ENTRY 20465 20220123 23092046500000001 SUBENT 20465001 20220123 23092046500100001 BIB 13 44 2046500100002 TITLE The neutron capture cross section of U-238 in the 2046500100003 energy region 0.5 to 100 keV 2046500100004 AUTHOR (M.C.Moxon) 2046500100005 REFERENCE ((R,AERE-R-6074,1969)= 2046500100006 (P,EANDC(UK)-113,1969)) Describes 2046500100007 a new experiment, the one which is here compiled. 2046500100008 The data published in this reference in table 8, 2046500100009 pag.14 have been however superseded by those listed 2046500100010 below which refer to the same experiment but were 2046500100011 normalized to new B-10(n,alpha) data. 2046500100012 (W,MOXON,197112) Revision of the data published in the 2046500100013 Harwell report mentioned below, attached to a Sowerby 2046500100014 letter to CCDN dated 7/12/1971. 2046500100015 Previous publications are 2046500100016 (T,MOXON,196807) M.C. Moxon thesis giving a full 2046500100017 description of the Harwell facilities. The measurement2046500100018 was performed on natural U sample and U-235 effects 2046500100019 were determined in a subsidiary experiment. 2046500100020 Data plot given. 2046500100021 (P,AERE-PR/NP-14,1968) Refers to the new experiment 2046500100022 (with U-238 sample). 2046500100023 (P,AERE-PR/NP-16,10,1969) Gives a short summary of 2046500100024 AERE-R-6074. 2046500100025 INSTITUTE (2UK HAR) 2046500100026 FACILITY (LINAC,2UK HAR) Harwell 45 MeV electron linear accel. 2046500100027 INC-SOURCE (PHOTO) Photo-neutron with booster. 2046500100028 SAMPLE U-sample, metallic disc, 0.001595 at/b, containing 2046500100029 U-238 (0.99965%) 2046500100030 U-235 (0.00035%) 2046500100031 Other (less than 0.00002%) 2046500100032 B-sample, metallic B powder with organic binder. 2046500100033 METHOD (TOF) Time-of-flight. Flight path= 32.5 m. 2046500100034 DETECTOR (MOXR) Moxon RaE detector. 2046500100035 MONITOR (5-B-10(N,A)3-LI-7,,SIG) 2046500100036 MONIT-REF (,M.G.Sowerby+,J,NE,24,323,1970) 2046500100037 ERR-ANALYS (ERR-T) Total ucertainty 2046500100038 (ERR-1,2.,4.7) Uncertainty due to background 2046500100039 (ERR-2) Uncertainty in normalisation 2046500100040 (ERR-3) Uncertainty in boron yield calculation 2046500100041 (ERR-S,,1.) Statistical uncertainty 2046500100042 HISTORY (19720104C) 2046500100043 (20060418A) Corrected SM after M.Moxon comment 2046500100044 (20060512U) Last corrections have been done. 2046500100045 (20220123U) SD: Ref. updated. ERR-ANALYS updated. 2046500100046 ENDBIB 44 0 2046500100047 COMMON 2 3 2046500100048 ERR-2 ERR-3 2046500100049 PER-CENT PER-CENT 2046500100050 1.25 1.5 2046500100051 ENDCOMMON 3 0 2046500100052 ENDSUBENT 51 0 2046500199999 SUBENT 20465002 20220123 23092046500200001 BIB 4 16 2046500200002 REACTION (92-U-238(N,G)92-U-239,,SIG,,AV) Averaged over 2046500200003 energy interval 2046500200004 COMMENT The new values have been modified for (1) improved 2046500200005 self screening and multiple scattering corrections 2046500200006 and (2) the energy dependence of B-10(n,alpha+gamma) 2046500200007 cross-section has been modified to that recommended 2046500200008 by Sowerby (see MONIT-REF). 