Insights into the dynamics of fusion forming heavy elements

Hinde, David; Dasgupta, M.

doi:10.1016/j.nuclphysa.2006.12.029

Cited by 6 publications

(12 citation statements)

References 18 publications

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“…In the detailed comparisons [118,135], it was found that reactions of 48 Ca compared to 16 O had a < P CN > of 0.25. This is higher than the value 0.15 found for 40 Ar, and may be associated with the double closed shell structure of 48 Ca.…”

Section: New Systematics Of Fusion Suppression By Quasifissionmentioning

confidence: 99%

“…This large factor may result in a lack of separability of the dynamics and particle evaporation. (Adapted from Ref [135]).…”

Section: New Systematics Of Fusion Suppression By Quasifissionmentioning

confidence: 99%

“…To demonstrate the wide applicability of this new approach to investigate the systematics of fusion and quasifission competition, existing data [127] of σxn for all isotopes of Po, Rn, Ra and Th were combined on a single plot in Ref. [135]. This is shown in Fig.…”

Section: New Systematics Of Fusion Suppression By Quasifissionmentioning

confidence: 99%

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Experimental studies of the competition between fusion and quasifission in the formation of heavy and superheavy nuclei

Hinde

Dasgupta

Simpson

2021

Progress in Particle and Nuclear Physics

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Section: New Systematics Of Fusion Suppression By Quasifissionmentioning

confidence: 99%

“…This large factor may result in a lack of separability of the dynamics and particle evaporation. (Adapted from Ref [135]).…”

Section: New Systematics Of Fusion Suppression By Quasifissionmentioning

confidence: 99%

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Experimental studies of the competition between fusion and quasifission in the formation of heavy and superheavy nuclei

Hinde

Dasgupta

Simpson

2021

Progress in Particle and Nuclear Physics

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“…The challenge of understanding fusion dynamics, particularly the relative competition between compound nuclear and noncompound nuclear processes, is a topic of continued interest. This is important, for example, in heavy element synthesis using fusion reactions [1,2]. Fusion results in the formation of a compound nucleus (CN) once the interacting projectile and target nuclei overcome their mutual Coulomb barrier and kinetic energy is dissipated, leaving the system near the equilibrium deformation.…”

Section: Introductionmentioning

confidence: 99%

Fission cross sections as a probe of fusion dynamics at high angular momentum

et al. 2018

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Background: Fusion of heavy nuclei requires energy dissipation to trap the system inside the capture barrier. At high angular momentum, the centrifugal potential causes the barrier radius to reduce, which may lead to energy dissipation outside the barrier, affecting the fusion angular momentum distributions and thus the capture cross sections. Purpose: To investigate the sensitivity of fusion-fission cross sections as a probe of fusion dynamics at high angular momentum. Method: Fission of the compound nucleus 164 Yb formed by three different fusion reactions, namely, 16 O + 148 Sm, 28 Si + 136 Ba, and 40 Ca + 124 Sn, was measured at four beam energies well above their respective capture barriers. Fission cross sections were extracted from the measured fission fragment angular distributions and compared with model calculations of fusion and subsequent fission. Fusion and evaporation residue cross sections available in the literature for the same or similar reactions were used to guide model calculations and obtain the fusion angular momentum distributions. Results: The measured fission characteristics were found to be consistent with fusion-fission, as expected, justifying the use of the statistical model to calculate fission cross sections for each reaction. Significantly different fission cross-section predictions were obtained from calculations using angular momentum distributions corresponding to different coupling schemes and different diffuseness parameter of the nuclear potential. A large diffuseness parameter (0.65 fm) of the nuclear potential was observed to give the best reproduction of both the experimental fusion as well as fission cross sections. Conclusions: Experimental fission cross sections provide a stringent constraint to the fusion model calculations and thus prove to be a sensitive probe for understanding fusion dynamics at high angular momentum. This is shown in the present work by a simultaneous analysis of the fusion and fission cross sections for systems where fission cross sections form a small fraction of the fusion cross section and where noncompound nuclear processes are not a dominant competing channel. Observations from this work also suggest the requirement of evaporation residue as well as fission cross sections of higher precision than those generally available for drawing quantitative conclusions.

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“…This is especially important in heavy element (Z>100) synthesis where these competing processes strongly suppress CN formation [1]. Another observation challenging our understanding of the fusion process has come from a systematic study of fusion cross section measurements for a large variety of projectile-target combinations [2].…”

Section: Introductionmentioning

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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Insights into the dynamics of fusion forming heavy elements

Cited by 6 publications

References 18 publications

Experimental studies of the competition between fusion and quasifission in the formation of heavy and superheavy nuclei

Experimental studies of the competition between fusion and quasifission in the formation of heavy and superheavy nuclei

Fission cross sections as a probe of fusion dynamics at high angular momentum

Investigating fusion dynamics at high angular momentum via fission cross sections

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