%0 Journal Article
%T Position of the single-particle 3/2- state in 135Sn and the N = 90 subshell closure
%A Jungclaus, A.
%A Doornenbal, P.
%A Acosta, J.
%A Vaquero, V.
%A Browne, F.
%A Cortes, M. L.
%A Gargano, A.
%A Koiwai, T.
%A Naidja, H.
%A Taniuchi, R.
%A Tostevin, J. A.
%A Wimmer, K.
%A Algora, A.
%A Baba, H.
%A Fernandez, A.
%A Lalovic, N.
%A Nacher, E.
%A Rubio, B.
%A Sakurai, H.
%J Physics Letters B
%D 2024
%V 851
%I Elsevier
%@ 0370-2693
%G English
%F Jungclaus_etal2024
%O WOS:001208129000001
%O exported from refbase (https://references.ific.uv.es/refbase/show.php?record=6114), last updated on Mon, 06 May 2024 12:56:35 +0000
%X 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.
%R 10.1016/j.physletb.2024.138561
%U https://doi.org/10.1016/j.physletb.2024.138561
%P 138561-5pp