Shell-model Interpretation of the Intruder States in ³⁸Cl

The excited states in ³⁸Cl were populated by the ²⁶Mg(¹⁸O, αpnγ)³⁸Cl fusion evaporation reaction at E_lab=50 MeV in John. D. Fox laboratory, Florida State University. The experimental observations have been interpreted by shell model calculations using FSU-A interaction, currently being developed by our group [1]. In this interaction, we have chosen the approach of fitting experimental data started from an existing interaction. The single particle energies of the fp shell orbitals along with the monopole terms from the sd-pf cross shell two body matrix elements were adjusted to fit the experimental data compiled from the nuclei ranging from ²³Ne to ⁴⁰K. The interaction well explains 0hbarΩ and 1hbarΩ states in ³⁸Cl. FSU-A also predicts 0p-0h and 1p-1h states of the nearby isotopes which will also be discussed along with future plans to refine this interaction to make it more universal.

[1] R. S. Lubna, K. Kravvaris, A. Volya, S.L. Tabor, V. Tripathi