166 research outputs found
Synthesis and Properties of Even–Even Nuclei with Z = 114–116 Produced in 48 Ca Induced Reactions
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Superheavy nuclei from 48Ca-induced reactions
No full textAbstractThe discovery and investigation of the new region of superheavy nuclei at the DGFRS separator based on fusion reactions of 48Ca with 238U–249Cf target nuclei are reviewed. The production cross sections and summaries of the decay properties, including the results of the posterior experiments performed at the SHIP, BGS, and TASCA separators, as well as at the chemistry setups, are discussed and compared with the theoretical calculations and the systematic trends in the α-decay and spontaneous fission properties. The properties of the new nuclei, isotopes of elements 112–118, and their decay products demonstrate significant increases in the stability of the heaviest nuclei with increasing neutron number and closer approach to magic number N=184
FUTURE PROSPECTS FOR THE SYNTHESIS AND STUDY OF THE PROPERTIES OF SHE. FACTORY OF SUPERHEAVY ELEMENTS
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A new spontaneous fission mode for {sup 252}Cf: Hyperdeformation, cluster radioactivity, new levels
No full textDirect 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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