New Binary And Ternary Spontaneous Modes For Cf-252 And New Band Structures With Gammasphere

APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY - PROCEEDINGS OF THE FOURTEENTH INTERNATIONAL CONFERENCE, PTS 1 AND 2(1997)

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摘要
Prompt gamma-gamma-gamma coincidence studies following spontaneous fission of Cf-252 were carried out at Gammasphere first with 36 and later with 72 Ge detectors. Yields and neutron multiplicities were measured directly for Sr-Nd, Zr-Ce Mo-Ba, Ru-Xe, and Pd-Te correlated pairs. A new hot fission mode was discovered going via only Mo-108-Ba-144, Mo-107-Ba-145, and/or Mo-106-Ba-146 pairs where one or more of Ba-144,Ba-145,Ba-146 are hyperdeformed at scission with 3:1 axis ratio. For the first time correlated pairs involved in cold ternary fission were observed with the third particle He-4, possibly He-6, and Be-10. The Ba142-146 data provide evidence for the predicted disappearance of stable octupole deformation at high spins. New level structures and isotopes include new octupole deformations, identical bands and other structures.
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