Structure of the N=50 As, Ge, Ga nuclei

Sahin, E.; Angelis, G..D.; Duchene, G.; Faul, T.; Gadea, A.; Lisetskiy, A.F.; Ackermann, D.; Algora, A.; Aydin, S.; Azaiez, F.; Bazzacco, D.; Benzoni, G.; Bostan, M.; Byrski, T.; Celikovic, I.; Chapman, R.; Corradi, L.; Courtin, S.; Curien, D.; Pramanik, U..D.; Didierjean, F.; Dorvaux, O.; Erduran, M.N.; Erturk, S.; Farnea, E.; Fioretto, E.; France, G..D.; Franchoo, S.; Gall, B.; Gottardo, A.; Guiot, B.; Haas, F.; Ibrahim, F.; Ince, E.; Khouaja, A.; Kusoglu, A.; Rana, G..L.; Labiche, M.; Lebhertz, D.; Lenzi, S.; Leoni, S.; Lunardi, S.; Mason, P.; Mengoni, D.; Michelagnoli, C.; Modamio, V.; Montagnoli, G.; Montanari, D.; Moro, R.; Mouginot, B.; Napoli, D.R.; O’Donnell, D.; Oliveira, J.R.B.; Ollier, J.; Orlandi, R.; Pollarolo, G.; Recchia, F.; Robin, J.; Salsac, M.; Scarlassara, F.; Singh, R.P.; Silvestri, R.; Smith, J.F.; Stefan, I.; Stefanini, A.M.; Subotic, K.; Szilner, S.; Toneva, D.; Torres, D.A.; Trotta, M.; Ujic, P.; Ur, C.; Valiente Dobón, J.J.; Verney, D.; Yalcinkaya, M.; Wady, P.T.; Wiedemann, K.T.; Zuber, K.

doi:10.1016/j.nuclphysa.2012.08.007

The level structures of the N=50 83As, 82Ge, and 81Ga 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 γ-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 78Ni (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.

Structure of the N=50 As, Ge, Ga nuclei / E. Sahin, G..D. Angelis, G. Duchene, T. Faul, A. Gadea, A.F. Lisetskiy, D. Ackermann, A. Algora, S. Aydin, F. Azaiez, D. Bazzacco, G. Benzoni, M. Bostan, T. Byrski, I. Celikovic, R. Chapman, L. Corradi, S. Courtin, D. Curien, U..D. Pramanik, F. Didierjean, O. Dorvaux, M.N. Erduran, S. Erturk, E. Farnea, E. Fioretto, G..D. France, S. Franchoo, B. Gall, A. Gottardo, B. Guiot, F. Haas, F. Ibrahim, E. Ince, A. Khouaja, A. Kusoglu, G..L. Rana, M. Labiche, D. Lebhertz, S. Lenzi, S. Leoni, S. Lunardi, P. Mason, D. Mengoni, C. Michelagnoli, V. Modamio, G. Montagnoli, D. Montanari, R. Moro, B. Mouginot, D.R. Napoli, D. O’Donnell, J.R.B. Oliveira, J. Ollier, R. Orlandi, G. Pollarolo, F. Recchia, J. Robin, M.-. Salsac, F. Scarlassara, R.P. Singh, R. Silvestri, J.F. Smith, I. Stefan, A.M. Stefanini, K. Subotic, S. Szilner, D. Toneva, D.A. Torres, M. Trotta, P. Ujic, C. Ur, J.J. Valiente-Dobón, D. Verney, M. Yalcinkaya, P.T. Wady, K.T. Wiedemann, K. Zuber. - In: NUCLEAR PHYSICS. A. - ISSN 0375-9474. - 893(2012 Nov 02), pp. 1-12.