ENTRY 22591 20170204 22592259100000001 SUBENT 22591001 20170204 22592259100100001 BIB 17 45 2259100100002 TITLE .Excitation function of La-139(N,He3)Cs-137 reaction 2259100100003 near its threshold. 2259100100004 AUTHOR (S.M.Qaim, R.Woelfle) 2259100100005 REFERENCE (J,AHP,69,137,1991) 2259100100006 REL-REF (I,,R.Woelfle+,J,RCA,50,5,1990) Experimental details, 2259100100007 (n,t) reaction data . 2259100100008 INSTITUTE (2GERJUL) Waim, Woelfle 2259100100009 (2ZZZGEL) Experimental site 2259100100010 FACILITY (VDG,2ZZZGEL) The Geel CN-type Van de Graaff machine. 2259100100011 INC-SOURCE (D-T) Monoenergetic neutrons in the energy range of 2259100100012 16.32 to 19.02-MeV were produced via the 2259100100013 H-3(d,N)He-4 reaction. 2259100100014 INC-SPECT Monoenergetic neutrons. 2259100100015 METHOD (ACTIV) Irradiation time 55.39 hr. 2259100100016 (CHSEP) 2259100100017 Radiated sample was dissolved in 350-ml of 2259100100018 2M HCl acid containing 240-mg of Cs carrier. After 2259100100019 chemical separation radiocesium sample was counted for2259100100020 several weeks periodically over several years. 2259100100021 Chemical yield ~80%, the decontamination factor >10**6.2259100100022 DETECTOR (GELI) A large-sized Ge(Li) detector. 2259100100023 MONITOR ((MONIT)57-LA-139(N,A)55-CS-136,,SIG) 2259100100024 MONIT-REF (22108005,R.Woelfle+,J,ARI,39,407,1988) 2259100100025 CORRECTION For background, for decay, chemical yield,absorption, 2259100100026 detector efficiency,geometry of counting, gamma-ray 2259100100027 abundance. 2259100100028 ADD-RES (COMP).Hauser-Feshbach calculations. 2259100100029 ERR-ANALYS (DATA-ERR) The overall error was obtained by combining 2259100100030 all the individual errors in quadrature and 2259100100031 amounted to between 45 to 80%. The major sources of 2259100100032 errors in the present measurements were weak count 2259100100033 rates of Cs-137, error up to 70%. 2259100100034 (EN-ERR).The deviations do not give errors, they show 2259100100035 energy spreads due to angle emission and deuteron 2259100100036 energy loss in the Ti(t)-target. 2259100100037 (MONIT-ERR).The uncertainty in the excitation function 2259100100038 of the monitor reaction is 8%, which was used for 2259100100039 neutron flux measurements. 2259100100040 STATUS (TABLE) Table I of AHP,69,137,1991 2259100100041 HISTORY (20061115C) S.M. 2259100100042 (20061214A) Last corrections have been done 2259100100043 (20170204A) M.M. "COREL,21916001" was deleted - 2259100100044 in 21916 measurement at Juelich. 2259100100045 Ref. RCA,50,5,1990 was moved in REL-REF. 2259100100046 Reaction was corrected in Subent 002. 2259100100047 ENDBIB 45 0 2259100100048 NOCOMMON 0 0 2259100100049 ENDSUBENT 48 0 2259100199999 SUBENT 22591002 20170204 22592259100200001 BIB 5 19 2259100200002 REACTION (57-LA-139(N,X)55-CS-137,,SIG) This is the major 2259100200003 contributing process, however, small contribution, 2259100200004 less than 20% from the (N,dp) and (N,2Np) processes 2259100200005 may also occur. 2259100200006 DECAY-DATA (55-CS-137,30.17YR,DG,662.,0.935) 2259100200007 SAMPLE .The La-segment, 20 to 28-g. Purity 99.6% . 2259100200008 1. The weight La-segment is 20.04 g, angular range 2259100200009 is 0 - 40 degree, for EN=19.02 MeV 2259100200010 2. The weight La-segment is 28.70 g, angular range 2259100200011 is 40 - 65 degree, for EN=17.68 MeV 2259100200012 3. The weight La-segment is 21.88 g, angular range 2259100200013 is 65 - 62 degree, for EN=16.32 MeV 2259100200014 ANALYSIS La-139(N,HE3)La-137 is major contributing process, 2259100200015 however, small contribution, < 20% from the (n,dp) and2259100200016 (n,2np) processes on La-139 ( Q-values -7.53, -13.03,2259100200017 -15.25 MeV,respectively) may also occur. 2259100200018 HISTORY (20170204A) M.M. FLAG was deleted, information was 2259100200019 moved in SAMPLE. 2259100200020 (N,HE3) -> (N,X) - see ANALYSIS. 2259100200021 ENDBIB 19 0 2259100200022 NOCOMMON 0 0 2259100200023 DATA 6 3 2259100200024 EN EN-ERR DATA DATA-ERR MONIT MONIT-ERR 2259100200025 MEV MEV MICRO-B MICRO-B MB MB 2259100200026 19.02 0.56 48. 28. 3.35 0.27 2259100200027 17.68 0.77 60. 27. 3.29 0.26 2259100200028 16.32 0.58 7. 5.5 3.05 0.24 2259100200029 ENDDATA 5 0 2259100200030 ENDSUBENT 29 0 2259100299999 ENDENTRY 2 0 2259199999999