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Energy Dependence of the Isotopic Composition in Nuclear Fragmentation

Energy Dependence of the Isotopic Composition in Nuclear Fragmentation. S. Yennello, D. Shetty , M. Veselsky , E. Martin, A. Keksis, G. Souliotis and D. Rowland Texas A&M University Cyclotron Institute. Two component liquid. Single component liquid. Two component liquid. Free n/p ratio

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Energy Dependence of the Isotopic Composition in Nuclear Fragmentation

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  1. Energy Dependence of the Isotopic Composition in Nuclear Fragmentation S. Yennello, D. Shetty, M. Veselsky, E. Martin, A. Keksis, G. Souliotis and D. Rowland Texas A&M University Cyclotron Institute

  2. Two component liquid Single component liquid Two component liquid Free n/p ratio t/3He ratio N/Zfragments Possible signatures:

  3. 124Sn 124Sn Veselsky, Phys. Rev. C62, 064613 (2000).

  4. Veselsky, Phys. Rev. C62, 064613 (2000).

  5. E*=3.5-4.5 E*=4.5-5.5 E*=2.5-3.5 E*=6.5-7.5 E*=5.5-6.5 E*=7.5-8.5 E*=9.5-10.5 E*=10.5-12.5 E*=8.5-9.5 28Si + 112,124Sn Veselsky,Phys Lett B497,1(2001)

  6. Ratio of isotopic yields58Ni, 58Fe + 58Ni, 58Fe 30 Mev/nuc

  7. Scaling factor

  8. D D D D D D Relative free neutron and proton densities

  9. Scaling factor at 30,40,47 MeV/nuc

  10. D D D D D D neutron and proton densities at 30,40,47 MeV/nuc

  11. Tsang PRC64, 054615 (2002) Energy dependence of the scaling parameter a 58Fe + 58Fe / 58Ni + 58Ni .

  12. Botvina IsoscalingR21 = C exp(a’A + b’(N-Z) a ’ = D(mn + mp)/2T b ’ = D(mn - mp)/2T 28Si + 112,124Sn 30 MeV/nuc 50 MeV/nuc b’ = 0.237±0.038 b’ = 0.186±0.017

  13. Botvina IsoscalingR21 = C exp(a’A + b’(N-Z) 28Si + 112,124Sn ; 50 MeV/nuc

  14. Summary • The enhancement in free neutrons of neutron-rich systems is greater at lower energies. • Isoscaling in 58Ni, 58Fe + 58Ni, 58Fe • 3H/3He in 28Si + 112Sn, 124Sn • Isoscaling in 28Si + 112Sn, 124Sn

  15. Baran Nucl Phys 1999 Chomaz PLB 47, 221 (1999) Theory Bao An Li PRL 2000

  16. Summary • The enhancement in free neutrons of neutron-rich systems is greater at lower energies. • Isoscaling in 58Ni, 58Fe + 58Ni, 58Fe • 3H/3He in 28Si + 112Sn, 124Sn • Isoscaling in 28Si + 112Sn, 124Sn • Theoretical comparisons are in progress. This work was supported in part by the Department of Energy and the Robert A Welch Foundation

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