ENTRY 30764 20090908 31413076400000001 SUBENT 30764001 20090908 31413076400100001 BIB 15 60 3076400100002 TITLE Total neutron cross section measurements on C,Al,Mg, 3076400100003 Cu,Ge and Pb at energies around 20 MeV. 3076400100004 AUTHOR (J.R.Morales,L.O.Figueroa,P.Martens,J.L.Romero, 3076400100005 R.L.Vallejos) 3076400100006 INSTITUTE (3CHLSAN) 3076400100007 (1USADAV) Fourth author 3076400100008 REFERENCE (J,NIM/A,300,312,1991) 3076400100009 (P,INDC(CHL)-003,199009) 3076400100010 (P,INDC(CHL)-002,198708) Preliminary data, superseded 3076400100011 SAMPLE Targets characteristics 3076400100012 ***************************************************** 3076400100013 Element Nuclei Length Area Purity 3076400100014 density 3076400100015 (10**22/cm2) ( cm ) ( cm-2 ) ( % ) 3076400100016 C 11.30 3.00 4.95 99.0 3076400100017 MG 4.30 3.02 5.11 99.7 3076400100018 AL 6.01 2.54 5.01 99.7 3076400100019 CU 8.46 1.50 5.07 99.7 3076400100020 GE 4.40 2.64 6.84 99.7 3076400100021 PB 3.30 2.00 6.25 99.7 3076400100022 ***************************************************** 3076400100023 MONITOR Absolute measurements 3076400100024 FACILITY (CYCLO,3CHLSAN) 56 cm isochronous cyclotron 3076400100025 INC-SOURCE (D-T) 3076400100026 * Deuteron beam of 3.41 +- 0.08 MeV 3076400100027 * The beam intensity was restricted to about 1 m AMP 3076400100028 * Faraday cup used for deuteron beam monitoring 3076400100029 METHOD (TRN) Transmission measurements 3076400100030 (TOF) 3076400100031 DETECTOR (SCIN) 3076400100032 * Two neutron detectors were used to determine the 3076400100033 number of neutrons coming from the Ti-T target; each 3076400100034 one consists of a rectangular sheet of plastic 3076400100035 scintillator NE-102 of 0.8 mm in thickness and 3076400100036 35.8 x 58.7 mm2 in area. The neutron to proton 3076400100037 converter was a 2 mm paraffin sheet preceded by a 3076400100038 2 mm graphite sheet. 3076400100039 * A third detector , a 5.04 cm height by 5.02 cm 3076400100040 diameter NE-102 pastic scint.,was used to monitor 3076400100041 the gamma flash from the target. 3076400100042 CORRECTION Several corrections were considered, most of them are 3076400100043 eliminated by the ratio involving target in and out. 3076400100044 One that remains is due to low energy neutrons from 3076400100045 reactions between deuterons and backing materials and 3076400100046 from the Pb in Faraday cup. 3076400100047 This represent less than 4 % to the measured sigma. 3076400100048 PART-DET (N) 3076400100049 ERR-ANALYS (DATA-ERR) The major uncertainties correspond to 3076400100050 * statistics, 3076400100051 * geometrical measurements, 3076400100052 * target purity and 3076400100053 * correction for low energy neutrons. 3076400100054 STATUS (TABLE) Data taken from INDC(CHL)-003 report,Sept.1990 3076400100055 are the same as from J,NIM/A,300,312,91 3076400100056 HISTORY (19871126C) DG. 3076400100057 (19900618A) VOF.-Data updates and information added 3076400100058 according to priv. communication from authors. 3076400100059 (19900920U) VOF.- New reference added - 3076400100060 (19911121A) HW.-New reference added 3076400100061 (20090908A) SD:Updated to new date formats,lower case. 3076400100062 ENDBIB 60 0 3076400100063 NOCOMMON 0 0 3076400100064 ENDSUBENT 63 0 3076400199999 SUBENT 30764002 20090908 31413076400200001 BIB 1 1 3076400200002 REACTION (6-C-12(N,TOT),,SIG) 3076400200003 ENDBIB 1 0 3076400200004 NOCOMMON 0 0 3076400200005 DATA 3 2 3076400200006 EN DATA DATA-ERR 3076400200007 MEV B B 3076400200008 17.6 1.43 0.07 3076400200009 19.8 1.39 0.07 3076400200010 ENDDATA 4 0 3076400200011 ENDSUBENT 10 0 3076400299999 SUBENT 30764003 20090908 31413076400300001 BIB 1 1 3076400300002 REACTION (12-MG-0(N,TOT),,SIG) 3076400300003 ENDBIB 1 0 3076400300004 NOCOMMON 0 0 3076400300005 DATA 3 2 3076400300006 EN DATA DATA-ERR 3076400300007 MEV B B 3076400300008 17.6 1.71 0.08 3076400300009 19.8 1.63 0.08 3076400300010 ENDDATA 4 0 3076400300011 ENDSUBENT 10 0 3076400399999 SUBENT 30764004 20090908 31413076400400001 BIB 1 1 3076400400002 REACTION (13-AL-27(N,TOT),,SIG) 3076400400003 ENDBIB 1 0 3076400400004 NOCOMMON 0 0 3076400400005 DATA 3 2 3076400400006 EN DATA DATA-ERR 3076400400007 MEV B B 3076400400008 17.6 1.77 0.09 3076400400009 19.8 1.65 0.08 3076400400010 ENDDATA 4 0 3076400400011 ENDSUBENT 10 0 3076400499999 SUBENT 30764005 20090908 31413076400500001 BIB 1 1 3076400500002 REACTION (29-CU-0(N,TOT),,SIG) 3076400500003 ENDBIB 1 0 3076400500004 NOCOMMON 0 0 3076400500005 DATA 3 2 3076400500006 EN DATA DATA-ERR 3076400500007 MEV B B 3076400500008 17.6 2.76 0.13 3076400500009 19.8 2.61 0.10 3076400500010 ENDDATA 4 0 3076400500011 ENDSUBENT 10 0 3076400599999 SUBENT 30764006 20090908 31413076400600001 BIB 1 1 3076400600002 REACTION (32-GE-0(N,TOT),,SIG) 3076400600003 ENDBIB 1 0 3076400600004 NOCOMMON 0 0 3076400600005 DATA 3 2 3076400600006 EN DATA DATA-ERR 3076400600007 MEV B B 3076400600008 17.6 2.98 0.14 3076400600009 19.8 2.77 0.13 3076400600010 ENDDATA 4 0 3076400600011 ENDSUBENT 10 0 3076400699999 SUBENT 30764007 20090908 31413076400700001 BIB 1 1 3076400700002 REACTION (82-PB-0(N,TOT),,SIG) 3076400700003 ENDBIB 1 0 3076400700004 NOCOMMON 0 0 3076400700005 DATA 3 2 3076400700006 EN DATA DATA-ERR 3076400700007 MEV B B 3076400700008 17.6 5.31 0.26 3076400700009 19.8 6.02 0.29 3076400700010 ENDDATA 4 0 3076400700011 ENDSUBENT 10 0 3076400799999 ENDENTRY 7 0 3076499999999