On the determination of the effective barrier in heavy ion collisions

Silveira, R. da

doi:10.1016/0370-2693(74)90547-4

Cited by 10 publications

(4 citation statements)

References 12 publications

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“…Refinements can be made to take into account recoil effects in the expression for Qopt. Such an expression for the interaction potential gives a correct description of the outer surface of the nucleus which is of interest here [16]. The values adopted for the nuclear parameters are not critical, and the conclusions which follow are not affected by small changes in these values.…”

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confidence: 97%

Influence of energetics on the thresholds of heavy ion transfer reactions

et al. 1975

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The possibility of sub-barrier transfers is discussed from the point of view of the energetics of the reaction. The position of the entrance channel potential energy curve Vi(R) relative to that of the exit channel corrected for the mass balance Vf(R ) - Qgg appears to be crucial. When the former curve is situated above the latter one, the transfer is energetically probable and will occur as soon as the colliding nuclei are sufficiently close to each other, i.e. for sub-barrier incident energies. Experimental examples are given

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confidence: 97%

Influence of energetics on the thresholds of heavy ion transfer reactions

et al. 1975

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“…Nevertheless we believe that the procedure should give an answer very close to the truth. Earlier investigations [10] on the dependence of the rainbow angle on different potential shapes, suggest the very simple form…”

Section: Le Journal De Physique -Lettres Classificationmentioning

confidence: 95%

“…In order to obtain OR we proceed as in ref. [10] by taking advantage of the fact that quasi-elastic processes, when induced by nuclear forces (nuclear excitation and neutron surface transfer reactions), give rise to a scattering crosssection which exhibits a rather pronounced maximum at the corresponding angle of grazing trajectory. We shall use here the inelastic scattering data in order to obtain OR.…”

Section: It Givesmentioning

confidence: 99%

A classical inversion procedure to obtain the real part of the heavy-ion optical potential

Silveira

1978

J. Phyique Lett.

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“…If so, it becomes strightforward to obtain a_(0) and 0-+(0) at each scattering angle 9 We have applied this procedure to two experimental situations: elastic' scattering of c~ on Ca 4~ at E =104MeV [-9], and c~ on Ni 5s, at E=140MeV i) The cross-section for scattering through "positive angles', 0_(0), shows an exponential-like decrease characteristic of a Coulomb rainbow in the angular range beyond the Coulomb rainbow angle, 0;. For E>> V~ (V~ is the Coulomb barrier) 0~ behaves [15] like ViE. In both examples, one has, 0~ ~ 5 ~ ii) The cross-section for scattering through "negative angles" a+(0), shows an interference pattern in which one easily identifies a rainbow maximum (beyond which a+(0) decreases almost exponentially) as well as the first supernumerary bow.…”

Section: -1mentioning

confidence: 99%