Multinucleon transfer in central collisions of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">U</mml:mi><mml:mprescripts /><mml:none /><mml:mn>238</mml:mn></mml:mmultiscripts><mml:mo>+</mml:mo><mml:mmultiscripts><mml:mi mathvariant="normal">U</mml:mi><mml:mprescripts /><mml:none /><mml:mn>238</mml:mn></mml:mmultiscripts></mml:math>

Ayık, S.; Yilmaz, B.; Yılmaz, O.; Umar, A. S.; Turan, Gürsevil

doi:10.1103/physrevc.96.024611

Cited by 45 publications

(36 citation statements)

References 59 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…An important message here is that those IQF processes emerge as a main reaction outcome in TDHF. Since larger effects of fluctuations and correlations, that give rise to a wider fragment mass distribution, are expected in such damped collisions [106,[141][142][143], novel IQF processes may pave new pathways to unexplored territories in the nuclear chart far away from the stability.…”

Section: B Quasifission Processesmentioning

confidence: 99%

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

Sekizawa

2019

Front. Phys.

View full text Add to dashboard Cite

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]).

show abstract

Section: B Quasifission Processesmentioning

confidence: 99%

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

Sekizawa

2019

Front. Phys.

View full text Add to dashboard Cite

show abstract

“…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

Self Cite

View full text Add to dashboard Cite

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.

show abstract

“…However, since the dynamical fluctuation and two-body dissipation are not included in TDHF, the fluctuations of collective variables are found to be considerably underestimated [79,80]. To remedy the limitations in TDHF, the extension of theoretical framework beyond TDHF has been developed to include these effects, e.g., stochastic extension of TDHF theory [68,[81][82][83][84][85], Balian-Vénéroni variational approach [80,86,87], time-dependent density matrix approach [88,89], time-dependent generator coordinate method [90,91].…”

Section: Introductionmentioning

confidence: 99%

Microscopic studies of production cross sections in multinucleon transfer reaction Ni58+Sn124

Guo

2019

Phys. Rev. C

View full text Add to dashboard Cite

Background: Multinucleon transfer reaction at low-energy collisions is considered to be a promising method for the production of new exotic nuclei, which are difficult to be produced by other methods. The theoretical studies are required to provide reliable predictions for the experiments and promote the understanding of the microscopic mechanism in multinucleon transfer reactions. Purpose: We provide a predictive approach for production cross sections, and testify how and to what extent the microscopic approach works well in multinucleon transfer reaction. Methods: We employ the approach TDHF+GEMINI, which combines the microscopic time-dependent Hartree-Fock (TDHF) with the state-of-art statistical model GEMINI++, to take into account both the multinucleon transfer dynamics and the secondary deexcitation process. The properties of primary products in multinucleon transfer process, such as transfer probabilities and primary cross sections, are extracted from TDHF dynamics by using the particle-number projection method. Production cross sections for secondary products are evaluated by using the statistical model GEMINI++.Results: We investigate the influence of colliding energies and deformation orientations of target and projectile nuclei on multinucleon transfer dynamics in the reaction 58 Ni+ 124 Sn. More nucleons are observed to transfer in the tip collision as compared to the side collision. The production cross sections for secondary fragments with TDHF+GEMINI calculations well reproduce the experimental measurements at energies close to the Coulomb barrier. At sub-barrier energy, the theoretical results gradually deviate from the experimental data as the increase of the number of transferred neutrons, implying the limitations of a single mean-field approximation in TDHF approach. Possible origins for this discrepancy are discussed. The total cross sections integrated over all the neutron pickup channels are in good agreement with the experimental data for all the energies. We compare the production cross sections of TDHF+GEMINI calculations with those from GRAZING model, and find that our approach gives a quantitatively good description as the semiclassical model, although there is no adjustable parameters for the reaction dynamics in the microscopic TDHF method. Conclusions: The microscopic approach TDHF+GEMINI reasonably reproduces the experimental data at energies close to the Coulomb barrier and well accounts for the multinucleon transfer mechanism. The present studies clearly reveal the applicability of TDHF+GEMINI method in multinucleon transfer reactions, which thus deserves as a promising tool to predict the properties of new reactions. * luguo@ucas.ac.cn hance the yield of exotic nuclei for an appropriate projectiletarget combination. To produce the new unstable isotopes experimentally, the optimal incident energy and projectile-target combination should be chosen to have the highest product cross section for the desired isotope. The reliable theoretical predictions are therefore required to guide ...

show abstract

Multinucleon transfer in central collisions of U238+U238

Cited by 45 publications

References 59 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

Deformed shell effects in Ca48+Bk249 quasifission fragments

Microscopic studies of production cross sections in multinucleon transfer reaction Ni58+Sn124

Contact Info

Product

Resources

About