Freeze-Out Density of the 35MeV/u <SUP>40</SUP>Ar+<SUP>197</SUP>Au Reaction

WEI Zhi-Yong; DUAN Li-Min; JIN Gen-Ming; WU He-Yu; LI Zu-Yu; SHEN Wen-Qing; XI Hong-Fei; ZHU Yong-Tai; ZHANG Bao-Guo; WANG Hong-Wei; XIAO Zhi-Gang; LIU Yong-Ying

Chinese Physics C> 2001, Vol. 25> Issue(9) : 839-844

Freeze-Out Density of the 35MeV/u ⁴⁰Ar+¹⁹⁷Au Reaction

Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou 730000, China2 Institute of Nuclear Research, The Chinese Academy of Sciences, Shanghai, 201800, China

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Light charged particles emitted from the reactions of 35MeV/u ⁴⁰Ar+¹⁹⁷Au have been measured. The slope nuclear temperature parameters and the isotope nuclear temperature parameters are extracted from the slope of energy spectra and double isotope yield ratios respectively, and on average, the slope temperatures are slightly larger than the isotope temperatures. The entropy values are extracted also with several methods by using the d/p ratios, d-like/p-like ratios, reduced yields of isotope d and the reduced multiplicities of charged particles M_red, respectively. The entropy values from the reduced yield of isotope d and the reduced multiplicity of charged particles M_red are nearly the same, and these two methods can be used in low beam energy heavy ion reactions. The charged particles emitted in rear angles are mainly from an equilibrium state source with temperature about (4.7±1.2) MeV and entropy S/A=2.5±0.5, from which the Freeze-out density can be deduced. It is nearly but less than 0.1 ρ₀.

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WEI Zhi-Yong, DUAN Li-Min, JIN Gen-Ming, WU He-Yu, LI Zu-Yu, SHEN Wen-Qing, XI Hong-Fei, ZHU Yong-Tai, ZHANG Bao-Guo, WANG Hong-Wei, XIAO Zhi-Gang, LIU Yong-Ying, Freeze-Out Density of the 35MeV/u ⁴⁰Ar+¹⁹⁷Au Reaction[J]. Chinese Physics C, 2001, 25(9): 839-844.

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Received: 2000-09-25
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沈阳化工大学材料科学与工程学院沈阳 110142

Freeze-Out Density of the 35MeV/u ⁴⁰Ar+¹⁹⁷Au Reaction

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Freeze-Out Density of the 35MeV/u ⁴⁰Ar+¹⁹⁷Au Reaction

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Freeze-Out Density of the 35MeV/u 40Ar+197Au Reaction

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Freeze-Out Density of the 35MeV/u 40Ar+197Au Reaction

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Freeze-Out Density of the 35MeV/u ⁴⁰Ar+¹⁹⁷Au Reaction

Freeze-Out Density of the 35MeV/u ⁴⁰Ar+¹⁹⁷Au Reaction