M1 {gamma} Strength for Zirconium Nuclei in the Photoneutron Channel

Journal Article · Fri Apr 25 04:00:00 EDT 2008 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.100.162502· OSTI ID:21128075

Utsunomiya, H; Kondo, T; Kaihori, T; Makinaga, A; Akimune, H; Yamagata, T ^[1]; Goriely, S ^[2]; Goko, S ^[3]; Toyokawa, H; Matsumoto, T; Harano, H ^[4]; Hohara, S ^[5]; Lui, Y -W ^[6]; Hilaire, S; Peru, S ^[7]; Koning, A J ^[8]

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1. Department of Physics, Konan University, Okamoto 8-9-1, Higashinada, Kobe 658-8501 (Japan)
2. Institut d'Astronomie et d'Astrophysique, Universite Libre de Bruxelles, Campus de la Plaine, CP-226, 1050 Brussels (Belgium)
3. Japan Atomic Energy Agency, Tokai-mura, Naka, Ibaraki 319-1195 (Japan)
4. National Institute of Advanced Industrial Science and Technology, Tsukuba 305-8568 (Japan)
5. Atomic Energy Research Institute, Kinki University, Kowakae 3-4-1, Osaka 577-8502 (Japan)
6. Cyclotron Institute, Texas A and M University, College Station, Texas 77843 (United States)
7. Departement de Physique Theorique et Appliquee, Service de Physique Nucleaire, B.P. 12 - F-91680 Bruyeres-le-Chatel (France)
8. Nuclear Research and Consultancy Group, P.O. Box 25, NL-1755 ZG Petten (Netherlands)

Photoneutron cross sections were measured for {sup 91}Zr, {sup 92}Zr, and {sup 94}Zr 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 {sup 92}Zr together with the neutron capture on {sup 91}Zr 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 {sup 91}Zr and {sup 94}Zr. 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.

• OSTI ID: 21128075
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 16 Vol. 100; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CAPTURE
CROSS SECTIONS
GAMMA RADIATION
HARTREE-FOCK-BOGOLYUBOV THEORY
INELASTIC SCATTERING
MEV RANGE 01-10
NEUTRON REACTIONS
NEUTRON SEPARATION ENERGY
PROTONS
RANDOM PHASE APPROXIMATION
RESONANCE
ZIRCONIUM 91
ZIRCONIUM 92
ZIRCONIUM 94