Strong change in the mass distribution of fission-like processes around ACN = 100

Oeschler, H.; Wagner, P.; Coffin, J.P.; Engelstein, P.; Heusch, B.

doi:10.1016/0370-2693(79)90962-6

Cited by 39 publications

(11 citation statements)

References 13 publications

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“…In Table 1 we show the values of the characteristic angular momenta which should be compared with those given in Ref. 4 as well as the centroids and widths of the distributions at l=/orb. Figure 4 shows specific mass distributions which were obtained for the different systems.…”

Section: Evolution Of the Distribution Functionmentioning

confidence: 99%

“…However, it is often quite difficult to see a clean separation between these mechanisms and to find a general framework in order to describe them. Puzzling effects were discovered in a set of experiments which were performed some time ago at Strasbourg [4]. Six medium-weight targets, 59Co, 65Cu, 74Ge, 79Br, SSRb and 89y, were bombarded with 32S at energies corresponding approximately to 4 MeV/A.…”

Section: Introductionmentioning

confidence: 99%

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Mass transport mechanism in the collision of sulphur on medium-weight nuclei

Lejeune

Richert

1980

Z Physik A

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Section: Evolution Of the Distribution Functionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Mass transport mechanism in the collision of sulphur on medium-weight nuclei

Lejeune

Richert

1980

Z Physik A

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“…In this respect the present 84Kr 1 Present address: GANIL, B.P. 5027, F-14021 Caen, France z On leave from Department of Modern Physics, Lanzhou, China q-24Mg analysis completes the large number of data which exists for the composite system 108 or neighbouring mass having nearly the same fissility: p+ Ag [5], lZc+98Mo [6], ~9F+89Y and 28Si+74Ge [7], 32Sq-TgGe and 32S+65Cu [8].…”

mentioning

confidence: 99%

Fissionlike exit channel in the 5.8 MeV/u84Kr on24Mg reaction

Heusch¹,

Coffin²,

Engelstein³

et al. 1983

Z Physik A

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Fissionlike (FL) phenomena for systems around mass 100 have been shown previously interpretable in terms of dynamical fission. This appears to be dependent on the entrance channel mass asymmetry. We have studied the fissionlike exit channel in the 84Kr+ 24Mg reaction at E(Kr)=5.8 MeV/u. This energy is just above the threshold of fission, so that a clear separation between the Deep Inelastic Component (DIC) and the FL one can be achieved. The bombarding energy corresponds to the same excitation energy in the composite system ~~ (E* = 101 MeV) as in the 32S (158 MeV) on 76Ge reaction we studied earlier and for which fusion-evaporation along with fission-like contributions were measured. The width of the FL distribution confirms the previously observed dependence with the mass asymmetry in the entrance channel which is consistent with the extra push model.The reaction 84Kr on 24Mg has been analysed in the framework of a systematic study of fissionlike (FL) deexcitation channel of the composite system l~ versus bombarding energy and the mass asymmetry in the entrance channel 1-1]. We have used an energy corresponding to the onset of fission, according to the rotating liquid drop model RLDM [2], where the inverted kinematics for all fully relaxed products are focused in a forward cone so that the different contributions can be analysed more easily. A double humped fully relaxed fragment distribution has been observed first in the 84Kr+Z7A1 reaction [31. The goal of the 84Kr+24Mg measurement is to look for such a two component distribution which has not been observed in the 32S+76Ge reaction. Another important aim is to measure the width of the FL component for which a strong dependence with the entrance channel mass asymmetry has been observed 1-1] in contradiction with the compound nucleus formation [2,4]. In this respect the present 84Kr In the study of the 32S+ 76Ge reaction [1] the fusion models have been shown to reproduce very well the fusion evaporation (FE) cross sections from nearly the coulomb barrier E B up to 2.3 EB: in particular the saturation predicted by the RLDM I-2] when the fission barrier B I drops under the neutron binding energy, is well followed. In an investigation of the influence of the entrance channel mass asymmetry leading to the isobar a~ Agarwal et al.[9] report a difference in the FE critical angular momenta lc FE measured for 16 0 + 92Mo FE (Icr = 59 _+ 3 h) and 52Cr+ 56Fe (/~FE=53 _+4 h). In the present case such a difference is not expected because the FE cross section measured for the 84Kr+ZTA1 reaction 1-10] (leading to the neighbouring CN rain) is very close to the value obtained for 32S+76Ge for nearly the same excitation energy in the CN. The experiences have been performed using a

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“…The centroid of the mass distribution keeps also stable. The practical calculation was performed for l values lying between 54 corresponding to l~f=B, [7] and /orb=62 in the case of S on Co and 57=<l<lorb= 75 in the case of S on Ge. For this last system IB~ =8,, =63, /-values between 57 and 63 were taken into account because it is only for /<56 that the mass asymmetry starts to increase strongly, leading to the formation of a compound nucleus.…”

Section: P(~ Lo) Through (6)mentioning

confidence: 99%

“…Universit~t di Catania, Italy strongly angle dependent and peaked in the vicinity of the grazing angle lg r, a feature which characterises a mechanism commonly called deep inelastic reaction. On the other hand, the angular distributions which were measured for some systems [3,4,7] come out to be rather isotropic as a function of the scattering angle. In our classical picture this discrepancy might indicate that the experimental cross sections result from a physical situation in which the interacting complex lives for a relatively long time, the fragments orbit around each other before separating again with equal probability in all directions.…”

Section: Introductionmentioning

confidence: 98%

An estimate of the contribution to the cross section due to the break-up of a trapped complex in the reaction of S on Co and S on Ge

1981

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This paper deals with the contribution to the reaction cross section coming from the break-up of an interacting complex of two fragments which is trapped in a pocket of the relative potential acting between the fragments. Calculations for the systems S on Co and S on Ge are done by using the semi-classical expression of tunneling through the barrier and the statistical break-up probability. The results are discussed and conclusions about the reaction mechanism are drawn.

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Strong change in the mass distribution of fission-like processes around ACN = 100

Cited by 39 publications

References 13 publications

Mass transport mechanism in the collision of sulphur on medium-weight nuclei

Mass transport mechanism in the collision of sulphur on medium-weight nuclei

Fissionlike exit channel in the 5.8 MeV/u84Kr on24Mg reaction

An estimate of the contribution to the cross section due to the break-up of a trapped complex in the reaction of S on Co and S on Ge

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