ENTRY 10023 19990719 00001002300000001 SUBENT 10023001 19990719 00001002300100001 BIB 14 45 1002300100002 INSTITUTE (1USALAS) 1002300100003 REFERENCE (J,NSE,40,136,197004) 1002300100004 AUTHOR (H.O.MENLOVE, R.H.AUGUSTSON, C.N.HENRY) 1002300100005 TITLE Cross Section for the Delayed-Neutron Yield from the 1002300100006 17O(n,p)17N reaction at 14.1 MeV. 1002300100007 FACILITY (ACCEL) 300-keV pulsed positive ion accelerator. 1002300100008 INC-SOURCE (D-T) 3H(d,n) reaction. 1002300100009 SAMPLE Two H2O samples. First sample = 7.64 g, enriched 1002300100010 to 3.85%. Second sample = 1.686 g, enriched to 34.0%. 1002300100011 Both contained in 2.54 cm diameter stainless steel 1002300100012 disks, wall thickness 0.127 mm. 1002300100013 Disks 10 cm from source at 90 deg to accelerator axis. 1002300100014 DETECTOR (PROPC) Five 3He proportional counters, imbedded in 23 1002300100015 cm diameter polyethylene cylinder. Measured to have 1002300100016 flat efficiency (within +-3%) over energy range of 1002300100017 neutron groups. Detectors 31 cm from sample disks. 1002300100018 ANALYSIS Determined delayed neutron half-life to be 4.17+-0.02 1002300100019 sec. Cross section is average of results for thin 1002300100020 sample (21.4+-1.7 mb) and for thick sample 1002300100021 (21.8+-2.0 mb). 1002300100022 MONITOR For flux normalization, counted source alphas. For 1002300100023 efficiency, calibrated 238PuLi and 238PuLiF neutron 1002300100024 sources. 1002300100025 CORRECTION Determined effects of neutron scattering and absorption1002300100026 and self-absorption of delayed neutrons. Effects of 1002300100027 room-return source neutrons assumed small due to room 1002300100028 geometry. 1002300100029 ERR-ANALYS (ERR-T) Absolute unceratinty and includes uncertainty 1002300100030 in (for thick and thin samples): 1002300100031 thin thick 1002300100032 ------------ ---- ----- 1002300100033 absolute flux - 5% 5% 1002300100034 detector calibration - 6% 6% 1002300100035 geometry - 1% 2% 1002300100036 source neutron scattering - 0.5% 2% 1002300100037 scattering and self-absorption of 1002300100038 delayed neutrons - 0.8% 2% 1002300100039 counting statistics - 0.9% 2% 1002300100040 STATUS (APRVD) Approved by author 1002300100041 Data taken from reference. 1002300100042 HISTORY (19700901C) 1002300100043 (19731231U) BIB corrections 1002300100044 (19750905A) BIB corrections 1002300100045 (19800723A) Converted to REACTION formalism 1002300100046 (19990719A) Converted to new date formats, lower case. 1002300100047 ENDBIB 45 0 1002300100048 NOCOMMON 0 0 1002300100049 ENDSUBENT 48 0 1002300199999 SUBENT 10023002 19990719 00001002300200001 BIB 2 2 1002300200002 REACTION (8-O-17(N,P)7-N-17,DL,SIG,N) 1002300200003 HISTORY (19811016A) Corrected title heading. 1002300200004 ENDBIB 2 0 1002300200005 NOCOMMON 0 0 1002300200006 DATA 3 1 1002300200007 EN DATA ERR-T 1002300200008 MEV MB MB 1002300200009 14.1 21.5 1.7 1002300200010 ENDDATA 3 0 1002300200011 ENDSUBENT 10 0 1002300299999 ENDENTRY 2 0 1002399999999