Article

Reduced quasifission competition in fusion reactions forming neutron-rich heavy elements

K. HammertonDepartment of Chemistry, Michigan State University, East Lansing, Michigan 48824, USAZ. KohleyDepartment of Chemistry, Michigan State University, East Lansing, Michigan 48824, USAD. J. HindeDepartment of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, AustraliaM. DasguptaDepartment of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, AustraliaA. WakhleDepartment of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, AustraliaE. WilliamsDepartment of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, AustraliaV. E. OberackerDepartment of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USAA. S. UmarDepartment of Physics and Astronomy, Vanderbilt University, Nashville, Tennessee 37235, USAI. P. CarterDepartment of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, AustraliaK. J. CookDepartment of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, AustraliaJ. P. GreenePhysics Division, Argonne National Laboratory, Lemont, Illinois 60473, USAD. Y. JeungDepartment of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, AustraliaD. H. LuongDepartment of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, AustraliaS. D. McNeilDepartment of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, AustraliaC. S. PalshetkarDepartment of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, AustraliaD. C. RaffertyDepartment of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, AustraliaC. SimenelDepartment of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, AustraliaK. StiefelDepartment of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA

2015en

ABI

Abstract

Measurements of mass-angle distributions (MADs) for Cr + W reactions, providing a wide range in the neutron-to-proton ratio of the compound system, ${(N/Z)}_{\mathrm{CN}}$, have allowed for the dependence of quasifission on the ${(N/Z)}_{\mathrm{CN}}$ to be determined in a model-independent way. Previous experimental and theoretical studies had produced conflicting conclusions. The experimental MADs reveal an increase in contact time and mass evolution of the quasifission fragments with increasing ${(N/Z)}_{\mathrm{CN}}$, which is indicative of an increase in the fusion probability. The experimental results are in agreement with microscopic time-dependent Hartree-Fock calculations of the quasifission process. The experimental and theoretical results favor the use of the most neutron-rich projectiles and targets for the production of heavy and superheavy nuclei.

Identifiers

DOI: 10.1103/physrevc.91.041602

Citations and references

Cited by 20 references

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