Phys. Rev. C 79, 051303(R) (2009) [4 pages]Selectivity of the one-neutron knockout reaction on 45Cl and the collapse of the N=28 shell closure
Neutron hole states in the exotic N=27 isotope 44Cl have been populated using the intermediate-energy single-neutron knockout reaction 9Be(45Cl,44Cl)X. The momentum distribution of the residual 44Cl nuclei after direct population of the ground state is consistent with removal of an l=1 neutron. This observation and comparison with a shell-model calculation imply that p3/2 neutrons from above the N=28 major shell closure play important roles in the ground states of both 44Cl and 45Cl. The present result is significant because 44Cl is even closer to the valley of stability than 43S, where a similar result was recently obtained using a g-factor measurement. © 2009 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevC.79.051303
DOI:
10.1103/PhysRevC.79.051303
PACS:
24.50.+g, 21.10.Jx, 25.60.Gc, 27.40.+z
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