ENTRY M0592 20090323 M047M059200000001 SUBENT M0592001 20090323 M047M059200100001 BIB 15 46 M059200100002 INSTITUTE (1CANMON) M059200100003 REFERENCE (J,NP/A,209,181,1973) M059200100004 AUTHOR (W.DEL BIANCO,S.KUNDU,P.BOUCHER) M059200100005 TITLE Measurement of the 50Cr(g,n)49cr cross section M059200100006 with monocromatic gamma-rays. M059200100007 FACILITY (VDG,1CANMON) M059200100008 INC-SOURCE (MPH=(1-H-3(P,G))) M059200100009 SAMPLE Chromium metal samples were used with a purity of M059200100010 99.9 %. M059200100011 METHOD (ACTIV) Resulting 49Cr positron activity M059200100012 measurement. M059200100013 DETECTOR (COIN,NAICR) Detector consisting of two 7.62 cm x M059200100014 7.62 cm NaI(Tl) crystals. M059200100015 PART-DET (B+) M059200100016 ANALYSIS Direct positron activity measurement. M059200100017 ERR-ANALYS (ERR-S) Statistical errors are given. M059200100018 (ERR-1) Uncertainties for positron detector absolute M059200100019 efficiency 10.0 %; M059200100020 (ERR-2) Uncertainties for positron detector radial M059200100021 efficiency 4.0 %; M059200100022 (ERR-3) Uncertainties for angle NaI crystal - photon M059200100023 beam 1.5 %; M059200100024 (ERR-4) Uncertainties for absorption in paraffin M059200100025 between NaI crystal collimator and target - 2.0 %; M059200100026 (ERR-5) Uncertainties for solid angle subtended by M059200100027 NaI crystal collimator to target 4.0 %; M059200100028 The systematic uncertainties for extrapolation of M059200100029 g-ray spectrum was estimated as 4.0 - 20.0 %. M059200100030 COMMENT The 50Cr(g,n)49Cr cross section has been measured M059200100031 over the energy range Eg = 20.43 to Eg = 22.22 MeV M059200100032 using monochromatic g-rays from the 3H(p,g)4He M059200100033 reaction and detecting the resulting 49Cr positron M059200100034 activity. The g-rays were monitored by 12.7 cm x M059200100035 15.2 cm NaI(Tl) crystal. The positron activity was M059200100036 was determined by a coincidence detector consisting M059200100037 of two 7.62 cm x 7.62 cm NaI(Tl) crystal set on the M059200100038 annihilation radiation photopeaks. The g-ray energy M059200100039 resolution was less than 110 keV over the whole M059200100040 energy range. structure in the cross section was M059200100041 not observed. M059200100042 STATUS (TABLE) Data from the Table 1. M059200100043 Data were compiled at the USA BNL NNDC by M059200100044 V.V.Varlamov. M059200100045 HISTORY (19990331C) M059200100046 (20081110A) Corrected by V.Varlamov: ENTRY N2 M059200100047 shifted, lowercase. M059200100048 ENDBIB 46 0 M059200100049 COMMON 5 3 M059200100050 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 M059200100051 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT M059200100052 10. 4. 1.5 2. 4. M059200100053 ENDCOMMON 3 0 M059200100054 ENDSUBENT 53 0 M059200199999 SUBENT M0592002 20090323 M047M059200200001 BIB 1 1 M059200200002 REACTION (24-CR-50(G,N)24-CR-49,,SIG) M059200200003 ENDBIB 1 0 M059200200004 NOCOMMON 0 0 M059200200005 DATA 3 13 M059200200006 EN DATA ERR-S M059200200007 MEV MB MB M059200200008 20.43 25.2 2.5 M059200200009 20.58 33.4 2.6 M059200200010 20.73 31.3 2.3 M059200200011 20.88 27.6 2. M059200200012 21.03 30.9 2. M059200200013 21.18 25.3 1.8 M059200200014 21.33 29. 1.9 M059200200015 21.48 27.7 1.7 M059200200016 21.63 27.9 1.7 M059200200017 21.78 25.6 1.6 M059200200018 21.92 27.1 1.6 M059200200019 22.07 27.8 2.6 M059200200020 22.22 24.6 2.1 M059200200021 ENDDATA 15 0 M059200200022 ENDSUBENT 21 0 M059200299999 ENDENTRY 2 0 M059299999999