ENTRY 23328 20170323 22582332800000001 SUBENT 23328001 20170323 22582332800100001 BIB 11 27 2332800100002 TITLE Measurement of the 23Na(n,2n)22Na cross section at 2332800100003 En=19.45 MeV and model calculations of cross sections 2332800100004 for neutron induced reactions on 23Na 2332800100005 AUTHOR (B.Strohmaier, M.Wagner, H.Vonach) 2332800100006 INSTITUTE (2AUSIRK) 2332800100007 REFERENCE (C,91JUELIC,,663,1991) 2332800100008 FACILITY (VDG,2ZZZGEL) 7 MV Van-de-Graaff 2332800100009 INC-SOURCE (D-T) TiT target (Ti layer of 4.42 mg/cm2 thick, 3 cm 2332800100010 diam.) backed by Ag sheet (0.25 mm thick) and glued 2332800100011 in a cylindrical Al target holder (1 mm wall thick) 2332800100012 irradiated by deuteron beams (9.1 uA in average) at 2332800100013 3.00+/-0.02 MeV 2332800100014 METHOD (ACTIV) Irradiated for ~24 hrs 2332800100015 SAMPLE Fine-grained NaCl powder (purity > 99.5%, dried in a 2332800100016 desiccator at 120 deg-C immediately before weighing) 2332800100017 contained in an Al box (wall thick of 1.0 mm, inner 2332800100018 diameter of 12.0 mm, inner height of 10.00 mm). 2332800100019 The sample was sandwiched between two Ni foils 2332800100020 (0.125 mm thick, 12.0 mm diam.), and positioned at 2332800100021 12.3 deg relative to the deuteron beam. 2332800100022 DETECTOR (GE-IN) Intrinsig Ge gamma-ray detector 2332800100023 CORRECTION Corrected for 2332800100024 - Self-attenuation of 22Na gammas in NaCl powder 2332800100025 (3.4+/-0.3%) and 57Co gammas in Ni foils (1.7+/-0.2%)2332800100026 - Scattering by NaCl sample (~2.6%) and Ni foil 2332800100027 (~0.15%) as well as Al sample container walls 2332800100028 HISTORY (20170323C) On 2332800100029 ENDBIB 27 0 2332800100030 NOCOMMON 0 0 2332800100031 ENDSUBENT 30 0 2332800199999 SUBENT 23328002 20170323 22582332800200001 BIB 8 28 2332800200002 REACTION (11-NA-23(N,2N)11-NA-22,,SIG) 2332800200003 DECAY-DATA (11-NA-22,2.602YR,DG,1274.5) 2332800200004 MONITOR (28-NI-58(N,X)27-CO-57,IND,SIG) 2332800200005 57Co measurements were not started before complete 2332800200006 decay of 57Ni. 2332800200007 58Ni(n,2n)57Ni contribution was taken into account and 2332800200008 corrected by using evaluated (n,2n) cross section. 2332800200009 REL-REF (N,,M.Wagner+,B,PH-DAT,13-5,75,1990) 2332800200010 Adopted 58Ni(n,2n)57Ni cross sections given 2332800200011 DECAY-MON (27-CO-57,,DG,122.,, 2332800200012 DG,136.) 2332800200013 ERR-ANALYS (ERR-T) Quadrature sum of the following uncertainties: 2332800200014 (ERR-1) 22Na counting statistics (0.87%)2332800200015 (ERR-2) 57Co counting statistics (0.48%)2332800200016 (ERR-3) 22Na detector efficiency (1.59%)2332800200017 (ERR-4) 57Co detector efficiency (0.90%)2332800200018 (ERR-5) 57Co gamma ray emission probability (0.21%)2332800200019 (ERR-6) 23Na atoms (0.2%)2332800200020 (ERR-7) NaCl gamma-ray self-attenuation (0.3%)2332800200021 (ERR-8) Ni gamma-ray self-attenuation (0.2%)2332800200022 (ERR-9) Elastic scattering in sample (0.5%)2332800200023 (ERR-10) Nonlinear fluence decrease in NaCl (2.27%)2332800200024 (MONIT-ERR) Reference cross section including 2332800200025 57Ni correction (4.79%)2332800200026 COMMENT By author: 2332800200027 The result agrees very well with the result obtained 2332800200028 with the 511 keV annihilation radiation. 2332800200029 STATUS (TABLE) Text (p663) of 91JUELIC,p663 (1991) 2332800200030 ENDBIB 28 0 2332800200031 COMMON 11 6 2332800200032 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-6 2332800200033 ERR-7 ERR-8 ERR-9 ERR-10 MONIT-ERR 2332800200034 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2332800200035 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 2332800200036 0.87 0.48 1.59 0.90 0.21 0.2 2332800200037 0.3 0.2 0.5 2.27 4.79 2332800200038 ENDCOMMON 6 0 2332800200039 DATA 5 1 2332800200040 EN EN-ERR EN-RSL-HW DATA ERR-T 2332800200041 MEV MEV MEV MB MB 2332800200042 19.449 0.025 0.350 114.5 6.6 2332800200043 ENDDATA 3 0 2332800200044 ENDSUBENT 43 0 2332800299999 ENDENTRY 2 0 2332899999999