Competition between fusion-fission and quasi-fission in the reaction 28Si+208Pb

Hinde, David; Morton, Clyde; Dasgupta, M.; Leigh, J.R.; Mein, J. C.; Timmers, H.

doi:10.1016/0375-9474(95)00306-l

Cited by 58 publications

(56 citation statements)

References 44 publications

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“…The fission fragment yields in the MWPCs were converted into fission cross-sections as described in Refs. [19,13].…”

Section: Resultsmentioning

confidence: 99%

“…Its shape is related to the nuclear structure of the reactants. Barrier distributions have been measured for nuclei with static deformations [2][3][4][5][6][7][8][9], for nuclei where vibrational degrees of freedom dominate [2,10], in systems where the effects of transfer channels [2,10,11] and multi-phonon excitations [12,13] are important, and where the influence of the projectile excitation is prominent [7,8,13]. …”

Section: Introductionmentioning

confidence: 99%

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Coupled-channels analysis of the16O+208Pbfusion barrier distribution

et al. 1999

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Analyses using simplified coupled-channels models have been unable to describe the shape of the previously measured fusion barrier distribution for the doubly magic 16 O+ 208 Pb system. This problem was investigated by remeasuring the fission excitation function for 16 O+ 208 Pb with improved accuracy and performing more exact coupled-channels calculations, avoiding the constant-coupling and first-order coupling approximations often used in simplified analyses. Couplings to the single-and 2-phonon states of 208 Pb, correctly taking into account the excitation energy and the phonon character of these states, particle transfers, and the effects of varying the diffuseness of the nuclear potential, were all explored. However, in contrast to other recent analyses of precise fusion data, no satisfactory simultaneous description of the 1 shape of the experimental barrier distribution and the fusion cross-sections for 16 O+ 208 Pb was obtained.

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“…The fission fragment yields in the MWPCs were converted into fission cross-sections as described in Refs. [19,13].…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coupled-channels analysis of the16O+208Pbfusion barrier distribution

et al. 1999

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“…The Woods-Saxon shape for the nucleus-nucleus interaction potential was used extensively in the literature in order to analyze the precision fusion excitation functions [4,[14][15][16]. Excellent fit was achieved with the diffuseness of this potential ranging from 0.75 up to 1.5 fm.…”

Section: Discussionmentioning

confidence: 99%

The M3Y Double Folding Dissipative Model in Agreement with Precise Fusion Cross Sections

Gontchar¹,

Chushnyakova²

2013

JMP

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Large numbers of precision fusion excitation functions were fitted in the literature using the nucleus-nucleus interaction potential having the Woods-Saxon shape. The diffuseness of this potential fusion ranges from 0.75 to 1.5 fm. This is much larger than the value of 0.65 fm required by the elastic scattering data. Trying to resolve this contradiction we develop the dissipative trajectory model based on the density-dependent M3Y NN-forces folded with the nuclear matter distribution. Resulting potential possesses the normal diffuseness about 0.65 fm. Pb reactions within 5%.

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“…Pulsed beams, separated by 107 ns, of 16 Charged particles arising from the reactions, namely, the fission fragments following fusion of the systems, elastically scattered beam particles and recoils were detected using the CUBE spectrometer [7] which consists of two large area Multi-Wire Proportional Counters (MWPC) with an active area of 27.9 cm x 37.5 cm each. For all three measurements, one detector (MWPC 2) was placed at forward angle with respect to the beam axis, corresponding to the detector center at polar angle of θ 2 =45 • , giving an angular coverage from 5 • to 80 • and azimuthal angle of φ 2 =0 • .…”

Section: Methodsmentioning

confidence: 99%

“…These velocities were then converted into masses using the kinematic coincidence technique described in the Appendix of Ref. [7]. By putting gates on the timing signals in Fig.…”

Section: Experimental Fission Cross Sectionsmentioning

confidence: 99%

Investigating fusion dynamics at high angular momentum via fission cross sections

et al. 2017

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Abstract. A quantitative understanding of fusion dynamics at high angular momentum is attempted employing experimental fission cross sections as a probe and carrying out a simultaneous description of the fusion and fission cross sections at above barrier energies. For this, experimental fission fragment angular distributions for three systems: 16 164 Yb at similar excitation energies, have been measured at four beam energies above their respective capture barriers. A simultaneous description of the angle integrated fission cross sections and evaporation residue/fusion cross sections available in literature for the systems is carried out using coupled-channels and statistical model calculations. Fission cross sections, which are most sensitive to the changes in angular momentum, provide very stringent constraints for model calculations thus indicating the need of precision evaporation residue as well as fission cross sections in such studies. A large diffuseness (a o >0.65 fm) of the nuclear potential gives the best reproduction of the experimental data. In addition, different coupling schemes give very different angular momentum distributions, which, in turn, give very different fission cross section predictions. Both these observations hint at the explanation that depending on energy dissipation of the interacting nuclei occurring inside or outside the fusion pocket, very different fission cross sections can result due to heavily altered angular momentum and thus justifies the sensitivity of fission cross sections used as probes in the present work.

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Competition between fusion-fission and quasi-fission in the reaction 28Si+208Pb

Cited by 58 publications

References 44 publications

Coupled-channels analysis of the16O+208Pbfusion barrier distribution

Coupled-channels analysis of the16O+208Pbfusion barrier distribution

The M3Y Double Folding Dissipative Model in Agreement with Precise Fusion Cross Sections

Investigating fusion dynamics at high angular momentum via fission cross sections

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