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Evolution of nuclear shell structure due to the pion exchange potential

Abstract : 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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Submitted on : Tuesday, December 5, 2006 - 12:36:02 PM
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Wenhui Long, Hiroyuki Sagawa, Jie Meng, Nguyen van Giai. Evolution of nuclear shell structure due to the pion exchange potential. EPL - Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2008, 82 (1), pp.12001. ⟨10.1209/0295-5075/82/12001⟩. ⟨in2p3-00118445⟩



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