ENTRY 22320 20121209 22342232000000001 SUBENT 22320001 20121209 22342232000100001 BIB 17 68 2232000100002 REFERENCE (C,94GATLIN,1,360,199405) Main ref. 2232000100003 TITLE Neutron-induced fission cross sections of Bi-209 and 2232000100004 U-238 in the intermediate energy region 2232000100005 AUTHOR (V.P.Eismont,A.V.Prokofyev,A.A.Rimski-Korsakov, 2232000100006 A.N.Smirnov,H.Conde,K.Elmgren,S.Hultqvist,J.Nilsson, 2232000100007 N.Olsson,E.Ramstrom,T.Ronnqvist,E.Traneus) 2232000100008 INSTITUTE (2SWDUPP) H.C.,K.E.,S.H.,J.N.,N.O.,E.R.,T.R.,E.T. 2232000100009 (4RUSRI ) V.P.E.,A.V.P.,A.A.R.-K.,A.N.S. 2232000100010 FACILITY (CYCLO,2SWDUPP) The Gustaf Werner Cyclotron at the 2232000100011 the Svedberg Laboratory, Uppsala, Sweden. 2232000100012 INC-SOURCE (P-LI7) 2232000100013 INC-SPECT .Quasi-monoenergetic neutrons produced in the 7Li(p,n) 2232000100014 reaction at zero degrees. About half of the neutrons 2232000100015 have the quoted energy, with a spread of less than 2232000100016 2 MeV FWHM, and the rest of the neutrons form a tail 2232000100017 extending from the maximum energy and down to zero, 2232000100018 with a virtually flat spectrum shape. The intensity 2232000100019 was about 100 000 maximum-energy neutrons per second 2232000100020 over the entire detector area. Time-of-flight 2232000100021 techniques allowed separation of maximum-energy and 2232000100022 tail neutron events for the 160 MeV data. 2232000100023 METHOD (ABSFY,TOF) 2232000100024 DETECTOR (TRD) Thin film breakdown counters were placed close 2232000100025 to the fissile targets in the neutron beam. 2232000100026 PART-DET (FF) Fission fragments were detected. 2232000100027 MONITOR (1-H-1(N,EL)1-H-1,,DA) 2232000100028 180 degree n-p scattering (i.e. the H(n,p) reaction 2232000100029 at zero degrees) was measured simultaneously for the 2232000100030 160 MeV data, using the magnetic spectrometer lisa. 2232000100031 MONIT-REF (22277002,T.E.O.Ericson+,J,PRL,75,1046,1995) 2232000100032 SAMPLE .The samples were prepared by vacuum evaporation onto 2232000100033 a 0.2 mm stainless steel backing using planetary 2232000100034 rotation during evaporation to obtain a good homo- 2232000100035 geneity. The samples were 80 mm in diameter, and had 2232000100036 thicknesses of 1.6 and 0.1 mg per cm2 for Bi-209 and 2232000100037 U-238, respectively. The accuracy of the sample 2232000100038 thickness was about 2%, and the inhomogeneity 2232000100039 of the samples was less than 2%. It was found 2232000100040 that the relative abundance of heavy fissile 2232000100041 admixtures (like uranium) in the bismuth sample was 2232000100042 less than 5 ppm. 2232000100043 CORRECTION .Corrections for anisotropy of fission and linear 2232000100044 momentum transfer from the incident particle to the 2232000100045 fissioning nucleus were included when the fission 2232000100046 cross sections were computed. Some correction factors 2232000100047 were estimated using proton-induced fission data. 2232000100048 ERR-ANALYS (ERR-T) Total error includes: 2232000100049 (ERR-1) The uncertainties are due to neutron 2232000100050 fluxes (about 8%), 2232000100051 (ERR-2) detector calibration (3%), 2232000100052 (ERR-3,1.,2.) target thickness (1-2%), 2232000100053 (ERR-S,3.,5.) counting statistics (3-5%) 2232000100054 and an uncertainty of the relation of 2232000100055 fission events induced by neutrons from the high 2232000100056 energy peak in contrast to the low-energy tail of the 2232000100057 neutron spectrum. The uncertainty is much larger for 2232000100058 the 135 MeV data because no monitor was available, 2232000100059 and hence the fluxes are less accurate. 2232000100060 STATUS (PRELM) Data are preliminary. 2232000100061 (SPSDD,22646001) Final data are published 2232000100062 in Phys.Rev. C,53,2911 2232000100063 (TABLE) .Taken from table 1 of 94GATLIN,,360 2232000100064 HISTORY (19960925C) J.B. 2232000100065 (19970214E) 2232000100066 (20121209A) SD: Updated to new date formats,lower case.2232000100067 Corrected according last EXFOR rules and Dict. 2232000100068 STATUS (SPSDD) was added to Subents 1-3. ERR-ANALYS 2232000100069 was update, MONIT-REF and and COMMON sect. were added 2232000100070 ENDBIB 68 0 2232000100071 COMMON 2 3 2232000100072 ERR-1 ERR-2 2232000100073 PER-CENT PER-CENT 2232000100074 8. 3. 2232000100075 ENDCOMMON 3 0 2232000100076 ENDSUBENT 75 0 2232000199999 SUBENT 22320002 20121209 22342232000200001 BIB 2 3 2232000200002 REACTION (83-BI-209(N,F),,SIG) 2232000200003 STATUS (SPSDD,22646010) Final data are published 2232000200004 in Phys.Rev. C,53,2911 2232000200005 ENDBIB 3 0 2232000200006 NOCOMMON 0 0 2232000200007 DATA 4 2 2232000200008 EN EN-ERR DATA ERR-T 2232000200009 MEV MEV MB MB 2232000200010 1.3500E+02 1.0000E+00 4.0000E+01 9.0000E+00 2232000200011 1.6000E+02 1.0000E+00 5.1000E+01 6.0000E+00 2232000200012 ENDDATA 4 0 2232000200013 ENDSUBENT 12 0 2232000299999 SUBENT 22320003 20121209 22342232000300001 BIB 2 3 2232000300002 REACTION (92-U-238(N,F),,SIG) 2232000300003 STATUS (SPSDD,22646009) Final data are published 2232000300004 in Phys.Rev. C,53,2911 2232000300005 ENDBIB 3 0 2232000300006 NOCOMMON 0 0 2232000300007 DATA 4 2 2232000300008 EN EN-ERR DATA ERR-T 2232000300009 MEV MEV B B 2232000300010 1.3500E+02 1.0000E+00 1.4400E+00 2.6000E-01 2232000300011 1.6000E+02 1.0000E+00 1.1800E+00 1.5000E-01 2232000300012 ENDDATA 4 0 2232000300013 ENDSUBENT 12 0 2232000399999 ENDENTRY 3 0 2232099999999