First Results from the NPDGamma Experiment at the Spallation Neutron Source

Nuclear shell structure is a benchmark for our understanding of the underlying nuclear forces. Recent investigations of nuclei far away from stability have revealed that magic numbers can change locally leading to the disappearance of classic shell gaps and the appearance of new magic numbers.

In this talk I will present selected results from our experimental program at GSI Darmstadt and ISOLDE/CERN that has focused on probing shell structure in exotic nuclei through knock-out and transfer reactions as well decay spectroscopy. In particular I will report on (i)the results of (d,p) and (t,p) reactions at REX-ISOLDE probing shell evolution and shape coexistence at N=20 and 28, (ii) a knock-out study of neutron-rich Sc isotopes near N=34, and (iii) our study of the beta decay of 100Sn establishing it a superallowed Gamow-Teller decay.

Argonne Physics Division Seminar Schedule