ENTRY 30283 20081203 31323028300000001
SUBENT 30283001 20081203 31323028300100001
BIB 13 40 3028300100002
INSTITUTE (3ARGCAB) 3028300100003
REFERENCE (W,KROPFF MORENO,19740327) Experimental details 3028300100004
AUTHOR (F.Kropff,J.R.Latorre,J.R.Granada,C.Castro MAdero) 3028300100005
TITLE Total neutron cross-section of D2O at 20 degrees-C 3028300100006
between 0.0005 and 10 eV. 3028300100007
EXP-YEAR (1973) 3028300100008
FACILITY (LINAC) Pulsed 25 MeV Linac. 3028300100009
The electron target was a lead cylinder (d=5 cm, 3028300100010
h=5 cm) located inside the moderator which was a 3028300100011
paraffin cylinder (d=19 cm, h=19 cm). The bottom of a 3028300100012
hole (d=8 cm, h=9 cm) cut into the paraffin, acted as 3028300100013
neutron source. This assembly was cooled with liquid 3028300100014
nitrogen in order to increase the number of low energy 3028300100015
neutrons. 3028300100016
SAMPLE The sample containers were cylinders with glass walls 3028300100017
allowing D2O thicknesses of 1.0, 1.4 and 1.8 cm at 3028300100018
0.1% of accuracy. 3028300100019
METHOD (TOF) Transmission method with pulsed neutron time-of- 3028300100020
flight technique. The sample changer was placed 8.40 m 3028300100021
from the neutron source and had the following positions3028300100022
1. D2O sample. 3028300100023
2. Air filled container identical with that of the 3028300100024
sample. 3028300100025
3. A filter opaque to thermal neutrons (a 7 cm thick 3028300100026
block of paraffin) + an air filled container as 3028300100027
above. 3028300100028
4. A filter opaque to thermal neutrons and source 3028300100029
gamma rays comprised of item 3 above plus a 10 cm 3028300100030
thick lead brick. 3028300100031
Each run consisted of 12 cycles of the sample changer 3028300100032
and 20 runs were performed with each of the 3 samples. 3028300100033
DETECTOR (GLASD) 12.5 cm in diameter by 1.27 cm thick Li-6 glass3028300100034
scintillator coupled to an EMI-9618R photomultiplier. 3028300100035
MONITOR Transmission measurements. 3028300100036
PART-DET (N) neutrons. 3028300100037
STATUS (APRVD) Approved by Kropff Moreno (19750414) 3028300100038
HISTORY (19741209C) CA. 3028300100039
(19750502A) CA. -Status 'Aprvd' + numerical values of3028300100040
data errors added. 3028300100041
(20080423A) BIB section updated 3028300100042
ENDBIB 40 0 3028300100043
NOCOMMON 0 0 3028300100044
ENDSUBENT 43 0 3028300199999
SUBENT 30283002 20081203 31323028300200001
BIB 3 25 3028300200002
REACTION (1-H-D2O(N,TOT),,SIG) 3028300200003
CORRECTION Raw data were corrected for deadtime, mean emission 3028300200004
time and background. Inscattering and multiple scatte- 3028300200005
ring corrections were found negligible. 3028300200006
The 20 total cross-sections curves were averaged as 3028300200007
follows= 3028300200008
1. Region below 10**-2 eV: weights 3, 2 and 1 were 3028300200009
respectively attributed to the 1 cm, 1.4 cm and 3028300200010
1.8 cm samples. 3028300200011
2. Region above 1 eV: weights 3, 2 and 1 were respec-3028300200012
tively attributed to the 1.8 cm, 1.4cm and 1 cm 3028300200013
samples. 3028300200014
3. Region between 10**-2 and 1eV: equal weights for 3028300200015
the 3 samples. 3028300200016
Correction was also performed for H-O-D (0.41%) 3028300200017
contamination. 3028300200018
ERR-ANALYS (DATA-ERR) Data errors include statistical +systemati- 3028300200019
cal errors which consist of the 3028300200020
.Error due to temperature variations (upper limit was 3028300200021
estimated to 0.2% at 10**-3 eV by using the 3028300200022
value of the total cross section at 9 degrees-C by 3028300200023
Whittemore,60Wien,511(1960). 3028300200024
.Error due to the sample thickness (0.1%). 3028300200025
.Errors arising from the non-uniformity of the 3028300200026
containers glass walls (0.2%). 3028300200027
ENDBIB 25 0 3028300200028
COMMON 1 3 3028300200029
TEMP 3028300200030
DEG-C 3028300200031
2.0000E+01 3028300200032
