期刊
PHYSICAL REVIEW LETTERS
卷 118, 期 9, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.118.092502
关键词
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资金
- DOE [DE-FG02-95ER4093]
- NSF [PHY-1404442]
- High-Performance Computing Center of Helmholtz-Zentrum Dresden-Rossendorf
- Center for Information Services and High-Performance Computing of Technische Universitat Dresden
- Center for Research Computing of the University of Notre Dame
Low-energy M1 strength functions of (60,64, 68) Fe are determined on the basis of large-scale shell-model calculations with the goal to study their development from the bottom to the middle of the neutron shell. We find that the zero-energy spike, which characterizes nuclei near closed shells, develops toward the middle of the shell into a bimodal structure composed of a weaker zero-energy spike and a scissorslike resonance around 3 MeV, where the summed strengths of the two structures change within only 8% around a value of 9.8 mu(2)(N). The summed strength of the scissors region exceeds the total. absorption strength from the ground state by a factor of about three, which explains the discrepancy between total strengths of the scissors resonance derived from(gamma,gamma') experiments and from experiments using light-ion induced reactions.
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