PT Journal
AU Sahin, Eea
   Gadea, A
   Algora, A
TI Structure of the N=50 As, Ge, Ga nuclei
SO Nuclear Physics A
JI Nucl. Phys. A
PY 2012
BP 1
EP 12
VL 893
DI 10.1016/j.nuclphysa.2012.08.007
LA English
DE NUCLEAR REACTIONS U-238(Se-82; Ga-81); (Se-82; Ge-82); As-83); E=515 MeV; measured E-gamma; I-gamma (theta); gamma gamma-coin; reaction fragments; (fragment)gamma-coin using PRISMA magnetic spectrometer; gamma after deexcitation using Ge Compton-suppressed detectors of CLARA array; thin and thick target; deduced sigma(theta); levels; J; pi; calculated levels; pi using shell model
AB The level structures of the N = 50 As-83, Ge-82, and Ga-81 isotones have been investigated by means of multi-nucleon transfer reactions. A first experiment was performed with the CLARA PRISMA setup to identify these nuclei. A second experiment was carried out with the GASP array in order to deduce the gamma-ray coincidence information. The results obtained on the high-spin states of such nuclei are used to test the stability of the N = 50 shell closure in the region of Ni-78 (Z = 28). The comparison of the experimental level schemes with the shell-model calculations yields an N = 50 energy gap value of 4.7(3) MeV at Z = 28. This value, in a good agreement with the prediction of the finite-range liquid-drop model as well as with the recent large-scale shell model calculations, does not support a weakening of the N = 50 shell gap down to Z = 28.
ER