Artículo
The s-process in the Nd-Pm-Sm region: Neutron activation of 147Pm
Autor/es | Guerrero Sánchez, Carlos
Tessler, Moshe Paul, Michael C. Lerendegui Marco, Jorge Heinitz, Stephan Maugeri, Emilio Andrea Quesada Molina, José Manuel Weissman, Leonid |
Departamento | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear |
Fecha de publicación | 2019 |
Fecha de depósito | 2020-05-20 |
Publicado en |
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Resumen | 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 ... 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. |
Agencias financiadoras | Universidad de Sevilla |
Identificador del proyecto | FPA2013-45083P
FPA2014-53290-C2-2-P FPA2016-77689-C2-1-R |
Cita | Guerrero Sánchez, C., Tessler, M., Paul, M.C., Lerendegui Marco, J., Heinitz, S., Maugeri, E.A.,...,Weissman, L. (2019). The s-process in the Nd-Pm-Sm region: Neutron activation of 147Pm. Physics Letters B, 797. |
Ficheros | Tamaño | Formato | Ver | Descripción |
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The s-process.pdf | 855.1Kb | [PDF] | Ver/ | |
1-s2.0-S0370269320300721-main.pdf | 119.1Kb | [PDF] | Ver/ | Corrigendum |