ENTRY 21358 20051121 21742135800000001 SUBENT 21358001 20051121 21742135800100001 BIB 15 35 2135800100002 INSTITUTE (2GERMUN) 2135800100003 REFERENCE (J,ZN/A,19,354,196403) 2135800100004 AUTHOR (R.SCHERM,W.SCHWATZ) 2135800100005 TITLE -Measurement of very small incoherent scattering cross 2135800100006 sections with thermal neutrons.- (In german). 2135800100007 FACILITY (REAC,2GERMUN) Frm. 2135800100008 (CHOPS,2GERMUN) Slow chopper, 2135800100009 .Neutron guide, its use reduces the N background. 2135800100010 INC-SOURCE (REAC ) 2135800100011 SAMPLE .Very (spectroscopically) pure samples, monoisotopic, 2135800100012 99.999 perc. Al (aiag company), 99.999 perc. Bi 2135800100013 (franke company),grains melted in high vacuum, and 2135800100014 99.98 perc. Be (company pechiney). All samples are 2135800100015 cylindrical, 26 mm diam * 90 mm long, and 2135800100016 polycristalline. 2135800100017 METHOD .Scattering measurement, method described by 2135800100018 J.M.Cassels, Progr.Nucl.Phys.1,185(1950)I. 2135800100019 DETECTOR (BF3 ) 3 detectors, enriched boron. 2135800100020 MONITOR (1-H-1(N,THS)1-H-1,INC,SIG) 2135800100021 COMMENT .Data are upper limits since the sample may contain 2135800100022 spectroscopically not measurable contaminations. 2135800100023 STATUS (NDD) Data taken from neudada. 2135800100024 CORRECTION .Background, different detection efficiencies for the 2135800100025 sample and the monitor-samples (10 per-cent correct.) 2135800100026 And correction for the difference in temperature 2135800100027 between the sample measurements and the monitor 2135800100028 (callibration) measurements. 2135800100029 ERR-ANALYS .Only statistical errors of the measurements + 2135800100030 callibration are given. Coherent scattering from H 2135800100031 and C in the polyethylene may cause a maximum error 2135800100032 of + 5 per-cent. 2135800100033 HISTORY (19800214T) G.C. 2135800100034 (19800222E) 2135800100035 (20050913A) Date is corrected 2135800100036 (20051121U) Last checking has been done. 2135800100037 ENDBIB 35 0 2135800100038 COMMON 2 3 2135800100039 TEMP MONIT 2135800100040 K B 2135800100041 4.2 7.97E+01 2135800100042 ENDCOMMON 3 0 2135800100043 ENDSUBENT 42 0 2135800199999 SUBENT 21358002 20051121 21742135800200001 BIB 1 1 2135800200002 REACTION (4-BE-9(N,THS)4-BE-9,INC,SIG,,AV) 2135800200003 ENDBIB 1 0 2135800200004 NOCOMMON 0 0 2135800200005 DATA 4 1 2135800200006 EN-MIN EN-MAX DATA ERR-S 2135800200007 MILLI-EV MILLI-EV MB MB 2135800200008 9.3E-01 1.83 4. 1. 2135800200009 ENDDATA 3 0 2135800200010 ENDSUBENT 9 0 2135800299999 SUBENT 21358003 20051121 21742135800300001 BIB 1 1 2135800300002 REACTION (13-AL-27(N,THS)13-AL-27,INC,SIG,,AV) 2135800300003 ENDBIB 1 0 2135800300004 NOCOMMON 0 0 2135800300005 DATA 4 1 2135800300006 EN-MIN EN-MAX DATA ERR-S 2135800300007 MILLI-EV MILLI-EV MB MB 2135800300008 4.E-01 1.83 1.E+01 1. 2135800300009 ENDDATA 3 0 2135800300010 ENDSUBENT 9 0 2135800399999 SUBENT 21358004 20051121 21742135800400001 BIB 1 1 2135800400002 REACTION (83-BI-209(N,THS)83-BI-209,INC,SIG,,AV) 2135800400003 ENDBIB 1 0 2135800400004 NOCOMMON 0 0 2135800400005 DATA 4 1 2135800400006 EN-MIN EN-MAX DATA ERR-S 2135800400007 MILLI-EV MILLI-EV MB MB 2135800400008 4.E-01 9.3E-01 1.2E+01 1. 2135800400009 ENDDATA 3 0 2135800400010 ENDSUBENT 9 0 2135800499999 ENDENTRY 4 0 2135899999999