ENTRY 22910 20060105 21752291000000001 SUBENT 22910001 20060105 21752291000100001 BIB 14 39 2291000100002 AUTHOR (S.OBERSTEDT, A.OBERSTEDT, F.-J.HAMBSCH, V.FRITSCH, 2291000100003 G.LOEVESTAM, N.KORNILOV) 2291000100004 TITLE .New Results on the Neutron-Induced Fission Cross 2291000100005 Section of 231-Pa for Incident Neutron Energies 2291000100006 between 0.8 and 3.5 MeV 2291000100007 INSTITUTE (2ZZZGEL) S.Oberstedt, F.-J.Hambsch, V.Fritsch, 2291000100008 G.Loevestam, N.Kornilov 2291000100009 (2SWDSWD) A.Oberstedt, Dept.of Natural Sciences, 2291000100010 Oerebro University, Sweden 2291000100011 REFERENCE (J,ANE,32,1867,2005) Main reference, data are given 2291000100012 FACILITY (VDG,2ZZZGEL) 7-MV Van De Graaff generator, proton 2291000100013 current up to 30 Micro-A 2291000100014 INC-SOURCE (P-T) 2291000100015 .Almost monoenergetic neutrons with negligible 2291000100016 low-energy contribution of the order of 1.5% of the 2291000100017 total yield 2291000100018 .Energy spectrum width EN-RSL-HW is a difference 2291000100019 betweem maximun and mean neutron energy 2291000100020 MONITOR (93-NP-237(N,F),,SIG) 2291000100021 METHOD (TOF) 2291000100022 (STTA) Stack-target irradiation 2291000100023 DETECTOR (FISCH) Frish-Gridded Fission Chamber with Pa-231 2291000100024 Back-To-Back and Np-237 Layers 2291000100025 SAMPLE .Pa-231 sample was obtained by means of spray-painting.2291000100026 Original diameter 28 mm was reduced by collimators to 2291000100027 6 and 8 mm, effective masses determined by alpha- 2291000100028 spectrometry are 53.4+-1.3 and 87.9+-2.7 microgram, 2291000100029 respectively. 2291000100030 .Standard Np-237 sample had 28 mm diameter and mass 2291000100031 182.2 microgram +- 1.7% 2291000100032 REL-REF (N,,C.BUDTZ-JOERGENSEN+,J,NIM/A,258,209,1987) Details 2291000100033 of Frish-grid fission chamber construction 2291000100034 CORRECTION .Number of fission events corrections for dead-time 2291000100035 is less than 4% 2291000100036 ERR-ANALYS (ERR-T) Total error equal to the sum of standard Np2372291000100037 cross section and sample mass error, Pa-231 2291000100038 sample mass error, statistical and systematic errors 2291000100039 of number of fission events for Np-237 and Pa-231 2291000100040 HISTORY (20060105C) S.M. 2291000100041 ENDBIB 39 0 2291000100042 NOCOMMON 0 0 2291000100043 ENDSUBENT 42 0 2291000199999 SUBENT 22910002 20060105 21752291000200001 BIB 3 6 2291000200002 REACTION (91-PA-231(N,F),,SIG) 2291000200003 STATUS (TABLE) S.Oberstedt, 2005-09-15, via INTERNET 2291000200004 REL-REF (A,10929002,S.PLATTARD+,J,PRL,46,633,1981) 2291000200005 (N,,M.PETIT+,J,NP/A,735,345,2004) Comparison with 2291000200006 Th-232(HE3,T)Pa-233* particle-transfer reaction SIG 2291000200007 (D,10223005,D.W.MUIR+,R,LA-4648-MS,197106) 2291000200008 ENDBIB 6 0 2291000200009 NOCOMMON 0 0 2291000200010 DATA 5 15 2291000200011 EN EN-RSL-HW DATA ERR-T ERR-T 2291000200012 EV EV B B PER-CENT 2291000200013 7.6 E+05 1.3E+05 0.544 0.026 4.8 2291000200014 8.5 E+05 1.2E+05 0.617 0.025 4.0 2291000200015 9.4 E+05 1.1E+05 0.698 0.026 3.7 2291000200016 1.04E+06 1.1E+05 0.796 0.036 4.6 2291000200017 1.15E+06 1.1E+05 0.774 0.029 3.7 2291000200018 1.25E+06 1.0E+05 0.876 0.034 3.9 2291000200019 1.38E+06 9. E+04 0.907 0.033 3.7 2291000200020 1.65E+06 9. E+04 0.974 0.038 3.9 2291000200021 1.95E+06 8. E+04 1.045 0.042 4.0 2291000200022 1.95E+06 8. E+04 1.070 0.043 4.0 2291000200023 1.95E+06 8. E+04 1.041 0.040 3.8 2291000200024 2.45E+06 7. E+04 1.022 0.039 3.8 2291000200025 2.95E+06 6. E+04 0.982 0.038 3.9 2291000200026 2.95E+06 6. E+04 0.978 0.040 4.1 2291000200027 3.46E+06 6. E+04 0.908 0.031 3.4 2291000200028 ENDDATA 17 0 2291000200029 ENDSUBENT 28 0 2291000299999 ENDENTRY 2 0 2291099999999