Publications
Stellar (n,gamma) cross sections of Hf174 and radioactive Hf182
- Author(s)
- Christof Vockenhuber, I Dillmann, Michael Heil, Franz Käppeler, N Winckler, Walter Kutschera, Anton Wallner, Max Bichler, S Dababneh, Sara Bisterzo, Roberto Gallino
- Abstract
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(s)
- Isotope Physics
- External organisation(s)
- Karlsruher Institut für Technologie, Technische Universität Wien, Al-Balqa' Applied University, Istituto Nazionale di Fisica Nucleare (INFN), Roma
- Journal
- Physical Review C
- Volume
- 75
- No. of pages
- 14
- ISSN
- 0556-2813
- DOI
- https://doi.org/10.1103/PhysRevC.75.015804
- Publication date
- 2007
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103005 Atomic physics
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/78ebfa9a-5db6-4e04-9976-c52a5e1e2221