Evolution of Nuclear Shell Structure due to the Pion Exchange Potential

Details Evolution of Nuclear Shell Structure due to the Pion Exchange Potential Evolution of Nuclear Shell Structure due to the Pion Exchange Potential

2006-09-28

arxiv.org/abs/nucl-th/0609076v1

Europhys.Lett.82:12001,2008

Physics

Nuclear Physics

Nuclear Theory

4 pages and 4 figures

Scientific paper

10.1209/0295-5075/82/12001

The evolution of nuclear shell structure is investigated for the first time within density-dependent relativistic Hartree-Fock theory and the role of $\pi$-exchange potential is studied in detail. The energy differences between the neutron orbits $\Lrb{\nu1h_{9/2},\nu 1i_{13/2}}$ in the N=82 isotones and between the proton ones $\Lrb{\pi1g_{7/2},\pi1h_{11/2}}$ in the Z=50 isotopes are extracted as a function of neutron excess $N-Z$. A kink around $Z = 58$ for the N=82 isotones is found as an effect resulting from pion correlations. It is shown that the inclusion of $\pi$-coupling plays a central role to provide realistic isospin dependence of the energy differences. In particular, the tensor part of the $\pi$-coupling has an important effect on the characteristic isospin dependence observed in recent experiments.

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