Surprises at the N = 20 Shell Closure Far from Stability by Inelastic Scattering

概要

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Following mass-measurements in the region N = 20 and N = 28, we have studied inelastic nuclear scattering for the nuclei ^34Si, ^33Al and ^32Mg. No evidence for a low lying shape isomeric 0^+ state was found in ^34Si, and an upper limit for the population cross section could be established, rendering it's existence very unlikely. A new transition was found in ^33Al, that is a good candidate for a 2p-2h state and therefore a determination of the 2p-2h gap at N = 20. Inelastic nuclear scattering strongly excites 3^- states, as seen in ^34Si. A strong transition was found in ^32Mg that should correspond to the first 3^- in this nucleus, lying very low as compared to theory and systematics in this region.
理論物理学刊行会の論文
2002-12-26