Exploring the higher spin state structure of $^{31}$Si by $\gamma$-ray spectroscopy
ORAL
Abstract
We present a comprehensive $\gamma$-ray spectroscopic study to the higher spin structure of $^{31}$Si. $^{31}$Si was produced through the $^{18}$O($^{18}$O,$\alpha$n) reaction at the beam energy of 25 MeV at Argonne National Laboratory, which preferentially populates the higher spin states. The particle-$\gamma$-$\gamma$ coincidence technique was used to build the energy level scheme. The Microball detector was used for selecting the reaction channel, and the multiple $\gamma$-ray coincidences were detected by GAMMASPHERE. The $^{31}$Si recoil energies and angles were kinematically reconstructed event-by-event, leading to a better Doppler correction and allowing us to discover 25 new states and 49 newly-observed $\gamma$ transitions in total. 15 $\gamma$-decaying states above the neutron separation energy at 6587 keV were identified.
*PHY-07-56474, PHY-10-64819, DE-AC02-05CH-11231, DE-FG02-88ER-40406, DE-FG02-94ER-40834
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