2046500200009 Most of the errors are predominately systematic in 2046500200010 origin as discussed in AERE-R-6074. The errors 2046500200011 quoted have been increased slightly from those given 2046500200012 in AERE-R-6074 to allow for uncertainties in the 2046500200013 self screening and multiple scattering corrections. 2046500200014 STATUS (TABLE) Data from Sowerby, letter, 07/12/1971. 2046500200015 (SPSDD,20465003) 2046500200016 HISTORY (20060418U) Superseded, SM 2046500200017 (20220123A) SD: DATA-ERR -> ERR-T. 2046500200018 ENDBIB 16 0 2046500200019 NOCOMMON 0 0 2046500200020 DATA 4 18 2046500200021 EN-MIN EN-MAX DATA ERR-T 2046500200022 MEV MEV B PER-CENT 2046500200023 1.E-03 2.E-03 1.974 4.8 2046500200024 2.E-03 3.E-03 1.48 4.9 2046500200025 3.E-03 4.E-03 1.232 5.2 2046500200026 4.E-03 5.E-03 9.635E-01 5.7 2046500200027 5.E-03 6.E-03 9.395E-01 6.4 2046500200028 6.E-03 7.E-03 8.243E-01 6.1 2046500200029 7.E-03 8.E-03 7.933E-01 6.2 2046500200030 8.E-03 9.E-03 7.232E-01 6.5 2046500200031 9.E-03 1.E-02 7.225E-01 6.2 2046500200032 1.E-02 2.E-02 6.119E-01 6. 2046500200033 2.E-02 3.E-02 4.623E-01 6.2 2046500200034 3.E-02 4.E-02 3.867E-01 8.8 2046500200035 4.E-02 5.E-02 3.486E-01 6.3 2046500200036 5.E-02 6.E-02 3.005E-01 6. 2046500200037 6.E-02 7.E-02 2.564E-01 6. 2046500200038 7.E-02 8.E-02 2.154E-01 6.3 2046500200039 8.E-02 9.E-02 1.853E-01 8.4 2046500200040 9.E-02 1.E-01 1.833E-01 8.3 2046500200041 ENDDATA 20 0 2046500200042 ENDSUBENT 41 0 2046500299999 SUBENT 20465003 20220123 23092046500300001 BIB 4 6 2046500300002 REACTION (92-U-238(N,G)92-U-239,,SIG,,AV) 2046500300003 CORRECTION Corrected for scattered neutron detections, 2046500300004 self screening and impurities 2046500300005 STATUS (TABLE) Data from M.C.Moxon, 2006-04 2046500300006 HISTORY (20060512C) SM 2046500300007 (20220123U) SD: Cosmetic corrections. 2046500300008 ENDBIB 6 0 2046500300009 NOCOMMON 0 0 2046500300010 DATA 4 19 2046500300011 EN-MIN EN-MAX DATA ERR-T 2046500300012 KEV KEV B B 2046500300013 1. 2. 1.9875 0.095 2046500300014 2. 3. 1.4919 0.073 2046500300015 3. 4. 1.2206 0.065 2046500300016 4. 5. 0.9712 0.055 2046500300017 5. 6. 0.9487 0.061 2046500300018 6. 7. 0.8335 0.051 2046500300019 7. 8. 0.8042 0.05 2046500300020 8. 9. 0.7285 0.047 2046500300021 9. 10. 0.7301 0.045 2046500300022 10. 20. 0.6167 0.037 2046500300023 20. 30. 0.4633 0.029 2046500300024 30. 40. 0.4037 0.036 2046500300025 40. 50. 0.3477 0.022 2046500300026 50. 60. 0.305 0.018 2046500300027 60. 70. 0.2568 0.015 2046500300028 70. 80. 0.2133 0.013 2046500300029 80. 90. 0.1892 0.016 2046500300030 90. 100. 0.1892 0.016 2046500300031 100. 200. 0.1877 0.024 2046500300032 ENDDATA 21 0 2046500300033 ENDSUBENT 32 0 2046500399999 ENDENTRY 3 0 2046599999999