TY  - JOUR
AU  - Jungclaus, A.
AU  - Doornenbal, P.
AU  - Acosta, J.
AU  - Vaquero, V.
AU  - Browne, F.
AU  - Cortes, M. L.
AU  - Gargano, A.
AU  - Koiwai, T.
AU  - Naidja, H.
AU  - Taniuchi, R.
AU  - Tostevin, J. A.
AU  - Wimmer, K.
AU  - Algora, A.
AU  - Baba, H.
AU  - Fernandez, A.
AU  - Lalovic, N.
AU  - Nacher, E.
AU  - Rubio, B.
AU  - Sakurai, H.
PY  - 2024
DA  - 2024//
TI  - Position of the single-particle 3/2- state in 135Sn and the N = 90 subshell closure
T2  - Phys. Lett. B
JO  - Physics Letters B
SP  - 138561
EP  - 5pp
VL  - 851
PB  - Elsevier
AB  - The decay of excited states of the nucleus Sn-135, with three neutrons outside the doubly-magic Sn-132 core, was studied in an experiment performed at the Radioactive Isotope Beam Factory at RIKEN. Several gamma rays emitted from excited Sn-135 ions were observed following one-neutron and one-neutron-one-proton removal from Sn-136 and Sb-137 beams, respectively, on a beryllium target at relativistic energies. Based on the analogy to 133Sn populated via one-neutron removal from Sn-134, an excitation energy of 695(15) keV is assigned to the 3/2(-) state with strongest single-particle character in 135Sn. This result provides the first direct information about the evolution of the neutron shell structure beyond N = 82 and thus allows for a crucial test of shellmodel calculations in this region. The experimental findings are in full agreement with calculations performed employing microscopic effective two-body interactions derived from CD-Bonn and N3LO nucleon-nucleon potentials, which do not predict a pronounced subshell gap at neutron number N=90. The occurrence of such a gap in Sn-140, i.e., when the 1f(7/2) orbital is completely filled, had been proposed in the past, in analogy to the magicity of Ca-48, featuring a completely filled 0f(7/2) orbital one harmonic oscillator shell below.
SN  - 0370-2693
UR  - https://doi.org/10.1016/j.physletb.2024.138561
DO  - 10.1016/j.physletb.2024.138561
LA  - English
N1  - WOS:001208129000001
ID  - Jungclaus_etal2024
ER  -