Chinese Physics C > 2001, Vol. 25 > Issue(7): 643-650

Isospin Effect on the Slope Temperature at Backward Angles in the Reactions 30MeV/u⁴⁰Ar+^112,124Sn

Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China

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Abstract：
The coincidence measurements between residues and light particles have been carried out for the reactions 30MeV/u ⁴⁰Ar+ ^112,124Sn. The times of flight of the residues are measured by PPACs installed concentrically around the beam at forward angle. The spectra of ³He,α and ⁶He detected at backward angle in coincidence with residues having different average velocities are analyzed with moving source fit. The average excitation energy of hot nuclei is obtained in the incomplete fusion frame. It is shown that the slope temperature extracted from ³He( ⁶He) spectra is higher (lower) in the neutron-rich system ⁴⁰Ar+ ¹²⁴Sn than that in the neutron-deficient system ⁴⁰Ar+ ¹¹²Sn. For α particle. there is almost no difference between the two reaction systems. The possible causality of these systematic behaviors is discussed from the selectivity of the emitting particles along the decay chain of hot nuclei. The calculation of GEMINI can not repsoduce the experimental observations.

References

[1]

. Wada R ,Fabris D ,Hagel K et al.Phys.Rev.,1989,C39:497—515 2. WU H Y,JIN G M,LI Z Y et al.Nucl.Phys.,1997,A6 17:385—394 3. JIN Gen-Ming,WU He-Yu.Research on the Excitation Energy and Properties of Hot-Nuclei,Nuclear Far From Stable Line and Hot Nuclei,edit by JIN Gen-Ming and SA Ben-Hao,Beijing,May,1995,32 1;JIN Gen-Ming .Nucl.Phys.Rev.,1998,15:227— 235(in Chinese)(靳根明.原子核物理评论,1998,15:227—235)4. Hauger J A ,Albergo S ,Bieser F et al.Phys.Rev.Lett.,1996,77:235—238 5. Hauger J A ,Warren P ,Albergo S et al.Phys.Rev.,1998,C57:764 6. WEI Zhi-Yong ,ZHU Yong-Tai.Nucl.Phys.Rev.,1997,14:76—78(in Chinese)(魏志勇,诸永泰.原子核物理评论,1997,14:76—78) 7. XI H F,Kunde G J,Bjarki O et al.Phy .Rev.,1998,C58:R2 6 368. Tsang M B,Zhu F,Lynch W G et al.Phys.Rev.,1996,C53:R10579. Pochadzalla J,Mhlenkamp T,Rubehn T et al.Phys.Rev.Lett.,1995,75:1040—1043 10. LI B A ,Ko C M,Bauer W.International Journal of Modern Physics,1998,E7:147 11. WU He-Yu,XIAO Zhi-Gang,LI Zu-Yu et al.High Energy Phys.and Nucl.Phys.,1999,23:1115(in Chinese)(吴和宇,肖志刚,李祖玉等.高能物理与核物理,1999,23:1115)12. DAI Guang-Xi,HE Zhi-Yong ,FU Yan-Biao et al.High Energy Phys.and Nucl.Phys.,1999,23:2 23—230 (in Chinese)(戴光曦,贺智勇,符彦飚等.高能物理与核物理,1999,23:223—230) 13. DUAN Li-Min,WANG Su-Fang,ZHANG Bao-Guo et al.High Energy Phys.and Nucl.Phys.,1998,22:780—786 (in Chinese)(段利敏,王素芳,张保国等.高能物理与核物理,1999,2 2:780—786)

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XIAO Zhi-Gang, WU He-Yu, WANG Hong-Wei, LI Zu-Yu, JIN Gen-Ming, DUAN Li-Min, ZHANG Bao-Guo, HU Rong-Jiang, WEI Zhi-Yong, LIU Yong-Ying, WANG Su-Fang, LU Zhao-Hui, ZHU Yong-Tai and ZHU Hai-Dong. Isospin Effect on the Slope Temperature at Backward Angles in the Reactions 30MeV/u ⁴⁰Ar+ ^112,124Sn[J]. Chinese Physics C, 2001, 25(7): 643-650.

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Received: 2000-07-26
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

Isospin Effect on the Slope Temperature at Backward Angles in the Reactions 30MeV/u⁴⁰Ar+^112,124Sn

Corresponding author:XIAO Zhi-Gang,

Institute of Modern Physics,The Chinese Academy of Sciences,Lanzhou 730000,China

Received Date:2000-07-26
Accepted Date:1900-01-01
Available Online:2001-07-05

Abstract:The coincidence measurements between residues and light particles have been carried out for the reactions 30MeV/u⁴⁰Ar+^112,124Sn. The times of flight of the residues are measured by PPACs installed concentrically around the beam at forward angle. The spectra of³He,α and⁶He detected at backward angle in coincidence with residues having different average velocities are analyzed with moving source fit. The average excitation energy of hot nuclei is obtained in the incomplete fusion frame. It is shown that the slope temperature extracted from³He(⁶He) spectra is higher (lower) in the neutron-rich system⁴⁰Ar+¹²⁴Sn than that in the neutron-deficient system⁴⁰Ar+¹¹²Sn. For α particle. there is almost no difference between the two reaction systems. The possible causality of these systematic behaviors is discussed from the selectivity of the emitting particles along the decay chain of hot nuclei. The calculation of GEMINI can not repsoduce the experimental observations.