ENDCOMMON 3 0 3028300200033
DATA 3 80 3028300200034
EN DATA DATA-ERR 3028300200035
EV B PER-CENT 3028300200036
5.0120E-04 2.0600E+01 6.8000E+00 3028300200037
6.3100E-04 1.9780E+01 4.8000E+00 3028300200038
7.9430E-04 1.8440E+01 3.8000E+00 3028300200039
1.0000E-03 1.8250E+01 2.7000E+00 3028300200040
1.2590E-03 1.8690E+01 3.1000E+00 3028300200041
1.4130E-03 1.9430E+01 2.1000E+00 3028300200042
1.5850E-03 1.9790E+01 2.2000E+00 3028300200043
1.7780E-03 2.0990E+01 1.8000E+00 3028300200044
1.9950E-03 2.2410E+01 1.7000E+00 3028300200045
2.2390E-03 2.2300E+01 1.7000E+00 3028300200046
2.5120E-03 2.3230E+01 1.7000E+00 3028300200047
2.8180E-03 2.3320E+01 1.6000E+00 3028300200048
3.1620E-03 2.3000E+01 1.6000E+00 3028300200049
3.5480E-03 2.2520E+01 1.5000E+00 3028300200050
3.9810E-03 2.2080E+01 1.5000E+00 3028300200051
4.4670E-03 2.1810E+01 1.5000E+00 3028300200052
5.0120E-03 2.1110E+01 1.5000E+00 3028300200053
5.6230E-03 2.0290E+01 1.5000E+00 3028300200054
6.3100E-03 1.9880E+01 1.5000E+00 3028300200055
7.0790E-03 1.9460E+01 1.5000E+00 3028300200056
7.9430E-03 1.8850E+01 1.5000E+00 3028300200057
8.9130E-03 1.8430E+01 1.5000E+00 3028300200058
1.0000E-02 1.7970E+01 1.5000E+00 3028300200059
1.1220E-02 1.7230E+01 1.5000E+00 3028300200060
1.2590E-02 1.6620E+01 1.5000E+00 3028300200061
1.4130E-02 1.6060E+01 1.5000E+00 3028300200062
1.5850E-02 1.5600E+01 1.5000E+00 3028300200063
1.7780E-02 1.5350E+01 1.5000E+00 3028300200064
1.9950E-02 1.4930E+01 1.5000E+00 3028300200065
2.2390E-02 1.4600E+01 1.5000E+00 3028300200066
2.5120E-02 1.4380E+01 1.5000E+00 3028300200067
2.8180E-02 1.4270E+01 1.5000E+00 3028300200068
3.1620E-02 1.4110E+01 1.5000E+00 3028300200069
3.5480E-02 1.4050E+01 1.5000E+00 3028300200070
3.9810E-02 1.3920E+01 1.5000E+00 3028300200071
4.4670E-02 1.3730E+01 1.5000E+00 3028300200072
5.0120E-02 1.3710E+01 1.5000E+00 3028300200073
5.6230E-02 1.3460E+01 1.5000E+00 3028300200074
6.3100E-02 1.3130E+01 1.5000E+00 3028300200075
7.0790E-02 1.2900E+01 1.5000E+00 3028300200076
7.9430E-02 1.2820E+01 1.5000E+00 3028300200077
8.9130E-02 1.2590E+01 1.5000E+00 3028300200078
1.0000E-01 1.2320E+01 1.5000E+00 3028300200079
1.1220E-01 1.2450E+01 1.5000E+00 3028300200080
1.2590E-01 1.2270E+01 1.5000E+00 3028300200081
1.4130E-01 1.1970E+01 1.5000E+00 3028300200082
1.5850E-01 1.1770E+01 1.5000E+00 3028300200083
1.7780E-01 1.1630E+01 1.5000E+00 3028300200084
1.9950E-01 1.1640E+01 1.5000E+00 3028300200085
2.2390E-01 1.1500E+01 1.5000E+00 3028300200086
2.5120E-01 1.1390E+01 1.5000E+00 3028300200087
2.8180E-01 1.0980E+01 1.5000E+00 3028300200088
3.1620E-01 1.0900E+01 1.5000E+00 3028300200089
3.5480E-01 1.0860E+01 1.5000E+00 3028300200090
3.9810E-01 1.0760E+01 1.5000E+00 3028300200091
4.4670E-01 1.0840E+01 1.5000E+00 3028300200092
5.0120E-01 1.0690E+01 1.5000E+00 3028300200093
5.6230E-01 1.0780E+01 1.5000E+00 3028300200094
6.3100E-01 1.0700E+01 1.5000E+00 3028300200095
7.0790E-01 1.0610E+01 1.5000E+00 3028300200096
7.9430E-01 1.0640E+01 1.5000E+00 3028300200097
8.9130E-01 1.0650E+01 1.5000E+00 3028300200098
1.0000E+00 1.0500E+01 1.5000E+00 3028300200099
1.1220E+00 1.0660E+01 1.5000E+00 3028300200100
1.2590E+00 1.0600E+01 1.5000E+00 3028300200101
1.4130E+00 1.0550E+01 1.5000E+00 3028300200102
1.5850E+00 1.0570E+01 1.5000E+00 3028300200103
1.7780E+00 1.0580E+01 1.5000E+00 3028300200104
1.9950E+00 1.0560E+01 1.5000E+00 3028300200105
2.2390E+00 1.0530E+01 1.5000E+00 3028300200106
2.5120E+00 1.0510E+01 1.5000E+00 3028300200107
2.8180E+00 1.0580E+01 1.5000E+00 3028300200108
3.1620E+00 1.0550E+01 1.5000E+00 3028300200109
3.5480E+00 1.0520E+01 1.5000E+00 3028300200110
3.9810E+00 1.0420E+01 1.5000E+00 3028300200111
5.0120E+00 1.0510E+01 1.5000E+00 3028300200112
6.3100E+00 1.0500E+01 2.2000E+00 3028300200113
7.9430E+00 1.0570E+01 2.0000E+00 3028300200114
1.0000E+01 1.0360E+01 3028300200115
1.2590E+01 1.0400E+01 3028300200116
ENDDATA 82 0 3028300200117
ENDSUBENT 116 0 3028300299999
ENDENTRY 2 0 3028399999999