ENTRY 31591 20120502 31553159100000001 SUBENT 31591001 20120502 31553159100100001 BIB 10 20 3159100100002 TITLE Fission neutron spectrum averaged cross sections for 3159100100003 threshold reactions on arsenic 3159100100004 AUTHOR (E.L.Dorval, M.A.Arribere, S.Ribeiro Guevara, 3159100100005 I.M.Cohen, A.J.Kestelman, R.A.Ohaco, M.S.Segovia, 3159100100006 A.N.Yunes, M.Arrondo) 3159100100007 INSTITUTE (3ARGCAB,3ARGCNE) 3159100100008 (3ARGARG) Univ. Tecnologica Nacional, Buenos Aires 3159100100009 (3ARGARG) Univ. Nacional de Cuyo, Rio Negro 3159100100010 REFERENCE (J,JRN,270,603,2006) 3159100100011 FACILITY (REAC,3ARGCAB) RA-6 reactor core at Centro Atomico 3159100100012 Bariloche 3159100100013 INC-SPECT Fast neutron flux around 2.0x10**12 n/cm2/s. 3159100100014 METHOD (GSPEC,ACTIV) 3159100100015 DETECTOR (GE) 63 cm3 Ortec intrinsic-N germanium coaxial 3159100100016 detector. 3159100100017 All samples and monitors were measured at the same 3159100100018 geometry. 3159100100019 STATUS (APRVD) Entry approved by Dr. E.L.Dorval 3159100100020 HISTORY (20061213C) 3159100100021 (20120502A) On. STATUS moved to 002-003. 3159100100022 ENDBIB 20 0 3159100100023 COMMON 1 3 3159100100024 EN-DUMMY 3159100100025 MEV 3159100100026 1.5 3159100100027 ENDCOMMON 3 0 3159100100028 ENDSUBENT 27 0 3159100199999 SUBENT 31591002 20120502 31553159100200001 BIB 8 20 3159100200002 REACTION (33-AS-75(N,P)32-GE-75-M,,SIG,,FIS) 3159100200003 SAMPLE Eight analytical-quality samples of arsenic oxides 3159100200004 (As2O3 and As2O5) were individually irradiated under 3159100200005 1 mm thickness cadmium covers in polyethylene vials, 3159100200006 together with high purity aluminum wires, for 20 sec. 3159100200007 MONITOR (13-AL-27(N,P)12-MG-27,,SIG,,AV) 3159100200008 The 27Mg activity of the aluminum wire monitor was 3159100200009 counted immediately after, at the same geometry. 3159100200010 DECAY-DATA (32-GE-75-M,47.7SEC,DG,139.68,0.394) 3159100200011 DECAY-MON (12-MG-27,9.458MIN,DG,843.76,0.718, 3159100200012 DG,1014.44,0.28) 3159100200013 ERR-ANALYS (ERR-T) The main contributions to the systematic 3159100200014 uncertainty of the measured cross section were: 3159100200015 (MONIT-ERR) reference cross section value (5.1%) 3159100200016 (ERR-1) gamma-ray yields (2%) 3159100200017 (ERR-2,2.,3.) detector efficiency (2-3%) 3159100200018 (ERR-3,1.,2.) other contributions (half-lives, decay, 3159100200019 irradiation, and counting times). (1-2%) 3159100200020 STATUS (TABLE) Table 4 of J.Radioanal.Nucl.Chem.270(2006)603 3159100200021 HISTORY (20120502A) On. ERR-ANALYS: Coded information added 3159100200022 ENDBIB 20 0 3159100200023 NOCOMMON 0 0 3159100200024 DATA 5 1 3159100200025 DATA ERR-T MONIT MONIT-ERR ERR-1 3159100200026 MB MB MB MB PER-CENT 3159100200027 0.292 0.022 3.95 0.20 2. 3159100200028 ENDDATA 3 0 3159100200029 ENDSUBENT 28 0 3159100299999 SUBENT 31591003 20120502 31553159100300001 BIB 8 21 3159100300002 REACTION (33-AS-75(N,2N)33-AS-74,,SIG,,FIS) 3159100300003 SAMPLE Nine analytical-quality samples of As2O3 (As2O5 was 3159100300004 excluded because of its instability during 3159100300005 irradiations) were individually sealed in 3159100300006 polyethylene vials with a final disk shape of about 3159100300007 1 cm in diam. and less than 1 mm thickness. 3159100300008 The samples and high purity nickel wire monitors were 3159100300009 irradiated together in an aluminum can, for 4 hours. 3159100300010 DECAY-DATA (33-AS-74,17.77D,DG,595.83,0.594, 3159100300011 DG,634.78,0.155) 3159100300012 MONITOR (28-NI-58(N,P)27-CO-58,,SIG,,AV) 3159100300013 DECAY-MON (27-CO-58,70.86D,DG,810.76,0.9945) 3159100300014 ERR-ANALYS (ERR-T) The main contributions to the systematic 3159100300015 uncertainty of this cross section are: 3159100300016 (MONIT-ERR) reference cross section value (2.8%) 3159100300017 (ERR-1) gamma-ray yields (5%) 3159100300018 (ERR-2,2.,3.) detector efficiency (2-3%) 3159100300019 (ERR-3,1.,2.) other contributions (half-lives, decay, 3159100300020 irradiation, and counting times). (1-2%) 3159100300021 STATUS (TABLE) Table 5 of J.Radioanal.Nucl.Chem.270(2006)603 3159100300022 HISTORY (20120502A) On. ERR-ANALYS: Coded information added 3159100300023 ENDBIB 21 0 3159100300024 NOCOMMON 0 0 3159100300025 DATA 5 1 3159100300026 DATA ERR-T MONIT MONIT-ERR ERR-1 3159100300027 MB MB MB MB PER-CENT 3159100300028 0.371 0.032 111. 3. 5. 3159100300029 ENDDATA 3 0 3159100300030 ENDSUBENT 29 0 3159100399999 ENDENTRY 3 0 3159199999999