Summary
A new statistical approach is adopted which, through a suitable analysis of light clusters emitted in heavy-ion collisions, allows us to evaluate temperature and free-nucleon densities of the emission source. All known data concerning the emission of2H,3H,3He,4He measured in a common experiment are used. These data refer to 19 heavy-ion reactions studied at projectile energies between 26 and 2100 MeV per nucleon. Analysed events are only those attributable to the equilibrium component through carefully adopted selections. Among the results, a correlation is observed between temperatureT and total free-nucleon density ϱt F of the emission source. A nuclear-matter model is formulated in order to compare its quantitative predictions with the observed (T, ϱ t F) correlation. A good agreement is found by this comparison.
Riassunto
Si adotta un nuovo approccio statistico che, mediante un’opportuna analisi delle particelle leggere emesse nelle reazioni tra ioni pesanti, permette di calcolare le densità dei nucleoni liberi e la temperatura della sorgente di emissione. Si usano tutti i dati noti riguardanti l’emissione di2H,3H,3He,4He misurati in un unico esperimento. Questi dati si riferiscono a 19 reazioni tra ioni pesanti studiate a energie comprese tra 26 e 2100 MeV per nucleone. Gli eventi analizzati sono soltanto quelli che, mediante accurate selezioni, possono essere attribuiti alla componente di equilibrio. Tra i risultati, si osserva una correlazione tra la densità totale dei nucleoni liberi ϱt F e la temperaturaT della sorgente. Si formula un modello della materia nucleare per confrontare le previsioni quantitative di tale modello con la correlazione osservata traT e28-2. Questo confronto dà un accordo soddisfacente.
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Albergo, S., Costa, S., Costanzo, E. et al. Temperature and free-nucleon densities of nuclear matter exploding into light clusters in heavy-ion collisions. Nuov Cim A 89, 1–28 (1985). https://doi.org/10.1007/BF02773614
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DOI: https://doi.org/10.1007/BF02773614