Study of evaporation residues produced in reactions of207,208Pb with50Ti

Heßberger, F. P.; Münzenberg, G.; Hofmann, S.; Reisdorf, W.; Schmidt, Karl‐Heinz; Schött, H. J.; Armbruster, P.; Hingmann, R.; Thuma, B.; Vermeulen, D.

doi:10.1007/bf01493453

Cited by 73 publications

(32 citation statements)

References 29 publications

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“…The experimental data used for the comparison are collected in Table 1. They are taken from [17][18][19][20][21] given in the fourth and sixth columns of the table.…”

Section: Resultsmentioning

confidence: 99%

Theoretical half-lives for the heaviest nuclei

Böning¹,

Patyk²,

Sobiczewski³

et al. 1986

Z. Physik A - Atomic Nuclei

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“…The experimental data used for the comparison are collected in Table 1. They are taken from [17][18][19][20][21] given in the fourth and sixth columns of the table.…”

Section: Resultsmentioning

confidence: 99%

Theoretical half-lives for the heaviest nuclei

Böning¹,

Patyk²,

Sobiczewski³

et al. 1986

Z. Physik A - Atomic Nuclei

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“…Previous analyses of cross sections for fusion-evaporation residues in the reactions of 4~ with 2o4, 2o6,207, 2Oapb revealed [20,28] no evidence for a shift of the barrier relative to Collisions near the Coulomb-Barrier 321…”

Section: Scaling Of the Extra-extra Push Energiesmentioning

confidence: 94%

Evidence for quasi-fission in40Ar+208Pb collisions near the coulomb-barrier

Keller

Lützenkirchen

Kratz

et al. 1987

Z. Physik A - Atomic Nuclei

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Fission-fragment angular distributions were measured in the reaction of 4~ with 2~ near the fusion barrier. For nearly symmetric mass-/charge splits we find angular distributions symmetric around 0 = 90 degrees, however, with unusually large anisotropies. These develop gradually into forward-backward asymmetric distributions as one moves away from mass-/charge symmetry. This indicates that non-compound fission ('quasi-fission') competes with true fusion-fission. The relative contribution of quasi-fission to the total fission cross section is somewhere between 51 and 85%. In the framework of the extrapush model this is equivalent to an extra-extra push energy for compound-nucleus formation inside the true fission saddle point of 4 < Exx < 9 MeV in agreement with a recent empirical parametrization of fusion-barrier shifts based on fusion-fission cross sections. On the basis of cross sections for fusion-evaporation residues it had previously been concluded that fusion of 4~ with Pb isotopes occurs unhindered. Possible reasons for this apparent discrepancy are discussed. PACS: 25.70.Jj

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“…By comparison with experiment we are then able to extract quantitatively the increase of this fusion hindrance with compound nuclear charge. Such a comparative approach has been used by F. Hel3berger et al [7] in studies of the synthesis of element 104. A more empirical approach to quantize fusion hindrance in heavy-element synthesis reactions has been published in [1] and more recently by Iljinov et al [8].…”

Section: Introductionmentioning

confidence: 99%

How well do we understand the synthesis of heavy elements by heavy-ion induced fusion?

Reisdorf¹,

Schädel²

1992

Z. Physik A - Hadrons and Nuclei

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169

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Experimental cross sections to synthesize heavy ion induced fusion reactions are confronted with calculations using the conventional picture of complete fusion after passing the barrier plus statistical deexcitation after complete equilibration. The sensitivity of the calculations to some of the parameters is demonstrated. Despite this sensitivity, a single parameter set is found that reproduces well the large body of data from experiments using actinide targets. By comparison, for the more symmetric entrance channels using targets around 2~we find a fusion hindrance that increases steeply with increasing compound nuclear charge. Predictions for a few reactions of future interest for the synthesis of heavy elements are also presented.

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Study of evaporation residues produced in reactions of207,208Pb with50Ti

Cited by 73 publications

References 29 publications

Theoretical half-lives for the heaviest nuclei

Theoretical half-lives for the heaviest nuclei

Evidence for quasi-fission in40Ar+208Pb collisions near the coulomb-barrier

How well do we understand the synthesis of heavy elements by heavy-ion induced fusion?

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