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

Pham, T. T.; Yanagihara, Rikuto*; Ideguchi, Eiji*; Orlandi, R.  ; Nishio, Katsuhisa   ; Makii, Hiroyuki   ; Hirose, Kentaro  ; Asai, Masato  ; Tsukada, Kazuaki  

Coulomb excitation gamma-ray spectroscopy of the neutron-rich actinide $$^{249}$$Cf was carried out at the JAEA Tandem accelerator, permitting the first direct measurement of the quadrupole deformation of this nucleus. The $$^{249}$$Cf target was irradiated with beams of $$^{58}$$Ni and $$^{18}$$O, leading to the population of excited states up to spin 31/2$$hbar$$. The $$gamma$$ rays emitted by $$^{249}$$Cf were detected using an array of Ge and LaBr$$_3$$ scintillators placed around the reaction chamber. The scattered beam was detected using segmented silicon detectors placed at forward and backward angles. The intensity of the observed E2 transitions, combined with the scattering angle of incoming particle, detector geometry, beam intensity, etc. were used as input for the GOSIA code to deduce the B(E2) value to determine the deformation of $$^{249}$$Cf.

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