Publisher's Note: Fusion-fission and quasifission of superheavy systems withZ=110–116formed inCa48-induced reactions [Phys.

Experiments on the synthesis of superheavy nucleiFl284andFl285in thePuUtyonkov1, Brewer2, Oganessian3 et al. 2015Phys. Rev. CSelf Cite1007452View full textAdd to dashboardCite

“…Note that this model, describing the dynamics of capture of the interacting nuclei, formation of an excited compound nucleus, and its final cooling down by the emission of neutrons and γ rays, reasonably accurately reproduces the Data from DGFRS [14,34] In this model [32], the capture cross section and fusion probability vary weakly over a rather large range of reactions leading to nuclei with Z CN =112-118. Indeed, capture cross sections are comparable for the 238 U-249 Cf+ 48 Ca reactions [12], which are also in agreement with experimental data [36], and fusion probability slightly decreases for heavier target nuclei [12]. Thus, the resulting total ER cross section substantially depends on the survival probability of the excited compound nucleus which is determined mainly by the difference between the fission-barrier height and neutron binding energy of the nuclei for each step of sequential neutron emission.…”

Nuclear fission: a review of experimental advances and phenomenology

“…• Flerov Laboratory for Nuclear Reactions (FLNR) in Dubna, Russia, using the CORSET setup [135,136,137,138,139,140,141,142,143,144,145,146,35], • 15UD Pelletron at the Inter University Accelerator Centre (IUAC) in New Delhi, India [147,148,149,150,151,152,153,154,155,156,157,158,159] • Pelletron LINAC facility in collaboration between BARC (Bhabha Atomic Research Centre) and Tata Institute of Fundamental Research (TIFR) in Mumbai, India [160] In the following, selected examples of applied techniques are presented in some details.…”

“…Figures 61(d) and (c) reveal the difference between the actinide-based reaction 48 Ca+ U→ Cn * and the cold-fusion reaction 48 Ca+ 208 Pb → 256 No * .T h e latter exploits the spherical 48 Ca and 208 Pb nuclei, thus no orientation effect is expected. Indeed, despite having a value Z p ×Z t = 1690, the reaction 48 Ca+ 208 Pb shows a single Gaussian-shape FFMD [379,380,145], typical for the CN fission. On the contrary, the reaction 48 Ca+ 238 U( Z p ×Z t = 1840) is dominated by quasifission, with no clear evidence for the CN-like fission seen in the middle of the plot.…”

“…A c c e p t e d M a n u s c r i p t (Color online) Mass-energy distributions of fission fragments in the 48 Ca-induced reactions with the targets of (a) spherical 144 Sm (Zp ×Zt=1240), (b) deformed 154 Sm (1240), (c) spherical 208 Pb (1640), and (d) deformed 238 U (1840). Figure is taken from[145]. The peak in the middle of each panel is due to the fusion-fission of excited fully equilibrated CN, while the two strong peaks on the left-and right-hand sides are due to the scattered beam and target nuclei.…”

Characterizing the mechanism(s) of heavy element synthesis reactions

“…This formula describes the extensive data of Knyazheva et al [27] for the 48 Ca + 154 Sm reaction very well [10]. A generalization of this formula has been used to describe the excitation energy dependence of P CN for the reactions of 48 Ca with 238 U, 244 Pu, and 248 Cm [28].…”