Probing Optimal Reaction Energy for Synthesis of Element 119 from ⁵¹V+²⁴⁸Cm Reaction with Quasielastic Barrier Distribution Measurement

Here, the quasielastic barrier distribution of ⁵¹V+²⁴⁸Cm 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 ²⁴⁸Cm. From the measured average Coulomb barrier height and deformation parameters of ²⁴⁸Cm, 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 ⁴⁸Ca+²⁴⁸Cm system was evaluated as a reference for the ⁵¹V+²⁴⁸Cm case. The optimal reaction energy to synthesize a new element 119 at the ⁵¹V+²⁴⁸Cm fusion reaction (3n and 4n channels) was estimated with an aid of these experimental data.

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