The s-process in the Nd-Pm-Sm region: Neutron activation of 147Pm
The Nd-Pm-Sm branching is of interest for the study of the s-process, related to the production of heavy elements in stars. As 148Sm and 150Sm are s-only isotopes, the understanding of the branching allows constraining the s-process neutron density. In this context the key physics input needed is th...
| Main Authors: | , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Elsevier
2019-10-01
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| Series: | Physics Letters B |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S0370269319305192 |
| _version_ | 1828392334481424384 |
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| author | C. Guerrero M. Tessler M. Paul J. Lerendegui-Marco S. Heinitz E.A. Maugeri C. Domingo-Pardo R. Dressler S. Halfon N. Kivel U. Köster T. Palchan-Hazan J.M. Quesada D. Schumann L. Weissman |
| author_facet | C. Guerrero M. Tessler M. Paul J. Lerendegui-Marco S. Heinitz E.A. Maugeri C. Domingo-Pardo R. Dressler S. Halfon N. Kivel U. Köster T. Palchan-Hazan J.M. Quesada D. Schumann L. Weissman |
| author_sort | C. Guerrero |
| collection | DOAJ |
| description | The Nd-Pm-Sm branching is of interest for the study of the s-process, related to the production of heavy elements in stars. As 148Sm and 150Sm are s-only isotopes, the understanding of the branching allows constraining the s-process neutron density. In this context the key physics input needed is the cross section of the three unstable nuclides in the region: 147Nd (10.98 d half-life), 147Pm (2.62 yr) and 148Pm (5.37 d). This paper reports on the activation measurement of 147Pm, the longest-lived of the three nuclides. The cross section measurement has been carried out by activation at the SARAF LiLiT facility using a 56(2) μg target. Compared to the single previous measurement of 147Pm, the measurement presented herein benefits from a target 2000 times more massive. The resulting Maxwellian Averaged Cross Section (MACS) to the ground and metastable states in 148Pm are 469(50) mb and 357(27) mb. These values are 41% higher (to the ground state) and 15% lower (to the metastable state) than the values reported so far, leading however to a total cross section of 826(107) mb consistent within uncertainties with the previous result and hence leaving unchanged the previous calculation of the s-process neutron density. Keywords: Nucleosynthesis, Neutron capture, Nuclear reactions, s-process, MACS, Neutron activation |
| first_indexed | 2024-12-10T07:19:05Z |
| format | Article |
| id | doaj.art-538d78a37ad149c8a4268948791d6432 |
| institution | Directory Open Access Journal |
| issn | 0370-2693 |
| language | English |
| last_indexed | 2024-12-10T07:19:05Z |
| publishDate | 2019-10-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Physics Letters B |
| spelling | doaj.art-538d78a37ad149c8a4268948791d64322022-12-22T01:57:52ZengElsevierPhysics Letters B0370-26932019-10-01797The s-process in the Nd-Pm-Sm region: Neutron activation of 147PmC. Guerrero0M. Tessler1M. Paul2J. Lerendegui-Marco3S. Heinitz4E.A. Maugeri5C. Domingo-Pardo6R. Dressler7S. Halfon8N. Kivel9U. Köster10T. Palchan-Hazan11J.M. Quesada12D. Schumann13L. Weissman14Universidad de Sevilla, Seville, Spain; Centro Nacional de Aceleradores (Universidad de Sevilla-CSIC-Junta de Andalucía), Seville, Spain; Corresponding author at: Facultad de Física, Universidad de Sevilla, Av. Reina Mercedes s/n, 41012 Sevilla, Spain.Hebrew University, Jerusalem, Israel; Soreq Nuclear Research Center (SNRC), Yavne, IsraelHebrew University, Jerusalem, IsraelUniversidad de Sevilla, Seville, SpainPaul Scherrer Institut (PSI), Villigen, SwitzerlandPaul Scherrer Institut (PSI), Villigen, SwitzerlandInstituto de Física Corpuscular (CSIC-Universidad de Valencia), Valencia, SpainPaul Scherrer Institut (PSI), Villigen, SwitzerlandSoreq Nuclear Research Center (SNRC), Yavne, IsraelPaul Scherrer Institut (PSI), Villigen, SwitzerlandInstitut Laue-Langevin (ILL), Grenoble, FranceHebrew University, Jerusalem, IsraelUniversidad de Sevilla, Seville, SpainPaul Scherrer Institut (PSI), Villigen, SwitzerlandSoreq Nuclear Research Center (SNRC), Yavne, IsraelThe Nd-Pm-Sm branching is of interest for the study of the s-process, related to the production of heavy elements in stars. As 148Sm and 150Sm are s-only isotopes, the understanding of the branching allows constraining the s-process neutron density. In this context the key physics input needed is the cross section of the three unstable nuclides in the region: 147Nd (10.98 d half-life), 147Pm (2.62 yr) and 148Pm (5.37 d). This paper reports on the activation measurement of 147Pm, the longest-lived of the three nuclides. The cross section measurement has been carried out by activation at the SARAF LiLiT facility using a 56(2) μg target. Compared to the single previous measurement of 147Pm, the measurement presented herein benefits from a target 2000 times more massive. The resulting Maxwellian Averaged Cross Section (MACS) to the ground and metastable states in 148Pm are 469(50) mb and 357(27) mb. These values are 41% higher (to the ground state) and 15% lower (to the metastable state) than the values reported so far, leading however to a total cross section of 826(107) mb consistent within uncertainties with the previous result and hence leaving unchanged the previous calculation of the s-process neutron density. Keywords: Nucleosynthesis, Neutron capture, Nuclear reactions, s-process, MACS, Neutron activationhttp://www.sciencedirect.com/science/article/pii/S0370269319305192 |
| spellingShingle | C. Guerrero M. Tessler M. Paul J. Lerendegui-Marco S. Heinitz E.A. Maugeri C. Domingo-Pardo R. Dressler S. Halfon N. Kivel U. Köster T. Palchan-Hazan J.M. Quesada D. Schumann L. Weissman The s-process in the Nd-Pm-Sm region: Neutron activation of 147Pm Physics Letters B |
| title | The s-process in the Nd-Pm-Sm region: Neutron activation of 147Pm |
| title_full | The s-process in the Nd-Pm-Sm region: Neutron activation of 147Pm |
| title_fullStr | The s-process in the Nd-Pm-Sm region: Neutron activation of 147Pm |
| title_full_unstemmed | The s-process in the Nd-Pm-Sm region: Neutron activation of 147Pm |
| title_short | The s-process in the Nd-Pm-Sm region: Neutron activation of 147Pm |
| title_sort | s process in the nd pm sm region neutron activation of 147pm |
| url | http://www.sciencedirect.com/science/article/pii/S0370269319305192 |
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