Abstract
Neutron-rich lanthanides were produced via in-flight fission of a 238U primary beam at the RIBF, RIKEN Nishina Center to measure half-lives (T1/2) and beta-delayed neutron emission probabilities (Pn) in order to constrain r-process abundance calculations. 159–166Pm, 161–168Sm, 165–170Eu, and 167–172Gd ions were implanted in the Advanced Implantation Detector Array (AIDA), and β-delayed neutrons and γ-rays were detected by the surrounding detector array (BRIKEN). For the validation of T1/2 values derived from implantation–β (i–β) time correlations, γ-spectroscopic methods were used as well. The experimental results of the β-delayed γ-spectroscopy of 162Pm are presented here as an example. A half-life value from γ-decay curves was derived with a comparable uncertainty to the result from the i–β method, and a mean value well within the 1σ range.
| Original language | English |
|---|---|
| Article number | 4-A8 |
| Journal | Acta Physica Polonica B, Proceedings Supplement |
| Volume | 14 |
| Issue number | 6 |
| DOIs | |
| State | Published - 2023 |
Funding
This work was supported by NKFIH (NN128072) and by the ÚNKP-22-2 New National Excellence Program of the Ministry for Culture and Innovation from the source of the National Research, Development and Innovation Fund (project number: ÚNKP-22-2-I-DE-75). Y.S., I.D., R.C.F., and C.J.G. acknowledge funding from the Canadian Natural Sciences and Engineering Research Council (NSERC): SAPIN-2019-00030; Canadian Natural Sciences and Engineering Research Council (NSERC): SAPPJ-2017-00026. This work was supported by the National Science Foundation (NSF) under grant No. PHY-1714153 (A.E., N.N.), by JSPS KAKENHI (grants No. 17H06090 and 20H05648), and the RIKEN program for the Evolution of Matter in the Universe (r-EMU). P.J.C.S., T.D., O.H., L.J.H.B., D.K., L.B., and P.J.W. acknowledge the support of the UK Science and Technology Facilities Council (STFC). This research was sponsored in part by the Office of Nuclear Physics, U.S. Department of Energy (DOE) under Awards No. DE-FG02-96ER40983 (UTK) and DE-AC05-00OR22725 (ORNL), and by the National Nuclear Security Administration (NNSA) under the Stewardship Science Academic Alliances program through DOE Award No. DE-NA0002132. This work was supported by the U.S. National Science Foundation Award PHY-1714153. This work has been supported by the Spanish Ministerio de Economía y Competitividad under grants No. FPA2014-52823-C2-1-P, FPA2014-52823-C2-2-P, FPA2017-83946-C2-1-P, FPA2017-83946-C2-2-P, and grants from Ministerio de Ciencia e Innovacion Nos. PID2019-104714GB-C21 and PID2019-104714GB-C22. A.A. acknowledges partial support of the JSPS Invitational Fellowships for Research in Japan (ID: L1955). M.P.-S. received funding from the National Science Centre, Poland (NCN) under grants No. 2019/33/N/ST2/03023 and 2020/36/T/ST2/00547. A.K. was partially funded by grant No. 2020/39/B/ST2/02346. Y.S. would like to thank Nicole Vassh (Uni. of Notre Dame/TRIUMF) for providing the neutron-star merger trajectory and the initial abundance distributions. This research was enabled in part by computing resources provided by West-Grid (www.westgrid.ca) and Compute Canada (www.computecanada.ca). F.M. acknowledges the support of ANID/FONDECYT Regular 1171467 and ANID/FONDECYT Regular 1221364 national projects. Supported by Gen-eralitat Valenciana and FEDER funds under grant PROMETEO/2019/007.