ENTRY 30181 20080208 31263018100000001 SUBENT 30181001 20080208 31263018100100001 BIB 13 57 3018100100002 INSTITUTE (3ISLSOR) 3018100100003 REFERENCE (J,NSE,18,105,1964) Full paper, graph, tables 3018100100004 (R,IA-755,196302) Identical to Nucl.Sc.Eng. 3018100100005 AUTHOR (S.Amiel,J.Gilat) 3018100100006 TITLE Reactions O-17(n,p)N-17 and O-18(n,d)N-17 with reactor 3018100100007 neutrons 3018100100008 INC-SOURCE (REAC) Israel swimming pool reactor at Soreq 3018100100009 INC-SPECT The fast spectrum at the end of the pneumatic transfer 3018100100010 tube at the core face of the reactor was 1.21*10**12 3018100100011 n/cm2*sec. 3018100100012 METHOD (ACTIV) Activation 3018100100013 The fission neutron spectrum averaged cross-sections 3018100100014 were measured by counting the delayed neutron emission 3018100100015 of irradiated water samples enriched with oxygen-17 and3018100100016 -18. Nitrogen-17, the delayed-neutron precursor, decays3018100100017 by beta- emission to excited states of oxygen-17 which 3018100100018 desintegrate instantaneously into oxygen-16 and a 3018100100019 neutron. It was assumed that nitrogen-17 decays 3018100100020 entirely through neutron emission and that the 3018100100021 neutrons belong to two energy groups = 1.22 MeV(61.5% 3018100100022 and 0.426 MeV(38.5%). 3018100100023 DETECTOR (PROPC) the neutron emission was measured in a 4Pi 3018100100024 geometry counting assembly consisting of 6 BF3 3018100100025 proportional neutron counters. The counting efficiency 3018100100026 was determined with calibrated radioactive neutron 3018100100027 sources over the range of 0.2 To 4.5 MeV. 3018100100028 ANALYSIS The results obtained from the five samples were 3018100100029 analysed using the following equation= 3018100100030 n = m(17)*Y(17) + m(18)*y(18) where 3018100100031 - n is the net neutron count of the sample 3018100100032 - m(17) and m(18) are the respective contents of 3018100100033 O-17 and O-18 in the sample in gram atoms. 3018100100034 - y(17) and y(18) are the yields of delayed 3018100100035 neutrons per gram atom from O-17(n,p) and 3018100100036 O-18(n,d) respectively. 3018100100037 Least squares fit analysis was used to determine the 3018100100038 two yields y(17) and y(18) 3018100100039 MONITOR (13-AL-27(N,A)11-NA-24,,SIG,,FIS) 3018100100040 DECAY-DATA (7-N-17,4.14SEC) assumed by author 3018100100041 (11-NA-24,15.0HR) assumed by author 3018100100042 ERR-ANALYS (DATA-ERR) includes (ERR-1 - ERR-5): 3018100100043 .Error on the fast flux determination = 5% 3018100100044 .Error in neutron counting efficiency = 3% 3018100100045 .Error on the delay period between the end of 3018100100046 irradiation and the start of counting = 2% 3018100100047 .Error on the duration of irradiation = 4% 3018100100048 .Error on the delayed neutron yields = 3018100100049 . 3% for O-17(n,p) 3018100100050 . 6% for O-18(n,d) 3018100100051 (ERR-1) Error on the fast flux determination 3018100100052 (ERR-2) Error in neutron counting efficiency 3018100100053 (ERR-3) Error on the delay period between the end of 3018100100054 irradiation and the start of counting 3018100100055 (ERR-4) Error on the duration of irradiation 3018100100056 (ERR-5) Error on the delayed neutron yields 3018100100057 HISTORY (19731003C) CA. 3018100100058 (20080208A) BIB section updated 3018100100059 ENDBIB 57 0 3018100100060 COMMON 6 3 3018100100061 EN-DUMMY MONIT ERR-1 ERR-2 ERR-3 ERR-4 3018100100062 MEV MB PER-CENT PER-CENT PER-CENT PER-CENT 3018100100063 1.5000E+00 6.0000E-01 5.0 3.0 2.0 4.0 3018100100064 ENDCOMMON 3 0 3018100100065 ENDSUBENT 64 0 3018100199999 SUBENT 30181002 20080208 31263018100200001 BIB 2 2 3018100200002 REACTION (8-O-17(N,P)7-N-17,,SIG,,FIS) 3018100200003 SAMPLE Water containing up to 3.8% oxygen-17 3018100200004 ENDBIB 2 0 3018100200005 COMMON 1 3 3018100200006 ERR-5 3018100200007 PER-CENT 3018100200008 3.0 3018100200009 ENDCOMMON 3 0 3018100200010 DATA 2 1 3018100200011 DATA DATA-ERR 3018100200012 MICRO-B MICRO-B 3018100200013 7.4000E+00 6.0000E-01 3018100200014 ENDDATA 3 0 3018100200015 ENDSUBENT 14 0 3018100299999 SUBENT 30181003 20080208 31263018100300001 BIB 2 2 3018100300002 REACTION (8-O-18(N,D)7-N-17,,SIG,,FIS) 3018100300003 SAMPLE Water containing up to 95% oxygen-18 3018100300004 ENDBIB 2 0 3018100300005 COMMON 1 3 3018100300006 ERR-5 3018100300007 PER-CENT 3018100300008 6.0 3018100300009 ENDCOMMON 3 0 3018100300010 DATA 2 1 3018100300011 DATA DATA-ERR 3018100300012 MICRO-B MICRO-B 3018100300013 8.6000E-02 8.0000E-03 3018100300014 ENDDATA 3 0 3018100300015 ENDSUBENT 14 0 3018100399999 ENDENTRY 3 0 3018199999999