Regular Article - Theoretical Physics
Revisiting the role of n-p residual interaction and the Newby shift in K = 0 bands in the odd-odd actinides
Amity Institute of Nuclear Science and Technology, Amity University, 201307, Noida, India
* e-mail: email@example.com
Accepted: 6 August 2019
Published online: 20 September 2019
We present an analysis of all the known bands in the deformed odd-odd actinide nuclei using the two quasiparticle plus rotor model to obtain the values of Newby shift. The Newby shift so obtained is expected to be free from the Coriolis mixing effects. A total of 11 bands of 238Np, 234Pa, 240-244Am and 250Bk have been analyzed. We find that the staggering pattern in all the cases is properly reproduced. We also examine the validity of an empirical rule to obtain the sign of the Newby shift. We find that for the 8 cases when , the rule predicts correct sign but the rule does not work in rest of the 3 cases when . As an important outcome of our study, we propose the spin parity assignments and level energies of the and G-M partner bands in 240Am, . We resolve the tentative nature of the assignments and present a unique level scheme. Also, we predict the band-head energy of bands in four cases, namely three bands of 238Np and one band of 240Am , where the band-head energy is not known experimentally. These results may be useful for future experiments.
© Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature, 2019