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APS » Journals » Phys. Rev. Lett. » Volume 100 » Issue 16
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Phys. Rev. Lett. 100, 162502 (2008) [4 pages]

M1 γ Strength for Zirconium Nuclei in the Photoneutron Channel

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H. Utsunomiya1, S. Goriely2, T. Kondo1, T. Kaihori1, A. Makinaga1, S. Goko3, H. Akimune1, T. Yamagata1, H. Toyokawa4, T. Matsumoto4, H. Harano4, S. Hohara5, Y.-W. Lui6, S. Hilaire7, S. Péru7, and A. J. Koning8
1Department of Physics, Konan University, Okamoto 8-9-1, Higashinada, Kobe 658-8501, Japan
2Institut d’Astronomie et d’Astrophysique, Université Libre de Bruxelles, Campus de la Plaine, CP-226, 1050 Brussels, Belgium
3Japan Atomic Energy Agency, Tokai-mura, Naka, Ibaraki 319-1195, Japan
4National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568, Japan
5Atomic Energy Research Institute, Kinki University, Kowakae 3-4-1, Osaka 577-8502, Japan
6Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
7Département de Physique Théorique et Appliquée, Service de Physique Nucléaire, B.P. 12 - F-91680 Bruyères-le-Châtel, France
8Nuclear Research and Consultancy Group, P.O. Box 25, NL-1755 ZG Petten, The Netherlands

Received 30 November 2007; published 24 April 2008

Photoneutron cross sections were measured for 91Zr, 92Zr, and 94Zr near the neutron separation energy with quasimonochromatic γ rays. The data exhibit some extra components around the neutron threshold. A coherent analysis of the photoneutron data for 92Zr together with the neutron capture on 91Zr based on the microscopic Hartree-Fock-Bogoliubov plus quasiparticle random-phase approximation model for the E1 strength has revealed the presence of an M1 resonance at 9 MeV. The microscopic approach systematically shows the same M1 strength in the photoneutron cross section for 91Zr and 94Zr. The total M1 strength is about 75% larger than the strength predicted by the systematics, being qualitatively consistent with the giant M1 resonance observed in the inelastic proton scattering.

© 2008 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.100.162502
DOI:
10.1103/PhysRevLett.100.162502
PACS:
25.20.−x, 21.10.Pc, 21.60.Jz, 27.60.+j
 
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