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Phys. Rev. C 72, 025808 (2005) [9 pages]

Photodisintegration cross section measurements on 186W, 187Re, and 188Os: Implications for the Re-Os cosmochronology

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T. Shizuma1, H. Utsunomiya2, P. Mohr3, T. Hayakawa1,9, S. Goko2, A. Makinaga2, H. Akimune2, T. Yamagata2, M. Ohta2, H. Ohgaki4, Y.-W. Lui5, H. Toyokawa6, A. Uritani7, and S. Goriely8
1Advanced Photon Research Center, Japan Atomic Energy Research Institute, 8-1 Umemidai, Kizu, Kyoto 619-0215, Japan
2Department of Physics, Konan University, Japan
3Strahlentherapie, Diakoniekrankenhaus Schwäbisch Hall, Germany
4Institute of Advanced Energy, Kyoto University, Japan
5Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
6Photonics Research Institute, National Institute of Advanced Industrial Science and Technology, Japan
7National Metrology Institute, National Institute of Advanced Industrial Science and Technology, Japan
8Institute d'Astronomie et d'Astrophysique, Université Libre de Bruxelles, Belgium
9National Astronomical Observatory, Mitaka, Tokyo 181-8588, Japan

Received 31 January 2005; published 31 August 2005

Cross sections of the 186W, 187Re, 188Os(γ,n) reactions were measured using quasimonochromatic photon beams from laser Compton scattering with average energies from 7.3 to 10.9 MeV. The results are compared with the predictions of Hauser-Feshbach statistical calculations using four different sets of input parameters. In addition, the inverse neutron capture cross sections were evaluated by constraining the model parameters, especially the E1 strength function, on the basis of the experimental data. The present experiment helps to further constrain the correction factor Fσ for the neutron capture on the 9.75 keV state in 187Os. Implications of Fσ for the Re-Os cosmochronology are discussed with a focus on the uncertainty in the estimate of the age of the galaxy.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.72.025808
DOI:
10.1103/PhysRevC.72.025808
PACS:
25.20.-x, 25.40.Lw, 26.20.+f, 98.35.Ac
 
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