Z=50 core stability in Sn110 from magnetic-moment and lifetime measurements

G. J. Kumbartzki, N. Benczer-Koller, K.-H. Speidel, D. A. Torres, J. M. Allmond, P. Fallon, I. Abramovic, L. A. Bernstein, J. E. Bevins, H. L. Crawford, Z. E. Guevara, G. Gürdal, A. M. Hurst, L. Kirsch, T. A. Laplace, A. Lo, E. F. Matthews, I. Mayers, L. W. Phair, F. Ramirez, S. J. Q. Robinson, Y. Y. Sharon, and A. Wiens
Phys. Rev. C 93, 044316 – Published 18 April 2016

Abstract

Background: The structure of the semimagic Sn50 isotopes were previously studied via measurements of B(E2;21+01+) and g factors of 21+ states. The values of the B(E2;21+) in the isotopes below midshell at N = 66 show an enhancement in collectivity, contrary to predictions from shell-model calculations.

Purpose: This work presents the first measurement of the 21+ and 41+ states' magnetic moments in the unstable neutron-deficient Sn110. The g factors provide complementary structure information to the interpretation of the observed B(E2) values.

Methods: The Sn110 nuclei have been produced in inverse kinematics in an α-particle transfer reaction from C12 to Cd106 projectiles at 390, 400, and 410 MeV. The g factors have been measured with the transient field technique. Lifetimes have been determined from line shapes using the Doppler-shift attenuation method.

Results: The g factors of the 21+ and 41+ states in Sn110 are g(21+) = +0.29(11) and g(41+) = +0.05(14), respectively. In addition, the g(41+) = +0.27(6) in Cd106 has been measured for the first time. A line-shape analysis yielded τ(110Sn;21+) = 0.81(10) ps and a lifetime of τ(110Sn;31) = 0.25(5) ps was calculated from the fully Doppler-shifted γ line.

Conclusions: No evidence has been found in Sn110 that would require excitation of protons from the closed Z=50 core.

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  • Received 21 December 2015
  • Revised 8 March 2016

DOI:https://doi.org/10.1103/PhysRevC.93.044316

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

G. J. Kumbartzki1,*, N. Benczer-Koller1, K.-H. Speidel2, D. A. Torres3, J. M. Allmond4, P. Fallon5, I. Abramovic6, L. A. Bernstein5,6,7, J. E. Bevins6, H. L. Crawford5, Z. E. Guevara3, G. Gürdal8, A. M. Hurst5, L. Kirsch6, T. A. Laplace7,6, A. Lo6, E. F. Matthews6, I. Mayers6, L. W. Phair5, F. Ramirez3, S. J. Q. Robinson8, Y. Y. Sharon1, and A. Wiens5

  • 1Department of Physics and Astronomy, Rutgers University, New Brunswick, New Jersey 08903, USA
  • 2Helmholtz-Institut für Strahlen- und Kernphysik, Universität Bonn, D-53115 Bonn, Germany
  • 3Departamento de Física, Universidad Nacional de Colombia, Carrera 30 No 45-03, Bogotá D.C., Colombia
  • 4Physics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 5Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 6Department of Nuclear Engineering, University of California, Berkeley, California 94720, USA
  • 7Lawrence Livermore National Laboratory, Livermore, California 94551, USA
  • 8Physics Department, Millsaps College, Jackson, Mississippi 39210, USA

  • *kum@physics.rutgers.edu

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Issue

Vol. 93, Iss. 4 — April 2016

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