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APS » Journals » Phys. Rev. Lett. » Volume 96 » Issue 19
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Phys. Rev. Lett. 96, 192501 (2006) [4 pages]

Partial Photoneutron Cross Sections for the Isomeric State 180Tam

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S. Goko1, H. Utsunomiya1, S. Goriely2, A. Makinaga1, T. Kaihori1, S. Hohara1, H. Akimune1, T. Yamagata1, Y.-W. Lui3, H. Toyokawa4, A. J. Koning5, and S. Hilaire6
1Department of Physics, Konan University, Okamoto 8-9-1, Higashinada, Kobe 658-8501, Japan
2Institute d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, Campus de la Plaine, CP-226, 1050 Brussels, Belgium
3Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
4National Institute of Advanced Industrial Science and Technology, 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
5Nuclear Research and Consultancy Group, P.O. Box 25, NL-1755 ZG Petten, The Netherlands
6Département de Physique Théorique et Appliquée, Service de Physique Nucléaire, B.P. 12, F-91680 Bruyères-le-Châtel, France

Received 20 December 2005; published 16 May 2006

Photoneutron cross sections for 181Ta(γ,n)180Tam were determined from simultaneous measurements of total cross sections (σtot) and ground-state cross sections (σgs) for 180Ta in photodisintegration of 181Ta with laser Compton-backscattered γ rays. Techniques of direct neutron counting and photoactivation were used for the measurement of σtot and σgs, respectively. The partial cross sections for the isomeric state serves as a novel probe of the nuclear level density of 180Ta. Implications for the p- and s-process nucleosynthesis of 180Tam are given.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.192501
DOI:
10.1103/PhysRevLett.96.192501
PACS:
25.20.−x, 21.10.Ma, 26.50.+x, 27.70.+q
 
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