ENTRY 20127 20190117 22742012700000001 SUBENT 20127001 20190117 22742012700100001 BIB 14 33 2012700100002 TITLE Variation of the binary-to-ternary fission ratio for 2012700100003 U-235 in the resonance region 2012700100004 AUTHOR (A.J.Deruytter, C.Wagemans) 2012700100005 REFERENCE (C,69VIENNA,,898,1969) Abstract, data. 2012700100006 (R,EANDC(E)-123,1970) Internal report recorded by 2012700100007 priv. communication Deruytter Jan. 1971. 2012700100008 exp.descr., data. 2012700100009 INSTITUTE (2ZZZGEL) 2012700100010 FACILITY (LINAC,2ZZZGEL) Electron linear accelerator of CBNM. 2012700100011 INC-SOURCE Photo neutrons from natural uranium target 2012700100012 moderated by a polyethylene sheet. 2012700100013 SAMPLE Two deposits of 2 milli-g/cm2 back-to-back 2012700100014 of 99.5% enriched U-235. 2012700100015 METHOD (TOF) Time of flight,flight path = 8 m. 2012700100016 DETECTOR (SIBAR) Large gold-silicon surface barrier detectors 2012700100017 (four 6 cm2 detectors), on both sides of the back-to- 2012700100018 back target. 2012700100019 Detection of long range alpha (absorber in) and of 2012700100020 fission fragments (absorber out). The absorber is 2012700100021 20 micron thick aluminium. 2012700100022 MONITOR Ternary to binary fission ratios were normalized 2012700100023 to the value at the 8.78 eV resonance. 2012700100024 COMMENT The lower detection level for ternary alpha particles 2012700100025 was about 10 MeV. As a change in the ratios may be 2012700100026 expected depending on the ternary-alpha detection 2012700100027 level, a measurement with a level of about 15 MeV has 2012700100028 now been done (see status). 2012700100029 ERR-ANALYS (DATA-ERR) No details given. 2012700100030 STATUS (TABLE) private communication; rept. EANDC(E)-123. 2012700100031 HISTORY (19720828C) 2012700100032 (20190117A) SD:Updated to new date formats,lower case. 2012700100033 REACTION code in Subent 002 corrected according to 2012700100034 MEMO CP-D/969. Prog. reports deleted from refs(no data)2012700100035 ENDBIB 33 0 2012700100036 NOCOMMON 0 0 2012700100037 ENDSUBENT 36 0 2012700199999 SUBENT 20127002 20190117 22742012700200001 BIB 5 25 2012700200002 REACTION (92-U-235(N,F)2-HE-4,TER,FY,,RES/REL) 2012700200003 ratios ternary/binary fission at resonance energy, 2012700200004 normalized to the value for the 8.78 eV resonance. 2012700200005 PART-DET (FF,A) Fission fragments, alpha's. 2012700200006 COMMENT Average of two runs with different detector geometries2012700200007 which agree within experimental errors. 2012700200008 Two groups of resonances energies, 8.78 and 12.3 eV 2012700200009 with low ter/bin ratio and 19.3 and 22.1 eV with 2012700200010 about 15% higher ter/bin ratio. 2012700200011 Correlation with other measurements show, 2012700200012 agreement with scattering experiments (spin values) 2012700200013 and fission fragment anisotropy, 2012700200014 disagreement with gamma-ray multiplicity experiments 2012700200015 (spin values) and 2012700200016 no contradiction with experiments on kinetic energy 2012700200017 and mass symmetry of fission fragments. 2012700200018 Earlier measurements of the ratio did not 2012700200019 significantly show this effect probably due to a too 2012700200020 low ternary-alpha detection level. 2012700200021 STATUS (TABLE) Data from EANDC(E)-123; same in 69VIENNA,,898 2012700200022 (SPSDD,20381002) Superseded by Nucl.Phys.,A194(1972)6572012700200023 HISTORY (19720828C) 2012700200024 (20190117S) SD: Data were restored from archive. 2012700200025 SF4=He-4 added; SF5=TER/BIN -> TER; SF6=SIG/RAT -> FY; 2012700200026 SF8=RES -> RES/REL in REACTION code. 2012700200027 ENDBIB 25 0 2012700200028 NOCOMMON 0 0 2012700200029 DATA 3 4 2012700200030 EN-RES DATA DATA-ERR 2012700200031 MEV ARB-UNITS ARB-UNITS 2012700200032 8.780E-06 100. 2.5 2012700200033 1.239E-05 102. 3.5 2012700200034 1.930E-05 115. 3. 2012700200035 2.110E-05 120. 5. 2012700200036 ENDDATA 6 0 2012700200037 ENDSUBENT 36 0 2012700299999 ENDENTRY 2 0 2012799999999