Predominant Time Scales in Fission Processes in Reactions of S, Ti and Ni with W: Zeptosecond versus Attosecond

Rietz, R. du; Hinde, David; Dasgupta, M.; Thomas, R. G.; Gasques, L. R.; Evers, M.; Lobanov, Nikolai R.; Wakhle, A.

doi:10.1103/physrevlett.106.052701

Cited by 112 publications

(151 citation statements)

References 24 publications

(32 reference statements)

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“…[3] MAD Ref. [22] Fig These values are plotted in Fig. 9 as a function of the total charge of the system Z C.N.…”

Section: Comparison Of Resultsmentioning

confidence: 99%

“…To compare with the blocking results, MAD were measured in Ref. [22] for the reactions of 34 S+ 186 W, 48 Ti+ 186 W and 64 Ni+ 184 W for a range of similar beam energies. These are shown in Fig.…”

Section: Comparison Of Resultsmentioning

confidence: 99%

“…To obtain quantitative reaction time scales for this dominant quasi-fission process, a classical Monte Carlo model was developed [22] to simulate quasi-fission MAD. The quasi-fission sticking time distributions were parameterized using a half Gaussian followed by an exponential decay.…”

Section: Comparison Of Resultsmentioning

confidence: 99%

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Fusion and quasi-ﬁssion in the formation of heavy elements

Hinde

Rietz

Dasgupta

2011

EPJ Web of Conferences

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“…[3] MAD Ref. [22] Fig These values are plotted in Fig. 9 as a function of the total charge of the system Z C.N.…”

Section: Comparison Of Resultsmentioning

confidence: 99%

Section: Comparison Of Resultsmentioning

confidence: 99%

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Fusion and quasi-ﬁssion in the formation of heavy elements

Hinde

Rietz

Dasgupta

2011

EPJ Web of Conferences

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“…Although this approach has been widely used, it could have limitations due to the fact that quasifission is not a statistical decay but a dynamical process, and that fusion-fission could be asymmetric due to, e.g., late-chance fusion-fission at low excitation energies [28] as well as shell structure of pre-scission configurations [29]. Correlations between mass and scattering angle of the fragments have also been measured extensively [25,[30][31][32][33]. In particular, they can be used to disentangle fast quasi-fission processes (few zeptoseconds) to longer reaction mechanisms associated with contact times between the fragments exceeding 10 − 20 zs (i.e., long-time quasifission and fusion-fission).…”

Section: Introductionmentioning

confidence: 99%

“…In particular, they can be used to disentangle fast quasi-fission processes (few zeptoseconds) to longer reaction mechanisms associated with contact times between the fragments exceeding 10 − 20 zs (i.e., long-time quasifission and fusion-fission). However, the analysis of such fragment mass-angle distributions [30,31], as well as statistical descriptions of fragment angular distributions [26], require external parameters such as moment of inertia and temperature which are chosen somewhat arbitrarily [21,26,34]. It is therefore important to provide realistic evaluation of these parameters, in particular for the quasifission mechanism which requires a description of the complex nuclear dynamics.…”

Section: Introductionmentioning

confidence: 99%

Shape evolution and collective dynamics of quasifission in the time-dependent Hartree-Fock approach

2015

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Background: At energies near the Coulomb barrier, capture reactions in heavy-ion collisions result either in fusion or in quasifission. The former produces a compound nucleus in statistical equilibrium, while the second leads to a reseparation of the fragments after partial mass equilibration without formation of a compound nucleus. Extracting the compound nucleus formation probability is crucial to predict superheavy-element formation crosssections. It requires a good knowledge of the fragment angular distribution which itself depends on quantities such as moments of inertia and excitation energies which have so far been somewhat arbitrary for the quasifission contribution.Purpose: Our main goal is to utlize the time-dependent Hartee-Fock (TDHF) approach to extract ingredients of the formula used in the analysis of experimental angular distributions. These include the moment-of-inertia and temperature.Methods: We investigate the evolution of the nuclear density in TDHF calculations leading to quasifission. We study the dependence of the relevant quantities on various initial conditions of the reaction process.Results: The evolution of the moment of inertia is clearly non-trivial and depends strongly on the characteristics of the collision. The temperature rises quickly when the kinetic energy is transformed into internal excitation. Then, it rises slowly during mass transfer.Conclusions: Fully microscopic theories are useful to predict the complex evolution of quantities required in macroscopic models of quasifission.

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From Light to Hyper-heavy Molecules and Neutron-Star Crusts in a Dynamical Mean-Field Approach

Simenel

2014

Clusters in Nuclei, Volume 3

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The richness of phenomena occurring in heavy-ion collisions calls for microscopic approaches where the motion of each nucleon is treated quantum mechanically. The most popular microscopic approach for low-energy collisions between atomic nuclei is the time-dependent Hartree-Fock (TDHF) theory, providing a mean-field dynamics of the system. The TDHF approach and some of its extensions are used to predict the evolution of out-of-equilibrium nuclear systems. The formation of di-nuclear systems with a structure close to molecular states is investigated. In particular, lifetimes and exit channels are described. The formation of light molecules and the dynamics of α-clustering are discussed. Di-nuclear systems formed in transfer, deep-inelastic, and quasi-fission reactions, as well as hyperheavy molecules produced in reactions between actinides are also investigated. The formation and stability of structures in neutron star crusts are finally discussed.

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Predominant Time Scales in Fission Processes in Reactions of S, Ti and Ni with W: Zeptosecond versus Attosecond

Cited by 112 publications

References 24 publications

Fusion and quasi-ﬁssion in the formation of heavy elements

Fusion and quasi-ﬁssion in the formation of heavy elements

Shape evolution and collective dynamics of quasifission in the time-dependent Hartree-Fock approach

From Light to Hyper-heavy Molecules and Neutron-Star Crusts in a Dynamical Mean-Field Approach

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