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