Elsevier

Nuclear Physics A

Volume 371, Issue 2, 30 November 1981, Pages 333-348
Nuclear Physics A

Collective states in even Sn nuclei

https://doi.org/10.1016/0375-9474(81)90071-3Get rights and content

Abstract

0+, 2+, 44 and 3 states in 112–124Sn have been studied with the (p, p′γ) reaction and in Coulomb excitation. Absolute E2 transition rates between these levels have been extracted with the aid of the Winther-de Boer code. For 116,118Sn, B(E2; 41+ → 21+) ≈ 20 W.u., suggesting a two-phonon character of the 41+ states. For the lighter and heavier isotopes, this value is significantly smaller. All observed values of B(E2; 22+ → 21+) and B(E2; 23+→ 21+) are about 5 W.u. Also. values of B(E3; 01+ → 31) have been measured for all stable even Sn nuclei. In 116Sn the branching ratio (31 → 01+)/(31 → 21+) has been measured. From this we obtain a half-life of 0.34±0.07 ps for the first 3 level in 116Sn and B(E1; 31 → 21+) = (1.4±0.3) × 10−5'e2 · b, corresponding to a hindrance factor of 103.

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    Permanent address: Department of Physics, University of Jyväskylä, Finland.

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