Ni 62 (n, γ) and Ni 63 (n, γ) cross sections measured at the n-TOF facility at CERN

Author(s)

C. Lederer, C. Massimi, E. Berthoumieux, N. Colonna, R. Dressler, C. Guerrero, F. Gunsing, F. Kaeppeler, N. Kivel, M. Pignatari, R. Reifarth, D. Schumann, A. Wallner, S. Altstadt, S. Andriamonje, J. Andrzejewski, L. Audouin, M. Barbagallo, V. Becares, F. Becvar, F. Belloni, B. Berthier, J. Billowes, V. Boccone, D. Bosnar, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, G. Cortes, M. A. Cortes-Giraldo, I. Dillmann, C. Domingo-Pardo, I. Duran, N. Dzysiuk, C. Eleftheriadis, M. Fernandez-Ordonez, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, M. B. Gomez-Hornillos, I. F. Goncalves, H. Leeb, Andreas Pavlik,

Abstract

The cross section of the Ni62(n,γ)

reaction was measured with the time-of-flight technique at the neutron

time-of-flight facility n_TOF at CERN. Capture kernels of 42 resonances

were analyzed up to 200 keV neutron energy and Maxwellian averaged cross

sections (MACS) from kT= 5–100 keV were calculated. With a total uncertainty of 4.5%, the stellar cross section is in excellent agreement with the the KADoNiS compilation at kT=30 keV, while being systematically lower up to a factor of 1.6 at higher stellar temperatures. The cross section of the Ni63(n,γ)

reaction was measured for the first time at n_TOF. We determined

unresolved cross sections from 10 to 270 keV with a systematic

uncertainty of 17%. These results provide fundamental constraints on s-process

production of heavier species, especially the production of Cu in

massive stars, which serve as the dominant source of Cu in the solar

system.

Organisation(s)

Isotope Physics

External organisation(s)

IRFU CEA-Saclay laboratory , Paul Scherrer Institute, Karlsruher Institut für Technologie, Johann Wolfgang Goethe-Universität Frankfurt am Main, University of Bologna, Istituto Nazionale di Fisica Nucleare (INFN), Roma, European Organization for Nuclear Research (CERN), Universität Basel, University of Lodz, Institut de Physique Nucléaire d'Orsay (IPN), Centro de Investigaciones Energeticas Medioambientales y Tecnológica, Charles University Prague, University of Manchester, University of Zagreb, Universitat Politècnica de Catalunya, Universidade Técnica de Lisboa, Universidad de Sevilla, Technische Universität München, GSI Helmholtzzentrum für Schwerionenforschung, Universidade de Santiago de Compostela (USC), Aristotle University of Thessaloniki, Bhabha Atomic Research Center, Instituto de Física Corpuscular (IFIC), Technische Universität Wien

Journal

Physical Review C

Volume

89

No. of pages

11

ISSN

0556-2813

DOI

https://doi.org/10.1103/PhysRevC.89.025810

Publication date

02-2014

Peer reviewed

Yes

Austrian Fields of Science 2012

103014 Nuclear physics

Keywords

ASJC Scopus subject areas

Nuclear and High Energy Physics

Portal url

https://ucris.univie.ac.at/portal/en/publications/ni-62-n--and-ni-63-n--cross-sections-measured-at-the-ntof-facility-at-cern(17b9adda-2727-4825-9f69-5aa4e9980990).html