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Two-phonon 1- state in 112Sn observed in resonant photon scattering

I. Pysmenetska·S. Walter·J. Enders·H. von Garrel·O. Karg·U. Kneissl·C. Kohstall·P. von Neumann-Cosel·H. H. Pitz·V. Yu. Ponomarev·M. Scheck·F. Stedile·S. Volz
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Abstract

Results of a photon scattering experiment on 112Sn using bremsstrahlung with an endpoint energy of E_0 = 3.8 MeV are reported. A J = 1 state at E_x = 3434(1) keV has been excited. Its decay width into the ground state amounts to Gamma_0 = 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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I. Pysmenetska, S. Walter, J. Enders, H. von Garrel, O. Karg, U. Kneissl, C. Kohstall, P. von Neumann-Cosel, H. H. Pitz, V. Yu. Ponomarev, M. Scheck, F. Stedile, S. Volz. 2005-12-08. Two-phonon 1- state in 112Sn observed in resonant photon scattering. https://doi.org/10.1103/physrevc.73.017302

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