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Documentation on the ENDF66 Libraries

Released: 1999-07-22

ENDF66 is a continuous-energy neutron data library for use with MCNP® versions 4C and later. The library contains data processed from ENDF/B-VI (Release 6) evaluated data using the NJOY99 code, and includes data for

  • delayed-neutron spectra,
  • unresolved-resonance probability tables,
  • detailed charged-particle production,
  • and tabular angular distributions.

The ENDF66 library contains data for 173 nuclides in five separate data files.

  • ENDF66A, ENDF66B, and ENDF66C contain data for all nuclides at room-temperature,
  • ENDF66D contains data for a subset of nuclides at 77K,
  • ENDF66E contains data for subset of nuclides at 3000K.

The ENDF66 library succeeds the ENDF60 library (based on ENDF/B-VI, Release 2), the URESA library (based on ENDF/B-VI, Release 4, and including unresolved-resonance probability tables), and the ENDF6DN library (ENDF60 data with delayed-neutron data appended). Since the last comprehensive MCNP® library, ENDF60, was released by LANL in June 1993, several important new evaluations have been performed and the MCNP® data library format has been expanded allowing for new data, including delayed-neutron spectra, unresolved-resonance probability tables, detailed charged-particle production, and tabular angular distributions. Relative to the ENDF60 library, the new ENDF66 library has added 58 new nuclides and data for 40 nuclides are based on new evaluations. In particular, evaluations for uranium, plutonium, tungsten, and iron isotopes have been updated. Additionally, some changes from ENDF60 have been made in NJOY processing, including the use of smaller resonance reconstruction tolerances and decreased thinning of energy points.

NuclideZAID
h1x1001.66c
h2f1002.66c
h31003.66c
he3a2003.66c
he4x2004.66c
li6a3006.66c
li73007.66c
be94009.66c
b10a5010.66c
b11x5011.66c
cnatf6000.66c
n14f7014.66c
n157015.66c
o16f8016.66c
o178017.66c
f19x9019.66c
na23a11023.66c
mgnat12000.66c
al27f13027.66c
si28f14028.66c
si29f14029.66c
si30f14030.66c
p31f15031.66c
snat16000.66c
s3216032.66c
clnat17000.66c
knat19000.66c
canatf20000.66c
sc45x21045.66c
tinat22000.66c
vnat23000.66c
cr50f24050.66c
cr52f24052.66c
cr53f24053.66c
cr54f24054.66c
mn55e25055.66c
fe54f26054.66c
fe56f26056.66c
fe57f26057.66c
fe58e26058.66c
co59b27059.66c
ni58f28058.66c
ni60f28060.66c
ni61f28061.66c
ni62f28062.66c
ni64f28064.66c
cu63f29063.66c
cu65f29065.66c
ganat31000.66c
kr7836078.66c
kr8036080.66c
kr8236082.66c
kr8336083.66c
kr8436084.66c
kr8636086.66c
rb8537085.66c
rb8737087.66c
y89d39089.66c
zrnata40000.66c
zr90x40090.66c
zr91x40091.66c
zr92x40092.66c
zr94x40094.66c
zr96x40096.66c
nb93f41093.66c
monat42000.66c
tc9943099.66c
rh10345103.66c
pd102e46102.66c
pd104e46104.66c
pd105e46105.66c
pd106e46106.66c
pd108e46108.66c
pd110e46110.66c
ag10747107.66c
ag10947109.66c
cd106d48106.66c
cd108d48108.66c
cd110x48110.66c
cd111c48111.66c
cd112d48112.66c
cd113c48113.66c
cd114d48114.66c
cd116d48116.66c
innat49000.66c
i127b53127.66c
xe12454124.66c
xe12654126.66c
xe12854128.66c
xe12954129.66c
xe13054130.66c
xe13154131.66c
xe13254132.66c
xe13454134.66c
xe13654136.66c
cs13355133.66c
ba138c56138.66c
sm14762147.66c
sm14962149.66c
eu15163151.66c
eu15263152.66c
eu15363153.66c
eu15463154.66c
eu155a63155.66c
gd152d64152.66c
gd154d64154.66c
gd15564155.66c
gd15664156.66c
gd15764157.66c
gd15864158.66c
gd16064160.66c
ho165e67165.66c
lu17571175.66c
lu17671176.66c
hf174b72174.66c
hf176b72176.66c
hf177b72177.66c
hf178b72178.66c
hf179b72179.66c
hf180b72180.66c
ta18173181.66c
ta18273182.66c
w182f74182.66c
w183f74183.66c
w184f74184.66c
w186f74186.66c
re18575185.66c
re18775187.66c
ir191x77191.66c
ir193x77193.66c
au197a79197.66c
pb206f82206.66c
pb207f82207.66c
pb208x82208.66c
bi209c83209.66c
th23090230.66c
th23290232.66c
pa23191231.66c
pa23391233.66c
u23292232.66c
u23392233.66c
u23492234.66c
u235e92235.66c
u23692236.66c
u237b92237.66c
u238e92238.66c
np237a93237.66c
np23993239.66c
pu236d94236.66c
pu23794237.66c
pu23894238.66c
pu239e94239.66c
pu240b94240.66c
pu241c94241.66c
pu24294242.66c
pu243b94243.66c
pu24494244.66c
am241x95241.66c
am242ma95242.66c
am243e95243.66c
cm24196241.66c
cm24296242.66c
cm24396243.66c
cm24496244.66c
cm245b96245.66c
cm246b96246.66c
cm247b96247.66c
cm24896248.66c
bk24997249.66c
cf249x98249.66c
cf250b98250.66c
cf251b98251.66c
cf252b98252.66c

Documentation

  1. "ENDF66: A CONTINUOUS-ENERGY NEUTRON DATA LIBRARY FOR MCNP4C," Campbell, J.M., Frankle, S.C., Little, R.C., LA-UR-02-3000
  2. "Comparison of Criticality Results for the ENDF60 and ENDF66 Libraries," Frankle, S.C., Campbell, J.M., Little, R.C., LA-UR-03-953
  3. "ENDF66: A Continuous-Energy Neutron Data Library Bsaed on ENDF/B-VI Release 6," Campbell, J.M., Frankle, S.C., Little, R.C., LA-UR-03-0954

Downloads

ENDF66 can be downloaded either as a zip file or as a compressed tarball

  • endf66.zip (sha512 5a00665d249d4377e1fd6318e7ae4c51fd04cf2331d6e4fe6485375a70ef446023250fe1a21fb016eda3cbe61981433e887db6682de932a90356c1ac49380cd5)
  • endf66.tgz (sha512 8261b89d2387be0357140a11f06942a24d9196e590852bc1faf9325b742cbdbeafbabe18537fe9b27bed15fdf09fc1bd13888139d941793dbc0fd56b52b41e10)

If further information is required contact a member of the Data Team by e-mail at nucldata@lanl.gov