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First Results of the $^{140}$Ce(n,γ)$^{141}$Ce Cross-Section Measurement at n_TOF

n_TOF Collaboration; Amaducci, Simone; Colonna, Nicola; Cosentino, Luigi; Cristallo, Sergio; Finocchiaro, Paolo; Krtička, Milan; Massimi, Cristian; Mastromarco, Mario; Mazzone, Annamaria; Mengoni, Alberto; Valenta, Stanislav; Aberle, Oliver; Alcayne, Victor; Andrzejewski, Józef; Audouin, Laurent; Babiano-Suarez, Victor; Bacak, Michael; Barbagallo, Massimo; ... mehr

An accurate measurement of the $^{140}$Ce(n,γ) energy-dependent cross-section was performed at the n_TOF facility at CERN. This cross-section is of great importance because it represents a bottleneck for the s-process nucleosynthesis and determines to a large extent the cerium abundance in stars. The measurement was motivated by the significant difference between the cerium abundance measured in globular clusters and the value predicted by theoretical stellar models. This discrepancy can be ascribed to an overestimation of the $^{140}$Ce capture cross-section due to a lack of accurate nuclear data. For this measurement, we used a sample of cerium oxide enriched in $^{140}$Ce to 99.4%. The experimental apparatus consisted of four deuterated benzene liquid scintillator detectors, which allowed us to overcome the difficulties present in the previous measurements, thanks to their very low neutron sensitivity. The accurate analysis of the p-wave resonances and the calculation of their average parameters are fundamental to improve the evaluation of the $^{140}$Ce Maxwellian-averaged cross-section.

Verlagsausgabe §
DOI: 10.5445/IR/1000135444
Veröffentlicht am 16.07.2021
DOI: 10.3390/universe7060200
Zitationen: 2
Web of Science
Zitationen: 2
Zitationen: 2
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Kernphysik (IKP)
Zukunftscampus (CAMPUS)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 2218-1997
KITopen-ID: 1000135444
HGF-Programm 51.13.04 (POF IV, LK 01) Kosmische Strahlung Technologien
Erschienen in Universe
Verlag MDPI
Band 7
Heft 6
Seiten Art.Nr. 200
Vorab online veröffentlicht am 17.06.2021
Schlagwörter cerium; $^{140}$Ce; neutron; capture; cross-section; s-process; n_TOF; MACS; nucleosynthesis
Nachgewiesen in Web of Science
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