Journal
PHYSICAL REVIEW C
Volume 88, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.88.051301
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Funding
- National Science Foundation [PHY-1102511, PHY-0606007, PHY-1068217]
- U.S. Department of Energy, Office of Nuclear Physics [DE-FG02-08ER41556, DE-FG02-94ER40834]
- Research Council of Norway [ISP-Fysikk/216699]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1068217] Funding Source: National Science Foundation
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We report on the experimental study of quadrupole collectivity in the neutron-deficient nucleus Sn-104 using intermediate-energy Coulomb excitation. The B(E2; 0(1)(+). -> 2(1)(+)) value for the excitation of the first 2(+) state in Sn-104 has been measured to be 0.180(37) e(2)b(2) relative to the well-known B(E2) value of Cd-102. This result disagrees by more than one sigma with a recently published measurement [G. Guastalla et al., Phys. Rev. Lett. 110, 172501 (2013)]. Our result indicates that the most modern many-body calculations remain unable to describe the enhanced collectivity below midshell in Sn approaching N = Z = 50. We attribute the enhanced collectivity to proton particle-hole configurations beyond the necessarily limited shell-model spaces and suggest the asymmetry of the B(E2)-value trend around midshell to originate from enhanced proton excitations across Z = 50 as N = Z is approached.
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