Shell closure at N = 34 and the 48Si nucleus

Quadrupole Collectivity in 32 , 34 , 36 , 38 Si and the N 5 20 Shell Closure

R. W. Ibbotson,1 T. Glasmacher,1,2 B. A. Brown,1,2 L. Chen,1,2 M. J. Chromik,1,* P. D. Cottle,3 M. Fauerbach,1,2,† K. W. Kemper,3 D. J. Morrissey,1,4 H. Scheit,1,2 and M. Thoennessen1,2 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824 3Department o...

Lowest excitations in 56Ti and the predicted N=34 shell closure.

Recent experimental characterization of the subshell closure at N=32 in the Ca, Ti, and Cr isotones has stimulated shell-model calculations that indicated the possibility that the N=34 isotones of these same elements could exhibit characteristics of a shell closure, namely, a high energy for the first excited 2(+) level. To that end, we have studied the decay of 56Sc produced in fragmentation r...

Comment on "reduction of the spin-orbit splittings at the n=28 shell closure".

Reduction of the spin-orbit splittings at the n = 28 shell closure.

The N = 28 shell closure has been investigated via the 46Ar(d,p)47Ar transfer reaction in inverse kinematics. Energies and spectroscopic factors of the neutron p(3/2), p(1/2), and f(5/2) states in 47Ar were determined and compared to those of the 49Ca isotone. We deduced a reduction of the N = 28 gap by 330(90) keV and spin-orbit weakenings of approximately 10(2) and 45(10)% for the f and p sta...

Study of the N = 50 Shell Closure Close to 78

The PARRNe (Production d’Atomes Radioactifs Riches en Neutrons) experimental program has been part of the recent R&D efforts for the design of the SPIRAL2 project at GANIL. The PARRNe2 set-up installed at IPNOrsay allows the use of the Tandem as a deuteron driver in order to produce mass separated fission fragment beams. The measured fission fragment yields proved to be high enough to undertake...