Role of Long-Range Correlations on the Quenching of Spectroscopic Factors

Details Role of Long-Range Correlations on the Quenching of Spectroscopic Factors Role of Long-Range Correlations on the Quenching of Spectroscopic Factors

2009-09-16

arxiv.org/abs/0909.3040v2

Phys.Rev.Lett.103:202502,2009

Physics

Nuclear Physics

Nuclear Theory

Minor comments added and typos corrected. Accepted for publication on Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.103.202502

We consider the proton and neutron quasiparticle orbits around the closed-shell 56Ni and 48Ca isotopes. It is found that large model spaces (beyond the capability of shell-model applications) are necessary for predicting the quenchings of spectroscopic factors. The particle-vibration coupling is identified as the principal mechanism. Additional correlations--due to configuration with several particle-hole excitations--are estimated using shell-model calculations and generate an extra reduction which is < ~4% for most quasiparticle states. The theoretical calculations nicely agree with (e,e'p) and heavy ion knock-out experiments. These results open a new path for a microscopic understanding of the shell-model.

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