Year: 2024
Type: article
Abstract: \nMeasured binary quasifission mass spectra in reactions with actinide nuclides show a large peak in yield near the doubly-magic 208Pb, generally attributed to enhanced binding energy causing a valley in the potential energy surface, which attracts quasifission trajectories. Measurements of binary quasifission mass spectra and cross-sections have been made for reactions of 50Ti with actinide nuclides from 232Th to 249Cf. Cross-sections have also been deduced for sequential fission (a projectile-like nucleus and two fragments from fission of the complementary target-like nucleus). Binary cross-sections fall from 70% of calculated capture cross-sections for 232Th to only 40% for 249Cf, with a compensating increase in sequential fission cross-sections. The data are consistent with the peak in yield near 208Pb originating largely from sequential fission of heavier fragments produced in more mass-asymmetric primary quasifission events. These are increasingly suppressed as the heavy quasifission fragment mass increases above 208Pb. The important role of sequential fission calls for re-interpretation of quasifission observables and dynamics in superheavy element synthesis reactions.\n
Authors: D.J. Hinde, D.Y. Jeung, J. Buete, K.J. Cook, M. Dasgupta, C. Simenel, E.C. Simpson, H.M. Albers, I.P. Carter, Ch.E. Düllmann, J. Khuyagbaatar, E. Prasad, C. Sengupta, J.F. Smith, K. Vo-Phuoc, J. Walshe, E. Williams, A. Yakushev
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
Awards: Creating superheavy elements and isotopes, In one zeptosecond: quantifying energy dissipation in heavy element fusion, Exploiting new breakthroughs in understanding nuclear fission, Quantum thermalisation: a new framework for nuclear collisions, Space for Australia on the periodic table: creating new superheavy elements, Quantum tunnelling of composite systems
OpenAlex ID: W6903571498
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