Summary
Emission yieldsY(A) of isotopically resolved intermediatemass fragments, at large angles and in a wide range ofA, are suitably analysed to evaluate the temperatureT and the total free-nucleon densityϱ t F of the emission sources. For all the here studied high-energy proton-induced reactions, the evaluated temperatures are limited between ∼2 and ∼4 MeV. TheT andϱ t F values found for such nuclear sources allow us to extend to lower temperatures the knowledge of the (T, ϱ t F) correlation previously pointed out, for temperatures between ∼4 and ∼20 MeV, by analysing light-cluster emission in heavy-ion collisions. A nuclear-matter model is formulated in order to give a quantitative interpretation of the observed correlation. A remarkable agreement is obtained by comparing the quantitative predictions of the model with all the evaluated (T, ϱ t F) pairs.
Riassunto
Mediante un’opportuna analisi delle rese di emissioneY(A) di frammenti di massa intermedia rivelati con risoluzione isotopica, a grandi angoli e in un ampio intervallo diA, si valutano la temperatureT e la densità di nucleoni liberiϱ t F delle sorgenti emittenti. Per tutte le reazioni indotte da protoni di alta energia studiate nel presente lavoro le temperature calcolate sono comprese tra ∼2 e ∼4 MeV. I valori diT eϱ t F trovati per queste sorgenti nucleari permettono di estendere a piú basse temperature la conoscenza della correlazione (T, ϱ t F) precedentemente messa in evidenza, per temperature tra ∼4 e ∼20 MeV, analizzando l’emissione di particelle leggere in collisioni tra ioni pesanti. Si formula un modello della materia nucleare al fine di dare un’interpretazione quantitativa della correlazione osservata. Un ottimo accordo si riscontra confrontando le previsioni quantitative del modello con tutti i valori dedotti per le coppie (T, ϱ t F).
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Albergo, S., Costa, S., Costanzo, E. et al. Thermodynamic quantities deduced from the emission at large angles of isotopically resolved composite particles. Nuov Cim A 94, 151–169 (1986). https://doi.org/10.1007/BF02894869
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DOI: https://doi.org/10.1007/BF02894869