Position of the single-particle 3/2− state in 135Sn and the N=90 subshell closure

The decay of excited states of the nucleus 135Sn, with three neutrons outside the doubly-magic 132Sn core, was studied in an experiment performed at the Radioactive Isotope Beam Factory at RIKEN. Several γ rays emitted from excited 135Sn ions were observed following one-neutron and one-neutron-one-proton removal from 136Sn and 137Sb beams, respectively, on a beryllium target at relativistic energies. Based on the analogy to 133Sn populated via one-neutron removal from 134Sn, 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 shell-model 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 140Sn, i.e., when the 1f7/2 orbital is completely filled, had been proposed in the past, in analogy to the magicity of 48Ca, featuring a completely filled 0f7/2 orbital one harmonic oscillator shell below.

Doornenbal, P.RIKEN Institute of Physical and Chemical Research (författare)
Acosta, J.CSIC Instituto de Estructura de la Materia (IEM) (författare)
Vaquero, V.CSIC Instituto de Estructura de la Materia (IEM) (författare)
Browne, F.RIKEN Institute of Physical and Chemical Research (författare)
Cortes, M. L.RIKEN Institute of Physical and Chemical Research (författare)
Gargano, A.Istituto Nazionale di Fisica Nucleare, Sezione di Napoli (författare)
Koiwai, T.University of Tokyo (författare)
Naïdja, H.University Of Constantine 1 (författare)
Taniuchi, R.University of Tokyo (författare)
Tostevin, J. A.University of Surrey (författare)
Wimmer, K.GSI Helmholtz Centre for Heavy Ion Research (författare)
Algora, A.University of Valencia (författare)
Baba, H. (författare)
Fernández, A.CSIC Instituto de Estructura de la Materia (IEM) (författare)
Lalović, N.Lund University,Lunds universitet,Kärnfysik,Fysiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Nuclear physics,Department of Physics,Departments at LTH,Faculty of Engineering, LTH(Swepub:lu)nucl-nli (författare)
Nácher, E.University of Valencia (författare)
Rubio, B.University of Valencia (författare)
Sakurai, H.University of Tokyo (författare)
CSIC Instituto de Estructura de la Materia (IEM)RIKEN Institute of Physical and Chemical Research (creator_code:org_t)

Ingår i:Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics8510370-2693

Av författaren/redakt...: Jungclaus, A.; Doornenbal, P.; Acosta, J.; Vaquero, V.; Browne, F.; Cortes, M. L.; visa fler...; Gargano, A.; Koiwai, T.; Naïdja, H.; Taniuchi, R.; Tostevin, J. A.; Wimmer, K.; Algora, A.; Baba, H.; Fernández, A.; Lalović, N.; Nácher, E.; Rubio, B.; Sakurai, H.; visa färre...

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