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Report No.

Induced fission studies of Z $$<$$ 82 nuclei at the JAEA Tandem Facility

Smallcombe, J.; Nishio, Katsuhisa; Hirose, Kentaro; Nishinaka, Ichiro; Makii, Hiroyuki; Orlandi, R.; Tamura, Nobuyuki*; Goto, Shinichi*; Otsuki, Tsutomu*; Andreyev, A.*; Tsekhanovich, I.*

Recent $$beta$$-delayed fission studies of proton rich $$^{180}$$Hg showed the fission to be dominated by asymmetric fragment masses, in contrast to initial predictions. Models of the potential-energy surface for the path toward scission showed a lower fission barrier for an asymmetrically deformed $$^{180}$$Hg volume. As a probe of this theoretical interpretation, fission of $$^{180}$$Hg was induced through the symmetric reaction $$^{90}$$Z$$+^{90}$$Z. Mass and energy distributions of fragments for a series of bombarding energies were recorded using 2 MWPCs. As a continuation of Z $$<82$$ fission studies, fission induced in the $$^{7}$$Li$$+^{182,184,186}$$W reactions were measured. Near A$$sim$$190 a new region of asymmetric fission is predicted to emerge as one moves towards neutron rich nuclei. In preliminary investigations mass asymmetry was observed in fragments of the $$^{7}$$Li$$+^{186}$$W reaction. However, fragment kinematics were inconsistent with fission of $$^{193}$$Ir formed by fusion. A follow up experiment was conducted in an attempt to confirm the first observation of fission induced by the $$^{7}$$Li breakup-fusion reaction $$^{186}$$W$$(^{7}$$Li,$$^{4}$$He$$)^{189}$$Re. Experimental details and initial results will be presented.



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