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

Isospin Effect on the Slope Temperature at Backward Angles in the Reactions 30MeV/u 40Ar+112,124Sn

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

  • 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.
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    [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.
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. shu
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Received: 2000-07-26
Revised: 1900-01-01
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Isospin Effect on the Slope Temperature at Backward Angles in the Reactions 30MeV/u 40Ar+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/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.

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