Nuclear temperature and its dependence on the source neutron-proton asymmetry deduced using the Albergo thermometer

• Published in: Physical review. C 2021-01, Vol.103 (1), Article 014601
• Main Authors: Huang, Y., Zheng, H., Wada, R., Liu, X., Lin, W., Qu, G., Huang, M., Ren, P., Han, J., Bonasera, A., Hagel, K., Rodrigues, M. R. D., Kowalski, S., Keutgen, T., Barbui, M., Natowitz, J. B.
• Format: Article
• Language: English
• Subjects: Low & intermediate energy heavy-ion reactions; Nuclear fragmentation; Nuclear matter; NUCLEAR PHYSICS AND RADIATION PHYSICS
• ISSN: 2469-9985; 2469-9993
• DOI: 10.1103/PhysRevC.103.014601

Albergo thermometers with double isotope, isotone and isobar yield ratio pairs with one proton or/and neutron difference are investigated. Without any extra sequential decay correction, a real temperature value of 4.9 ± 0.5 MeV is deduced from the yields of the experimentally reconstructed primary hot intermediate mass fragments (IMFs) from 64Zn + 112Sn collisions at 40 MeV/nucleon using the Albergo thermometer for the first time. An experimental sequential decay correction from the apparent temperatures to the real ones for twelve other reaction systems with different neutron-proton (N/Z) asymmetries in the same experiment, 70Zn, 64Ni on 112,124Sn, 58,64Ni, 197Au, 232Th at 40 MeV/nucleon, is performed using an empirical correction factor approach of Tsang et al. with the deduced 4.9 MeV temperature value. The dependence of nuclear temperature on the source N/Z asymmetry is further investigated using these deduced real source temperature values from the present thirteen systems. It is found that the deduced real source temperatures at the present source N/Z range show a rather weak dependence on the source N/Z asymmetry. In conclusion, by comparison between our previous results and those from other independent experiments, a consistent description for the N/Z asymmetry dependence of nuclear temperature is addressed.