Stellar ($n,\ensuremath{\gamma}$) cross sections of $^{174}\mathrm{Hf}$ and radioactive $^{182}\mathrm{Hf}$

Stellar ( $n, γ$ ) cross sections of ${}^{174}{Hf}$ and radioactive ${}^{182}{Hf}$

C. Vockenhuber, I. Dillmann, M. Heil, F. Käppeler, N. Winckler, W. Kutschera, A. Wallner, M. Bichler, S. Dababneh, S. Bisterzo, and R. Gallino

Phys. Rev. C 75, 015804 – Published 12 January 2007

Abstract

The stellar neutron capture cross sections of ${}^{174}{Hf}$ and the radioactive isotope ${}^{182}{Hf}$ ( $t_{1 / 2} = 8.9 \times 10^{6}$ 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, ${}^{174}{Hf}$ from the $p$ -process by a series of photodisintegration reactions of heavier seed nuclei, and ${}^{182}{Hf}$ 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 ${}^{7}{Li}$ ( $p, n$ ) ${}^{7}{Be}$ 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 $〈 σ 〉_{30} = 983 \pm 46$ and $141 \pm 8$ mb for ${}^{174}{Hf}$ and ${}^{182}{Hf}$ , respectively.

Received 18 August 2006

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

Authors & Affiliations

C. Vockenhuber^*

TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3

I. Dillmann^†, M. Heil, F. Käppeler, and N. Winckler

Institut für Kernphysik, Forschungszentrum Karlsruhe, Postfach 3640, D-76021 Karlsruhe, Germany

W. Kutschera and A. Wallner

Vienna Environmental Research Accelerator (VERA), Institut für Isotopenforschung und Kernphysik, Universität Wien, Währinger Strasse 17, A-1090 Wien, Austria

M. Bichler

Atominstitut der Österreichischen Universitäten, Stadionallee 2, A-1020 Wien, Austria

S. Dababneh

Faculty of Science and Information Technology, Al-Balqa Applied University, P.O. Box 7051, Salt 19117, Jordan

S. Bisterzo^‡ and R. Gallino^§

Dipartimento di Fisica Generale, Università di Torino and Sezione INFN di Torino, I-10125 Torino, Italy

^*Electronic address: christof.vockenhuber@triumf.ca; also at Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6.
^†Also at Departement für Physik und Astronomie, Universität Basel, Switzerland.
^‡Also at Institut für Kernphysik, Forschungszentrum Karlsruhe, Postfach 3640, D-76021 Karlsruhe, Germany.
^§Also at Centre for Stellar and Planetary Astrophysics, Monash University, Victoria 3800, Australia.

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Vol. 75, Iss. 1 — January 2007

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Physical Review C

covering nuclear physics

Stellar ( $n, γ$ ) cross sections of ${}^{174}{Hf}$ and radioactive ${}^{182}{Hf}$

C. Vockenhuber, I. Dillmann, M. Heil, F. Käppeler, N. Winckler, W. Kutschera, A. Wallner, M. Bichler, S. Dababneh, S. Bisterzo, and R. Gallino

Phys. Rev. C 75, 015804 – Published 12 January 2007

Abstract

Authors & Affiliations

Article Text (Subscription Required)

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Physical Review C

covering nuclear physics

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

C. Vockenhuber, I. Dillmann, M. Heil, F. Käppeler, N. Winckler, W. Kutschera, A. Wallner, M. Bichler, S. Dababneh, S. Bisterzo, and R. Gallino

Phys. Rev. C 75, 015804 – Published 12 January 2007

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Stellar ( $n, γ$ ) cross sections of ${}^{174}{Hf}$ and radioactive ${}^{182}{Hf}$