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The s-process in the Nd-Pm-Sm region: Neutron activation of 147Pm

AuthorsGuerrero, C.; Tessler, M.; Paul, M.; Lerendegui-Marco, J.; Heinitz, S.; Maugeri, E. A.; Domingo Pardo, César ; Dressler, R.; Halfon, S.; Kivel, N.; Köster, U.; Palchan-Hazan, T.; Quesada, José Manuel; Schumann, D.; Weissman, L.
Neutron capture
Nuclear reactions
Neutron activation
Issue Date10-Oct-2019
CitationPhysics Letters B 797: 134809 (2019)
AbstractThe 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.
Publisher version (URL)http://dx.doi.org/10.1016/j.physletb.2019.134809
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