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

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

Chinese Physics C> 1997, Vol. 21> Issue(8) : 680-685

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

Institute of Modern Physics,The Chinses Academy of Sciences,Lanzhou 7300001 Department of Technical Physics,Beijing University,Beijing 100871

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

References

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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 Heyu, He Zhiyong, Jiang Dongxing and Qian Xing. Temperatures and Excitation Energies of Hot Nuclei in Reactions of ⁴⁰Ar+^natAg,²⁰⁹Bi at MeV/u[J]. Chinese Physics C, 1997, 21(8): 680-685.

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Received: 1900-01-01
Revised: 1900-01-01

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通讯作者: 陈斌, bchen63@163.com

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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 Reactions of ⁴⁰Ar+^natAg,²⁰⁹Bi at MeV/u

Corresponding author: Yin Shuzhi,

Institute of Modern Physics,The Chinses Academy of Sciences,Lanzhou 7300001 Department of Technical Physics,Beijing University,Beijing 100871

Received Date: 1900-01-01

Accepted Date: 1900-01-01

Available Online: 1997-08-05

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

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

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

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