Stellar (n,gamma) cross sections of Hf174 and radioactive Hf182

Autor(en)

Christof Vockenhuber, I Dillmann, Michael Heil, Franz Käppeler, N Winckler, Walter Kutschera, Anton Wallner, Max Bichler, S Dababneh, Sara Bisterzo, Roberto Gallino

Abstrakt

The stellar neutron capture cross sections of Hf174 and the radioactive isotope Hf182 (t1/2=8.9×106 yr) have been measured for the first time at kT=25 keV by means of the activation technique. These isotopes originate from different stellar scenarios, Hf174 from the p-process by a series of photodisintegration reactions of heavier seed nuclei, and Hf182 from the s-process in asymptotic giant branch stars as well as from the r-process

in supernovae or neutron star mergers. Both activation measurements

were carried out at the Karlsruhe Van de Graaff accelerator using the Li7(p,n)Be7 reaction for simulating a Maxwellian neutron spectrum corresponding to a thermal energy of kT=25 keV. The Maxwellian averaged cross sections (MACS) extrapolated to the common s-process temperatures at kT=30 keV yield ⟨σ⟩30=983±46 and 141±8 mb for Hf174 and Hf182, respectively.

Organisation(en)

Isotopenphysik

Externe Organisation(en)

Karlsruher Institut für Technologie, Technische Universität Wien, Al-Balqa' Applied University, Istituto Nazionale di Fisica Nucleare (INFN), Roma

Journal

Physical Review C

Band

75

Anzahl der Seiten

14

ISSN

0556-2813

DOI

https://doi.org/10.1103/PhysRevC.75.015804

Publikationsdatum

2007

Peer-reviewed

Ja

ÖFOS 2012

103005 Atomphysik

Link zum Portal

https://ucris.univie.ac.at/portal/de/publications/stellar-ngamma-cross-sections-of-hf174-and-radioactive-hf182(78ebfa9a-5db6-4e04-9976-c52a5e1e2221).html