Evolution from endf/b-vi release 8 to endf/b-vii_b1 to endf/b-vii_b2: --------------------------------------------------------------------- (6/1/2006) <-------------------C/E------------------> Assembly Experiment endf68 beta1 beta2 ---------------- ---------- ------------ ------------ --April06--- PMF001 (Jezebel) 1.0000(20) 0.99750(19) 1.00010(15) 0.99964(12) Pu/bare PMF006 (Flattop-Pu) 1.0000(30) 1.00269(18) 1.00196(22) 0.99992(22) Pu/uranium PMF008c (Thor) 1.0000(6) 1.00580(12) 0.99989(22) 0.99930(12) Pu/thorium PMF011 1.0000(10) 0.99715(23) 0.99907(19) 1.00059(19) Pu/water PMF022 1.0000(21) 0.99273(11) 0.99894(22) 0.99849(12) Pu/bare PMF020 0.9993(17) 0.99879(13) 0.99955(21) 0.99913(13) Pu/uranium PMF019 0.9992(15) 1.00209(13) 1.00318(13) 0.99875(13) Pu/Be PMF023 1.0000(16) 0.99768(13) 1.00037(16) 1.00013(12) Pu/graphite PMF024 1.0000(20) 0.99976(13) 1.00180(23) 1.00169(13) Pu/poly PMF035 1.0000(16) 1.00801(12) 1.00453(12) 0.99809(12) Pu/lead PMF009 1.0000(27) 1.00137(12) 1.00501(13) Pu/alum PMF025 1.0000(20) 0.99663(12) 0.99915(12) Pu/steel PMF026 1.0000(24) 0.99691(13) 0.99870(13) Pu/steel HMF001 (Godiva) 1.0000(10) 0.99664(19) 0.99989(15) 0.99998(13) HEU/bare HMF028 (Flattop-25) 1.0000(30) 1.00177(13) 1.00288(13) 1.00301(13) HEU/uranium HMF004 0.9985 0.99625(25) 1.00045(19) 1.00173(11) HEU/water HMF008 0.9989(16) 0.99345(12) 0.99582(12) 0.99722(12) HEU/bare HMF014 0.9989(17) 0.99598(12) 0.99763(12) 0.99881(12) HEU/uranium HMF011 0.9989(15) 0.99641(15) 1.00013(26) 1.00018(15) HEU/poly HMF012 0.9992(18) 0.99368(12) 0.99897(12) HEU/alum HMF013 0.9990(15) 0.99402(12) 0.99842(12) HEU/steel HMF027 1.0000(25) 1.00585(12) 1.00440(12) 1.00084(15) HEU/lead UMF001 (Jezebel-23) 1.0000(10) 0.99257(13) 0.99977(14) 0.99961(13) U233/bare UMF006 (Flattop-23) 1.0000(14) 1.00055(21) 0.99989(17) 0.99898(22) U233/uranium IMF007s (Bigten) 1.0045(7) 1.01167(24) 1.00068(16) 1.00020(13) uranium MCF001 (ZPR67) 0.9866(23) 1.00605(33) 1.00102(17) 1.00132(10) Pu/U LMFBR ICF001 (ZPR66A) 0.9939(23) 0.99921(26) 0.99828(15) 0.99906(10) U/U LMFBR HMF055 (ZPR3-23) 0.9977(3) 1.00104(12) U-Al/U HMI001 0.9966(26) 1.01179(14) U-Fe/steel Be Reflector Effect ------------------- Assembly Be cm endf68 beta2 -------- --------- ----------- ------------ MF58-5 2.223 0.99827(13) .99838(13) -4 3.264 0.99984(13) .99843(13) -3 5.436 1.00165(14) .99838(13) -2 9.271 1.00443(14) .99989(15) -1 20.269 1.00561(16) .99963(16) MMF7-6 1.36 .99751 .99966(13) -5 2.74 1.00123 1.00032(13) -4 5.60 1.00387 1.00210(14) -3 8.67 1.00587 1.00306(15) -2 16.20 1.00923 1.00514(16) -1 20.00 1.00554 1.00059(16) MMF7-13 1.77 .99805 1.00025(13) -12 1.77 1.00086 1.00115(13) -11 3.88 1.00179 1.00122(13) -10 6.10 1.00492 1.00189(14) -9 10.78 1.00566 1.00205(14) -8 13.17 1.00645 1.00180(15) -7 17.26 1.00867 1.00344(15)