M1 γ strength for zirconium nuclei in the photoneutron channel

被引：49

作者：

Utsunomiya, H. ^{[1
]}

Goriely, S. ^{[2
]}

Kondo, T. ^{[1
]}

Kaihori, T. ^{[1
]}

Makinaga, A. ^{[1
]}

Goko, S. ^{[3
]}

Akimune, H. ^{[1
]}

Yamagata, T. ^{[1
]}

Toyokawa, H. ^{[4
]}

Matsumoto, T. ^{[4
]}

Harano, H. ^{[4
]}

Hohara, S. ^{[5
]}

Lui, Y. -W. ^{[6
]}

Hilaire, S. ^{[7
]}

Peru, S. ^{[7
]}

Koning, A. J. ^{[8
]}

机构：

[1] Konan Univ, Dept Phys, Higashinada Ku, Kobe, Hyogo 6588501, Japan

[2] Univ Libre Bruxelles, Inst Astron & Astrophys, B-1050 Brussels, Belgium

[3] Japan Atom Energy Agcy, Naka, Ibaraki 3191195, Japan

[4] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058568, Japan

[5] Kinki Univ, Atom Energy Res Inst, Osaka 5778502, Japan

[6] Texas A&M Univ, Inst Cyclotron, College Stn, TX 77843 USA

[7] Serv Phys Nucl, Dept Phys Theor & Appl, F-91680 Bruyeres Le Chatel, France

[8] Nucl Res & Consultancy Grp, NL-1755 ZG Petten, Netherlands

来源：

PHYSICAL REVIEW LETTERS | 2008年 / 100卷 / 16期

关键词：

D O I：

10.1103/PhysRevLett.100.162502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Photoneutron cross sections were measured for Zr-91, Zr-92, and Zr-94 near the neutron separation energy with quasimonochromatic gamma rays. The data exhibit some extra components around the neutron threshold. A coherent analysis of the photoneutron data for Zr-92 together with the neutron capture on Zr-91 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 Zr-91 and Zr-94. 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.

引用

页数：4

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