Two-body collision effects on the low-L fusion window in 16O+16O reactions

doi:10.1016/0370-2693(85)91317-6

Physics Letters B

Volume 160, Issues 4–5, 10 October 1985, Pages 235-238

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Abstract

The head-on collision of ¹⁶O+¹⁶O is studied in a phenomenological model for the extended time-dependent Hartree-Fock theory. We find that the low-L fusion window predicted in the time-dependent Hartree-Fock theory disappears with a reasonable relaxation time for two-body collisions.

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Cited by (17)

Heavy-ion collisions and fission dynamics with the time-dependent Hartree–Fock theory and its extensions
2018, Progress in Particle and Nuclear Physics
Citation Excerpt :
These include the time-dependent random phase approximation (TDRPA) approach of Balian and Vénéroni [244], the time-dependent generator coordinate method (TDGCM) [206], and the stochastic mean-field (SMF) method [31]. The effects of two-body dissipation on reactions of heavy systems using the time-dependent density-matrix (TDDM) [245,246] approach have also been recently reported [247–249]. Among the most important observables that are affected by these fluctuations are the widths of nucleon transfer in heavy-ion collisions and fission fragment yields.
Microscopic methods and tools to describe nuclear dynamics have considerably been improved in the past few years. They are based on the time-dependent Hartree–Fock (TDHF) theory and its extensions to include pairing correlations and quantum fluctuations. The TDHF theory is the lowest level of approximation of a range of methods to solve the quantum many-body problem, showing its universality to describe many-fermion dynamics at the mean-field level. The range of applications of TDHF to describe realistic systems allowing for detailed comparisons with experiment has considerably increased. For instance, TDHF is now commonly used to investigate fusion, multi-nucleon transfer and quasi-fission reactions. Thanks to the inclusion of pairing correlations, it has also recently led to breakthroughs in our description of the saddle to scission evolution, and, in particular, the non-adiabatic effects near scission. Beyond mean-field approaches such as the time-dependent random-phase approximation (TDRPA) and stochastic mean-field methods have reached the point where they can be used for realistic applications. We review recent progresses in both techniques and applications to heavy-ion collision and fission.
Search for low-L fusion window in the <sup>16</sup>O + <sup>16</sup>O reaction at 4.5 MeV/nucleon
1988, Nuclear Physics, Section A
The reaction channels other than fusion were investigated for the ¹⁶O + ¹⁶O system at 4.5 MeV per nucleon, by means of coincidence measurements of two oxygen-like fragments, and by angular correlation measurements, in and out of plane, of an alpha particle and an oxygen nucleus. The average spin of the relaxed fragments is compatible with the classical sticking limit, with a strong polarization perpendicular to the reaction plane. This is not compatible with a low-l fusion window.
Enhanced dissipation in new mean-field studies of strongly damped collisions
1987, Physics Letters B
Time-dependent Hartree-Fock (TDHF) calculations have been performed for the ⁸⁶Kr+¹³⁹La system at a laboratory energy of 610 MeV. The effective interaction includes a spin-orbit force. The results are compared with experiment and with previous TDHF studies in which spin currents were not included. The new results shown an overall increase in the amount of dissipation found for strongly damped trajectories including fusion for head-on collisions, a region of negative angle scattering in the deflection function, and enhanced particle transfer for $l ≈ 110 h ̷$ .
Quasifission dynamics in microscopic theories
2020, arXiv
Quasifission Dynamics in Microscopic Theories
2020, Frontiers in Physics
Heavy-ion collisions and fission dynamics with the time-dependent Hartree-Fock theory and its extensions
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^☆: Supported by BMFT and GSI.

^∗: I would like to thank Professor U. Mosel for valuable comments and for a critical reading of the manuscript. I am grateful to Dr. K.T.R. Davies for providing me with his TDHF code. Useful discussions with Dr. W. Cassing are acknowledged.

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Two-body collision effects on the low-L fusion window in 16O+16O reactions☆

Abstract

Phys. Rev.

Phys. Rev.

Phys. Rev.

Z. Phys.

Phys. Lett.

Rev. Mod. Phys.

Phys. Rev. L

Phys. Rev. Lett.

Phys. Rev. Lett.

Phys. Rev. Lett.

Nucl. Phys.

Phys. Lett.

Nucl. Phys.

Two-body collision effects on the low-L fusion window in ¹⁶O+¹⁶O reactions☆