Coulomb excitation of 174Hf K-isomer. γ-ray spectroscopy with high-spin isomer beam

• Published in: Physics letters. B 1995-05, Vol.350 (2), p.169-172
• Main Authors: Morikawa, T., Gono, Y., Morita, K., Kishida, T., Murakami, T., Ideguchi, E., Kumagai, H., Liu, G.H., Ferragut, A., Yoshida, A., Zhang, Y.H., Oshima, M., Sugawara, M., Kusakari, H., Ogawa, M., Nakajima, M., Tsuchida, H., Mitarai, S., Odahara, A., Kidera, M., Shibata, M., Kim, J.C., Chae, S.J., Hatsukawa, Y., Ishihara, M.
• Format: Article
• Language: English
• ISSN: 0370-2693; 1873-2445
• DOI: 10.1016/0370-2693(95)00345-L

A new experimental technique utilizing a high-spin isomer beam (HSIB) has been developed. The HSIB of 174Hf was produced by the 9Be( 170Er, 5 n) 174Hf reaction in inverse kinematics. By using the HSIB, the Coulomb excitation of the K π = 8 − isomer in 174Hf was measured. The γ-rays from the 9 − level, which is the first excited state built on the isomer, were observed as well as the cascade γ-rays of the ground-state rotational band. From the measured γ-ray yield, a value of 2 ± 1 e 2b 2 was extracted for the B( E2: 8 − → 9 −). This is the first experiment of γ-ray spectroscopy by means of the HSIB-induced secondary reactions.