Fusion of spherical-octupole pairs of colliding nuclei for compact and elongated configurations

• 作者: Shivani Jain Manoj K.Sharma Raj Kumar
• 来源期刊: 中国物理C（英文版）
• 年，卷（期）: 2022,（1）
• 所属期刊栏目: NUCLEAR PHYSICS
• 页码范围: 146-156
• 页数: 11页
• 语种: 英文
• DOI: 10.1088/1674-1137/ac2ed2

摘要

The deformation and associated optimum/uniquely fixed orientations play an important role in the syn-thesis of compound nuclei via cold and hot fusion reactions,respectively,at the lowest and highest barrier energies.The choice of optimum orientation (θopt) for the 'cold or elongated'and 'hot or compact'fusion configurations of quadrupole (β2) deformed nuclei depends only on the +/-signs of β2-deformation[J.Phys.G:Nucl.Part.Phys.31,631-644 (2005)].In our recent study[Phys.Rev.C 101,051601(R) 2020],we proposed a new set of θopt (different from the values reported for quadrupole deformed nuclei) after the inclusion of octupole deformation (up to β3) ef-fects.Using the respective θopt of β3-deformed nuclei for cold and hot optimum orientations,we analyzed the im-pact of the soft-and rigid-pear shapes of octupole deformed nuclei on the fusion barrier characteristics (barrier height VB and barrier position RB).This analysis is applied to approximately 200 spherical-plus-β3 deformed nucle-ar partners,that is,16O,48Ca+octupole deformed nuclei.Compared with the compact configuration,the elongated fu-sion configuration has a relatively larger impact on the fusion barrier and cross-sections owing to the inclusion of de-formations up to β3.Its agreement with available experimental data for the 16O+150Sm reaction (322=0.205,332=-0.055) also improves when the optimum orientation degree of freedom is fixed in view of octupole deformations.This reinforces the fact that nuclear structure effects play an important role in the nuclear fusion process.Thus,octu-pole deformed nuclei can be used for the synthesis of heavy and superheavy nuclei.