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- W1965884445 endingPage "2597" @default.
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- W1965884445 abstract "The light charged particles emitted from hot $^{40}mathrm{Ca}$ compound nuclei, populated at excitation energy ${mathit{E}}_{mathit{x}}$=94 MeV and 〈J〉=20.5ensuremath{Elzxh} by the reaction 130 MeV $^{16}mathrm{O}$ on $^{24}mathrm{Mg}$, have been studied. Energy spectra of protons and alpha particles, measured in coincidence with evaporation residues and with a selection of multiple-alpha chains, have been compared with the predictions of Monte Carlo statistical model calculations. The comparison shows that the level density of hot nuclei with Aensuremath{le}40, needed to account for the measured quantities, is well predicted by the Fermi-gas model using a level-density parameter ${mathit{a}}_{mathrm{eff}}$=A/8 ${mathrm{MeV}}^{mathrm{ensuremath{-}}1}$ up to excitation energy 〈${mathit{E}}_{mathrm{th}}$/A〉ensuremath{sim}1.7 MeV. In agreement with theory, light hot nuclei do not show the transition from ${mathit{a}}_{mathrm{eff}}$=A/8 ${mathrm{MeV}}^{mathrm{ensuremath{-}}1}$ to ${mathit{a}}_{mathrm{eff}}$ensuremath{sim}A/13 ${mathrm{MeV}}^{mathrm{ensuremath{-}}1}$ evidenced in the Aensuremath{sim}160 mass region for the same range of excitation energies ${mathit{E}}_{mathrm{th}}$/A. The analysis of the alpha-particle spectra shows that the effects associated with the angular-momentum-induced deformations depend on the entrance channel characteristics and, in this case, are very small compared with those evidenced in the past for compound nuclei in the region A=50--70." @default.
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- W1965884445 date "1991-12-01" @default.
- W1965884445 modified "2023-10-18" @default.
- W1965884445 title "Level density of hot nuclei withA≤40" @default.
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- W1965884445 doi "https://doi.org/10.1103/physrevc.44.2588" @default.
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