l - th / 9 40 50 23 v 1 2 1 M ay 1 99 4 Comment on E 2 Contribution to the 8 B → p + 7 Be
نویسندگان
چکیده
The E2 cross section calculated by Langanke and Shoppa for the Riken experiment on the Coulomb Dissociation of B uses E2 nuclear matrix element from one sepcific model. Other nuclear models predict a consdiderably smaller E2 cross section (by approximately a factor of 3 to 4), and Langanke and Shoppa appear to assume the most optimistic scenario predicting a large E2 cross section. We also note that Barker has already criticised the nuclear model used by Langanke and Shoppa. A model independent Chi-Square analysis of the Riken data, suggest the best fit for the current Riken data is obtained with E1 amplitudes only. The upper limit (90% confidence) on the E2 component derived from our Chi-Square analysis is considerably smaller than used by Langanke and Shoppa. The model dependent analysis of Langanke-Shoppa should not be considered as a correction to the Riken result, as claimed, and their quoted S17(0) is not substantiated. PACS numbers: 25.20.+y, 25.70.+a, 27.20.+n, 96.20.Ka Typeset using REVTEX
منابع مشابه
FREZCHEM: A geochemical model for cold aqueous solutions
#,-(!!/%&%*0!1%&%)*23!4-&0#050%6!77.8!1)99#,!:)*;<)=6!1%-,6!>[email protected]!9#$%&(B)*#,-CD*#(%D5(!! ! ! Introduction: E1FGHIF'!#&!)-!%J5#$#K*#5B! 23%B#2)$!03%*B,D=-)B#2!B,D%$!L)*)B%0%*#M%D!N,*! 2,-2%-0*)0%D!%$%20*,$=0%!&,$50#,-&!O0,!#,-#2!&0*%-903&!P! 7Q!BR!5&#-9!03%!:#0M%*!)LL*,)23!S.+7T!N,*!03%!0%BL%*)+ 05*%!*)-9%!N*,B!UVWQ!0,!78XH6!)-D!03%!L*%&&5*%!*)-9%! N*,B!.!0,!.QQQ!K)*&!SYT(!!Z3%!25**%-0![%*&...
متن کاملToward a Theoretical Framework for Analysis and Synthesis of Agents that Learn from Distributed Dynamic Data Sources
! " # $ % & % ' ( ) * % ,+ $" . / 0 $ 1 $ $ ' $023% ( 4) 5 6 -% 7$ 28 &/ " ) $"4 5 9 5 , 123$ : " $ 28 ! 7 $" 4) ;3<= -& $ " >! &/ 23$" 4 ) "%/ + ?023$ @ $ <8 A * % $ B2C $ 4D49%! & E ! > % GF H ( 40 ) ( 9 $ % I8J1& $ &/$" ) 0 $" 5 2C 4) 4) ( : ) 7 % Q $" 4: I.J0 $ % R S2T 40 , HQ$ 2 5 .$"&/ $" '23$ & L ) &/ ,M/ $ 7$ 28 $"4) 9 U $ % $" V...
متن کاملar X iv : h ep - p h / 99 05 50 4 v 1 2 7 M ay 1 99 9 On the Long Distance Contribution to the B s → γγ Decay in the Effective Lagrangian Approach
We re-estimate the decay branching ratio of Bs → 2γ through D + s D − s and D∗+ s D ∗− s intermediate states, in the effective Lagrangian approach. We find that the branching ratio does not exceed a few times 10−7, contrary to the result recently claimed in the literature. PACS numbers: 13.25.Hw Typeset using REVTEX
متن کاملDECAF Programming: Agents for Undergraduates
! "# $ !%& ' ( ) +*, -. + /0 ) 132 4 2) 657 )-8 :9; <= # > 62 " 1?%@57 A% /0 )1? 7 !%CBED; # + 2) #2) F #2)1?"#% G # . H I # 4J1 /0 1K1? " L "# M4 %M ) ( #% # N2) O" # 2! P ? 2 1 L.QR #<= # S% ( + 5#"M +4 % 1$* L T: #%A M UV 2) ' !B WX $ ZY\[^]; `_aLb9; ' <0 % / 2 I c !%M"#2 # d # e1 / 1^ -F f 2 2)*S ! "# $ !%S9g + 2 2 b I% )/0 1 " + )-8" 1#9; <M h BiWj 57 )1? / " %M ) % " P 32! c ! + # 5#1$*65...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1994