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Shell and shape evolution at N=28: The Mg40 ground state

H. L. Crawford et al.
Phys. Rev. C 89, 041303(R) – Published 30 April 2014

Abstract

A measurement of the direct two-proton removal from Si42 has provided the first structural information on the N=28 isotone Mg40. The value for the inclusive cross section for two-proton removal from Si42 of 4017+27 μb is significantly lower than that predicted by structure calculations using the recent SDPF-MU shell-model effective interaction combined with eikonal reaction theory. This observed discrepancy is consistent with the interpretation that only one of the predicted low-lying 0+ states in Mg40 is bound. A two-state mixing analysis describing two-proton knockout cross sections along N=28 provides support for the interpretation of a prolate-deformed Mg40 ground state.

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  • Received 20 December 2013

DOI:https://doi.org/10.1103/PhysRevC.89.041303

©2014 American Physical Society

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Vol. 89, Iss. 4 — April 2014

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