Nuclear structure dependence of fusion hindrance in heavy element synthesis

作者：Khuyagbaatar J^*; David H M; Hinde D J; Carter I P; Cook K J; Dasgupta M; Duellmann Ch E; Jeung D Y; Kindler B; Lommel B; Luong D H; Prasad E; Rafferty D C; Sengupta C; Simenel C; Simpson E C; Smith J F; Vo Phuoc K; Walshe J; Wakhle A; Williams E; Yakushev A

来源：PHYSICAL REVIEW C, 2018, 97(6): 064618.

DOI：10.1103/PhysRevC.97.064618

The production of the heaviest elements in fusion-evaporation reactions is substantially limited by very low cross sections, as fusion cross sections (including fusion-fission) are greatly reduced by the competing quasifission mechanism. Using the Australian National University Heavy Ion Accelerator Facility and CUBE detector array, fission fragments from the Ti-48 + Pb-204,Pb-208 and (50T)i + Pb-206,Pb-208 reactions have been measured, with the aim to investigate how the competition between quasifission and fusion-fission evolves with small changes in entrance-channel properties associated mainly with the nuclear structure. Analysis of mass-distribution widths of strongly mass-angle-correlated fission fragments within the framework of the compound-nucleus fission theory demonstrates significant differences in quasifission (and therefore fusion) probabilities among the four reactions. The impact of nuclear structure on fusion highlights the importance of future radioactive beams.

• 出版日期2018-6-28