Angular momentum dependence of quasifission dynamics in the reaction 48Ca+244Pu

Chong, Yu; Guo, Lu

doi:10.1007/s11433-017-9063-3

Cited by 28 publications

(21 citation statements)

References 83 publications

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“…TDHF is notably versatile-by changing initial condition, external potential, boundary condition, etc., one can study a wide variety of phenomena: not only collective excitations in the linear response regime [40][41][42][43][44][45][46][47][48], where TDHF is formally equivalent to the random phase approximation (RPA), but also induced fission [49][50][51][52][53][54], dynamics of exotic configurations like α-chain structure [55], toroidal nucleus [56,57], nuclear pasta formation [58][59][60][61], as well as heavy-ion reactions, such as nucleon transfer [62][63][64][65][66][67][68][69][70][71][72][73][74][75], quasifission (QF) [76][77][78][79][80][81][82][83][84][85][86]…”

Section: The Tdhf Theorymentioning

confidence: 99%

TDHF Theory and Its Extensions for the Multinucleon Transfer Reaction: A Mini Review

Sekizawa

2019

Front. Phys.

106

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Time-dependent Hartree-Fock (TDHF) theory has been a powerful tool in describing a variety of complex nuclear dynamics microscopically without empirical parameters. In this contribution, recent advances in nuclear dynamics studies with TDHF and its extensions are briefly reviewed, along the line with the study of multinucleon transfer (MNT) reactions. The latter lies at the core of this Research Topic, whose application for production of extremely neutron-rich nuclei has been extensively discussed in recent years. Having in mind the ongoing theoretical developments, it is envisaged how microscopic theories may contribute to the future MNT study. 1 Here a local EDF (like Skyrme) has been assumed, which makes the TDHF equations (1) local in space, as it is currently used in most of practical applications. In general, E = E(r)dr is composed of various local densities, ξ ≡ {ρ, τ, . . . }, and the TDHF equations (1)In such a case, the single-particle Hamiltonian can have spin dependence as well as differential operators (for the explicit form, see, e.g., Refs. [27][28][29]).

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Section: The Tdhf Theorymentioning

confidence: 99%

TDHF Theory and Its Extensions for the Multinucleon Transfer Reaction: A Mini Review

Sekizawa

2019

Front. Phys.

106

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“…Applications of time-dependent microscopic methods to quasi-fission has also attracted lots of efforts in the past few years [107,200,[210][211][212][213][214][215][216][217][218]. Quasi-fission is a mechanism in which two fragments are emitted after capture and before the formation of a fully equilibrated compound nucleus could be achieved [219].…”

Section: Applications To Quasi-fissionmentioning

confidence: 99%

Heavy-ion collisions and fission dynamics with the time-dependent Hartree–Fock theory and its extensions

Simenel

Umar

2018

Progress in Particle and Nuclear Physics

170

103

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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 manyfermion 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 meanfield 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. Introduction: nuclear quantum many-body dynamicsThe quantum many-body problem is vital to many areas of physics. Indeed, the description of complex quantum objects of interacting particles is of interests for many physical systems, from quarks and gluons in a nucleon to macromolecules, such as fullerenes, to Bose-Einstein condensates. Consequently, major developments in the description of quantum many-body systems are often of interest to many different fields. For instance, the BCS theory introduced to describe superconductivity [1] is also widely used in nuclear physics to incorporate the effect of pairing correlations. Similarly, the tools used to study low-energy fusion with multi-channel tunneling [2] are also used to describe dissociative adsorption of molecules on a surface [3].The similarity between dynamical processes in quantum many-body systems, whether their constituents are nucleons, electrons, or atoms, is quite striking. It is possible to make such systems vibrate, rotate, fuse, transfer particles, fission and break up. This is of course true for nuclear systems, where each of these processes can be used to learn about specific aspects of quantum many-body dynamics. For instance, the study of nuclear vibrations tells us how single-particles can produce collective motion, what is its interplay with the underlying shell structure, what are the source of non-linearities leading to anharmonicities, and how collective modes get damped and decay. These concepts and many others can also be studied via heavy-ion collisions:1 In the case of a time-independent Hamiltonian, we haveF H (t) = e iĤt/ F e −iĤt/ . 2 Of course, nucleons are indistinguishable fermions and there is no guarantee that the nucleon which is annihilated is the same as the one which is created. In fact, the question of "which one" is created or a...

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“…This includes classical methods such as a transport model [34], the dinuclear system model [35][36][37][38], and models based on the Langevin equation [39][40][41][42][43]. Microscopic approaches such as quantum molecular dynamics [44][45][46] and the time-dependent Hartree-Fock (TDHF) theory [17,18,32,43,[47][48][49][50][51][52][53][54][55][56][57] have also been used. See [58][59][60][61] for recent reviews on TDHF.An advantage of microscopic calculations is that their only inputs are the parameters of the energy density functional describing the interaction between the nucleons.…”

mentioning

confidence: 99%

Deformed shell effects in Ca48+Bk249 quasifission fragments

2019

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Background: Quasifission is the main reaction channel hindering the formation of superheavy nuclei (SHN). Its understanding will help to optimize entrance channels for SHN studies. Quasifission also provides a probe to understand the influence of shell effects in the formation of the fragments. Purpose: Investigate the role of shell effects in quasifission and their interplay with the orientation of the deformed target in the entrance channel. Methods: 48 Ca+ 249 Bk collisions are studied with the time-dependent Hartree-Fock approach for a range of angular momenta and orientations. Results: Unlike similar reactions with a 238 U target, no significant shell effects which could be attributed to 208 Pb "doubly-magic" nucleus are found. However, the octupole deformed shell gap at N = 56 seems to strongly influence quasifission in the most central collisions.Conclusions: Shell effects similar to those observed in fission affect the formation of quasifission fragments. Mass-angle correlations could be used to experimentally isolate the fragments influenced by N = 56 octupole shell gaps.On the theory side, quasifission has been studied with various approaches. This includes classical methods such as a transport model [34], the dinuclear system model [35][36][37][38], and models based on the Langevin equation [39][40][41][42][43]. Microscopic approaches such as quantum molecular dynamics [44][45][46] and the time-dependent Hartree-Fock (TDHF) theory [17,18,32,43,[47][48][49][50][51][52][53][54][55][56][57] have also been used. See [58][59][60][61] for recent reviews on TDHF.An advantage of microscopic calculations is that their only inputs are the parameters of the energy density functional describing the interaction between the nucleons. Since these parameters are usually fitted on nuclear structure properties only, such calculations do not require additional parameters determined from reaction mechanisms, such as nucleus-nucleus potentials. In addition, TDHF calculations treat both reaction mechanisms and structure properties on the same footing. This is important for reactions with actinide targets which exhibit a strong quadrupole deformation.

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Angular momentum dependence of quasifission dynamics in the reaction 48Ca+244Pu

Cited by 28 publications

References 83 publications

TDHF Theory and Its Extensions for the Multinucleon Transfer Reaction: A Mini Review

TDHF Theory and Its Extensions for the Multinucleon Transfer Reaction: A Mini Review

Heavy-ion collisions and fission dynamics with the time-dependent Hartree–Fock theory and its extensions

Deformed shell effects in Ca48+Bk249 quasifission fragments

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