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Analysis of the 206 Pb(n, g ) cross section

Analysis of the 206 Pb(n, g ) cross section. M1. E2. +10%. -10%. Angular distribution effects in the capture yield. 3/2 -. Analysis of the 206 Pb(n, g ) cross section. M1. E2. +10%. -10%. Angular distribution effects in the capture yield. 3/2 -. s (MACS) = 3-4%.

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Analysis of the 206 Pb(n, g ) cross section

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  1. Analysis of the 206Pb(n,g) cross section M1 E2 +10% -10% • Angular distribution effects in the capture yield 3/2-

  2. Analysis of the 206Pb(n,g) cross section M1 E2 +10% -10% • Angular distribution effects in the capture yield 3/2-

  3. s(MACS) = 3-4% 206Pb(n,g) Maxwellian Average CS (MACS) • Resonances 1/2 show NO angular distribution effect • Resonances 5/2 do show, but their contribution to the total CS is negligible.

  4. -20% -9% 206Pb(n,g) Maxwellian Average CS (MACS) s(MACS) = 3-4% • Bao et al. based on ORNL Exp, Mizumoto 1979, who used two C6F6 at 90o • Imortant to quantify the effect of the angular distribution

  5. 206Pb(n,g) Maxwellian Average CS (MACS) • Mughabghab 2006 based on A. Borella's private com. from Geel Exp. • Geel setup also 125osimilar to n_TOF setup

  6. All n_TOF Pb/Bi Maxwellian Average CS (MACS) • R. Gallino • S. Bisterzo

  7. Some preliminary astrophysical implications 238U T1/2=4.5x109y N8(206Pb) = 0.6009(8%) (Lodders 2003) Ns(206Pb) = 0.4206(9%) (This Work + AGB-Model Calc.) Nr(206Pb) = Nr(209Bi)x8/12 = 0.075(9%) (209Bi MACS + AGB + Approx.) Nrad(206Pb) = N8(206Pb) - Ns(206Pb) - Nr(206Pb) = 0.105(15%) N8(238U) = 0.0187(8%) (Lodders 2003)

  8. Some preliminary astrophysical implications Fowler's exponential model D= 6.7(1.0) Gy D time duration of r-nucleosynthesis l decay rate of 238U lr supernova rate (-1.5 to -2x10-10 y) T= D + 4.6 + 0.5 = 12(1) Gy N8(206Pb) = 0.6009(8%) (Lodders 2003) Ns(206Pb) = 0.4206(9%) (This Work + AGB-Model Calc.) Nr(206Pb) = Nr(209Bi)x8/12 = 0.075(9%) (209Bi MACS + AGB + Approx.) Nrad(206Pb) = N8(206Pb) - Ns(206Pb) - Nr(206Pb) = 0.105(15%) N8(238U) = 0.0187(8%) (Lodders 2003)

  9. The paper

  10. 125o The problem of the angular distribution with C6D6

  11. 125o The problem of the angular distribution with C6D6

  12. 125o The problem of the angular distribution with C6D6

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