ENTRY 23264 20150802 22442326400000001 SUBENT 23264001 20150802 22442326400100001 BIB 11 26 2326400100002 TITLE Determination of (n,gamma) Cross Sections of 241Am by 2326400100003 Cold Neutron Activation. 2326400100004 AUTHOR (C.Genreith, M.Rossbach, Zs.Revay, P.Kudejova) 2326400100005 INSTITUTE (2GERJUL) C.Genreith, M.Rossbac 2326400100006 (2GERMUN) Zs.Revay, P.Kudejova 2326400100007 REFERENCE (J,NDS,119,69,2014) 2326400100008 FACILITY (REAC,2GERMUN) PGAA station of the FRM II in Garching. 2326400100009 INC-SOURCE (REAC) Cold neutron beam 2326400100010 INC-SPECT The energy distribution of the cold neutron beam is 2326400100011 presented on Fig.2 of J,NDS,119,69,2014. 2326400100012 The neutron flux was determined using the count rate 2326400100013 of the 412 keV peak and the counting efficiency of the 2326400100014 detector. 2326400100015 Thermal equivalent flux of 2.5*10**10 1/cm2/s . 2326400100016 METHOD (ACTIV) Samples were irradiated for 5 to 12 h at a 2326400100017 thermal equivalent flux of 2.5*10**10 1/cm2/s . 2326400100018 The decay radiation was counted for 1 hr. 2326400100019 DETECTOR (HPGE) The gamma-ray spectra were measured using a 2326400100020 DSPEC 50 MCA and a 60-% n-type Poptop HPGe detector. 2326400100021 152Eu and 133Ba calibration sources with a given 2326400100022 uncertainty of 1.5% were measured in order to calculate2326400100023 the detector efficiency. 2326400100024 COMMENT This work was done with financial support by the 2326400100025 Bundesministerium fuer Bildung und Forschung (BMBF) 2326400100026 under grant 02S9052A. 2326400100027 HISTORY (20150802C) M.M. 2326400100028 ENDBIB 26 0 2326400100029 NOCOMMON 0 0 2326400100030 ENDSUBENT 29 0 2326400199999 SUBENT 23264002 20150802 22442326400200001 BIB 8 39 2326400200002 REACTION 1(95-AM-241(N,G)95-AM-242-G,,SIG) 2326400200003 2(95-AM-241(N,G)95-AM-242-G,,SIG) 2326400200004 SAMPLE Two samples were prepared by drying the droplet on top 2326400200005 of small circular Au foils (3mm diam., 0.003 mm thick),2326400200006 which serve as neutron flux monitors : 2326400200007 Activity [MBq] Mass of 241Am [microg] Au mass [mg] 2326400200008 1 3.87 +- 0.03 30.50 +- 0.24 0.432 +- 0.005 2326400200009 2 4.66 +- 0.04 36.72 +- 0.28 0.434 +- 0.005 2326400200010 The activity of the 241Am was determined with an 2326400200011 uncertainty of 0.75 %. 2326400200012 DECAY-DATA (95-AM-242-G,16.02HR) 16.02+-0.02 hr 2326400200013 (94-PU-242,,XR,99.5,,XR,103.4) 2326400200014 The Kalpha x-rays of 242Pu following the electron 2326400200015 capture decay of the 242gAm(16.02(2) h) are used for 2326400200016 the capture cross section determination. 2326400200017 The emission probability from the 242Pu x-rays were 2326400200018 taken from : M.B+, Table of Radionuclides Vol. V.: 2326400200019 Bureau International des Poids et Mesures (2010). 2326400200020 MONITOR (79-AU-198(N,G)79-AU-199,PAR,SIG) 2326400200021 For neutron flux. 2326400200022 CORRECTION Corrections for photon absorption in the quartz glass,2326400200023 for the neutron absorption in the gold foil (0.3 %) and2326400200024 the decay corrections were applied to obtain the 2326400200025 saturation activity. 