ENTRY 40701 20210312 41954070100000001 SUBENT 40701001 20210312 41954070100100001 BIB 17 76 4070100100002 TITLE Measurement of the cross sections of the reaction 4070100100003 237Np(n,2n)236Np (22.5 h) for neutron energies in the 4070100100004 range 7-10 MeV 4070100100005 AUTHOR (N.V.Kornilov,V.Ya.Baryba,A.V.Balitskii,A.P.Rudenko, 4070100100006 B.D.Kuz'minov,O.A.Sal'nikov, 4070100100007 E.A.Gromova,S.S.Kovalenko,L.D.Preobrazhenskaya, 4070100100008 A.V.Stepanov,Yu.A.Nemilov,Yu.A.Selitskii,B.I.Tarler, 4070100100009 V.B.Funshtein,V.A.Yakovlev, 4070100100010 Sh.Darotsi,P.Raich,I.Chikai) 4070100100011 Sh.Darotsi = S.Daroczy; P.Raich = P.Raics, 4070100100012 I.Chikai = J.Csikai 4070100100013 INSTITUTE (4RUSFEI) First six authors 4070100100014 (4RUSRI) Nine following authors 4070100100015 (3HUNKOS) Three last authors 4070100100016 REFERENCE (J,AE,58,117,1985) Issue 2. 4070100100017 (J,SJA,58,131,1985) 4070100100018 #doi:10.1007/BF01122203 4070100100019 Engl.transl.of At.Energy,v.58,is.2,p.117,1985 4070100100020 (S,IAEA-TECDOC-336,305,1985) in English 4070100100021 REL-REF (M,30561001,N.V.Kornilov+,J,AE,49,283,1980) Issue 5. 4070100100022 Kornilov et.al, experimental details. U8(n,2n). 4070100100023 (M,30561001,N.V.Kornilov+,J,SJA,49,722,1980) 4070100100024 Engl.translation of At.Energy,v.49,is.5,p.283,1980. 4070100100025 FACILITY (VDGT,4RUSFEI) Charge exchange accelerator EGM-10M. 4070100100026 INC-SOURCE (D-D) 4070100100027 MONITOR Three monitors for neutron flux. 4070100100028 1(13-AL-27(N,A)11-NA-24,,SIG) 4070100100029 2(92-U-238(N,F),,SIG) 4070100100030 3(92-U-238(N,2N)92-U-237,,SIG) 4070100100031 MONIT-REF 1(,B.Magurno,R,IAEA-208,375,1978) 4070100100032 ENDF/B-V dosim.file 4070100100033 2(,N.V.Kornilov,J,YK,,(1/45),33,1982) 4070100100034 3(,B.Magurno,R,IAEA-208,375,1978) 4070100100035 ENDF/B-V dosim.file 4070100100036 DETECTOR (GELI) For gamma detection 4070100100037 (SCIN) Scintillation layer counter for beta detection 4070100100038 PART-DET (DG) Decay gamma of 237U and 24Na 4070100100039 (B-) Beta-minus of 24Na 4070100100040 SAMPLE Np-oxide placed in thin-walled containers of 10 mm 4070100100041 diameter, 2-3 mm height. Samples weight 140-400 mg. 4070100100042 Np was prepurified from Pu isotopes by a factor of 4070100100043 about 10**5. Background of Pu-236 was within 0.1% of 4070100100044 the induced one. 4070100100045 METHOD (ACTIV,CHSEP) Each sample was irradiated for 80-100 hr.4070100100046 Np-236 decays to Pu-236 by beta(-) emission. 4070100100047 Cross section for Np-237(n,2n)Np-236 reaction was 4070100100048 measured by detection of alpha particle emission 4070100100049 from Pu-236. 4070100100050 After irradiation,Pu-236 was radiochemically separated.4070100100051 For this purpose, Pu-239 was used as tracer and 4070100100052 the cross section was calculated by formula 4070100100053 sigma(n,2n)=A*(n(Pu-236)/n(Pu-239))*(1/(N*f*l*W)) 4070100100054 where 4070100100055 A- Pu-239 activity 4070100100056 n(Pu-236)/n(Pu-239) - ratio of alpha intensities from 4070100100057 Pu-236 and Pu-239 4070100100058 N- number of Np-237 nuclei in the sample 4070100100059 f- neutron flux 4070100100060 l- decay constant for Pu-236 4070100100061 W- beta(-) decay probability for Np-236 = 0.48+-0.01 4070100100062 CORRECTION Correction on neutron flux fluctuations < 10% . 4070100100063 ERR-ANALYS (ERR-T) uncertainty includes: 4070100100064 (ERR-1,,4.) Flux determination 4070100100065 (ERR-2) Uncertainty in the number of Np-237 nuclei 4070100100066 (ERR-3) Uncertainty of Pu-239 activity 4070100100067 (ERR-4,,3.) Uncertainty in the ratio of alpha-particles4070100100068 from Pu-236 and Pu-239 4070100100069 (ERR-5) Error of beta(-) branching ratio 4070100100070 STATUS (APRVD) N.Kornilov, 1984-07-12 4070100100071 Entry 40701 supersedes 30817 . 4070100100072 HISTORY (19840713C) Compiled at CJD . 4070100100073 (20140725S) Entry was restored. 4070100100074 Upper -> lower case correction. 4070100100075 Dates were corrected for 4-digits year. 4070100100076 BIB information was updated. 4070100100077 (20210312U) Subent 002 was corrected. 4070100100078 ENDBIB 76 0 4070100100079 COMMON 3 3 4070100100080 ERR-2 ERR-3 ERR-5 4070100100081 PER-CENT PER-CENT PER-CENT 4070100100082 0.8 1.0 2.0 4070100100083 ENDCOMMON 3 0 4070100100084 ENDSUBENT 83 0 4070100199999 SUBENT 40701002 20210312 41954070100200001 BIB 5 5 4070100200002 REACTION (93-NP-237(N,2N)93-NP-236-M,,SIG) 4070100200003 DECAY-DATA (93-NP-236-M,22.5HR,B-,,0.48) 4070100200004 RAD-DET (94-PU-236,A) 4070100200005 STATUS (TABLE) At.Energy,v.58,is.2,p.117,1985 4070100200006 HISTORY (20210212U) Comma was added in DECAY-DATA 4070100200007 ENDBIB 5 0 4070100200008 COMMON 1 3 4070100200009 ERR-HL 4070100200010 HR 4070100200011 0.4 4070100200012 ENDCOMMON 3 0 4070100200013 DATA 5 7 4070100200014 EN EN-ERR EN-RSL-FW DATA ERR-T 4070100200015 MEV MEV MEV MB MB 4070100200016 7.09 .10 .46 49. 3. 4070100200017 7.47 .10 .50 86. 4. 4070100200018 7.90 .09 .47 123. 7. 4070100200019 8.32 .11 .55 191. 9. 4070100200020 8.90 .11 .56 256. 13. 4070100200021 9.37 .12 .56 338. 13. 4070100200022 9.90 .10 .62 335. 13. 4070100200023 ENDDATA 9 0 4070100200024 ENDSUBENT 23 0 4070100299999 ENDENTRY 2 0 4070199999999