1211.4069 (P. -A. Söderström et al.)

High-spin structure in $^{40}$K    [PDF]

P. -A. Söderström, F. Recchia, J. Nyberg, A. Gadea, S. M. Lenzi, A. Poves, A. Ataç, S. Aydin, D. Bazzacco, P. Bednarczyk, M. Bellato, B. Birkenbach, D. Bortolato, A. J. Boston, H. C. Boston, B. Bruyneel, D. Bucurescu, E. Calore, B. Cederwall, L. Charles, J. Chavas, S. Colosimo, F. C. L. Crespi, D. M. Cullen, G. de Angelis, P. Désesquelles, N. Dosme, G. Duchêne, J. Eberth, E. Farnea, F. Filmer, A. Görgen, A. Gottardo, J. Grębosz, M. Gulmini, H. Hess, T. A. Hughes, G. Jaworski, J. Jolie, P. Joshi, D. S. Judson, A. Jungclaus, N. Karkour, M. Karolak, R. S. Kempley, A. Khaplanov, W. Korten, J. Ljungvall, S. Lunardi, A. Maj, G. Maron, W. Męczyński, D. Mengoni, C. Michelagnoli, P. Molini, D. R. Napoli, P. J. Nolan, M. Norman, A. Obertelli, Zs. Podolyak, A. Pullia, B. Quintana, N. Redon, P. H. Regan, P. Reiter, A. P. Robinson, E. Şahin, J. Simpson, M. D. Salsac, J. F. Smith, O. Stézowski, Ch. Theisen, D. Tonev, C. Unsworth, C. A. Ur, J. J. Valiente-Dobón, A. Wiens

High-spin states of $^{40}$K have been populated in the fusion-evaporation reaction $^{12}$C($^{30}$Si,np)$^{40}$K and studied by means of $\gamma$-ray spectroscopy techniques using one AGATA triple cluster detector, at INFN - Laboratori Nazionali di Legnaro. Several new states with excitation energy up to 8 MeV and spin up to $10^-$ have been discovered. These new states are discussed in terms of J=3 and T=0 neutron-proton hole pairs. Shell-model calculations in a large model space have shown a good agreement with the experimental data for most of the energy levels. The evolution of the structure of this nucleus is here studied as a function of excitation energy and angular momentum.

View original: http://arxiv.org/abs/1211.4069