A STUDY OF THE DECAY OF XSTw USING A 2 m CURVED-CRYSTAL SPECTROMETER

Abstract: The gamma rays in the decay of lsTw have been studied using the University of Michigan 2 m curved-crystal spectrometer and a lithium-drifted germanium diode spectrometer. One previously unreported transition has been observed and the energies of all observed transitions have been determined with the curved-crystal spectrometer. Upper limits have been determined for the intensities of possible unobserved gamma rays in the 160-1200 keV region. The relative merits and complementarity of the curved crystal spectrometer and the Ge(Li) spectrometer are discussed. In addition, data are presented concerning the reflectivity of the curved crystal using the germanium (022) planes. E l RADIOACTIVITY lSTW[fr°m ls6W(n ' ~')]; measured Er ' It " 187Re deduced lvls " ] N a t u r a l target. 1