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

Physics Letters B

D.J. Hinde¹  J. Runke²  A. Yakushev²  L.T. Bezzina³  B. Kindler⁴  D.Y. Jeung⁵  C. Sengupta⁶  E. Prasad⁶  Ch.E. Düllmann⁷  E. Williams⁷  K. Vo-Phuoc⁷  I.P. Carter⁷  K. Banerjee⁷  K.J. Cook⁷  J. Sadhukhan⁷  M. Dasgupta⁷  H.M. Albers⁷  B.M.A. Swinton-Bland⁷  C. Simenel⁷  J. Khuyagbaatar⁷  J. Walshe⁸  N. Schunck⁸  B. Lommel⁸  C. Mokry⁸  N. Trautmann⁹  P. Thörle-Pospiech^1,10  J.F. Smith^1,10  E.C. Simpson^1,11 

[1] Corresponding author.;Department of Chemistry - TRIGA Site, Johannes Gutenberg-Universität Mainz, 55099, Mainz, Germany;Department of Theoretical Physics, Research School of Physics, Australian National University, Canberra, ACT 2601, Australia;Facility for Rare Isotope Beams, Michigan State University, 640 South Shaw Lane, East Lansing, MI 48824, USA;Homi Bhabha National Institute, Anushakti Nagar, Mumbai 400094, India;SHE Chemistry Section, Helmholtz Institute Mainz, 55099, Mainz, Germany;Department of Nuclear Physics, Research School of Physics, The Australian National University, Canberra, ACT 2601, Australia;SHE Chemistry Department, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany;SHE Chemistry Section, Helmholtz Institute Mainz, 55099, Mainz, Germany;Target Laboratory, GSI Helmholtzzentrum für Schwerionenforschung, 64291 Darmstadt, Germany;Variable Energy Cyclotron Centre, 1/AF, Bidhan Nagar, Kolkata-700064, India;

关键词: Superheavy element;    Nuclear fission dynamics;    Microscopic model calculations;   

DOI  :  

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown