Integral Neutron Thermalization [qtrly prog rpt - ending Dec

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7 c o m p a r e s the e x p e r i m e n t a l double differential c r o s s s e c t i o n a t E = 0. 23 eV and 8 = 60° with the p r e 0 dicted values d e r i v e d f r o m s p e c t r a A and B (the calculation with s p e c 0 t r u m A was actually done f o r 8 = 55 ). 17 eV. This i s n e c e s s a r y b e c a u s e with l a r g e r energy exchanges the third line of s p e c t r u m A c a n be excited and t h e code only allows f o r two excited o s c i l l a t o r s . 09 eV line which is s m e a r e d out (for S p e c t r u m A ) by i n c r e a s i n g the number of lumped o s c i l l a t o r s t o four.

4. t I 0 UJ -co - hl-0-UJ . 0 0 co 0 0 0 . 0 0 0 00 0 i hl 3 0 a3 m N 0 W X e, > Ln W Ln N . 0 II 0 m N 0 " II cn - o c 0 + m~ 49 50 that the r e s u l t s given by GASKET using a frequency s p e c t r u m for beryllium, developed under this p r o j e c t , a g r e e f a i r l y well with the m e a s u r e m e n t s of S ( a , f3) by Schmunk. 2 ) REFERENCES 1. B u r k h a r t K . , and W . R e i c h a r d t , "Observation of Hardened Neutron S p e c t r a in Water and B o r i c Acid Solutions, I t P r o c e e d i n g s of the Brookhaven C o n f e r e n c e on Neutron T h e r m a l i z a t i o n , BNL-7 19, Vol.

0 e -- --- - e 0 \ 0 w rn \ 8 ---- SPECTRUM A SPECTRUM B ooooo EXPERIMENTAL - e SCATTERING BY POLYETHYLENE Eo = 0 . 25 0 Fig. 4 . 30 4 e 3 0 0 0 e 2 0 S C A T T E R I N G BY P O L Y E T H Y L E N E Eo = 0 . 25 S C A T T E R E D NEUTRON ENERGY ( e V ) 0 Fig. 4 . -- 3 0 n x m w e 37 9 a a 0 0 \o 0 m 0 0 3 0 3 T 3 3 \1 3 3 - ; 3 I I 4 0 4 M 2 in t h ( >original plot of r e f . 2 4). F i g u r e 4. ; s c a t t e r i n g angle of 60°. Mere, a s it i s always s e e n f o r l a r g e r scattcririg a n g l e s ( and thus l a r g e r CH r e c o i l s ) , the p r e d i c t e d peaks 2 a p p c a r somewhat shifted t o w a r d s lower final e n e r g i e s , It should be mentioned that in the two l a s t plots the 0.

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