ER40983 (UTK) and DEAC05-00OR22725 (ORNL), and by the National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Award No. DENA0002132 . This work was supported by National Science Foundation under Grants No. PHY-1430152 (JINA Center for the Evolution of the Elements), No. PHY-1565546 (NSCL), and No. PHY-1714153 (Central Michigan University). This work was supported by the Polish National Science Center under Contracts No. UMO-2015/18/E/ST2/00217 , No. 2017/01/X/ST2/01144 , No. 2019/33/N/ST2/03023 and No. 2020/36/T/ST2/00547 . This work was also supported by JSPS KAKENHI (Grants No. 14F04808 , No. 17H06090 , No. 25247045 , and No. 19340074 ). This work was also supported by Spanish Ministerio de Economía y Competitividad grants ( FPA2011-06419 , FPA2011-28770-C03-03 , FPA2014-52823-C2-1-P , FPA2014-52823-C2-2-P , SEV-2014-0398 , IJCI-2014-19172 ), by European Commission FP7/EURATOM Contract No. 605203 , by the UK Science and Technology Facilities Council Grant No. ST/N00244X/1 , by the National Research Foundation ( NRF ) in South Korea (No. 2016K1A3A7A09005575 , No. 2015H1A2A1030275 ) and by the Natural Sciences and Engineering Research Council of Canada (NSERC) via the Discovery Grants SAPIN-2014-00028 and RGPAS 462257-2014 . TRIUMF receives federal funding via a contribution agreement with the National Research Council Canada . This work was also supported by NKFIH ( NN128072 ), and by the ÚNKP-20-5-DE-2 New National Excellence Program of the Ministry of Human Capacities of Hungary. G.G.K. acknowledges support from the Janos Bolyai research fellowship of the Hungarian Academy of Sciences . M.W.-C. acknowledges support from the Polish NCN project Miniatura No. 2017/01/X/ST2/01144 . Z.L was supported by the National Key Research and Development Program of China (Contract No. 2018YFA0404402 ), the National Natural Science Foundation of China (Grants No. 11961141004 , No. 11735017 , No. 11675225 and No. 11635003 ) and the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No. XDB34000000 ). M.R.M. performed this work under the auspice of the U.S. Department of Energy at Los Alamos National Laboratory. Los Alamos National Laboratory is operated by Triad National Security, LLC, for the National Nuclear Security Administration of U.S. Department of Energy (Contract No. 89233218CNA000001 ).
Keywords
- r-process
- β-delayed neutron emission