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Study of $$^{249}$$Cf by Coulomb excitation gamma-ray spectroscopy

クーロン励起ガンマ線分光法による$$^{249}$$Cfの研究

Pham, T. T.*; 柳原 陸斗*; 井手口 栄治*; Orlandi, R. ; 西尾 勝久  ; 牧井 宏之  ; 浅井 雅人 ; 廣瀬 健太郎 ; 塚田 和明 ; 豊嶋 厚史*; 佐藤 哲也  ; 伊藤 由太 ; 青井 考*; 山本 康嵩*; Kumar Raju, M.*; Hoang, H. T.*; 甲田 旭*; Go, S.*; Tanaka, M.*; Wakabayashi, R.*

Pham, T. T.*; Yanagihara, Rikuto*; Ideguchi, Eiji*; Orlandi, R.; Nishio, Katsuhisa; Makii, Hiroyuki; Asai, Masato; Hirose, Kentaro; Tsukada, Kazuaki; Toyoshima, Atsushi*; Sato, Tetsuya; Ito, Yuta; Aoi, Nori*; Yamamoto, Yasutaka*; Kumar Raju, M.*; Hoang, H. T.*; Koda, Asahi*; Go, S.*; Tanaka, M.*; Wakabayashi, R.*

The study of nuclei near Z=100 and N=152 provides a link to the nuclear structure of super-heavy elements in the Island of Stability. At the JAEA Tandem accelerator, safe Coulomb-excitation $$gamma$$-ray spectroscopy of $$^{249}$$Cf was carried out for the first time. In the experiment, a 20$$mu$$g/cm$$^2$$ $$^{249}$$Cf target was irradiated with stable beams of $$^{18}$$O and $$^{58}$$Ni. The projectiles were detected using two Silicon stripped detectors, while the $$gamma$$ rays emitted by $$^{249}$$Cf were detected using 4 HPGe detectors and 4 LaBr$$_3$$(Ce) scintillators. The intensity of the measured E2 transitions combined with the angular information from the Si detector data and other experimental parameters were used as an input in the GOSIA code to deduce the B(E2) value of the observed transitions which is linked to the quadrupole deformation of the nucleus. The measured B(E2) will be compared to the systematics of the region and future plans will be discussed.

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