Complete Spectroscopy of 87,88,89Sr with (n,γ) and (d,p) Reactions?*

Abstract

Over the recent years the nuclear structure around the N=50 shell closure, which is very pronounced in the strontium and zirconium isotopes, has been the subject of extensive experimental and theoretical work1–5). On the proton side Z=38 and Z=40 provide fairly closed sub-shells1). In the strontium isotopes the lg9/2 neutron shell is closed at 88Sr, supplying relatively pure neutron-hole and neutron-particle states with large spectroscopic factors in 87Sr and 89Sr, as well as core-coupled states. The mass region is thus ideally suited to examine the transition from a correlated to an uncorrelated (chaotic?) excitational behavior6,7). These two types are characterized e.g. by the density of excited states, the transition strengths, and the spectroscopic factors observed in transfer reactions.