Probing Optimal Reaction Energy for Synthesis of Element 119 from <sup>51</sup>V+<sup>248</sup>Cm Reaction with Quasielastic Barrier Distribution Measurement
M. Tanaka, P. Brionnet, Miting Du, Julie Ezold, Kevin Felker, Б. Галл, S. Go, R. Grzywacz, Hiromitsu Haba, K. Hagino, Susan Hogle, Satoshi Ishizawa, D. Kaji, Sota Kimura, T. King, Yukiko Komori, Raiden K. Lemon, Milan G. Leonard, K. Morimoto, Kosuke Morita, D. Nagae, Natsuki Naito, T. Niwase, B. C. Rasco, J. B. Roberto, K. P. Rykaczewski, S. Sakaguchi, H. Sakai, Yudai Shigekawa, D. W. Stracener, Shelley VanCleve, Yang Wang, Kouhei Washiyama, Takuya Yokokita
Abstract
Here, the quasielastic barrier distribution of <sup>51</sup>V+<sup>248</sup>Cm was extracted by measuring the excitation function of quasielastic backscattering using a gas-filled recoil ion separator, GARIS-III. The obtained barrier distribution is well explained by the coupled-channels calculation, indicating a significant effect of the rotational excitation of deformed <sup>248</sup>Cm. From the measured average Coulomb barrier height and deformation parameters of <sup>248</sup>Cm, the side-collision energy leading to a compact configuration of colliding nuclei was obtained. The relation between the side collision energy and the excitation function of the evaporation-residue cross sections in the <sup>48</sup>Ca+<sup>248</sup>Cm system was evaluated as a reference for the <sup>51</sup>V+<sup>248</sup>Cm case. The optimal reaction energy to synthesize a new element 119 at the <sup>51</sup>V+<sup>248</sup>Cm fusion reaction (3n and 4n channels) was estimated with an aid of these experimental data.