Abstract
The systematic study of the properties of hot nuclei by detecting the emitted charged particles and neutrons in coincidence with residual nuclei provides very critical information about its nuclear level density. These emitted particles capable to explain the behavior of the nucleus at various stages of the de-excitation cascade process. So, we have studied, a set of four compound nuclei, which were populated by mass-symmetric and mass-asymmetric channels, leading to the same compound nuclei, namely 80 Sr* , 79 Se* , 76 Kr* and 58 Ni* at same excitation energies, respectively and found that the experimental neutron and charged particle spectra for symmetric channel show deviations at higher energies in comparison to the statistical model calculations.
Highlights
The statistical model has been used for many decades to analyze a variety of observables related to the compound nucleus decay
In order to understand the behavior of nuclear reaction dynamics more clearly, we have compared the experimental charged-particle spectra for 76Kr* with statistical model calculations using the normal-level density parameter a=A/8 for alpha and protons in Figs. 4(a) and 4(b) for asymmetric and symmetric systems
It was observed that neutron energy spectra for asymmetric systems are well described by statistical model predictions using the normal value of the level density parameter a =A/8 MeV−1
Summary
The statistical model has been used for many decades to analyze a variety of observables related to the compound nucleus decay. In the case of the compound nuclei at moderate energies and angular momenta, such as those produced with light ion projectiles, the experimental charged particle spectra are well explained in terms of the statistical model, employing the optical model transmission coefficients. In the case of heavy ion induced fusion reactions, there have been several claims of serious discrepancies between the predictions of the standard statistical model and the measured light charged particle energy spectra [1,2,3,4]. Measured light charged particle spectra have been characterized as having lower energy than predicted. It is observed that these spectra may be well explained in terms of the statistical model incorporating only a spin dependent level density and without lowering the emission barriers [5]. In order to confirm these observations, we have studied four compound systems (80Sr*, 79Se*, 76Kr* and 58Ni*), through mass-symmetric channel and massasymmetric channels at same excitation energies, respectively
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