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Measurement of the Survival Probabilities for Hot Fusion Reactions

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  • We have studied the fission-neutron emission competition in highly excited ²⁷⁴Hs (Z = 108) (where the fission barrier is due to shell effects) formed by a hot fusion reaction. Matching cross bombardments (²⁶Mg + ²⁴⁸Cm and ²⁵Mg + ²⁴⁸Cm) were used to identify the properties of first chance fission of ²⁷⁴Hs. A Harding-Farley analysis of the fission neutrons emitted in the [superscript 25,26]Mg + ²⁴⁸Cm was performed to identify the prescission and postscission components of the neutron multiplicities in each system. (Γ[subscript n]/Γ[subscript t]) for the first chance fission of ²⁷⁴Hs (E* = 63 MeV) is 0.89 ± 0.13; i.e., ∼90% of the highly excited nuclei survive. The high value of that survival probability is due to dissipative effects during deexcitation. A proper description of the survival probabilities of excited superheavy nuclei formed in hot fusion reactions requires consideration of both dynamic and static (shell-related) effects.
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  • Yanez, R., Loveland, W., Yao, L., Barrett, J. S., Zhu, S., Back, B. B., ... & Albers, M. (2014). Measurement of the Survival Probabilities for Hot Fusion Reactions. Physical Review Letters, 112(15), 152702. doi:10.1103/PhysRevLett.112.152702
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  • 112
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  • 15
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  • This work was supported in part by the Director, Office of Energy Research, Division of Nuclear Physics of the Office of High Energy and Nuclear Physics of the U.S. Department of Energy under Grant No. DE-FG06-97ER41026 and Contract No. DE-AC02-06CH11357.
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