A new spontaneous fission mode for {sup 252}Cf: Hyperdeformation, cluster radioactivity, new levels

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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 ... continued below

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15 p.

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Hamilton, J.H.; Ter-Akopian, G.M. & Oganessian, Yu.Ts. December 31, 1995.

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  • Hamilton, J.H. J.W. Goethe Univ., Frankfurt (Germany). Institute for Theoretical Physics
  • Ter-Akopian, G.M. Joint Institute for Nuclear Research, Dubna (Russian Federation)
  • Oganessian, Yu.Ts. Joint Institute for Nuclear Research, Dubna (Russian Federation)

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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.

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15 p.

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INIS; OSTI as DE96003761

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  • 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

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  • Other: DE96003761
  • Report No.: CONF-950475--1
  • Grant Number: AC05-84OR21400;FG05-88ER40407;AC07-76ID01570;FG05-87ER40361
  • Office of Scientific & Technical Information Report Number: 172090
  • Archival Resource Key: ark:/67531/metadc664356

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  • December 31, 1995

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  • June 29, 2015, 9:42 p.m.

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  • Aug. 3, 2016, 1:58 p.m.

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Hamilton, J.H.; Ter-Akopian, G.M. & Oganessian, Yu.Ts. A new spontaneous fission mode for {sup 252}Cf: Hyperdeformation, cluster radioactivity, new levels, article, December 31, 1995; Tennessee. (digital.library.unt.edu/ark:/67531/metadc664356/: accessed June 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.