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

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

2005-12-08

arxiv.org/abs/nucl-ex/0512013v1

Phys.Rev. C73 (2006) 017302

Physics

Nuclear Physics

Nuclear Experiment

10 pages, including 2 figures, Phys. Rev. C, in press

Scientific paper

10.1103/PhysRevC.73.017302

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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