Transmission coefficients in strongly deformed nuclei

Aleshin, V.P.

doi:10.1016/0375-9474(96)00188-1

Cited by 10 publications

(7 citation statements)

References 38 publications

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“…those proposed in Refs. [52][53][54][55]. Although postsaddle particle multiplicity is not available from experiment, the present work demonstrates that to extract any reliable conclusion on postsaddle dissipation in comparing experiment and theory, deformation effects have to be accurately accounted for in the calculations.…”

Section: -5mentioning

confidence: 86%

“…Although deformation effects were neglected in model simulations for the measured prescission multiplicities of GDR γ rays [31,32,44], neutrons [37,38,51], and charged particles [36], its importance in interpreting the particle multiplicity data has been pointed out [39,40,[52][53][54][55][56]. For instance, Lestone [39] used a statistical model to demonstrate that to reproduce the multiplicity data of nuclei 195 Pb, it is critical to account for the effects of deformation on particle emission.…”

Section: Introductionmentioning

confidence: 99%

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Significant role of deformation in probing postsaddle nuclear dissipation with light particle emission

2010

Phys. Rev. C

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Using a one-dimensional Langevin model, we study the effects of deformation on the multiplicities of postsaddle neutrons, protons, α particles, and giant dipole resonance (GDR) γ rays of a heavy fissioning system 240 Cf as probes of postsaddle nuclear dissipation (β). It is shown that postsaddle dissipation effects on these light particles have a significant deformation dependence. Furthermore, we find that the role of deformation depends on the type of the particle. It reduces the sensitive influence of β on protons, α particles, and GDR γ rays substantially, whereas it enhances the sensitivity of neutrons to β. The results suggest that to accurately extract the postsaddle friction strength by comparing measured prescission particle multiplicities of heavy nuclei with calculations based on statistical models or stochastic equations like Langevin equations, it is important to take into account the deformation effects. The influence of model dimensionality is discussed.

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Section: -5mentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Significant role of deformation in probing postsaddle nuclear dissipation with light particle emission

2010

Phys. Rev. C

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“…As shown in Ref. [35], the effects of the shape distortions on particle emission are treated by these formulas more rigorously than in heuristic models [36,37,38,39,40]. The input parameters of these formulas are the effective separation energies S eff ν calculated including deformation energies [11], the level density parameter a, the height V b and the radius R b of the corresponding spherical barrier experienced by a particle.…”

Section: Particle Emissionmentioning

confidence: 99%

Dynamic and quasistatic trajectories in quasifission reactions and particle emission

et al. 2001

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We show that the quasifission paths predicted by the one-body dissipation dynamics, in the slowest phase of a binary reaction, follow a quasistatic path, which represents a sequence of states of thermal equilibrium at a fixed value of the deformation coordinate. This establishes the use of the statistical particle-evaporation model in the case of dynamical time-evolving systems. Pre-and post-scission multiplicities of neutrons and total multiplicities of protons and α particles in fission reactions of 63 Cu+ 92 Mo, 60 Ni+ 100 Mo, 63 Cu+ 100 Mo at 10 MeV/u and 20 Ne+ 144,148,154 Sm at 20 MeV/u are reproduced reasonably well with statistical model calculations performed along dynamic trajectories whose slow stage (from the most compact configuration up to the point where the neck starts to develop) lasts some 35 × 10 −21 s.

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“…First suggested in the context of neutron-induced fission, Eq. (1), after coupling to particle evaporation from deformed nuclei [4,5] and completing by a random force [6][7][8][9][10], turned eventually into a vital tool for extracting empirical values of M, f , γ from fusion, fusion-fission, and quasifission processes following nucleus-nucleus collisions at the energies per nucleon well below the Fermi-energy [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

“…In[39] we use the t 0 − t 3 version of the Skyrme force to obtain the semiclassical expression for Γ 1 in finite spherical nuclei and compare it to the values of Γ 1 in infinite matter.The smallness of the collision time τ 0 compared to the mean free path time ∼ Γ −1 , allows to use the asymptotic form (151), (152) for all t in (150), givingγ = im 2 νλ |φ λν | 2 f λfν ∞ −∞ t dt e −η|t| d4 dt 4 e −Γ λν |t| e −iE λν t ,…”

mentioning

confidence: 99%