γ-ray spectroscopy of one-proton knockout from45Cl

In-beam γ -ray spectroscopy of S38–42

“…In Section III, we compare the mization to explain the complex structure of the N = 28 isotones 42 Si and 44 S, comprising phenomena such as shape and configuration coexistence, on a common footing [3]. Furthermore, SDPF-U level schemes are available in the literature for 39 S [38], 40 S [18], and 41 S [17].…”

“…42 S Figure 15 shows the Doppler-reconstructed γ-ray spectrum taken in coincidence with 42 S reaction residues resulting from the fragmentation of 46 Ar. More than 15 γ-ray transitions are identified in the spectrum.…”

“…In fact, we observe a 3002 keV γ-ray that then becomes a candidate to depopulate this new state directly to the ground state. We associate this state tentatively with the second 2 + state of 42 S. The shell model predicts the 2 + 2 level at 3072 keV with a 84% branch to the ground state and the remaining 16% decaying to the 2 + 1 state. From our intensities in Table V we obtain a decay branching of 85(2)% to the ground state and 15(2)% to the 2 + 1 level.…”

“…It was pointed out by Utsuno et al [3] that tensor-driven shell evolution plays a critical role in the rapid shape transitions that occur in the S and Si isotopic chains towards N = 28. These effects are included in the SDPF-MU effective shell-model interaction introduced in [3] and the resulting predictions for the 40,41,42 S level schemes will be tested in the present work. The sulfur isotopes between N = 20 and N = 28 have been studied with a variety of experimental techniques [10][11][12][13][14][15][16][17][18][19][20], however, information on the level schemes even at low excitation energy is still scarce.…”

“…Neutron-rich N = 28 isotones -comprising 48 Ca, 46 Ar, 44 S, and 42 Si -have provided much insight into the changes of the structure of nuclei encountered in the regime of large isospin. Evidence for a breakdown of the traditional N = 28 magic number resulted from the pioneering observation of low-lying quadrupole collectivity in 44 S [1,2] and fueled the field of rare-isotope science in the quest to unravel the origin of shell and shape evolution in exotic nuclei with experimental programs worldwide.…”