Fusion probabilities in the reactions<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mrow><mml:mn>40</mml:mn><mml:mo>,</mml:mo><mml:mn>48</mml:mn></mml:mrow></mml:msup></mml:math>Ca+<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>238</mml:mn></mml:msup></mml:math>U at energies around the Coulomb barrier

Nishio, K.; Mitsuoka, S.; Nishinaka, I.; Makii, H.; Wakabayashi, Y.; Ikezoe, H.; Hirose, K.; Ohtsuki, T.; Aritomo, Y.; Hofmann, S.

doi:10.1103/physrevc.86.034608

Cited by 84 publications

(68 citation statements)

References 22 publications

(43 reference statements)

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“…The quasi-fission contact times are also long enough to enable the conversion of the initial relative kinetic energy in to internal excitations. Experimentally, the measured total kinetic energy (TKE) of the quasi-fission fragments in 40,48 Ca+ 238 U reactions is in relatively good agreement with the Viola systematics [12,18]. The TDHF approach contains one-body dissipation mechanisms which are dominant at near-barrier energy.…”

Section: Pb Targets Ormentioning

confidence: 51%

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Dissipative dynamics in quasifission

Oberacker¹,

Umar²,

Simenel³

2014

Phys. Rev. C

110

158

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Section: Pb Targets Ormentioning

confidence: 51%

“…Many experimental studies have been performed to understand the mechanisms at play in the quasi-fission process since its discovery [11][12][13][14][15][16][17][18][19]. Various theoretical models [20][21][22] have also been developed to help in the interpretation of these experimental data.…”

Section: Pb Targets Ormentioning

confidence: 99%

Dissipative dynamics in quasifission

Oberacker¹,

Umar²,

Simenel³

2014

Phys. Rev. C

110

158

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“…This behavior indicates the effect of the quantum shells of 208 Pb. We note that influence of quantum shells in QF processes has been routinely observed experimentally [66][67][68][69][70][71][72] and discussed theoretically [10, 12, 28-30, 57, 73-76].…”

Section: Tdhf Resultsmentioning

confidence: 75%

Time-dependent Hartree-Fock calculations for multinucleon transfer and quasifission processes in theNi64+U238reaction

2016

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Background: Multinucleon transfer (MNT) and quasifission (QF) processes are dominant processes in lowenergy collisions of two heavy nuclei. They are expected to be useful to produce neutron-rich unstable nuclei. Nuclear dynamics leading to these processes depends sensitively on nuclear properties such as deformation and shell structure.Purpose: We elucidate reaction mechanisms of MNT and QF processes involving heavy deformed nuclei, making detailed comparisons between microscopic time-dependent Hartree-Fock (TDHF) calculations and measurements for the 64 Ni+ 238 U reaction.Methods: Three-dimensional Skyrme-TDHF calculations are performed. Particle-number projection method is used to evaluate MNT cross sections from the TDHF wave function after collision.Results: Fragment masses, total kinetic energy (TKE), scattering angle, contact time, and MNT cross sections are investigated for the 64 Ni+ 238 U reaction. They show reasonable agreements with measurements. At small impact parameters, collision dynamics depends sensitively on the orientation of deformed 238 U. In tip (side) collisions, we find a larger (smaller) TKE and a shorter (longer) contact time. In tip collisions, we find a strong influence of quantum shells around 208 Pb.Conclusions: It is confirmed that the TDHF calculations reasonably describe both MNT and QF processes in the 64 Ni+ 238 U reaction. Analyses of this system indicate the significance of the nuclear structure effects such as deformation and quantum shells in nuclear reaction dynamics at low energies.

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“…Layers of 232 Th, 238 U, 244 Pu, and 248 Cm, 180-220 μg/cm 2 thick, deposited on a 40-50 μg/cm 2 carbon backing, were used as targets. The 248 Cm target (125 μg/cm 2 ) was sputtered on 27 Al backing (20 μg/cm 2 ) and covered on both sides by carbon 12 C (40 μg/cm 2 ). The enrichment was 99.99%.…”

Section: Methodsmentioning

confidence: 99%

Fusion-fission and quasifission of superheavy systems withZ=110–116formed inCa48-induced reactions

et al. 2014

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Background:In heavy-ion-induced reactions the mechanism leading to the formation of the compound nucleus and the role of quasifission is still not clear. Purpose: Investigation of the quasifission process of superheavy composite systems with Z = 110-116 and comparison with properties of fusion-fission and quasifission of lighter composite systems. Method: Mass and energy distributions of fissionlike fragments formed in the reactions 48 Ca + 232 Th, 238 U, 244 Pu, and 248 Cm at energies near the Coulomb barrier have been measured using the double-arm time-of-flight spectrometer CORSET at the U-400 cyclotron of the FLNR JINR. Results: The most probable fragment masses as well as total kinetic energies and their dispersions in dependence on the interaction energies and ion-target combinations have been studied for asymmetric and symmetric fragments formed in the reactions. The capture cross sections were obtained for the reactions 48 Ca + 244 Pu and 248 Cm. The lower limits for fission barriers of 283−286 Cn, 289−292 Fl, and 293−296 Lv compound nuclei were estimated. Conclusions: Analysis of the properties of symmetric fragments has shown that a significant part of these fragments may be attributed to fusion-fission process for the reactions 48 Ca+ 238 U, 244 Pu, and 248 Cm.

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Fusion probabilities in the reactions40,48Ca+238U at energies around the Coulomb barrier

Cited by 84 publications

References 22 publications

Dissipative dynamics in quasifission

Dissipative dynamics in quasifission

Time-dependent Hartree-Fock calculations for multinucleon transfer and quasifission processes in theNi64+U238reaction

Fusion-fission and quasifission of superheavy systems withZ=110–116formed inCa48-induced reactions

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