ENTRY 41476 20060929 41394147600000001 SUBENT 41476001 20060929 41394147600100001 BIB 16 42 4147600100002 TITLE .Measurements of Delayed Neutron Yields from Thermal 4147600100003 Neutron Induced Fission of Np-237 4147600100004 AUTHOR (N.A.GUNDORIN,K.V.ZHDANOVA,V.E.ZHUCHKO,L.B.PIKEL'NER, 4147600100005 N.V.REBROVA,I.M.SALAMATIN,V.I.SMIRNOV,V.I.FURMAN) 4147600100006 INSTITUTE (4ZZZDUB) 4147600100007 REFERENCE (R,JINR-P3-2005-171,,2005) Main Reference 4147600100008 REL-REF (N,,S.B.BORZAKOV+,J,AE,79,231,1995) Experiment.Details 4147600100009 Description of 'Isomer' Facility 4147600100010 FACILITY (REAC,4ZZZDUB) Fast Pulse Reactor IBR-2,11-B Channel 4147600100011 (CHOPS,4ZZZDUB) Bent Mirror Neutron Guide and Neutron 4147600100012 Chopper Syncronized with Reactor Neutron Bursts 4147600100013 ISOMER-M Facility. 4147600100014 INC-SOURCE (REAC) 5 Hz frequency, about 1300 MWt power. 4147600100015 INC-SPECT 6.E+5 neutrons/cm2/sec. 4147600100016 DETECTOR (D4PI) Relation of promt neutro registrario to 4147600100017 delayed neutron registration EPSp/EPSd=0.76 for 4147600100018 neutron detector. 4147600100019 (PROPC) 18 He-3 proportional counters SNM-33 of 32 mm 4147600100020 diameter and 52 cm lengh, under 2 atm presure, 4147600100021 1850 V voltage. 4147600100022 METHOD (TOF) 23 m Time-of-flight lenght. 4147600100023 SAMPLE U-235 8 mg on alumnium foil of 1 cm diameter. 4147600100024 Neptunium oxide Np-O2 of 23.05 g mass. 4147600100025 Admixtures of U-235 and Pu-239 in Np sample were less 4147600100026 1.E-6. 4147600100027 MONITOR ((92-U-235(N,F),PR,NU)/(92-U-235(N,F),DL,NU)) 4147600100028 ASSUMED (ASSUM1,92-U-235(N,F),PR,NU) 4147600100029 (ASSUM2,92-U-235(N,F),DL,NU) 4147600100030 (ASSUM3,93-NP-237(N,F),PR,NU) 4147600100031 Assumed values from: Landolt-Bornstein. Low Energy 4147600100032 Neutron Physics, Springer. V.16. 4147600100033 CORRECTION Corrections were made for: 4147600100034 U-235 and Pu-239 delayed neutrons contibution - 1-2%, 4147600100035 U-233 neutrons contribution - 4 %, 4147600100036 Neutrons scattering -2%, 4147600100037 Fast neutrons from O(n,a) reaction (62% for 1500-4096 4147600100038 spectrum channels), 4147600100039 Fast neutrons from reactor, 4147600100040 Outside neutron background. 4147600100041 ERR-ANALYS (ERR-T) Total Error including Statistical Error and 4147600100042 Error of normalization. 4147600100043 HISTORY (20060928C) Compiled at CJD. M.M. 4147600100044 ENDBIB 42 0 4147600100045 COMMON 6 3 4147600100046 EN-DUMMY ASSUM1 ASSUM1-ERR ASSUM2 ASSUM2-ERR ASSUM3 4147600100047 EV PRT/FIS PRT/FIS PRT/FIS PRT/FIS PRT/FIS 4147600100048 0.0253 2.432 0.004 0.0167 0.0007 2.52 4147600100049 ENDCOMMON 3 0 4147600100050 ENDSUBENT 49 0 4147600199999 SUBENT 41476002 20060929 41394147600200001 BIB 2 2 4147600200002 REACTION (93-NP-237(N,F),DL,NU) 4147600200003 STATUS From Text of Reference 4147600200004 ENDBIB 2 0 4147600200005 NOCOMMON 0 0 4147600200006 DATA 2 1 4147600200007 DATA ERR-T 4147600200008 PRT/FIS PRT/FIS 4147600200009 0.0115 0.0010 4147600200010 ENDDATA 3 0 4147600200011 ENDSUBENT 10 0 4147600299999 ENDENTRY 2 0 4147699999999