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Nuclear structure studies of $$^{254}$$Es region by Coulomb excitation $$gamma$$-ray spectroscopy

柳原 陸斗; 井手口 栄治*; 西尾 勝久; Orlandi, R.; 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; et al.

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What is the limit of high Z nucleus, where is the island of stability, is one of the focus of nuclearphysics. Key ingredient to stabilize nucleus in this super-heavy region is shell structure and Z=114,120, N=184 are predicted to be new magic numbers. However, it is not easy to produce such nucleus and study the shell structure. In order to access such shell structure, we are focusing on the deformed nucleus of the heavy mass region including Es isotopes. By studying the excited states, spin and parity, and deformation, we will be able to access the single-particle orbital which is supposed to generate new shell structure at Z=114, 120, N=184 and try to investigate nuclear shell structure in the super-heavy mass region. Coulomb excitation experiment at the Tokai Tandem Accelerator Laboratory of JAEA is planned to measure B(E2) values of low-lying states in $$^{254}$$Es and to deduce the deformation. Unknown high-lying states of $$^{254}$$Es will be also investigated for further understanding of nuclear structure in this region. We obtained $$^{254}$$Es via an international collaboration with ORNL. CAGRA will be used to measure the $$gamma$$ rays from $$^{254}$$Es. Experimental plan and preparation progress will be presented.

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

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*; et al.

no journal, , 

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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