2326400200026 The contribution of influence of the 241Am gamma-rays 2326400200027 (98.97 keV, 102.98 keV) in the order of 5-10% was also2326400200028 subtracted. 2326400200029 ANALYSIS The region of peaks was integrated channel by channel a2326400200030 the baseline subtracted. After corrections the 2326400200031 Am-242(n,Gamma)Am-242g cross-section was determined fro2326400200032 the amount of Am-242, the saturation activity and the 2326400200033 measured neutron flux. 2326400200034 ERR-ANALYS (ERR-T) Total uncertainty. 2326400200035 (ERR-1) Uncertainty of emission probability from Pu-2422326400200036 x-rays. 2326400200037 (ERR-2) Uncertainty of the efficiency ratio. 2326400200038 (ERR-3,,1.) All other uncertainties close or below 1.%.2326400200039 STATUS (TABLE) Table II of J,NDS,119,69,2014 2326400200040 (PRELM) Preliminary value. 2326400200041 ENDBIB 39 0 2326400200042 COMMON 3 3 2326400200043 E-NRM ERR-1 ERR-2 2326400200044 KEV PER-CENT PER-CENT 2326400200045 412. 5. 1. 2326400200046 ENDCOMMON 3 0 2326400200047 DATA 5 1 2326400200048 EN-DUMMY DATA 1ERR-T 1DATA 2ERR-T 2 2326400200049 EV B B B B 2326400200050 0.0253 663.0 28.8 649.9 28.2 2326400200051 ENDDATA 3 0 2326400200052 ENDSUBENT 51 0 2326400299999 SUBENT 23264003 20150802 22442326400300001 BIB 7 20 2326400300002 REACTION 1(95-AM-241(N,G)95-AM-242,,SIG,,,DERIV) 2326400300003 2(95-AM-241(N,G)95-AM-242,,SIG,,,DERIV) 2326400300004 SAMPLE Two samples were prepared by drying the droplet on top 2326400300005 of small circular Au foils (3mm diam., 0.003 mm thick),2326400300006 which serve as neutron flux monitors : 2326400300007 Activity [MBq] Mass of 241Am [microg] Au mass [mg] 2326400300008 1 3.87 +- 0.03 30.50 +- 0.24 0.432 +- 0.005 2326400300009 2 4.66 +- 0.04 36.72 +- 0.28 0.434 +- 0.005 2326400300010 The activity of the 241Am was determined with an 2326400300011 uncertainty of 0.75 %. 2326400300012 ANALYSIS Using the branching ratio of 242Am of 0.914(7) 2326400300013 determined by Fioni+ the 241Am(n,gamma)242Am thermal 2326400300014 neutron capture cross section was derived. 2326400300015 ASSUMED (ASSUM,95-AM-241(N,G)95-AM-242-G/T,,SIG/RAT) 2326400300016 REL-REF (R,22696003,G.Fioni+,J,NP/A,693,546,2001) 2326400300017 ERR-ANALYS (ERR-T) Total uncertainty. 2326400300018 Partial uncertainties are in Subent 002. 2326400300019 STATUS (TABLE) Table II of J,NDS,119,69,2014 2326400300020 (PRELM) Preliminary value. 2326400300021 (DEP,23264002) Directly measured data. 2326400300022 ENDBIB 20 0 2326400300023 COMMON 2 3 2326400300024 ASSUM ASSUM-ERR 2326400300025 NO-DIM NO-DIM 2326400300026 0.914 0.007 2326400300027 ENDCOMMON 3 0 2326400300028 DATA 5 1 2326400300029 EN-DUMMY DATA 1ERR-T 1DATA 2ERR-T 2 2326400300030 EV B B B B 2326400300031 0.0253 725.4 34.4 711.1 33.9 2326400300032 ENDDATA 3 0 2326400300033 ENDSUBENT 32 0 2326400399999 ENDENTRY 3 0 2326499999999