TY - JOUR
T1 - The s-process in the Nd-Pm-Sm region
T2 - Neutron activation of 147Pm
AU - Guerrero, C.
AU - Tessler, M.
AU - Paul, M.
AU - Lerendegui-Marco, J.
AU - Heinitz, S.
AU - Maugeri, E. A.
AU - Domingo-Pardo, C.
AU - Dressler, R.
AU - Halfon, S.
AU - Kivel, N.
AU - Köster, U.
AU - Palchan-Hazan, T.
AU - Quesada, J. M.
AU - Schumann, D.
AU - Weissman, L.
N1 - Publisher Copyright:
© 2019
PY - 2019/10/10
Y1 - 2019/10/10
N2 - 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.
AB - 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.
KW - MACS
KW - Neutron activation
KW - Neutron capture
KW - Nuclear reactions
KW - Nucleosynthesis
KW - s-process
UR - http://www.scopus.com/inward/record.url?scp=85071271052&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2019.134809
DO - 10.1016/j.physletb.2019.134809
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AN - SCOPUS:85071271052
SN - 0370-2693
VL - 797
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
M1 - 134809
ER -