Experimental neutron capture data of Ni-58 from the CERN n_TOF facility

Autor(en)

P. Zugec, M. Barbagallo, N. Colonna, D. Bosnar, S. Altstadt, J. Andrzejewski, L. Audouin, V. Becares, F. Becvar, F. Belloni, E. Berthoumieux, J. Billowes, V. Boccone, M. Brugger, M. Calviani, F. Calvino, D. Cano-Ott, C. Carrapico, F. Cerutti, E. Chiaveri, M. Chin, G. Cortes, M. A. Cortes-Giraldo, M. Diakaki, C. Domingo-Pardo, I. Duran, N. Dzysiuk, C. Eleftheriadis, A. Ferrari, K. Fraval, S. Ganesan, A. R. Garcia, G. Giubrone, M. B. Gomez-Hornillos, I. F. Goncalves, E. Gonzalez-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, D. G. Jenkins, E. Jericha, Y. Kadi, F. Kaeppeler, D. Karadimos, P. Koehler, M. Kokkoris, C. Lederer, A. Pavlik, A. Wallner,

Abstrakt

The 58Ni(n,γ)

cross section has been measured at the neutron time of flight facility

n_TOF at CERN, in the energy range from 27 meV up to 400 keV. In total,

51 resonances have been analyzed up to 122 keV. Maxwellian averaged

cross sections (MACS) have been calculated for stellar temperatures of kT=5–100 keV with uncertainties of less than 6%, showing fair agreement with recent experimental and evaluated data up to kT = 50 keV. The MACS extracted in the present work at 30 keV is 34.2±0.6stat±1.8sys

mb, in agreement with latest results and evaluations, but 12% lower

relative to the recent KADoNIS compilation of astrophysical cross

sections. When included in models of the s-process nucleosynthesis in massive stars, this change results in a 60% increase of the abundance of 58Ni, with a negligible propagation on heavier isotopes. The reason is that, using both the old or the new MACS, 58Ni is efficiently depleted by neutron captures.

Organisation(en)

Isotopenphysik

Externe Organisation(en)

University of Zagreb, French Alternative Energies and Atomic Energy Commission (CEA), Bhabha Atomic Research Center, Karlsruher Institut für Technologie, University of Oslo (UiO), Istituto Nazionale di Fisica Nucleare (INFN), Roma, Johann Wolfgang Goethe-Universität Frankfurt am Main, University of Lodz, Centre National De La Recherche Scientifique (CNRS), Centro de Investigaciones Energeticas Medioambientales y Tecnológica, Charles University Prague, European Organization for Nuclear Research (CERN), University of Manchester, Universitat Politècnica de Catalunya, Universidade de Lisboa, Universidad de Sevilla, National Technical University of Athens (NTUA), Instituto de Física Corpuscular (IFIC), Universidade de Santiago de Compostela (USC), Aristotle University of Thessaloniki, Technische Universität Wien, University of York

Journal

Physical Review C

Band

89

Anzahl der Seiten

9

ISSN

0556-2813

DOI

https://doi.org/10.1103/PhysRevC.89.014605

Publikationsdatum

01-2014

Peer-reviewed

Ja

ÖFOS 2012

103014 Kernphysik

Schlagwörter

ASJC Scopus Sachgebiete

Nuclear and High Energy Physics

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/experimental-neutron-capture-data-of-ni58-from-the-cern-ntof-facility(9d57ac7a-4ab5-487f-88ee-a1a9913204f3).html