Physics Letters B (Sep 2021)
Sensitive search for near-symmetric and super-asymmetric fusion-fission of the superheavy element Flerovium (Z=114)
- K. Banerjee,
- D.J. Hinde,
- M. Dasgupta,
- J. Sadhukhan,
- E.C. Simpson,
- D.Y. Jeung,
- C. Simenel,
- B.M.A. Swinton-Bland,
- E. Williams,
- L.T. Bezzina,
- I.P. Carter,
- K.J. Cook,
- H.M. Albers,
- Ch.E. Düllmann,
- J. Khuyagbaatar,
- B. Kindler,
- B. Lommel,
- C. Mokry,
- E. Prasad,
- J. Runke,
- N. Schunck,
- C. Sengupta,
- J.F. Smith,
- P. Thörle-Pospiech,
- N. Trautmann,
- K. Vo-Phuoc,
- J. Walshe,
- A. Yakushev
Affiliations
- K. Banerjee
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia; Corresponding author.
- D.J. Hinde
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
- M. Dasgupta
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
- J. Sadhukhan
- Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata-700064, India; Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India
- E.C. Simpson
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
- D.Y. Jeung
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
- C. Simenel
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia; Department of Theoretical Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia
- B.M.A. Swinton-Bland
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
- E. Williams
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
- L.T. Bezzina
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
- I.P. Carter
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
- K.J. Cook
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia; Facility for Rare Isotope Beams, Michigan State University, 640 South Shaw Lane, East Lansing, MI 48824, USA
- H.M. Albers
- SHE Chemistry Department, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- Ch.E. Düllmann
- SHE Chemistry Department, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany; SHE Chemistry Section, Helmholtz Institute Mainz, 55099, Mainz, Germany; Department of Chemistry - TRIGA Site, Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany
- J. Khuyagbaatar
- SHE Chemistry Department, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany; SHE Chemistry Section, Helmholtz Institute Mainz, 55099, Mainz, Germany
- B. Kindler
- Target Laboratory, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- B. Lommel
- Target Laboratory, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany
- C. Mokry
- SHE Chemistry Section, Helmholtz Institute Mainz, 55099, Mainz, Germany
- E. Prasad
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
- J. Runke
- SHE Chemistry Department, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany; Department of Chemistry - TRIGA Site, Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany
- N. Schunck
- Nuclear and Chemical Science Division, Lawrence Livermore National Laboratory, Livermore, CA 94551, USA
- C. Sengupta
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
- J.F. Smith
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
- P. Thörle-Pospiech
- SHE Chemistry Section, Helmholtz Institute Mainz, 55099, Mainz, Germany; Department of Chemistry - TRIGA Site, Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany
- N. Trautmann
- Department of Chemistry - TRIGA Site, Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany
- K. Vo-Phuoc
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
- J. Walshe
- Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia
- A. Yakushev
- SHE Chemistry Department, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany; SHE Chemistry Section, Helmholtz Institute Mainz, 55099, Mainz, Germany
- Journal volume & issue
-
Vol. 820
p. 136601
Abstract
Measurements of mass and angular distributions have been made for fission-like outcomes in reactions forming isotopes of flerovium (Z=114), using 48Ca, 50Ti, and 54Cr projectiles. The dominant fast quasifission process, which masks the presence of fusion-fission, has minimum yield at the most backward angles, where the sensitivity to fusion-fission is thus highest. In fitting the backward angle mass spectra, only weak evidence for a component of super-asymmetric fission was found, but a near-symmetric fission component was consistently required for the 48Ca + 244Pu reaction, giving upper limit to the fusion probabilities PCN of ∼10−2, ∼5 times lower than previous results. PCN for the 50Ti reaction was lower than 48Ca, whilst no evidence of fusion-fission was found for the 54Cr reaction.
