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Z=50 core stability in Sn 110 from magnetic-moment and lifetime measurements

  • Author(s): Kumbartzki, GJ;
  • Benczer-Koller, N;
  • Speidel, KH;
  • Torres, DA;
  • Allmond, JM;
  • Fallon, P;
  • Abramovic, I;
  • Bernstein, LA;
  • Bevins, JE;
  • Crawford, HL;
  • Guevara, ZE;
  • Gürdal, G;
  • Hurst, AM;
  • Kirsch, L;
  • Laplace, TA;
  • Lo, A;
  • Matthews, EF;
  • Mayers, I;
  • Phair, LW;
  • Ramirez, F;
  • Robinson, SJQ;
  • Sharon, YY;
  • Wiens, A
  • et al.
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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