Moments of fusion-barrier distributions

Rehm, K. E.; Esbensen, H.; Jiang, C. L.; Back, B. B.; Stefanini, A. M.; Montagnoli, G.

doi:10.1103/physrevc.94.044612

Cited by 4 publications

(29 citation statements)

References 48 publications

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“…No evidence for hindrance is found for 60 Ni + 100 Mo. This is also indicated by the trend of the logarithmic slopes reported in the inset of that figure, showing that the L CS value is only overcome by 64 Ni + 100 Mo.…”

Section: Heavier Systemssupporting

confidence: 62%

“…26, one also notices that far above the barrier the excitation function for 40 Ca + 96 Zr increases more slowly than for 48 Ca + 96 Zr, and the cross sections tend to become smaller. This is a further typical effect of strong couplings to transfer channels [60,84].…”

Section: B Medium-mass and Medium-light Systemsmentioning

confidence: 99%

“…Lab. [3] indicated that fusion cross sections of 60 Ni + 89 Y have an unexpected behaviour far below the barrier, i.e., they drop much faster than predicted by standard CC calculations. This opened a new area of research, and this phenomenon (named "hindrance") was soon recognised as a general effect, even if with different aspects whose origin is still a matter of debate and research in the community.…”

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confidence: 99%

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Recent experimental results in sub- and near-barrier heavy-ion fusion reactions

Montagnoli

Stefanini

2017

Eur. Phys. J. A

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Recent advances obtained in the field of near and sub-barrier heavy-ion fusion reactions are reviewed. Emphasis is given to the results obtained in the last decade, and focus will be mainly on the experimental work performed concerning the influence of transfer channels on fusion cross sections and the hindrance phenomenon far below the barrier. Indeed, early data of sub-barrier fusion taught us that cross sections may strongly depend on the low-energy collective modes of the colliding nuclei, and, possibly, on couplings to transfer channels. The coupled-channels (CC) model has been quite successful in the interpretation of the experimental evidences. Fusion barrier distributions often yield the fingerprint of the relevant coupled channels. Recent results obtained by using radioactive beams are reported. At deep sub-barrier energies, the slope of the excitation function in a semilogarithmic plot keeps increasing in many cases and standard CC calculations overpredict the cross sections. This was named a hindrance phenomenon, and its physical origin is still a matter of debate. Recent theoretical developments suggest that this effect, at least partially, may be a consequence of the Pauli exclusion principle. The hindrance may have far-reaching consequences in astrophysics where fusion of light systems determines stellar evolution during the carbon and oxygen burning stages, and yields important information for exotic reactions that take place in the inner crust of accreting neutron stars.

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Section: Heavier Systemssupporting

confidence: 62%

Section: B Medium-mass and Medium-light Systemsmentioning

confidence: 99%

mentioning

confidence: 99%

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Recent experimental results in sub- and near-barrier heavy-ion fusion reactions

Montagnoli

Stefanini

2017

Eur. Phys. J. A

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“…(1) at energies above the Coulomb barrier where σ (E)E vs E is nearly a straight line (see Ref. [28]). For this reason, this representation of the data, σ (E)E, is frequently used since it allows for a simple derivation of the fusion barrier height and radius by simple linear fits to the asymptotic, above-barrier part of the excitation function.…”

Section: Representations Of the Excitation Functionmentioning

confidence: 97%

Heavy-ion fusion reactions at extreme sub-barrier energies

et al. 2021

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The study of fusion reactions at extreme sub-barrier energies has seen an increased interest in recent years, although difficult to measure due to their very small cross sections. Such reactions are extremely important for our understanding of the production of heavy elements in various environments. In this article, the status of the field is reviewed covering the experimental techniques, the available data, and the theoretical approaches used to describe such reactions. The fusion hindrance effect, first discovered in medium-mass systems, has been found to be relevant also for lighter systems. In some light systems, resonance structures are found to be important, while for heavy systems, the fission process plays an important role. In the near barrier region, couplings to collective excitations in the fusion participants and transfer reactions have been found to give a good description of the measured fusion cross sections and it results in a distribution of fusion barrier heights. New physics ingredients, related to the overlap process of the two projectiles, have to be introduced to describe the hindrance behavior. In addition, it has recently been found that the fusion cross section in both near-barrier and sub-barrier regions can be described very well in many cases using simple, analytical forms of the barrier-height distributions or a modified version of the classic Wong formula.

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“…The uncertainties in the cross sections measured at ANU and the general issue of the use of coincident fission fragments to deduce capture-fission excitation functions is discussed in [23,26]. The uncertainties in deduced quantities from radioactive beam experiments, such as this one, have been discussed in detail by [27]. The small number of of measured points on capture excitation functions and the large uncertainties in the deduced cross sections can lead to significant uncertainties in deduced parameters of fusion barrier distributions.…”

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confidence: 99%

Capture cross sections for the synthesis of new heavy nuclei using radioactive beams

et al. 2018

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We have measured the capture-fission excitation functions for the reaction of stable 39 K and radioactive 46 K with 181 Ta using the ReA3 facility at the NSCL. In addition the capture-fission excitation function for the 39 K + 181 Ta reaction was measured at ANU. The capture cross sections for the 46 K + 181 Ta reaction are larger than those for the 39 K induced reactions in the near barrier region although the reduced excitation functions for the two reactions do not indicate any fundamental differences between the reactions. The results of the measurements are compared to modern phenomenological models and microscopic TDHF calculations. The implications of these measurements for the synthesis of heavy nuclei at radioactive beam facilities are discussed.

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Moments of fusion-barrier distributions

Cited by 4 publications

References 48 publications

Recent experimental results in sub- and near-barrier heavy-ion fusion reactions

Recent experimental results in sub- and near-barrier heavy-ion fusion reactions

Heavy-ion fusion reactions at extreme sub-barrier energies

Capture cross sections for the synthesis of new heavy nuclei using radioactive beams

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