Journal
PHYSICAL REVIEW LETTERS
Volume 106, Issue 2, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.106.022502
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Funding
- U.S. NSF [PHY-0606007, PHY-0758099, MRI PHY-0619497]
- DFG (Germany) [DE1516/1-1]
- GSI, F.u.E. [OK/JOL]
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The transition rates for the 2(1)(+) states in Fe-62,Fe-64,Fe-66 were studied using the recoil distance Doppler-shift technique applied to projectile Coulomb excitation reactions. The deduced E2 strengths illustrate the enhanced collectivity of the neutron-rich Fe isotopes up to N = 40. The results are interpreted using the generalized concept of valence proton symmetry which describes the evolution of nuclear structure around N = 40 as governed by the number of valence protons with respect to Z approximate to 30. The trend of collectivity suggested by the experimental data is described by state-of-the-art shell-model calculations with a new effective interaction developed for the fpgd valence space.
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