%0 Journal Article
%T The s-process in the Nd-Pm-Sm region: Neutron activation of Pm-147
%A Guerrero, C.
%A Tessler, M.
%A Paul, M.
%A Lerendegui-Marco, J.
%A Heinitz, S.
%A Maugeri, E. A.
%A Domingo-Pardo, C.
%A Dressler, R.
%A Halfon, S.
%A Kivel, N.
%A Koster, U.
%A Palchan-Hazan, T.
%A Quesada, J. M.
%A Schumann, D.
%A Weissman, L.
%J Physics Letters B
%D 2019
%V 797
%I Elsevier
%@ 0370-2693
%G English
%F Guerrero_etal2019
%O WOS:000488071200026
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=4161), last updated on Tue, 22 Oct 2019 16:22:06 +0000
%X 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 Sm-148 and Sm-150 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: Nd-147 (10.98 d half-life), Pm-147 (2.62 yr) and Pm-148 (5.37 d). This paper reports on the activation measurement of Pm-147, 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 Pm-147, 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 Pm-148 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.
%K Nucleosynthesis
%K Neutron capture
%K Nuclear reactions
%K s-process
%K MACS
%K Neutron activation
%R 10.1016/j.physletb.2019.134809
%U https://doi.org/10.1016/j.physletb.2019.134809
%P 134809-6pp