ENTRY 32783 20191010 31923278300000001 SUBENT 32783001 20191010 31923278300100001 BIB 12 45 3278300100002 TITLE Measurement of the cross sections of the 25Mg(n,a)22Ne 3278300100003 reaction in the 4-6 MeV region 3278300100004 AUTHOR (Yu.M.Gledenov,M.V.Sedysheva,G.Khuukhenkhuu, 3278300100005 Huaiyong Bai,Haoyu Jiang,Yi Lu,Zengqi Cui, 3278300100006 Jinxiang Chen,Guohui Zhang) 3278300100007 INSTITUTE (4ZZZDUB,3MGLNUM,3CPRBJG) 3278300100008 REFERENCE (J,PR/C,98,034605,2018) 3278300100009 #doi:10.1103/PhysRevC.98.034605 3278300100010 FACILITY (VDG,3CPRBJG) 4.5 MV Van de Graaff Accelerator 3278300100011 INC-SOURCE (D-D) The neutrons were generated using deuteron beam 3278300100012 to bombard a deuterium gas target in pressure 0.30 3278300100013 MPa, the intensity of the deuteron beam was about 2.5 3278300100014 uA and the length of the target gas cell was 2.0 cm. 3278300100015 The deuterium gas target was separated from the 3278300100016 vacuum tube of the accelerator by a molybdenum 3278300100017 membrane 5.0 um in thickness. The gas target was 3278300100018 cooled by a compressed air jet. 3278300100019 DETECTOR (IOCH) A twin-gridded ionization chamber was used as 3278300100020 the charged particle detector. The distances from 3278300100021 cathode to grid and anode to grid were 6.1 and 1.5 3278300100022 cm, respectively. The working gas Kr+CO2(2.7%) 3278300100023 pressures were 0.052 MPa for 4.0-5.0 MeV region and 3278300100024 0.068 MPa for 5.5-6.0 MeV region, respectively. 3278300100025 (BF3) A BF3 long counter located at 0 degree with 3278300100026 respect to the deuteron beam axis was used to 3278300100027 monitor the relative neutron fluence. The outer 3278300100028 radius of the BF3 long counter was 27 mm and its 3278300100029 length was 300 mm. The BF3 long counter was 3278300100030 surrounded by a moderator with radius of 350 mm and 3278300100031 length of 400 mm, and a cadmium plate 0.5 mm in 3278300100032 thickness was mounted at the front face of the 3278300100033 counter. The distance between the front face of the 3278300100034 BF3 long counter and the center of the gas target was 3278300100035 about 3.0 m. 3278300100036 SAMPLE (12-MG-25,ENR=0.986) The material of the 25Mg sample 3278300100037 is 25MgO. The sample radius was 22.0 mm. The 25Mg 3278300100038 nucleus number of forward and backward direction were 3278300100039 1.623 x E20 (+-5%) and 1.580 x E20 (+- 5%), 3278300100040 respectively. The tantalum backing layers with 0.1 mm 3278300100041 thick were faced with each other. 3278300100042 MONITOR (92-U-238(N,F),,SIG) 3278300100043 Neutron Cross-section Standards (2006) www-nds.iaea.org3278300100044 PART-DET (A) 3278300100045 STATUS (TABLE) TABLE II of Phys.Rev.C,98,034605,2018. 3278300100046 HISTORY (20191010C) Compiled by WANG Jimin (CNDC). 3278300100047 ENDBIB 45 0 3278300100048 NOCOMMON 0 0 3278300100049 ENDSUBENT 48 0 3278300199999 SUBENT 32783002 20191010 31923278300200001 BIB 2 16 3278300200002 REACTION (12-MG-25(N,A)10-NE-22,,SIG) 3278300200003 ERR-ANALYS (ERR-T) The total uncertainty, 7.4-20.8%. 3278300200004 (ERR-1) The number of the 238U nuclei 0.5% 3278300200005 (ERR-2,3.5,3.6) The number of the 25Mg nuclei 3278300200006 (ERR-3,2.3,5.8) The ratio of the count of the BF3 3278300200007 long counter during the measurement of the 238U 3278300200008 sample over that during the measurement of the 3278300200009 25MgO samples. 3278300200010 (ERR-4,5.9,12.9,U) The detected counts of alpha events.3278300200011 (ERR-5,0.5,0.6,U) The detected counts of fission 3278300200012 events. 3278300200013 (ERR-6,1.0,1.1) The detection efficiency of fission 3278300200014 events. 3278300200015 (ERR-7,0.5,14.7) The detection efficiency of alpha 3278300200016 events. 3278300200017 (MONIT-ERR,0.7,0.9) 238U(n,f) cross sections. 3278300200018 ENDBIB 16 0 3278300200019 COMMON 1 3 3278300200020 ERR-1 3278300200021 PER-CENT 3278300200022 0.5 3278300200023 ENDCOMMON 3 0 3278300200024 DATA 4 5 3278300200025 EN EN-RSL-HW DATA ERR-T 3278300200026 MEV MEV MB MB 3278300200027 4.0 0.2 22.32 3.03 3278300200028 4.5 0.2 26.71 2.62 3278300200029 5.0 0.1 29.31 6.09 3278300200030 5.5 0.1 37.47 2.79 3278300200031 6.0 0.1 39.46 3.18 3278300200032 ENDDATA 7 0 3278300200033 ENDSUBENT 32 0 3278300299999 SUBENT 32783003 20191010 31923278300300001 BIB 2 16 3278300300002 REACTION (12-MG-25(N,A)10-NE-22,PAR,SIG) 3278300300003 ERR-ANALYS (ERR-T) The total uncertainty, 7.1-17.8%. 3278300300004 (ERR-1) The number of the 238U nuclei 0.5% 3278300300005 (ERR-2,3.5,3.6) The number of the 25Mg nuclei 3278300300006 (ERR-3,2.3,5.8) The ratio of the count of the BF3 3278300300007 long counter during the measurement of the 238U 3278300300008 sample over that during the measurement of the 3278300300009 25MgO samples. 3278300300010 (ERR-4,5.5,9.5,U) The detected counts of alpha events. 3278300300011 (ERR-5,0.5,0.6,U) The detected counts of fission 3278300300012 events. 3278300300013 (ERR-6,1.0,1.1) The detection efficiency of fission 3278300300014 events. 3278300300015 (ERR-7,0.5,14.7) The detection efficiency of alpha 3278300300016 events. 3278300300017 (MONIT-ERR,0.7,0.9) 238U(n,f) cross sections. 3278300300018 ENDBIB 16 0 3278300300019 COMMON 2 3 3278300300020 E-LVL ERR-1 3278300300021 KEV PER-CENT 3278300300022 0.0 0.5 3278300300023 ENDCOMMON 3 0 3278300300024 DATA 4 5 3278300300025 EN EN-RSL-HW DATA ERR-T 3278300300026 MEV MEV MB MB 3278300300027 4.0 0.2 5.82 0.86 3278300300028 4.5 0.2 9.37 1.06 3278300300029 5.0 0.1 12.35 2.19 3278300300030 5.5 0.1 10.53 0.75 3278300300031 6.0 0.1 13.78 1.24 3278300300032 ENDDATA 7 0 3278300300033 ENDSUBENT 32 0 3278300399999 ENDENTRY 3 0 3278399999999