Rotational structures in doubly odd 198Tl

Particle-rotor model for doubly odd transitional nuclei of the Tl-region

“…The first one actually appears to be realized in T1 [8,9]. The second one is expected in more proton defficient nuclei like the Au isotopes where the 7zh11/2 qp state is known to come nearer to the Fermi surface [8,10]. The main aim of the present work is to show that, indeed, the simple picture referred to above is able to provide an explanation for all especial features found in the experiments.…”

“…K~ (K<> =lf2,+f2p[,_ a I~ being the expansion coefficients of the yrast wave function in the strong coupling basis [8].) Some of these distributions are given in Figure 1 for the proton along with the d91~(n/2) small Wigner matrices which correspond to a completely decoup- ter of this excitation) with minor deviations which will be discussed below.…”

“…These two are 7~h9/z@Vi13/2 and "~hlt/2@~i13/2. The first one actually appears to be realized in T1 [8,9]. The second one is expected in more proton defficient nuclei like the Au isotopes where the 7zh11/2 qp state is known to come nearer to the Fermi surface [8,10].…”

“…A brief account of the model will be given first (further details may be found in [8]). The Hamiltonian is:…”

IBFFM yrast states in odd-odd nuclei associated withO(6) andSU(3) limits

“…The collective features of odd-odd nuclei have been previously studied in the particle-plus-rotor model [12][13][14][15][16] and in the particle-plus-vibrator model [17,18]. We note that the latter case corresponds to the boson-fermion description without symmetry constraints and exchange interaction.…”