The structure of 99Ru from (,3n) reaction
J. Mrázek1 - M.Honusek1 - A. Spalek1 - J. Bielcík1 - J. Slívová1 - J. Adam1 - A.A. Pasternak2
1 Nuclear Physics Institute, Academy of Sciences of the Czech Republic,
Rez near Prague, Czech Republic
2 Physical-Technical Institute "A.F. Joffe'', Cyclotron Laboratory, ul. Politechnitscheskaja 26, 194021 St. Petersburg, Russia
Received: 13 January 1999 / Revised version: 26 March 1999 Communicated by D. Schwalm
The results of in-beam investigations of excited states of 99Ru using the 98Mo(, 3n) reaction are presented. Angular distributions of -rays and - coincidences have been measured. Excited states have been identified up to an energy of E = 5603 keV and spin of I = 31/2-. Mean lifetimes have been determined using the DSA method for eleven levels. Aligned angular momenta are discussed and the probable origin of a backbending at frequency about 0.5 MeV was confirmed. The possible role of alignment at frequencies above 0.5 MeV was pointed out.
27.60.+j Properties of specific nuclei listed by mass ranges 90A149 - 23.20.Lv Gamma transitions and level energies - 23.20.Ck Lifetimes and transition probabilities - 23.20.En Angular distribution and correlation measurements