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Neutron Capture on the s-Process Branching Point $^{171}$Tm via Time-of-Flight and Activation

Guerrero, C.; Lerendegui-Marco, J.; Paul, M.; Tessler, M.; Heinitz, S.; Domingo-Pardo, C.; Cristallo, S.; Dressler, R.; Halfon, S.; Kivel, N.; Köster, U.; Maugeri, E. A.; Palchan-Hazan, T.; Quesada, J. M.; Rochman, D.; Schumann, D.; Weissman, L.; Aberle, O.; Amaducci, S.; ... mehr

The neutron capture cross sections of several unstable nuclides acting as branching points in the s process are crucial for stellar nucleosynthesis studies. The unstable $^{171}$Tm(t$_{1/2}$=1.92 yr) is part of the branching around mass A∼170 but its neutron capture cross section as a function of the neutron energy is not known to date. In this work, following the production for the first time of more than 5 mg of $^{171}$Tm at the high-flux reactor Institut Laue-Langevin in France, a sample was produced at the Paul Scherrer Institute in Switzerland. Two complementary experiments were carried out at the neutron time-of-flight facility (n_TOF) at CERN in Switzerland and at the SARAF liquid lithium target facility at Soreq Nuclear Research Center in Israel by time of flight and activation, respectively. The result of the time-of-flight experiment consists of the first ever set of resonance parameters and the corresponding average resonance parameters, allowing us to make an estimation of the Maxwellian-averaged cross sections (MACS) by extrapolation. The activation measurement provides a direct and more precise measurement of the MACS at 30 keV: 384(40) mb, with which the estimation from the n_TOF data agree at the limit of 1 standard deviation. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000129917
Veröffentlicht am 19.02.2021
DOI: 10.1103/PhysRevLett.125.142701
Zitationen: 8
Web of Science
Zitationen: 6
Zitationen: 9
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Astroteilchenphysik (IAP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2020
Sprache Englisch
Identifikator ISSN: 0031-9007, 1079-7114
KITopen-ID: 1000129917
HGF-Programm 51.03.04 (POF III, LK 01) Kosmische Strahlung Technologien
Erschienen in Physical review letters
Verlag American Physical Society (APS)
Band 125
Heft 14
Seiten Art.-Nr.: 142701
Vorab online veröffentlicht am 02.10.2020
Nachgewiesen in Scopus
Web of Science
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