A new spontaneous fission mode for {sup 252}Cf: Hyperdeformation, cluster radioactivity, new levels
- Vanderbilt Univ., Nashville, TN (United States). Physics Dept.
- Joint Institute for Nuclear Research, Dubna (Russian Federation); and others
Direct measurements of yields and neutron multiplicities were made for Sr-Nd, Zr-Ce, Mo-Ba, Ru-Xe, and Pd-Te from {gamma}-ray coincidence studies in spontaneous fission of {sup 252}Cf. Strong enhancement of the 7-10 {nu} emission channels is seen in the Mo-Ba data. Unfolding the Mo-Ba data revealed a new fission mode associated with the enhanced {nu} yields with much lower total kinetic energy going by {sup 108}Mo-{sup 144}Ba, {sup 107}Mo- {sup 145}Ba, and/or {sup 106}Mo-{sup 146}Ba. Analysis indicates one or more of {sup 144,145,146}Ba are hyperdeformed with 3:1 axis ratio. Theoretical calculations predict a third minimum in the PES for {sup 252}Cf with {beta}{sub 2} {approximately} 0.9 and {beta}{sub 3} {approximately} 0.7. Zero neutron emission channels, a new form of cluster radioactivity, are seen in 8 and 7 correlated pairs in SF of {sup 252}Cf and {sup 242}Pu, respectively, with the odd-odd zero neutron channel yields strongly enhanced as predicted for cluster radioactivity. New level structures and isotopes include new octupole deformations, identical bands and other structures.
- Research Organization:
- Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States); Vanderbilt Univ., Nashville, TN (United States); EG and G Idaho, Inc., Middletown, PA (United States); Tennessee Univ., Knoxville, TN (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States); Alexander von Humboldt-Stiftung, Bonn (Germany); Ministry of Sciences (Russian Federation); Joint Inst. for Nuclear Research, Dubna (Russian Federation)
- DOE Contract Number:
- AC05-84OR21400; FG05-88ER40407; AC07-76ID01570; FG05-87ER40361
- OSTI ID:
- 172090
- Report Number(s):
- CONF-950475-1; ON: DE96003761; CNN: Grant 94-02-05584-a; TRN: 96:003703
- Resource Relation:
- Conference: 15. nuclear physics divisional conference of the European Physical Society (EPS): Low energy nuclear dynamics (LEND-15), St. Petersburg (Russian Federation), 18-22 Apr 1995; Other Information: PBD: 1995
- Country of Publication:
- United States
- Language:
- English
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