Transition width of the Jπ=1- two-phonon state of Sr 88

The ground-state decay width of the two-phonon Jπ=1-, 4742 keV state of Sr88 has been determined with the relative self-absorption method combined with a monoenergetic photon beam. This width is important to determine the decay transition strengths into the ground state and the one-phonon 21+ and 31- levels which are required to verify the two-phonon character of the Jπ=1- state. The experiment was performed at the High Intensity γ-ray Source (HIγS) using a novel experimental approach to adapt the relative self-absorption method to monoenergetic photon beams. The result for the ground-state decay width is, thus, independent of any calibration standard and confirms the two-phonon character of the Sr88,Jπ=1-, 4742 keV state within an improved uncertainty.

Duke Scholars

Author Werner Tornow Physics

Author Sean Finch