21+→01+ transition strengths in Sn nuclei

J. N. Orce, S. N. Choudry, B. Crider, E. Elhami, S. Mukhopadhyay, M. Scheck, M. T. McEllistrem, S. W. Yates

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17 Scopus citations


The lifetime of the 21+ state at 1256.7 keV in Sn112 has been determined using the (n,n'γ) reaction. Angular distribution measurements were carried out at a neutron energy of 1.7 MeV, above the 21+ energy threshold and below that of the second excited level. Through the Doppler-shift attenuation method, the lifetime of the 21+ state is determined as 750-90+125 fs, which gives a B(E2;21+→01+) value of 10.9-1.6+1.5 W.u. This E2 strength in Sn112 also allows a redetermination of the B(E2;21+→01+) in Sn108 as 10.8(3.0) W.u. These values result in a symmetric trend around the neutron midshell in the systematics of E2 strengths in the even-mass tin isotopes and do not support N=64 or N=66 subshell gaps. The symmetric trend is in agreement with recent shell model predictions, where proton-core excitations were allowed in the calculations.

Original languageEnglish
Article number021302
JournalPhysical Review C - Nuclear Physics
Issue number2
StatePublished - Aug 20 2007

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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