Temperatures and Excitation Energies of Hot Nuclei in the Reactions of 40Ar+natAg, 209Bi at 25 MeV/u

Yin Shuzhi; Jin Weiyang; Zhang Chun; Jin Genming; Zheng Jiwen; Wu Enjiu; Tan Jilian; Li Zuyu; Wang Sufang; Song Mingtao; Wu Heye; He Zhiyong; Jiang Dongxing; Qian Xing

Chinese Physics C> 1997, Vol. 21> Issue(S3) : 29-34

Temperatures and Excitation Energies of Hot Nuclei in the Reactions of ⁴⁰Ar+^natAg, ²⁰⁹Bi at 25 MeV/u

Yin Shuzhi ¹ ,
Jin Weiyang ¹ ,
Zhang Chun ¹ ,
Jin Genming ¹ ,
Zheng Jiwen ¹ ,
Wu Enjiu ¹ ,
Tan Jilian ¹ ,
Li Zuyu ¹ ,
Wang Sufang ¹ ,
Song Mingtao ¹ ,
Wu Heye ¹ ,
He Zhiyong ¹ ,
Jiang Dongxing ² ,
Qian Xing ²

1. Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou, China;
2. Department of Technical Physics, Beijing University

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Abstract：
Coincidence measurements of fission fragments and light-charged particles have been performed for the reactions of ⁴⁰Ar+^natAg, ²⁰⁹Bi at E/A=25 MeV using 4 PPAC and 11 sets of △E-E telescopes. Angular correlations of fission fragments are plotted as a function of the folding angle between the two detected fission fragments. The linear momentum transfer distributions are derived by measured angular correlation. The backward spectra of light particles detected in coincidence with fission fragments having different average <LMT> are analyzed with a Maxwell distribution. After some corrections the initial temperature of the hot nuclei is determined from the energy spectra. The excitation energies corresponding to the different average <LMT> are obtained considering the reaction Q values and pre-equilibration emission. In the central collision of the ⁴⁰Ar+^natAg, ²⁰⁹Bi reactions, excitation energies are measured to be about 4.2 MeV/u, 2.4 MeV/u and temperatures about 6.1 MeV, 5.5 MeV, respectively. In a semi-central collision, the measured excitation energies and temperatures are about 3.5 MeV/u, 1.9 MeV/u, and 5.8 MeV, 4.8 MeY, respectively.
- hot nuclei ,
- nuclear temperature ,
- excitation energy

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Yin Shuzhi, Jin Weiyang, Zhang Chun, Jin Genming, Zheng Jiwen, Wu Enjiu, Tan Jilian, Li Zuyu, Wang Sufang, Song Mingtao, Wu Heye, He Zhiyong, Jiang Dongxing and Qian Xing. Temperatures and Excitation Energies of Hot Nuclei in the Reactions of ⁴⁰Ar+^natAg, ²⁰⁹Bi at 25 MeV/u[J]. Chinese Physics C, 1997, 21(S3): 29-34.

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Received: 1996-08-20

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Supported by the National Natural Science Foundation of China.

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沈阳化工大学材料科学与工程学院沈阳 110142

Temperatures and Excitation Energies of Hot Nuclei in the Reactions of ⁴⁰Ar+^natAg, ²⁰⁹Bi at 25 MeV/u

1. Institute of Modern Physics, The Chinese Academy of Sciences, Lanzhou, China;
2. Department of Technical Physics, Beijing University

Received Date: 1996-08-20

Fund Project: Supported by the National Natural Science Foundation of China.

Abstract: Coincidence measurements of fission fragments and light-charged particles have been performed for the reactions of ⁴⁰Ar+^natAg, ²⁰⁹Bi at E/A=25 MeV using 4 PPAC and 11 sets of △E-E telescopes. Angular correlations of fission fragments are plotted as a function of the folding angle between the two detected fission fragments. The linear momentum transfer distributions are derived by measured angular correlation. The backward spectra of light particles detected in coincidence with fission fragments having different average <LMT> are analyzed with a Maxwell distribution. After some corrections the initial temperature of the hot nuclei is determined from the energy spectra. The excitation energies corresponding to the different average <LMT> are obtained considering the reaction Q values and pre-equilibration emission. In the central collision of the ⁴⁰Ar+^natAg, ²⁰⁹Bi reactions, excitation energies are measured to be about 4.2 MeV/u, 2.4 MeV/u and temperatures about 6.1 MeV, 5.5 MeV, respectively. In a semi-central collision, the measured excitation energies and temperatures are about 3.5 MeV/u, 1.9 MeV/u, and 5.8 MeV, 4.8 MeY, respectively.