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Title: Stellar (n,{gamma}) cross sections of {sup 174}Hf and radioactive {sup 182}Hf

Abstract

The stellar neutron capture cross sections of {sup 174}Hf and the radioactive isotope {sup 182}Hf (t{sub 1/2}=8.9x10{sup 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, {sup 174}Hf from the p-process by a series of photodisintegration reactions of heavier seed nuclei, and {sup 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 {sup 7}Li(p,n){sup 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 <{sigma}>{sub 30}=983{+-}46 and 141{+-}8 mb for {sup 174}Hf and {sup 182}Hf, respectively.

Authors:
; ; ; ; ; ; ; ; ; ;  [1];  [2];  [3];  [4];  [5];  [6]
  1. TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3 (Canada)
  2. (Germany)
  3. (VERA), Institut fuer Isotopenforschung und Kernphysik, Universitaet Wien, Waehringer Strasse 17, A-1090 Wien (Austria)
  4. (Austria)
  5. (Jordan)
  6. (Italy)
Publication Date:
OSTI Identifier:
20990981
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. C, Nuclear Physics; Journal Volume: 75; Journal Issue: 1; Other Information: DOI: 10.1103/PhysRevC.75.015804; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; BERYLLIUM 7; CROSS SECTIONS; HAFNIUM 174; HAFNIUM 182; KEV RANGE 10-100; LITHIUM 7; NEUTRON REACTIONS; NEUTRON SPECTRA; NEUTRON STARS; PHOTONUCLEAR REACTIONS; R PROCESS; S PROCESS; VAN DE GRAAFF ACCELERATORS

Citation Formats

Vockenhuber, C., Dillmann, I., Heil, M., Kaeppeler, F., Winckler, N., Kutschera, W., Wallner, A., Bichler, M., Dababneh, S., Bisterzo, S., Gallino, R., Institut fuer Kernphysik, Forschungszentrum Karlsruhe, Postfach 3640, D-76021 Karlsruhe, Vienna Environmental Research Accelerator, Atominstitut der Oesterreichischen Universitaeten, Stadionallee 2, A-1020 Wien, Faculty of Science and Information Technology, Al-Balqa Applied University, P.O. Box 7051, Salt 19117, and Dipartimento di Fisica Generale, Universita di Torino and Sezione INFN di Torino, I-10125 Torino. Stellar (n,{gamma}) cross sections of {sup 174}Hf and radioactive {sup 182}Hf. United States: N. p., 2007. Web. doi:10.1103/PHYSREVC.75.015804.
Vockenhuber, C., Dillmann, I., Heil, M., Kaeppeler, F., Winckler, N., Kutschera, W., Wallner, A., Bichler, M., Dababneh, S., Bisterzo, S., Gallino, R., Institut fuer Kernphysik, Forschungszentrum Karlsruhe, Postfach 3640, D-76021 Karlsruhe, Vienna Environmental Research Accelerator, Atominstitut der Oesterreichischen Universitaeten, Stadionallee 2, A-1020 Wien, Faculty of Science and Information Technology, Al-Balqa Applied University, P.O. Box 7051, Salt 19117, & Dipartimento di Fisica Generale, Universita di Torino and Sezione INFN di Torino, I-10125 Torino. Stellar (n,{gamma}) cross sections of {sup 174}Hf and radioactive {sup 182}Hf. United States. doi:10.1103/PHYSREVC.75.015804.
Vockenhuber, C., Dillmann, I., Heil, M., Kaeppeler, F., Winckler, N., Kutschera, W., Wallner, A., Bichler, M., Dababneh, S., Bisterzo, S., Gallino, R., Institut fuer Kernphysik, Forschungszentrum Karlsruhe, Postfach 3640, D-76021 Karlsruhe, Vienna Environmental Research Accelerator, Atominstitut der Oesterreichischen Universitaeten, Stadionallee 2, A-1020 Wien, Faculty of Science and Information Technology, Al-Balqa Applied University, P.O. Box 7051, Salt 19117, and Dipartimento di Fisica Generale, Universita di Torino and Sezione INFN di Torino, I-10125 Torino. Mon . "Stellar (n,{gamma}) cross sections of {sup 174}Hf and radioactive {sup 182}Hf". United States. doi:10.1103/PHYSREVC.75.015804.
@article{osti_20990981,
title = {Stellar (n,{gamma}) cross sections of {sup 174}Hf and radioactive {sup 182}Hf},
author = {Vockenhuber, C. and Dillmann, I. and Heil, M. and Kaeppeler, F. and Winckler, N. and Kutschera, W. and Wallner, A. and Bichler, M. and Dababneh, S. and Bisterzo, S. and Gallino, R. and Institut fuer Kernphysik, Forschungszentrum Karlsruhe, Postfach 3640, D-76021 Karlsruhe and Vienna Environmental Research Accelerator and Atominstitut der Oesterreichischen Universitaeten, Stadionallee 2, A-1020 Wien and Faculty of Science and Information Technology, Al-Balqa Applied University, P.O. Box 7051, Salt 19117 and Dipartimento di Fisica Generale, Universita di Torino and Sezione INFN di Torino, I-10125 Torino},
abstractNote = {The stellar neutron capture cross sections of {sup 174}Hf and the radioactive isotope {sup 182}Hf (t{sub 1/2}=8.9x10{sup 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, {sup 174}Hf from the p-process by a series of photodisintegration reactions of heavier seed nuclei, and {sup 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 {sup 7}Li(p,n){sup 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 <{sigma}>{sub 30}=983{+-}46 and 141{+-}8 mb for {sup 174}Hf and {sup 182}Hf, respectively.},
doi = {10.1103/PHYSREVC.75.015804},
journal = {Physical Review. C, Nuclear Physics},
number = 1,
volume = 75,
place = {United States},
year = {Mon Jan 15 00:00:00 EST 2007},
month = {Mon Jan 15 00:00:00 EST 2007}
}