In-beam spectroscopic studies of the44S nucleus

Abstract

The structure of the 44 S nucleus has been studied at GANIL through the one proton knock-out reaction from a 45 Cl secondary beam at 42 A·MeV. The γ rays following the de-excitation of 44 S were detected in flight using the 70 BaF 2 detectors of the Château de Cristal array. An exhaustive γ γ -coincidence analysis allowed an unambiguous construction of the level scheme up to an excitation energy of 3301 keV. The existence of the spherical 2 + 2 state is confirmed and three new γ -ray transitions connecting the prolate deformed 2 + 1 level were observed. Comparison of the experimental results to shell model calculations further supports a prolate and spherical shape coexistence with a large mixing of states built on the ground state band in 44 S.

In-beamγ-ray spectroscopy of43−46Cl

“…For 45 Cl, the change is less significant and the tensor correction required is still more than double that of the other nuclei considered. However, the ground-state J π assignment of 45 Cl has not been established experimentally, although 1/2 + has been favored from systematics and comparisons with theory [8,27]. Given that the ground and first excited state are within less than 200 keV, a 3/2 + ground-state and 1/2 + excited-state assignment has to be considered.…”