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Srebrny, J.; Droste, Ch.; Morek, T.; Starosta, K.; Juutinen, S.; Piiparinen, M.; Toermaenen, S.; Virtanen, A.
International symposium on exotic nuclear structures. Book of abstracst2000
International symposium on exotic nuclear structures. Book of abstracst2000
AbstractAbstract
[en] Complete text of publication follows. Lifetimes in four negative parity bands of 119I were measured using DSAM and RDM. 119I nuclei were produced in the 109Ag(13C,3n) reaction, γγ coincidences were collected using the NORDBALL array. The detailed description of experiment is given in (1,2,3). Information about electromagnetic properties of four negative parity bands, originating from the h11/2 quasiproton coupled to an axially asymmetric core, was obtained. The lifetimes of 31 negative parity levels were determined. That is one of the largest sets of electromagnetic transition probabilities for an odd - A nucleus from the 50 < Z,N < 82 region yet obtained. The experimental data presented in this paper and in (4) allow us to draw a conclusion concerning the shape of the 119I nucleus. We see that the 53-rd proton added to the 118Te nucleus, through the polarisation effect, changes the properties of the even-even core. The β-deformation becomes at least as large as that of 120Xe (β ∼ 0.28), whereas the γ-deformation is around 30 deg. Comparison of experimental data with calculation within Core Quasiparticle Coupling Model indicates the advantage of the γ- soft model over the γ-rigid one in the description of h11/2 band structure in 119I. One can see, that the most valuable information concerning the shape of 119I is based on the properties of the unfavoured states, especially those belonging to band 9, with their regular energy spacing and fast intraband transitions. (author)
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Hungarian Academy of Sciences, Budapest (Hungary). Inst. of Nuclear Research (ATOMKI); Kernfysisch Versneller Inst. (KVI), Groningen (Netherlands); 106 p; 2000; p. 30; International symposium on exotic nuclear structures; Debrecen (Hungary); 15-20 May 2000; 4 refs.
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