Neutron-proton asymmetry dependence of nuclear temperature with intermediate mass fragments

X. Liu (刘星泉), H. Zheng (郑华), R. Wada, W. Lin (林炜平), M. Huang (黄美容), P. Ren (任培培), G. Qu (曲国峰), J. Han (韩纪锋), M. R. D. Rodrigues, S. Kowalski, T. Keutgen, K. Hagel, M. Barbui, A. Bonasera, and J. B. Natowitz

Phys. Rev. C 100, 064601 – Published 4 December 2019

Abstract

The dependence of the nuclear temperature on the source neutron-proton ( $N / Z$ ) asymmetry is experimentally investigated with the intermediate mass fragments (IMFs) generated from thirteen reaction systems with different $N / Z$ asymmetries, ${}^{64}{Zn}$ on ${}^{112}{Sn}$ and ${}^{70}{Zn}, {}^{64}{Ni}$ on ${}^{112, 124}{Sn}, {}^{58, 64}{Ni}, {}^{197}{Au}, {}^{232}{Th}$ at 40 MeV/nucleon. The apparent source temperatures for these systems are determined from the measured IMF yields from the intermediate velocity sources using eight carbon-related double isotope ratio thermometers. A rather weak $N / Z$ asymmetry dependence of the source temperature is qualitatively inferred from the extracted $N / Z$ asymmetry dependence of the apparent temperature and that of the relative temperature change by the sequential decay effects with the help of the theoretical simulations. The present result is compared with those from other available experiments.

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Received 27 April 2019
Revised 27 August 2019

DOI:https://doi.org/10.1103/PhysRevC.100.064601

Physics Subject Headings (PhySH)

Nuclear fragmentation Nuclear reactions

Nuclear Physics

Authors & Affiliations

X. Liu (刘星泉)^1,2, H. Zheng (郑华)³, R. Wada^4,5, W. Lin (林炜平)^1,*, M. Huang (黄美容)⁶, P. Ren (任培培)¹, G. Qu (曲国峰)¹, J. Han (韩纪锋)¹, M. R. D. Rodrigues⁷, S. Kowalski⁸, T. Keutgen⁹, K. Hagel⁴, M. Barbui⁴, A. Bonasera^4,10, and J. B. Natowitz⁴

¹Key Laboratory of Radiation Physics and Technology of the Ministry of Education, Institute of Nuclear Science and Technology, Sichuan University, Chengdu 610064,China
²Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, China
³School of Physics and Information Technology, Shaanxi Normal University, Xi'an 710119, China
⁴Cyclotron Institute, Texas A&M University, College Station, Texas 77843, USA
⁵School of Physics, Henan Normal University, Xinxiang 453007, China
⁶College of Physics and Electronics information, Inner Mongolia University for Nationalities, Tongliao, 028000, China
⁷Instituto de Física, Universidade de São Paulo, Caixa Postal 66318, CEP 05389-970, São Paulo, SP, Brazil
⁸Institute of Physics, Silesia University, Katowice, Poland
⁹FNRS and IPN, Université Catholique de Louvain, B-1348 Louvain-Neuve, Belgium
¹⁰Laboratori Nazionali del Sud, INFN, via Santa Sofia, 62, 95123 Catania, Italy

^*linwp1204@scu.edu.cn

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Vol. 100, Iss. 6 — December 2019

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