Статья

Mechanisms Suppressing Superheavy Element Yields in Cold Fusion Reactions

K. BanerjeeDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaD. J. HindeDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaM. DasguptaDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaE. C. SimpsonDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaD. Y. JeungDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaC. SimenelDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaB. M. A. Swinton-BlandDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaE. WilliamsDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaI. P. CarterDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaK. J. CookDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaH. M. DavidGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyCh. E. DüllmannGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyJ. KhuyagbaatarGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyB. KindlerGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyB. LommelGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, GermanyE. PrasadDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaC. SenguptaDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaJ. F. SmithDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaK. Vo-PhuocDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaJ. WalsheDepartment of Nuclear Physics, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, AustraliaA. YakushevGSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany

2019en

ABI

Аннотация

Superheavy elements are formed in fusion reactions which are hindered by fast nonequilibrium processes. To quantify these, mass-angle distributions and cross sections have been measured, at beam energies from below-barrier to 25% above, for the reactions of ^{48}Ca, ^{50}Ti, and ^{54}Cr with ^{208}Pb. Moving from ^{48}Ca to ^{54}Cr leads to a drastic fall in the symmetric fission yield, which is reflected in the measured mass-angle distribution by the presence of competing fast nonequilibrium deep inelastic and quasifission processes. These are responsible for reduction of the compound nucleus formation probablity P_{CN} (as measured by the symmetric-peaked fission cross section), by a factor of 2.5 for ^{50}Ti and 15 for ^{54}Cr in comparison to ^{48}Ca. The energy dependence of P_{CN} indicates that cold fusion reactions (involving ^{208}Pb) are not driven by a diffusion process.

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Идентификаторы

DOI: 10.1103/physrevlett.122.232503

Цитирования и источники

Цитирований: 3Использованных источников: 0

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