학술논문
Zeptosecond contact times for element Z=120 synthesis
Document Type
article
Author
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
Source
Physics Letters B, Vol 808, Iss , Pp 135626- (2020)
Subject
Language
English
ISSN
0370-2693
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.