ENTRY 40833 20231226 4083300000001 SUBENT 40833001 20231226 20240513 4083300100001 BIB 11 28 4083300100002 TITLE Np-237 neutron fission cross-section near the 4083300100003 threshold (n,n'f) 4083300100004 AUTHOR (A.A.Goverdovskiy,A.K.Gordyushin,B.D.Kuz'minov, 4083300100005 V.F.Mitrovanov,A.I.Sergachev,S.M.Solov'ev, 4083300100006 P.S.Soloshenkov) 4083300100007 REFERENCE (R,FEI-1552,1984) Data are given 4083300100008 INSTITUTE (4RUSFEI) 4083300100009 FACILITY (VDG) Electrostatic charge exchange accelerator EGP-10M4083300100010 INC-SOURCE (D-D) Gaseous deuterium target. 4083300100011 METHOD (TOF) Flight base 60 cm 4083300100012 DETECTOR (IOCH) Double ionization chamber. Filled with methane 4083300100013 at 1.8 atm pressure. Fission detection efficiency 4083300100014 96 % for Np, 98 % for U. 4083300100015 CORRECTION Background neutron scattering - 0.2 % 4083300100016 Fragments slowing-down in sample - 0.5 % 4083300100017 Admixture isotopes fission - 0.3 % 4083300100018 Geometrical factor - 0.1 % 4083300100019 ERR-ANALYS (ERR-T) Total uncertainty includes: 4083300100020 (ERR-S) Statistical uncertainty, 4083300100021 (ERR-1) Error caused by the absolute value calculation 4083300100022 (ERR-2) Error caused by the U-235 to NP-237 fission 4083300100023 fragments detection efficiencies 4083300100024 (ERR-3) Error due to the corrections introduced 4083300100025 HISTORY (19850218C) 4083300100026 (20231226A) ERR-S was deleted from COMMON block - it's 4083300100027 given in DATA block. 4083300100028 Upper -> lower case correction . 4083300100029 Dates were corrected for 4-digits year. 4083300100030 ENDBIB 28 0 4083300100031 COMMON 3 3 4083300100032 ERR-1 ERR-2 ERR-3 4083300100033 PER-CENT PER-CENT PER-CENT 4083300100034 2. 1.2 0.2 4083300100035 ENDCOMMON 3 0 4083300100036 ENDSUBENT 35 0 4083300199999 SUBENT 40833002 20231226 20240513 4083300200001 BIB 4 15 4083300200002 REACTION ((93-NP-237(N,F),,SIG)/(92-U-235(N,F),,SIG)) 4083300200003 SAMPLE Layers of 0.3 - 0.5 mg/cm2 thickness, 50 mm diameter, 4083300200004 on Al backings of 20 microm thickness. 4083300200005 First sample U-235 content is 99.992 % , density 4083300200006 0.258 milligram/cm2 4083300200007 Second sample U-235 content 5.889 % , Np-237 content 4083300200008 94.111 % , density 0.300 milligram/cm2 4083300200009 Third sample U-235 content is 99.994 % , density 4083300200010 0.41 milligram/cm2 4083300200011 Forth sample Np-237 content 99.05 % , Pu-239 content 4083300200012 0.43 % , Am-241 content 0.52 % , 4083300200013 density 0.46 milligram/cm2 4083300200014 MONITOR Absolute measurement 4083300200015 STATUS (TABLE,,A.A.Goverdovskiy+,R,FEI-1552,1984) 4083300200016 (PRELM) 4083300200017 ENDBIB 15 0 4083300200018 NOCOMMON 0 0 4083300200019 DATA 5 16 4083300200020 EN EN-RSL-FW DATA ERR-T ERR-S 4083300200021 MEV KEV NO-DIM PER-CENT PER-CENT 4083300200022 5.66 116. 1.315 3.38 0.7 4083300200023 5.88 108. 1.331 2.40 0.8 4083300200024 6.10 103. 1.395 2.45 1.0 4083300200025 6.32 97. 1.349 2.42 0.9 4083300200026 6.50 93. 1.330 2.42 0.9 4083300200027 6.68 89. 1.312 2.42 0.9 4083300200028 7.34 78. 1.232 1.75 0.6 4083300200029 7.96 70. 1.161 2.45 1.0 4083300200030 8.10 68. 1.151 2.45 1.0 4083300200031 8.39 65. 1.177 2.44 1.0 4083300200032 8.64 63. 1.157 2.46 0.8 4083300200033 8.78 62. 1.170 2.47 0.9 4083300200034 9.03 60. 1.150 2.45 1.0 4083300200035 9.17 59. 1.150 2.52 1.0 4083300200036 9.44 57. 1.135 2.50 1.1 4083300200037 10.06 53. 1.123 2.50 1.1 4083300200038 ENDDATA 18 0 4083300200039 ENDSUBENT 38 0 4083300299999 ENDENTRY 2 0 4083399999999