Temperature and excitation energy of hot nuclei in the reaction of 40Ar+197Au at 25 MeV/nucleon |
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| Institution: | 1. Institute for Nuclear Research, 03028 Kyiv, Ukraine;2. Cyclotron Institute, Texas A&M University, College Station, TX 77843, USA;1. Key Laboratory of Luminescence and Optical Information (Beijing Jiaotong University), Ministry of Education, Beijing 100044, China;2. Institute of Optoelectronics Technology, Beijing Jiaotong University, Beijing 100044, China;3. Department of Mathematics and Physics, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;4. Institute of Applied Physics, Shijiazhuang Tiedao University, Shijiazhuang 050043, China;5. China Institute of Atomic Energy, P. O. Box 275 (10), Beijing 102413, China;1. Department of Physics and Astronomy, Texas A&M University-Commerce, Commerce, TX 75429-3011, USA;2. College of Science, University of Shanghai for Science and Technology, Shanghai, 200093, China;3. Department of Applied Physics, Xi''an Jiaotong University, Xian 710049, China;4. INPAC, Department of Physics and Astronomy and Shanghai Key Laboratory for Particle Physics and Cosmology, Shanghai Jiao Tong University, Shanghai 200240, China;5. Center of Theoretical Nuclear Physics, National Laboratory of Heavy Ion Accelerator, Lanzhou 730000, China;1. School of Nuclear Science and Technology, Lanzhou University, Lanzhou 730000, People''s Republic of China;2. Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, People''s Republic of China;3. School of Information Engineering, Hangzhou Dianzi University, Hangzhou 310018, People''s Republic of China;1. Department of Physics, Payame Noor University, P.O. Box 19395-4697, Tehran, Iran;2. Medical Physics Department, School of Medicine, Iran University of Medicine Science, P.O. Box: 14155-6183, Tehran, Iran |
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| Abstract: | The coincidence measurements between heavy fission fragments and light charged particles with Z ? 2 were carried out for the 40Ar+197Au reaction at 25 MeV/nucleon, to study the properties of hot nuclei in heavy ion induced reactions. The linear momentum transfers (LMTs) were deduced from the folding angle and the time-of-flight difference between two fission fragments of heavy residues. The relationship of the nuclear temperature (slope parameter of the energy spectrum) and the excitation energy was determined independently from the measurement of the kinetic energy spectra in the frames of the emitting sources and from the LMT analysis. Both the temperature and the excitation energy increase with decreasing impact parameter, which suggests that a plateau temperature of 5.5 MeV is reached at an excitation energy of 3.1 MeV/nucleon. The result was also compared with various statistical models that explain the plateau by the multifragmentation process, where the excitation energy is assumed to be stored in compression and expansion effects. |
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