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Report No.

Isomer spectroscopy using actinide targets

Sugiyama, Koichi*; Go, Shintaro*; Tomimatsu, Taro*; Kai, Tamito*; Nagae, Daisuke*; Ishibashi, Yuichi*; Matsunaga, Sotaro*; Nagata, Yuto*; Nishibata, Hiroki*; Washiyama, Kohei*; Sakaguchi, Satoshi*; Morita, Kosuke*; Orlandi, R. ; Nishio, Katsuhisa  ; Makii, Hiroyuki  ; Hirose, Kentaro ; Ito, Yuta ; Suzaki, Fumi ; Sato, Tetsuya  ; Tsukada, Kazuaki ; Asai, Masato ; Shizuma, Toshiyuki*; Ideguchi, Eiji*; Pham, T. T.*; Niwase, Toshitaka*

We have successfully performed in-beam gamma-ray spectroscopy using the isomer-scope technique to study excited-state structure of neutron-rich heavy-actinide nuclei. The neutron-rich heavy-actinide nuclei were produced in the multinucleon-transfer reactions with a $$^{248}$$Cm target and $$^{18}$$O projectiles accelerated with the JAEA tandem accelerator. Projectile-like scattered particles were detected with Si E-$$Delta$$E telescopes placed at the backward angle, and target-like scattered particles of isomers were caught by an annular aluminum plate placed at about 60-mm downstream from the target. Four Ge detectors and 4 LaBr detectors were placed at the periphery of the aluminum plate, and detected gamma rays from the isomers. Gamma rays emitted from the actinide isomers were successfully observed with a good sensitivity owing to the tungsten shield placed between the target and the detectors.



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