1997•AIP conference proceedingsRequires access
New binary and ternary spontaneous modes for [sup 252]Cf and new band structures with gammasphere
J. H. Hamilton, A. V. Ramayya, G. M. Ter–Akopian, J. K. Hwang, J. Kormicki, B. R. S. Babu, A. Sãndulescu, A. Florescu, W. Greiner, Yu. Ts. Oganessian, A. V. Daniel, S. J. Zhu, M. G. Wang, T. N. Ginter, J. K. Deng, W. C., G. S. Popeko, Q. H. Lu, E. F. Jones, R. S. Dodder, P. M. Gore, J. O. Rasmussen, S. J. Asztalos, I. Y. Lee, Steven Chu, Κ. Ε. Gregorich, A. O. Macchiavelli, M. F. Mohär, S.G. Prussin, M. A. Stoyer, R. W. Lougheed, K. J. Moody, J. F. Wild, J. D. Cole, R. Aryaeinejad, Y. X. Dardenne, M. W. Drigert, K. Butler-Moore
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Abstract
Prompt γ-γ-γ coincidence studies following spontaneous fission of 252Cf 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 108Mo-144Ba, 107Mo-145Ba, and/or 106Mo-146Ba pairs where one or more of 144,145,146Ba 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 4He, possibly 6He, and 10Be. The 142-146Ba 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.