Sensitive search for near-symmetric and super-asymmetric fusion-fission of the superheavy element Flerovium (Z=114)

Banerjee, K.; Hinde, D. J.; Dasgupta, M.; Sadhukhan, J.; Simpson, E. C.; Jeung, D. Y.; Simenel, C.; Swinton-Bland, B. M.A.; Williams, E.; Bezzina, L. T.; Carter, I. P.; Cook, K. J.; Albers, H. M.; Düllmann, Ch E.; Khuyagbaatar, J.; Kindler, B.; Lommel, B.; Mokry, C.; Prasad, E.; Runke, J.; Schunck, N.; Sengupta, C.; Smith, J. F.; Thörle-Pospiech, P.; Trautmann, N.; Vo-Phuoc, K.; Walshe, J.; Yakushev, A.

doi:10.1016/j.physletb.2021.136601

Title: Sensitive search for near-symmetric and super-asymmetric fusion-fission of the superheavy element Flerovium (Z=114)

Journal Article · 25 August 2021 · Physics Letters. B

DOI: https://doi.org/10.1016/j.physletb.2021.136601 · OSTI ID:1860837

^[1]; Hinde, D. J. ^[1]; Dasgupta, M. ^[1]; Sadhukhan, J. ^[2];

^[1]; Jeung, D. Y. ^[1]; Simenel, C. ^[1];

^[1];

^[1]; Cook, K. J. ^[3];

^[4];

^[5]; Khuyagbaatar, J. ^[6]; Kindler, B. ^[4];

^[4]; Mokry, C. ^[7]; Prasad, E. ^[1]; Runke, J. ^[8] more »

The Australian National University, Canberra, ACT (Australia)
Variable Energy Cyclotron Centre, Kolkata (India); Homi Bhabha National Institute, Mumbai (India)
The Australian National University, Canberra, ACT (Australia); Michigan State Univ., East Lansing, MI (United States)
GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Helmholz Institute Mainz (Germany); Johannes Gutenberg Univ., Mainz (Germany)
GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Helmholz Institute Mainz (Germany)
Helmholz Institute Mainz (Germany)
GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany); Johannes Gutenberg Univ., Mainz (Germany)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Helmholz Institute Mainz (Germany); Johannes Gutenberg Univ., Mainz (Germany)
Johannes Gutenberg Univ., Mainz (Germany)

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 P_CN of ~10^-2, ~5 times lower than previous results. P_CN for the ⁵⁰Ti reaction was lower than ⁴⁸Ca, whilst no evidence of fusion-fission was found for the ⁵⁴Cr reaction.

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-07NA27344

OSTI ID:: 1860837

Report Number(s):: LLNL-JRNL-832608; 1050286

Journal Information:: Physics Letters. B, Journal Name: Physics Letters. B Journal Issue: N/A Vol. 820; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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