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High angular momentum states populated in fragmentation reactions

2005; Elsevier BV; Volume: 632; Issue: 2-3 Linguagem: Inglês

10.1016/j.physletb.2005.10.070

1873-2445

Zs. Podolyák, J. Gerl, M. Hellström, F. Becker, K. Gladnishki, M. Górska, A. Kelić, Y. Kopatch, S. Mandal, P. H. Regan, K.‐H. Schmidt, P. M. Walker, H. J. Wollersheim, A. Banu, G. Benzoni, H. J. Boardman, E. Casarejos, J. Ekman, H. Geißel, H. Grawe, D. Höhn, I. Kojouharov, J. Leske, R. Lozeva, M. N. Mineva, G. Neyens, R. D. Page, C. J. Pearson, M. Portillo, D. Rudolph, N. Saito, H. Schaffner, D. Sohler, K. Sümmerer, J. J. Valiente‐Dobón, C. Wheldon, H. Weick, M. Winkler,

Nuclear Physics and Applications

The population of metastable states produced in relativistic-energy fragmentation of a 238U beam has been measured. For states with angular momentum ≳20ℏ, a much higher population than expected has been observed. By introducing a collective component to the generation of angular momentum the experimental data can be understood. This is the first time that a collective degree of freedom has be shown to play a major role in such high-energy collisions.