Multiple Coulomb excitation of a beam and the interpretation of the state as a deformed intruderM. Sugawara1, Y. Toh2, T. Czosnyka3, M. Oshima2, T. Hayakawa2, H. Kusakari4, Y. Hatsukawa2, J. Katakura2, N. Shinohara2, M. Matsuda2, T. Morikawa5, A. Seki6 and F. Sakata6
1 Chiba Institute of Technology, Narashino, Chiba 275-0023, Japan
2 Japan Atomic Energy Research Institute, Tokai, Ibaraki 319-1195, Japan
3 Heavy Ion Laboratory, Warsaw University, Warsaw PL-02097, Poland
4 Chiba University, Inage-ku, Chiba 263-8522, Japan
5 Kyushu University, Hakozaki, Fukuoka 812-8581, Japan
6 Department of Mathematical Sciences, Ibaraki University, Mito, Ibaraki 310-8512, Japan
(Received: 2 September 2002 / Revised version: 4 November 2002 / Published online: 25 February 2003)
Electromagnetic properties of the low-lying states in a nucleus were studied through the multiple Coulomb excitation of a beam with a Pb target. Relative -ray intensities were measured as a function of emission angle relative to the scattered projectile. Sixteen E2 matrix elements, including diagonal ones, for 6 low-lying states have been determined using the least-squares search code GOSIA. The expectation values of 0 1+ and 0 2+ states in are compared with those in . Simple mixing calculations indicate that the 0 2+ states in and can be treated as deformed intruder states. It is shown that the deformed intruder becomes the ground state in . These interpretations of the 0 2+ states in this region are compared with the potential-energy surface calculations by the Nilsson-Strutinsky model, which allow to interpret the experimental results in a qualitative way from the theoretical point of view.
25.70.De - Coulomb excitation.
21.10.Ky - Electromagnetic moments.
23.20.-g - Electromagnetic transitions.
© Società Italiana di Fisica, Springer-Verlag 2003