arXiv:1103.2413·v2·Nuclear Experiment
In-beam gamma-ray spectroscopy of 35Mg and 33Na
A. Gade🇺🇸 · D. Bazin🇺🇸 · B.A. Brown🇺🇸 · C.M. Campbell🇺🇸 · J.M. Cook🇺🇸 · S. Ettenauer🇺🇸 · T. Glasmacher🇺🇸 · K.W. Kemper🇺🇸 · S. McDaniel🇺🇸 · A. Obertelli🇺🇸 · T. Otsuka🇯🇵 · A. Ratkiewicz🇺🇸
Abstract
Excited states in the very neutron-rich nuclei 35Mg and 33Na were populated in the fragmentation of a 38Si projectile beam on a Be target at 83 MeV/u beam energy. We report on the first observation of gamma-ray transitions in 35Mg, the odd-N neighbor of 34Mg and 36Mg, which are known to be part of the "Island of Inversion" around N = 20. The results are discussed in the framework of large- scale shell-model calculations. For the A = 3Z nucleus 33Na, a new gamma-ray transition was observed that is suggested to complete the gamma-ray cascade 7/2+ --> 5/2+ --> 3/2+ gs connecting three neutron 2p-2h intruder states that are predicted to form a close-to-ideal K = 3/2 rotational band in the strong-coupling limit.
Comments: Accepted for publication Phys. Rev. C. March 16, 2011: Replaced figures 3 and 5. We thank Alfredo Poves for pointing out a problem with the two figures