In-beam gamma-ray spectroscopy of Mg-35 and Na-33

Gade, A; Bazin, D; Brown, BA; Campbell, CM; Cook, JM; Ettenauer, S; Glasmacher, T; Kemper, KW; McDaniel, S; Obertelli, A; Otsuka, Taka; Ratkiewicz, A; Terry, JR; Utsuno, Y; Weisshaar, D

doi:10.1103/PhysRevC.83.044305

In-beam gamma-ray spectroscopy of Mg-35 and Na-33

Author:

Gade, A

Bazin, D ; Brown, BA ; Campbell, CM ; Cook, JM ; Ettenauer, S ; Glasmacher, T ; Kemper, KW ; McDaniel, S ; Obertelli, A ; Otsuka, Taka ; Ratkiewicz, A ; Terry, JR ; Utsuno, Y ; Weisshaar, D

Keywords:

Science & Technology, Physical Sciences, Physics, Nuclear, Physics, INTRUDER CONFIGURATIONS, MASS, DEFORMATION, NUCLEI, 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, 5106 Nuclear and plasma physics

Abstract:

Excited states in the very neutron-rich nuclei 35 Mg and 33 Na were populated in the fragmentation of a 38 Si projectile beam on a Be target at 83 MeV / u beam energy. We report on the first observation of γ -ray transitions in 35 Mg, the odd- N neighbor of 34 Mg and 36 Mg, 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 = 3 Z nucleus 33 Na, a new γ -ray transition was observed that is suggested to complete the γ -ray cascade 7 / 2 + → 5 / 2 + → 3 / 2 + gs connecting three neutron two-particle–two-hole intruder states that are predicted to form a close-to-ideal K = 3 / 2 rotational band in the strong-coupling limit.