Cold fusion in symmetric 90Zr-induced reactions

Keller, J. G.; Schmidt, Karl‐Heinz; Heßberger, F. P.; Münzenberg, G.; Reisdorf, W.; Clerc, H.‐G.; Sahm, C. C.

doi:10.1016/0375-9474(86)90514-2

Cited by 168 publications

(53 citation statements)

References 36 publications

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“…At present there are insufficient data in this region to include in a systematic survey. In a recent publication on the reaction 60 Ni+ 89 Y, Jiang et al [18,19] have suggested that, at bombarding energies below about 0.91V B , the rate of fall of fus with decreasing bombarding energy becomes greater than that predicted by calculations (they claim similar results for the reactions 58 Ni+ 58 Ni [20], 90 Zr+ 89 Y, 90 Zr, 92 Zr [21], and 64 Ni+ 64 Ni [22]). Hagino et al [23] pointed out that, at extreme subbarrier energies ( fus down to the 10 −4 mb level), it is necessary to make an exact calculation of the barrier penetrability, rather than one based on the parabolic barrier approximation, and, furthermore, that the large values of a required to fit the above-barrier cross sections significantly affect the sub-barrier cross sections.…”

Section: Introductionmentioning

confidence: 52%

Systematic failure of the Woods-Saxon nuclear potential to describe both fusion and elastic scattering: Possible need for a new dynamical approach to fusion

et al. 2004

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A large number of precision fusion excitation functions, at energies above the average fusion barriers, have been fitted using the Woods-Saxon form for the nuclear potential in a barrier passing model of fusion. They give values for the empirical diffuseness parameter a ranging between 0.75 and 1.5 fm, compared with values of about 0.65 fm which generally reproduce elastic scattering data. There is a clear tendency for the deduced a to increase strongly with the reaction charge product Z 1 Z 2 , and some evidence for the effect of nuclear structure on the value of a, particularly with regard to the degree of neutron richness of the fusing nuclei, and possibly with regard to deformation. The measured fusion-barrier energies are always lower than those of the bare potentials used, which is expected as a result of adiabatic coupling to high energy collective states. This difference increases with increasing Z 1 Z 2 and calculations show that about 1 / 3 of it may be attributed to coupling to the isoscalar giant-quadrupole resonances in the target and projectile. Coupling to all giant resonances may account for a significant part. Fluctuations about the trend line may be due to systematic errors in the data and/or structure effects such as coupling to collective octupole states. Previously suggested reasons for the large values of a have been related to departures from the Woods-Saxon potential and to dissipative effects. This work suggests that the apparently large values of a may be an artifact of trying to describe the dynamical fusion process by use of a static potential. Another partial explaination might reside in fusion inhibition, due for example to deep-inelastic scattering, again a process requiring dynamical calculations.

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Section: Introductionmentioning

confidence: 52%

Systematic failure of the Woods-Saxon nuclear potential to describe both fusion and elastic scattering: Possible need for a new dynamical approach to fusion

et al. 2004

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“…The calculation of the heavy ion interaction potential was done without doing approximations, using Eqs. (5) and (6).…”

Section: Methods Of Calculationsmentioning

confidence: 98%

“…It has been shown both theoretically and experimentally that the sub barrier fusion of spherical and well deformed nuclei is strongly enhanced by deformation [1][2][3][4][5][6][7][8][9][10][11][12][13]. It has long been recognized that the presence of deformation affects the height of Coulomb barrier, its position and its thickness which are especially important quantities for the production of the super-heavy elements [14][15][16].…”

Section: Introductionmentioning

confidence: 99%

Effect of octupole and higher deformations on Coulomb barrier

2009

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“…The approximations used in deriving Eq. (2) give no way to estimate the role of the number and energies of excited levels; for this reason, we fix the factor in front of the bracketed expression on the right-hand side of (11) at (β α R 0 )/ √ 4π = 0.3 in our calculations. This correspond to the average value for all reactions considered here.…”

Section: Analysis Of Experimental Datamentioning

confidence: 99%

“…This effect was found in the fusion of magic and semimagic nuclei for the cases of both symmetric [1,2] and asymmetric [3][4][5][6][7] combinations. The respective reactions were discussed in [8][9][10][11].…”

Section: Introductionmentioning

confidence: 96%

Subbarrier fusion of spherical nuclei of intermediate atomic number

Shilov

2012

Phys. Atom. Nuclei

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A two-humped model was proposed for explaining the suppression of the cross sections for the deep-subbarrier fusion of spherical nuclei that have intermediate atomic numbers. It was shown that the suppression of these cross sections was due to the interference between the incident and reflected fluxes between the two barriers. The results of fitting the cross sections calculated within the two-humped model revealed the invariability of the distance between the vertices of the two barriers. As the charges of colliding nuclei increase, the inner barrier becomes higher than the outer one, and this determines the competition with cross sections for deep-inelastic-transfer reactions.

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Cold fusion in symmetric 90Zr-induced reactions

Cited by 168 publications

References 36 publications

Systematic failure of the Woods-Saxon nuclear potential to describe both fusion and elastic scattering: Possible need for a new dynamical approach to fusion

Systematic failure of the Woods-Saxon nuclear potential to describe both fusion and elastic scattering: Possible need for a new dynamical approach to fusion

Effect of octupole and higher deformations on Coulomb barrier

Subbarrier fusion of spherical nuclei of intermediate atomic number

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