ENTRY 30992 20090919 31423099200000001 SUBENT 30992001 20090919 31423099200100001 BIB 13 41 3099200100002 TITLE The (n,2n) cross section for Na-23 3099200100003 between En = 13.3 - 18.5MeV 3099200100004 AUTHOR (Xu Zhizheng,Pan Limin,Wu Zhihua) 3099200100005 INSTITUTE (3CPRFUD) 3099200100006 REFERENCE (J,CNST,2,(3),153,199108) 3099200100007 (C,91JUELIC,,666,199105) Same results as 3099200100008 Nucl.Sci.Techn.(Shanghai) 2,153 (1991) 3099200100009 FACILITY (VDG) 3099200100010 SAMPLE Natural NaF powder pressed into cylinders 1 cm thick 3099200100011 and 2 cm in diameter. 3099200100012 INC-SOURCE (D-T) Neutrons were produced by bombarding a 3099200100013 2.65 mg/cm2 thick T-Ti target, mounted on a 3099200100014 thin (0.1 mm) copper tube, with 2.3 MeV deuterons. 3099200100015 Nine samples, suspended on a ring of 70 mm in radius, 3099200100016 were irradiated simultaneously at different angles 3099200100017 with respect to the deuteron beam. 3099200100018 METHOD (ACTIV,COINC) The induced specific activity was deter- 3099200100019 mined by gamma-gamma coincidence spectrometry. 3099200100020 DETECTOR (COIN,NAICR,NAICR) Two NaI(Tl) crystal detectors used 3099200100021 in gamma-gamma coincidence measurement. 3099200100022 CORRECTION Corrections were made for neutron flux attenuation 3099200100023 within the sample, self-absorption in the sample, 3099200100024 accidental coincidences. 3099200100025 ERR-ANALYS (ERR-T) The experimental errors in the cross sections 3099200100026 were calculated by compounding quadratically the 3099200100027 uncertainties of: 3099200100028 (ERR-1) Sample position 1.5% 3099200100029 (ERR-2) Neutron flux measurement 6% 3099200100030 (ERR-3) Neutron attenuation correction 5% 3099200100031 (ERR-4) Gamma coincidence counting efficiency 5% 3099200100032 (ERR-5) Neutron angular distribution calculation 2% 3099200100033 (ERR-6,,0.01) Mass of sample <0.01% 3099200100034 (ERR-S) Statistical errors of counting 7% 3099200100035 STATUS (TABLE) Data are taken from Table 1 of Conf. on Nucl. 3099200100036 Data for Sci. and Technol., Juelich 1991, page 666. 3099200100037 HISTORY (19920724C) HW 3099200100038 (19930825U) HW.-Reference added and free text under 3099200100039 'Detector' and 'Correction' altered in subent 001.- 3099200100040 (20090912A) SD:Updated to new date formats,lower case. 3099200100041 Cosmetic changes, Common section and codes for 3099200100042 Err-analys were added. Code for Facility was changed. 3099200100043 ENDBIB 41 0 3099200100044 COMMON 6 3 3099200100045 ERR-1 ERR-2 ERR-3 ERR-4 ERR-5 ERR-S 3099200100046 PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT PER-CENT 3099200100047 1.5 6. 5. 5. 2. 7. 3099200100048 ENDCOMMON 3 0 3099200100049 ENDSUBENT 48 0 3099200199999 SUBENT 30992002 20090919 31423099200200001 BIB 2 2 3099200200002 REACTION (11-NA-23(N,2N)11-NA-22,,SIG) 3099200200003 DECAY-DATA (11-NA-22,,AR) 3099200200004 ENDBIB 2 0 3099200200005 NOCOMMON 0 0 3099200200006 DATA 4 6 3099200200007 EN EN-ERR DATA ERR-T 3099200200008 MEV MEV MB MB 3099200200009 18.5 0.27 185. 33. 3099200200010 18.1 0.23 171.2 20. 3099200200011 17.5 0.4 157.7 20. 3099200200012 16.4 0.5 136.5 20. 3099200200013 14.9 0.5 70. 19. 3099200200014 13.3 0.4 1.9 2. 3099200200015 ENDDATA 8 0 3099200200016 ENDSUBENT 15 0 3099200299999 ENDENTRY 2 0 3099299999999