Open Access
ND 2007
Article Number 019
Number of page(s) 4
Section Nuclear structure and decay data
Published online 17 June 2008
International Conference on Nuclear Data for Science and Technology 2007
DOI: 10.1051/ndata:07103

Investigation of quadrupole deformation of nucleus and its surface dynamic vibrations

I. Boboshin1, B. Ishkhanov2, S. Komarov1, V. Orlin1, N. Peskov1 and V. Varlamov1

1  Skobeltsyn Institute of Nuclear Physics of Lomonosov Moscow State University, 119992 Moscow, Russia
2  Physics Faculty of Lomonosov Moscow State University, 119992 Moscow, Russia

Published online: 21 May 2008

The new complete database - Chart of nuclear quadrupole deformations - was developed using various sources of related information. Using this Chart the system comparative analysis of quadrupole deformation parameters β2 obtained by two different methods was carried out for many nuclei. The clear systematical disagreements of β2 parameters obtained from nuclear quadrupole moments Q ("Q-type" data) and from reduced transition probability B(E2) ↑ for 0+ ${\rm 2}_1^+$ transitions ("B-type" data) were revealed. It was found out that all nuclides investigated are clearly separated into two groups. For all isotopes of "group 1" nuclei good agreement was observed for data of both types. For all isotopes of "group 2" nuclei "B-type" β2 data values are systematically (in many cases significantly) larger than "Q-type" ones. In cases of only few exceptions disagreement for some isotopes are combined with agreements for others. It was shown that two types data difference could be explained in the frame of assumption about the not negligible role of dynamic vibrations of nucleus surface, by other words, about dependence of quadrupole deformation parameter β2 values on surface vibrations of nucleus in ground state. From this point of view "Q-type" β2 values do not take into account nucleus surface vibration, but "B-type" β2 values do that. Therefore "B-type" data reflect not only static nuclear deformation (deviation of nucleus shape from spherical), but dynamic deformation also.

© CEA 2008