Three-body processes in the32S+45Sc reaction at 5.6 MeV/u

Boccaccio, P.; Mwose, P. K.; Vannucci, L.; Bettiolo, M.; Ricci, R. A.; Augustyniak, W.; Massa, I.; Vannini, G.; Coffin, J. P.; Fintz, P.; Guillaume, G.; Heusch, B.; Jundt, F.; Rami, F.; Wagner, P.

doi:10.1007/bf02771453

Cited by 3 publications

(3 citation statements)

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“…In summary, the present charge-deficit results are consistent with a statistical decay of binary fragments and follow the proposed systematics for this behaviour quite well, in contrast to the data of [26,27]. The absence of ternary events in the present measurement is consistent with results from 32 S induced reactions where evidence of three-body processes is only seen at incident energies higher than 10 MeV/nucleon [28].…”

Section: Discussionsupporting

confidence: 90%

“…In previous experiments using projectiles of mass A proj = 32 to 40 on various targets, events corresponding to the emission of three heavy fragments (A ≥ 5) have been found to occur significantly (at a 10 % level) only at higher bombarding energies (10-15 MeV/nucleon) [23][24][25]. More recently, however, there has been evidence cited in the literature [26,27] for three-body events in 32 S induced reactions at lower energies (4-6 MeV/nucleon).…”

Section: Resultsmentioning

confidence: 99%

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Cl35+12C as

et al. 1996

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The fully energy-damped yields from the 35 Clϩ 12 C reaction have been systematically investigated using particle-particle coincidence techniques at a 35 Cl bombarding energy of ϳ8 MeV/nucleon. The fragmentfragment correlation data show that the majority of events arises from a binary-decay process with rather large numbers of secondary light-charged particles emitted from the two excited exit fragments. No evidence is observed for ternary break-up events. The binary-process results of the present measurement, along with those of earlier, inclusive experimental data obtained at several lower bombarding energies are compared with predictions of two different kinds of statistical model calculations. These calculations are performed using the transition-state formalism and the extended Hauser-Feshbach method and are based on the available phase space at the saddle point and scission point of the compound nucleus, respectively. The methods give comparable predictions and are both in good agreement with the experimental results thus confirming the fusionfission origin of the fully damped yields. The similarity of the predictions for the two models supports the claim that the scission point configuration is very close to that of the saddle point for the light 47 V compound system. The results also give further support for the specific mass-asymmetry-dependent fission barriers needed in the transition-state calculation. ͓S0556-2813͑96͒02407-7͔

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Section: Discussionsupporting

confidence: 90%

Section: Resultsmentioning

confidence: 99%

Cl35+12C as

et al. 1996

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“…32 S+45 Sc[117] and 32 S+ 59 Co[118] reactions, both measured with E lab ( 32 S)=180 MeV(5.6 MeV/u). The nuclear-charge deficits from the compound-nucleus charge found in the35 Cl+ 24 Mg exclusive measurement, however, can be fully accounted for by the sequential evaporation of light charge particles (LCP), in agreement with the systematics established for a large number of reactions studied at bombarding energies below 15 MeV/nucleon[119].Although the fission picture is seen to work well in the35 Cl+ 24 Mg reaction, a very different conclusion is reached by Yokota et al [120] in a study of two systems ( 37 Cl+ 27 Al and 16 O+ 48 Ti) leading to the somewhat heavier 64 Zn compound system.…”

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confidence: 99%

Binary decay of light nuclear systems

1999

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A review of the characteristic features found in fully energy-damped, binarydecay yields from light heavy-ion reactions with 20 ≤ A target + A projectile ≤ 80 is presented. The different aspects of these yields that have been used to support models of compound-nucleus (CN) fission and deep-inelastic dinucleus orbiting are highlighted. Cross section calculations based on the statistical phase space at different stages of the reaction are presented and compared to the experimental results. Although the statistical models are found to reproduce most of the observed experimental behaviors, an additional reaction component corresponding to a heavy-ion resonance or orbiting mechanism is also evident in certain systems. The system dependence of this second component is discussed. The extent to which the binary yields in very light systems (A CN ≤ 32) can be viewed as resulting from a fusion-fission mechanism is explored. A number of unresolved questions, such as whether the different observed behaviors reflect characteristically different reaction times, are discussed. I. INTRODUCTIONAs the interaction energy for a heavy-ion reaction increases above the Coulomb barrier, the reaction grazing angle moves to more forward angles so that, by a value of about 20% above the barrier, very small quasielastic and single-nucleon transfer reaction yields are expected at larger scattering angles. Instead, the incident flux that might be expected to scatter to larger angles, corresponding to smaller impact parameters, is trapped by the formation of a compound nucleus. For lighter systems, this compound system subsequently decays by light particle and γ-ray emission, with a very small heavy-fragment (A > 4) emission component. The experimental observation of significant large-angle, elastic-scattering cross sections at energies well above the Coulomb barrier has therefore been viewed with Calculation of fission cross sections in the statistical models is based on the Hauser-Feshbach formalism. For a compound nucleus of spin J that is populated with a partial fusion cross section of σ J , the partial fission cross section is given in terms of the ratio of the fission decay width Γ f is J to the total decay width for this spin Γ tot J , with

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