Chinese Physics C > 1998, Vol. 22 > Issue(8): 678-683

Space-Time Evolution During Emission of Intermediate Mass Fragmentform⁴⁰Ar+¹⁵⁹Tb Reaction at 30 MeV/u

Instintute of Modern Physics, The Chinese Academy of Sciences. Lanzhou 730000

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Abstract：
The emission time of intermediate mass fragments has been studied as afunction of spatial evolution of the source for ⁴⁰Ar+ ¹⁵⁹Tb reaction at 30 MeV/u.Reduction of the mass number of source has a very small effect on the extractedemission time. For the high-energy fragments with a short emission time ≤100fm/c,a smaller nuclear density would lead to a smaller assignment for, therefore thevalues extracted in the normal nuclear density could be taken as upper limits of realvalues. For the low-energy fragments, their emission times do not vary with size ofthe source and these values could be taken as real values.

References

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Fox D et al. Phys. Rev., 1993, C47(2):R421-R424[2] Bauge E et al. Phys. Rev. Lett., 1993, 70(24):3705--3708[3] Kim Y D et al. Phys. Rev. Lett, 1991, 67(1): 14-17[4] Comell E et al. Phys. Rev. Lett., 1995, 75(8): 1475-1478[5] He Zhiyong et al. Acta Physica Sinica, 1997, 46(7): 1312-1318[6] He Zhiyong et al. High Energy Physics and Nuclear Physics (in Chinese), 1996, 20(1):8--12; 1996, 20(7):596-600(贺智勇等。高能物理与核物理,1996,20(1):8-12:1996,20(7):596-600)[7] He Zhiyong et al. Chinese Physics Letters, 1995, 12(9):521-523; 1996, 13(3):168-171[8] He Zhiyong et al. Nucl. Phys., 1997, A620(2):.214-228[9] He Zhiyong et al. Eur. Phys. J., 1998, A1:61-64[10] Elmaani A et al. Nucl. Instr. Meth., 1992, A313:401-412[11] Xi Hongfei et al. Nucl. Phys., 1993, A552:281-292[12] Pochodzalla J et al. Phys. Rev., 1987, C35(5): 1695-1719

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He Zhiyong, Li Zuyu, Duan Limin, Zhang Baoguo, Jin Genming, Dai guangxi, Wang Hongwei and Fu Yanbiao. Space-Time Evolution During Emission of Intermediate Mass Fragmentform ⁴⁰Ar+ ¹⁵⁹Tb Reaction at 30 MeV/u[J]. Chinese Physics C, 1998, 22(8): 678-683.

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

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沈阳化工大学材料科学与工程学院沈阳 110142

Space-Time Evolution During Emission of Intermediate Mass Fragmentform⁴⁰Ar+¹⁵⁹Tb Reaction at 30 MeV/u

Corresponding author:He Zhiyong,

Instintute of Modern Physics, The Chinese Academy of Sciences. Lanzhou 730000

Received Date:1900-01-01
Accepted Date:1900-01-01
Available Online:1998-08-05

Abstract:The emission time of intermediate mass fragments has been studied as afunction of spatial evolution of the source for⁴⁰Ar+¹⁵⁹Tb reaction at 30 MeV/u.Reduction of the mass number of source has a very small effect on the extractedemission time. For the high-energy fragments with a short emission time ≤100fm/c,a smaller nuclear density would lead to a smaller assignment for, therefore thevalues extracted in the normal nuclear density could be taken as upper limits of realvalues. For the low-energy fragments, their emission times do not vary with size ofthe source and these values could be taken as real values.