Speakers
Description
The hexadecapole deformation, as well as the quadrupole one, influences the low-lying states of finite nuclei. The hexadecapole correlations are often overshadowed by the large quadrupole effects, and hence have not been much investigated. We have investigated hexadecapole ($Q_4$) deformed configurations in microscopic calculations involving the deformed Hartree-Fock theory [1]. $K=0$ configurations are investigated in even-even nuclei. Physical states of good angular momentum are obtained by Peierls-Yoccoz angular momentum projection technique from intrinsic configurations [2]. These $Q_4$ deformed bands have large $E4$ transition rates, and $E2$ transitions are rather low. Such bands (along with the ground and low excitation bands) and their spectra, as well as transition rates have been obtained by us in the Zr regions in the Sn region and the rare-earths. These $Q_4$ deformed bands, calculated by us in Sn, Zr and the rare-earth nuclei, occur about 20 MeV above ground states and have very strong $E4$ intra-band matrix elements. The characteristic of low intra-band E2 rates for the $Q_4$ bands can help identify such bands at high excitation energies. The detailed results will be discussed during the conference.
[1] G. Ripka, The Hartree-Fock theory of deformed light nuclei, in Advances in Nuclear Physics, edited by M. Baranger and E. Vogt, Advances in Nuclear Physics Vol. 1, pp. 183–259, Plenum, 1966.
[2] R. E. Peierls and J. Yoccoz, Proceedings of the Physical Society A 70, 381 (1957).
