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Vergani, P.; Gadioli, E.; Vaciago, E.; Fabrici, E.; Erba, E. Gadioli; Galmarini, M.; Ciavola, G.; Marchetta, C.

doi:10.1103/physrevc.48.1815

Cited by 85 publications

(35 citation statements)

References 27 publications

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“…These findings are not substantially changed even when preequilibrium neutron emission is included, as has recently been suggested for reactions in this energy range [1 iI, essentially due to the relatively small amount of the effect (about 0.4 neutron/event at the same E/A from [11]). Our conclusion then disagrees with the analysis of both [3] and [4].…”

Section: J2 Km2]mentioning

confidence: 51%

Gamma-ray multiplicity measurements in the28Si+64Ni reaction at 163.8 MeV

Pietro

Cardella

Musumarra

et al. 1994

Z. Physik A - Hadrons and Nuclei

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Abstract. The 28Si + 64Ni reaction at 163.8 MeV incident energy is studied by measuring in coincidence 7-rays and charged particles identified from Z=2 to Z=16. The transition from quasi-elastic to more damped reactions is observed when the difference between the detected charge and the projectile one is increased. The strong influence of the particle decay on the measured ):-ray multiplicity is evidenced with the help of the statistical model computer code CASCADE. Dissipative events are well described in the rolling limit with excitation energy equally shared between the fragments. The overall agreement is lost for the fragments with the projectile charge which show a small value of the 7-multiplicity even for dissipative events. This is probably connected with the previously observed non statistical behavior of gamma rays emitted in coincidence with projectile-like fragments. In the alpha-spectrum measured in coincidence with gamma-rays, the deexcitation of fused systems is clearly separated from in flight emission of deep inelastic fragments. The low measured gamma-ray multiplicity for fusion events is qualitatively explained taking into account the effect of alpha-emission in the statistical decay.

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Section: J2 Km2]mentioning

confidence: 51%

Gamma-ray multiplicity measurements in the28Si+64Ni reaction at 163.8 MeV

Pietro

Cardella

Musumarra

et al. 1994

Z. Physik A - Hadrons and Nuclei

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“…Bearing in mind that HIVAP deals with the equilibrated decay of a CN produced in the complete fusion reaction, one may guess that in the case of 214 Ra produced at E lab = 90 MeV in the 4n channel the main ways of its production are pre-equilibrium processes. Such high energy tailing in the xn excitation functions was earlier observed, for example, in the 12 C + 197 Au reaction and was assigned to the pre-equilibrium processes leading to the At isotopes production [33,34]. Therefore, the excited nuclear levels of 214 Ra produced in the 4n and 6n reactions at the same beam energy could be quite different that might lead to different electron emission probabilities.…”

Section: B Charges Of Er Recoils Produced In 12 C + 206 Pbmentioning

confidence: 95%

Charge distributions of Ra recoil ions produced in C12+Pb fusion-evaporation reactions

et al. 2018

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Charge state distributions of the Ra recoil ions produced in the 12 C + Pb fusion-evaporation reactions have been obtained by measuring their yields as a function of the high voltage applied to an electrostatic deflector. Well-defined two-humped yield curves for evaporation residues (ERs) were observed. Such observations can be explained by the different sets of charge states inherent in Ra recoil ions. These charge sets correspond to the equilibrated and nonequilibrated components, as earlier observed for evaporation residues produced in different reactions. The main parameters of the distributions (mean charge values, widths, and relative intensities) for both components have been estimated using Monte Carlo simulations of the transmission of the Ra recoil ions through the deflector. For the equilibrated component the values of the mean charge and width are close to those given by different empirical systematics. For the nonequilibrated component these parameters have been obtained for the first time. The additional nonequilibrated ionization is presumably due to the formation of inner shell vacancies produced by the internal conversion of nuclear isomeric transitions of ERs. Nonequilibrated charge parameters obtained for Ra recoil ions are compared to similar available experimental data and some theoretical predictions.

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“…The observed deviation in EFs with statistical model predictions at relatively higher projectile energies side (tail portion of the EFs) is attributed to the PCN emission process. During last few decades the understanding of the PCN and the CN emission in light ion reactions has been well studied but in heavy ion reactions it needs to be further explored particularly for those associated with the emission of light particles in primary stage in a very short reaction time (10 −21 s) prior to the establishment of equilibrated CN [7,[10][11][12][13][14]. The emission of such PCN particles reduces the momentum of the product residues.…”

Section: Introductionmentioning

confidence: 99%

Pre-compound emission in low-energy heavy-ion interactions

Sharma¹,

Shuaib

Sharma

et al. 2017

EPJ Web Conf.

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Abstract. Recent experimental studies have shown the presence of pre-compound emission component in heavy ion reactions at low projectile energy ranging from 4 to 7 MeV/nucleons. In earlier measurements strength of the pre-compound component has been estimated from the di↵erence in forward-backward distributions of emitted particles. Present measurement is a part of an ongoing program on the study of reaction dynamics of heavy ion interactions at low energies aimed at investigating the e↵ect of momentum transfer in compound, precompound, complete and incomplete fusion processes in heavy ion reactions. In the present work on the basis of momentum transfer the measurement of the recoil range distributions of heavy residues has been used to decipher the components of compound and pre-compound emission processes in the fusion of 16 O projectile with 159 Tb and 169 Tm targets. The analysis of recoil range distribution measurements show two distinct linear momentum transfer components corresponding to pre-compound and compound nucleus processes are involved. In order to obtain the mean input angular momentum associated with compound and pre-compound emission processes, an online measurement of the spin distributions of the residues has been performed. The analysis of spin distribution indicate that the mean input angular momentum associated with pre-compound products is found to be relatively lower than that associated with compound nucleus process. The pre-compound components obtained from the present analysis are consistent with those obtained from the analysis of excitation functions.

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Complete and incomplete fusion and emission of preequilibrium nucleons in the interaction ofC12with

Cited by 85 publications

References 27 publications

Gamma-ray multiplicity measurements in the28Si+64Ni reaction at 163.8 MeV

Gamma-ray multiplicity measurements in the28Si+64Ni reaction at 163.8 MeV

Charge distributions of Ra recoil ions produced in C12+Pb fusion-evaporation reactions

Pre-compound emission in low-energy heavy-ion interactions

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