Alpha particles and protons emitted in the S-32 + Ge-74 reaction at E = 160,210,259,335 and 435 MeV were measured in coincidence with evaporation residues. The average inverse level-density parameter [K] for hot evaporation residues with A approximately 100 was obtained by comparing the slope of the charged-particle spectra with the predictions from a full statistical model calculation. Spectral shapes are well reproduced by calculations using the standard values [K] = 7.5 MeV,except for alpha particles at the highest bombarding energy,which corresponds to an excitation energy epsilon = 2.2 MeV/nucleon. The present results are compared with other experimental investigations in the A approximately 100 and A approximately 160 regions and with predictions from theoretical models. Difficulties in extracting the nuclear temperature from the slope of the particle spectra for A approximately 100 are discussed.
TESTING THE LEVEL DENSITY OF A SIMILAR-TO-100 HOT NUCLEI FROM EVAPORATIVE CHARGED-PARTICLE SPECTRA / Nebbia, G.; Fabrisa, D.; Perin, A.; Viestia, G.; Gramegnab, F.; Prete, G.; Fiore, L.; Paticchio, V.; Lucarelli, Franco; Chambon, B.; Cheynis, B.; Drain, D.; Giorni, A.; Lleres, A.; Viano, J. B.. - In: NUCLEAR PHYSICS. A. - ISSN 0375-9474. - STAMPA. - 578:(1994), pp. 285-299. [10.1016/0375-9474]
TESTING THE LEVEL DENSITY OF A SIMILAR-TO-100 HOT NUCLEI FROM EVAPORATIVE CHARGED-PARTICLE SPECTRA
LUCARELLI, FRANCO;
1994
Abstract
Alpha particles and protons emitted in the S-32 + Ge-74 reaction at E = 160,210,259,335 and 435 MeV were measured in coincidence with evaporation residues. The average inverse level-density parameter [K] for hot evaporation residues with A approximately 100 was obtained by comparing the slope of the charged-particle spectra with the predictions from a full statistical model calculation. Spectral shapes are well reproduced by calculations using the standard values [K] = 7.5 MeV,except for alpha particles at the highest bombarding energy,which corresponds to an excitation energy epsilon = 2.2 MeV/nucleon. The present results are compared with other experimental investigations in the A approximately 100 and A approximately 160 regions and with predictions from theoretical models. Difficulties in extracting the nuclear temperature from the slope of the particle spectra for A approximately 100 are discussed.
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