Neutron single-particle strength in silicon isotopes: Constraining the driving forces of shell evolution
Nuclear Experiment
2015-06-24 v1 Nuclear Theory
Abstract
Shell evolution is studied in the neutron-rich silicon isotopes 36,38,40 Si using neutron single-particle strengths deduced from one-neutron knockout reactions. Configurations involving neutron excita- tions across the N = 20 and N = 28 shell gaps are quantified experimentally in these rare isotopes. Comparisons with shell model calculations show that the tensor force, understood to drive the col- lective behavior in 42 Si with N = 28, is already important in determining the structure of 40 Si with N = 26. New data relating to cross-shell excitations provide the first quantitative support for repulsive contributions to the cross-shell T = 1 interaction arising from three-nucleon forces.
Keywords
Cite
@article{arxiv.1504.02329,
title = {Neutron single-particle strength in silicon isotopes: Constraining the driving forces of shell evolution},
author = {S. R. Stroberg and A. Gade and J. A. Tostevin and V. M. Bader and T. Baugher and D. Bazin and J. S. Berryman and B. A. Brown and C. M. Campbell and K. W. Kemper and C. Langer and E. Lunderberg and A. Lemasson and S. Noji and T. Otsuka and F. Recchia and C. Walz and D. Weisshaar and S. Williams},
journal= {arXiv preprint arXiv:1504.02329},
year = {2015}
}