analysis of the 206 pb(n, g ) cross section
DESCRIPTION
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%. - PowerPoint PPT PresentationTRANSCRIPT
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Analysis of the 206Pb(n,) cross section
•Angular distribution effects in the capture yield
)(cos5.01)( 2 PW )(cos5.01)( 2 PW
%42/3
3/2-
M1 E2
+10% -10%
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Analysis of the 206Pb(n,) cross section
•Angular distribution effects in the capture yield
)(cos5.01)( 2 PW )(cos5.01)( 2 PW
%42/3
3/2-
M1 E2
+10% -10%
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206Pb(n,) Maxwellian Average CS (MACS)
%42/3
(MACS) = 3-4%
• Resonances 1/2 show NO angular distribution effect
• Resonances 5/2 do show, but their contribution to the total CS is negligible.
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206Pb(n,) Maxwellian Average CS (MACS)
%42/3
(MACS) = 3-4%
-20%
-9%
• Bao et al. based on ORNL Exp, Mizumoto 1979, who used two C6F6 at 90o
• Imortant to quantify the effect of the angular distribution
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206Pb(n,) Maxwellian Average CS (MACS)
• Mughabghab 2006 based on A. Borella's private com. from Geel Exp.
• Geel setup also 125o similar to n_TOF setup
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All n_TOF Pb/Bi Maxwellian Average CS (MACS)
• R. Gallino
•S. Bisterzo
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Some preliminary astrophysical implications
238UT1/2=4.5x109y
N(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) = N(206Pb) - Ns(206Pb) - Nr(206Pb) = 0.105(15%)
N(238U) = 0.0187(8%) (Lodders 2003)
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Some preliminary astrophysical implications
N(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) = N(206Pb) - Ns(206Pb) - Nr(206Pb) = 0.105(15%)
N(238U) = 0.0187(8%) (Lodders 2003)
= 6.7(1.0) Gy
T= + 4.6 + 0.5 = 12(1) Gy
time duration of r-nucleosynthesis
decay rate of 238U
r supernova rate (-1.5 to -2x10-10 y)
1)exp()exp(
)exp(1
r
r
r
r
Fowler's exponential model
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The paper
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The problem of the angular distribution with C6D6
125o
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The problem of the angular distribution with C6D6
125o
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The problem of the angular distribution with C6D6
125o