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Persistent decoupling of valence neutrons toward the dripline: Study of C20 by γ spectroscopy

Z. Elekes et al.
Phys. Rev. C 79, 011302(R) – Published 29 January 2009

Abstract

The very neutron-rich nucleus C20 has been investigated by inelastic scattering on Pb208 and liquid hydrogen targets. Through distorted wave analysis, the reduced electric quadrupole transition probability B(E2;0g.s.+21+)<18.4 (stat) e2fm4 and the neutron transition probability Mn2=292±52 (stat) fm4 have been derived. A simple shell model calculation has shown a need for a factor of about 0.4 decrease of the normal polarization charges to elucidate the results. This is interpreted as a decoupling of the valence neutrons from the nuclear core in carbon isotopes heavier than C14.

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  • Received 23 July 2008

DOI:https://doi.org/10.1103/PhysRevC.79.011302

©2009 American Physical Society

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Vol. 79, Iss. 1 — January 2009

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