Heavy fragment emission in alpha-induced reactions on aluminum at 60 MeV

Bhattacharya, C.; Basu, Sourav; Bhattacharya, S.; Chattopadhyaya, Somnath; DuttaMajumdar, M. R.; Krishan, K.; Murthy, G. S. N.; Sinha, Bikash K.; Trivedi, M. D.; Viyogi, Y. P.; Datta, S. K. De; Bhowmik, R. K.

doi:10.1103/physrevc.44.1049

Cited by 12 publications

(17 citation statements)

References 25 publications

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“…The increase in the radius parameter r 0 is ∼ 20% which also agrees well with the other observations available in the literature [1]. Interestingly, similar deformation effects have been observed in our earlier studies on intermediate mass fragment (IMF) emission from the same 31 P nucleus [10]. In summary, we have measured α-particle energy spectra in coincidence with the evaporation residues.…”

supporting

confidence: 80%

Evaporation ofαparticles from the31Pnucleus

Bandyopadhyay

Basu²,

Bhattacharya³

et al. 1999

Phys. Rev. C

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The energy spectra of α-particles have been measured in coincidence with the evaporation residues for the decay of the compound nucleus 31 P, produced in the reaction 19 F (96 MeV) + 12 C. The data have been compared with the predictions of the statistical model code CASCADE. It has been observed that significant deformation effect in the compound nucleus need to be considered in order to explain the shape of the evaporated α-particle energy spectra.One of the main motivations of the low energy heavy ion reactions studies has been to extract informations on the statistical properties of the hot, rotating nuclei. The informations on the main ingredients of the statistical description, i.e., the nuclear level densities and the barrier transmission probabilities, are usually obtained from the study of the evaporated light particle spectra. The validity of the statistical model depends crucially on the successful description of the light particle emission data and the model, so far, has been overwhelmingly successful in explaining a wide variety of nuclear reaction data in low energy regime. In this perspective, recent studies on the evaporated α-particle energy spectra has evoked a lot of interest (see, for example, ref.[1] and references therein). It has been observed that the standard statistical model calculations failed to predict the shape of the evaporated α-particle energy spectra satisfactorily. A large number of experiments have been performed to study this anomaly over a wide range of compound nuclear masses A CN in the range of ∼60-170 [1-6], and in all cases it has been found that the average energies of the measured α-particle energy spectra are much lower than the corresponding theoretical predictions. Several attempts have been made in the past few years to explain this anomaly. Some of the authors [2,3] argued that the discrepancy was due to the lowering of the emission barriers of the hot nuclei as compared to the fusion barriers for the corresponding relatively 'cold' inverse absorption channels as a result of the excitation energy and angular momentum dependent deformation of the emitting system in the former. On the other hand, there is another group of authors who claim that the anomaly may be well explained by incorporating spin dependent level density in the standard statistical model prescription and emission barriers need not be changed [4,5]. Moreover, it has also been observed that the magnitude of the discrepancy has some entrance channel dependence [6], the discrepancy being more for the more symmetric entrance channels. This is indicative of the fact that the magnitude of the phenomena may also be linked with the entrance channel dynamics of the system. Intuitively, the shape of the α-particle spectra would be affected by the deformation of the equilibrating system if it remains deformed over a time scale comparable to the mean life time of α emission. For heavier nuclei (A CN > 60), the theoretical calculations of shape equilibration time, using the code HICOL [1,7] show that these ti...

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supporting

confidence: 80%

Evaporation ofαparticles from the31Pnucleus

Bandyopadhyay

Basu²,

Bhattacharya³

et al. 1999

Phys. Rev. C

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“…at 20 degrees by Bhattacharya et al [10]. As shown in this figure, present results for 70 MeV at 30 degrees are in fair agreement with data for 60 MeV, at 20 degrees with considering difference of incident energy and emission angle.…”

Section: Methodssupporting

confidence: 90%

“…For incident ions, however less data and comparisons are available in this energy range. Bhattacharya et al reports asymmetric binary splitting of the compound nucleus and another mechanism for Li and Be at forward angle in his paper for the 27 Al(He,x) reaction at E he = 60 MeV [10]. Förtsch et al reports contribution of complete fusion and break-up-fusion to intermediate mass a e-mail: toshiya.sanami@kek.jp fragment production for the 27 Al( 12 C,x) reaction at E 12C = 156 MeV [11].…”

Section: Introductionmentioning

confidence: 99%

Double differential cross section for light mass fragment production on tens of MeV proton, deuteron, helium and carbon induced reactions

Sanami

Yamaguchi

Uozumi³

et al. 2017

EPJ Web Conf.

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Abstract. Double differential cross sections (DDXs) of light mass fragment (LMFs -Li,Be,B,C,N and O) productions were measured for tens of MeV proton, deuteron helium and carbon induced reactions on Be, C, Al, Ti and Cu targets. The incident energies for the measurements were chosen to allow us to compare DDXs with same incident energy but different projectiles on various targets. Systematic data were obtained to see the differences between projectile energies, particles, targets and emitted particles. From the comparison, reaction processes of not only evaporation from complete fusion nucleus, but also scattering, pickup, stripping and projectile fragmentation were observed.

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“…A similar situation prevails in case of e-induced reactions, also [10]. However, no systematic evaluation of relative contributions of equilibrium and non-equilibrium emission processes have been done so far in case of e-induced reactions.…”

Section: Introductionmentioning

confidence: 76%

“…Two systems e+27A1 at 60 MeV [10] and e+r at 104 MeV [7] have been chosen for the present studies. It is known that the statistical decay of equilibrated composite can explain fairly well the total IMF emission cross-sections for heavier fragments (typically, Z>6) emitted in light ion (e, 3He, 6Li) induced reactions [11].…”

Section: The Phenomenological Analysismentioning

confidence: 99%

Phenomenological analysis of intermediate mass fragments emission in alpha induced reactions

Bhattacharya

Krishan

1993

Z. Physik A - Hadrons and Nuclei

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Abstract.Intermediate mass fragment emission in e induced reactions on A1 and Ti at 60 and 104 MeV, respectively has been analysed using phenomenological moving source model. Fragment emission at backward angles is found to be well explained by a single fusion-like source, whereas for forward angles an additional intermediate velocity source is required to explain the data. The relative contribution of the intermediate velocity source decreases sharply with angle for lower energies and it extends significantly to larger angles in the higher energy reaction. The fractional momentum transfer for the fusion-like source is in agreement with the corresponding Viola systematics value in the case of ~+A1 reaction, whereas for e + Ti reaction, it is larger than that obtained from the Viola systematics. The degree of incompleteness (in momentum transfer) is found to be fragment dependent; incompleteness being more for lighter fragments and vice-versa. PACS: 25.55.

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Heavy fragment emission in alpha-induced reactions on aluminum at 60 MeV

Cited by 12 publications

References 25 publications

Evaporation ofαparticles from the31Pnucleus

Evaporation ofαparticles from the31Pnucleus

Double differential cross section for light mass fragment production on tens of MeV proton, deuteron, helium and carbon induced reactions

Phenomenological analysis of intermediate mass fragments emission in alpha induced reactions

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