Structure of 16C: Testing shell model and ab initio approaches

M. Petri et al.
Phys. Rev. C 86, 044329 – Published 22 October 2012

Abstract

Excited states in 16C were populated via the 9Be(17N,16C+γ)X one-proton knockout reaction. The lifetime of the 21+ state in 16C was measured using the recoil distance method. The extracted lifetime of τ21+=11.40.9+0.8(stat)±0.7(systBρ)1.5+0.0(systfeeding) ps yields a deduced B(E2;21+01+)=4.210.26+0.34(stat)0.24+0.28(systBρ)0.00+0.64(systfeeding)e2fm4 value in good agreement with a previous measurement. The one-proton knockout cross section is used to extract the proton amplitude of the 16C 21+ state, which confirms the neutron dominant character of this state. Gamma-ray branching ratios between the 22+ state and the 21+ and ground states were also determined. The results are compared with psd shell model and no-core shell model (with NN and NN+NNN) calculations. The inclusion of three-body forces are essential in order for the no-core shell model calculations to reproduce the experimental findings on the γ-ray branching ratios.

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  • Received 26 July 2012

DOI:https://doi.org/10.1103/PhysRevC.86.044329

©2012 American Physical Society

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Vol. 86, Iss. 4 — October 2012

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