Angular anisotropy of the fusion-fission and quasifission fragments

2007/05/18 by A. K. Nasirov, A. I. Muminov, R Utamuratov +7 · 6 citations
Physics and Astronomy · #Astronomical and nuclear sciences #Atomic and Molecular Physics #Nuclear physics research studies #nucl-th

paper · pdf · doi:10.1140/epja/i2007-10504-5

published as Eur.Phys.J.A34:325-339,2007 · 17 pages 8 figures. Submitted to Euro. Phys. Jour. A

arxiv created 2007/05/18 · openalex publication_date 2007/12/01 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/29

Abstract

The anisotropy in the angular distribution of the fusion-fission and quasifission fragments for the ¹⁶O+²³⁸U, ¹⁹F+²⁰⁸Pb and ³²S+²⁰⁸Pb reactions is studied by analyzing the angular momentum distributions of the dinuclear system and compound nucleus which are formed after capture and complete fusion, respectively. The orientation angles of axial symmetry axes of colliding nuclei to the beam direction are taken into account for the calculation of the variance of the projection of the total spin onto the fission axis. It is shown that the deviation of the experimental angular anisotropy from the statistical model picture is connected with the contribution of the quasifission fragments which is dominant in the ³²S+²⁰⁸Pb reaction. Enhancement of anisotropy at low energies in the ¹⁶O+²³⁸U reaction is connected with quasifission of the dinuclear system having low temperature and effective moment of inertia.

Cited by

• EXPECTATIONS AND LIMITS TO SYNTHESIZE NUCLEI WITH Z ≥ 120
• Effects of nuclear structure on quasi-fission
• Effects of entrance channels on the deexcitation properties of the same compound nucleus formed by different pairs of collision partners
• Uncertainties and understanding of experimental and theoretical results regarding reactions forming heavy and superheavy nuclei
• Dynamics of dinuclear system formation and its decay in heavy ion collisions
• Effects of the entrance channel and fission barrier in the synthesis of superheavy elementZ=120

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• Disentangling the influence of excitation energy and compound nucleus angular momentum on fission fragment angular momentum