Lifetime Measurements and Triple Coexisting Band Structure in S43

Lifetime measurements of excited states in the neutron-rich nucleus ⁴³S were performed by applying the recoil-distance method on fast rare-isotope beams in conjunction with the Gamma-Ray Energy Tracking In-beam Nuclear Array. The new data based on γγ coincidences and lifetime measurements resolve a doublet of (3/2^-) and (5/2^-) states at low excitation energies. Results were compared to the π(sd)-ν(pf) shell model and antisymmetrized molecular dynamics calculations. The consistency with the theoretical calculations identifies a possible appearance of three coexisting bands near the ground state of ⁴³S: the K^π=1/2^- band built on a prolate-deformed ground state, a band built on an isomer with a 1f$\frac{-1}{7/2}$ character, and a suggested excited band built on a newly discovered doublet state. The latter further confirms the collapse of the N=28 shell closure in the neutron-rich region.