Two-phonon 1- state in 112Sn observed in resonant photon scattering
Pysmenetska, I. · Walter, S. · Enders, J. · von Garrel, H. · Karg, O. · Kneissl, U. · Kohstall, C. · von Neumann-Cosel, P. · Pitz, H. H. · Ponomarev, V. Yu. · Scheck, M. · Stedile, F. · Volz, S.
Original · EN
Results of a photon scattering experiment on 112Sn using bremsstrahlung with an endpoint energy of E₀ = 3.8 MeV are reported. A J = 1 state at Eₓ = 3434(1) keV has been excited. Its decay width into the ground state amounts to Gamma₀ = 151(17) meV, making it a candidate for a [2+ x 3-]1- two-phonon state. The results for 112Sn are compared with quasiparticle-phonon model calculations as well as the systematics of the lowest-lying 1- states established in other even-mass tin isotopes. Contrary to findings in the heavier stable even-mass Sn isotopes, no 2+ states between 2 and 3.5 MeV excitation energy have been detected in the present experiment.
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