TY  - JOUR
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  - Koster, U.
AU  - Palchan-Hazan, T.
AU  - Quesada, J. M.
AU  - Schumann, D.
AU  - Weissman, L.
PY  - 2019
DA  - 2019//
TI  - The s-process in the Nd-Pm-Sm region: Neutron activation of Pm-147
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 134809
EP  - 6pp
VL  - 797
PB  - Elsevier
KW  - Nucleosynthesis
KW  - Neutron capture
KW  - Nuclear reactions
KW  - s-process
KW  - MACS
KW  - Neutron activation
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 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.
SN  - 0370-2693
UR  - https://doi.org/10.1016/j.physletb.2019.134809
DO  - 10.1016/j.physletb.2019.134809
LA  - English
N1  - WOS:000488071200026
ID  - Guerrero_etal2019
ER  -