Physics Letters B (Sep 2020)
Zeptosecond contact times for element Z=120 synthesis
- H.M. Albers,
- J. Khuyagbaatar,
- D.J. Hinde,
- I.P. Carter,
- K.J. Cook,
- M. Dasgupta,
- Ch.E. Düllmann,
- K. Eberhardt,
- D.Y. Jeung,
- S. Kalkal,
- B. Kindler,
- N.R. Lobanov,
- B. Lommel,
- C. Mokry,
- E. Prasad,
- D.C. Rafferty,
- J. Runke,
- K. Sekizawa,
- C. Sengupta,
- C. Simenel,
- E.C. Simpson,
- J.F. Smith,
- P. Thörle-Pospiech,
- N. Trautmann,
- K. Vo-Phuoc,
- J. Walshe,
- E. Williams,
- A. Yakushev
Affiliations
- H.M. Albers
- GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany; Corresponding author.
- J. Khuyagbaatar
- GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany; Helmholtz Institute Mainz, 55099, Mainz, Germany
- D.J. Hinde
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- I.P. Carter
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- K.J. Cook
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- M. Dasgupta
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- Ch.E. Düllmann
- GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany; Helmholtz Institute Mainz, 55099, Mainz, Germany; Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany
- K. Eberhardt
- Helmholtz Institute Mainz, 55099, Mainz, Germany; Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany
- D.Y. Jeung
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- S. Kalkal
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- B. Kindler
- GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany
- N.R. Lobanov
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- B. Lommel
- GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany
- C. Mokry
- Helmholtz Institute Mainz, 55099, Mainz, Germany; Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany
- E. Prasad
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- D.C. Rafferty
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- J. Runke
- GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany
- K. Sekizawa
- Center for Transdisciplinary Research, Institute for Research Promotion, Niigata University, Niigata 950-2181, Japan; Division of Nuclear Physics, Center for Computational Sciences, University of Tsukuba, Ibaraki 305-8577, Japan
- C. Sengupta
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- C. Simenel
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia; Department of Theoretical Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- E.C. Simpson
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- J.F. Smith
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- P. Thörle-Pospiech
- Helmholtz Institute Mainz, 55099, Mainz, Germany; Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany
- N. Trautmann
- Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany
- K. Vo-Phuoc
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- J. Walshe
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- E. Williams
- Department of Nuclear Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- A. Yakushev
- GSI Helmholtzzentrum für Schwerionenforschung, 64291, Darmstadt, Germany
- Journal volume & issue
-
Vol. 808
p. 135626
Abstract
The synthesis of new superheavy elements beyond oganesson (Z=118) requires fusion reactions with projectile nuclei with proton numbers larger than that of 48Ca (Z=20), which has been successfully employed for the synthesis of elements with Z=112-118. In such reactions, fusion is drastically hindered by fast non-equilibrated dynamical processes. Attempts to produce nuclei with Z=120 using the 64Ni+238U, 58Fe+244Pu, 54Cr+248Cm, and 50Ti+249Cf reactions have been made, which all result in larger Coulomb forces than for 48Ca-induced reactions, but no discovery has been confirmed to date. In this work, mass and angle distributions of fission fragments from these reactions have been measured with large angular coverage to aid in selection of the most promising projectile-target combination that would favor fusion. The results yield information on reaction contact times, with the longest exhibited by 50Ti+249Cf.
