NEUTRON-PROTON INTERACTION IN ODD-ODD SPHERICAL NUCLEI NEAR 208PB

A total of 74 levels from 21 multiplets of the nuclei 206 Tl , 208 Tl , 208 Bi , and 210 Bi have been calculated with a Generalized Intermediate Coupling Model, with Gaussian and delta potentials with and without an interaction between octupole phonon and odd nucleons. The goodness of fit is compared with that of other calculations of Molinari et al. and Schiffer and True. It is quite clear that the calculations work well in spite of the fact that they are required to fit simultaneously odd-odd nuclei with neutron and proton shells which differ by principal harmonic oscillator quantum numbers Δ N = +1.

Decay of 143Eu

A high resolution study of γ-ray transitions in 143Sm following the β+ decay of 143Eu has been made using Ge(Li) detectors. Fifty-seven γ rays are assigned to the decay of 143Eu, and the ground state spin of 143Eu is established as 5/2+. Spin and parity assignments are made on the basis of γ-ray branching, deduced log ft values, and by comparison with previous (p,d) reaction data. Good agreement between experiment and predictions of the intermediate coupling model suggests that this model adequately accounts for the low lying levels of 143Sm.

Energy Spectrum of 51V by the Intermediate Coupling Approach

In recent years the nucleus 51 Y has been extensively studied, both experimentally by Horoshko et al. (1970), using the 48Ti(oc, py)51y reaction, and theoretically in terms of shell model calculations by many authors (McCullen et al. 1964; Horoshko et al. 1970; Lips and McEllistrem 1970). Mixed configuration shell model calculations by Lips and McEllistrem, in particular, have successfully reproduced the low-lying energy levels of5ly. However, strong coupling rotational model calculations by Malik and Scholz (1966) did not give satisfactory results. In the present work, the intermediate coupling unified model (Bohr and Mottelson 1953; Choudhury 1954) is applied to Sly. The purpose of this work is to show that the intermediate coupling model can successfully predict the low-lying energy levels of Sly.

Some Odd Z Nuclei in the 63 ≤ A ≤ 89 Mass Region in the Framework of the Intermediate Coupling Model

The level structures of the nuclei 63Cu, 69Ga, 75As, 79Br, 83Rb, and 89Y are investigated in the framework of the unified model.Each nucleus is considered to consist of an even–even vibrating core and extra-core proton quasiparticle. The quasiparticle–core interaction Hamiltonian is assumed to be given by a dipole plus a quadrupole term. The coupling of a g9/2 state to the vibrating core leads to the formation of states of positive parity with [Formula: see text]. Such states with I up to 11/2+ have been recently observed in the nuclei under investigation. In the case of negative parity states the extra core proton quasiparticle is assumed to have available the p3/2, p1/2, and ƒ5/2 states. Many features of the investigated nuclei are explained by the model at least qualitatively. The present calculations do not exhaust the possibility of improved results. Future experimental data will be highly desirable not only for testing but also for improving the model.