ENTRY 23229 20140401 22382322900000001 SUBENT 23229001 20140401 22382322900100001 BIB 11 46 2322900100002 TITLE The cross section of the 12C(n,alpha0)9Be reaction in 2322900100003 the 7.5-9.6 MeV energy range 2322900100004 AUTHOR (G.Giorginis, V.Khryachkov, V.Corcalciuc, M.Kievets) 2322900100005 INSTITUTE (2ZZZGEL,4RUSFEI,3RUMBUC) 2322900100006 REFERENCE (W,GIORGINIS,20140401) 2322900100007 FACILITY (VDG,2ZZZGEL) 7 MV Van de Graaff 2322900100008 DETECTOR (IOCH,IOCH) Two ionisation chambers: one Frisch- 2322900100009 gridded for the forward detection of products (alpha 2322900100010 and 9Be) with signal digitisation of the anode and 2322900100011 cathode signals, the other without grid for backward 2322900100012 detection of U(n,f) fission fragments. 2322900100013 Gas mixture of krypton Kr(95%)CH4(5%) was used as 2322900100014 detector medium. 2322900100015 Forward IOCH: 2322900100016 Diameter of electrodes = 18 cm, 2322900100017 Cathode-to-anode distance = 41 mm, 2322900100018 Grid-to-anode distance = 4 mm. 2322900100019 Backward IOCH: 2322900100020 Cathode-to-monitor anode distance = 1 mm. 2322900100021 (FISCH) 238U standard (533 ug/cm2 thick, 2.54 cm diam.)2322900100022 mounted on the cathode. 2322900100023 SAMPLE Detector medium in ionization chamber 2322900100024 [3 bar Kr(95%)CH4(5%)] was used as carbon target. 2322900100025 A novel neutron beam profiling technique and time 2322900100026 information from the digitised signals were used for 2322900100027 the accurate determination of the target volume. 2322900100028 PART-DET (A,FF) 2322900100029 ERR-ANALYS (ERR-T) Total uncertainty (Quadrature sum, table)2322900100030 (ERR-SYS) Total systematic uncertainty (table)2322900100031 [1] Systematic uncertainty in number of carbon-12 2322900100032 - radii of surfaces of truncated cone (1.1%) 2322900100033 - height of gas volume (1%) 2322900100034 - pressure of detector gas (0.1%) 2322900100035 - temperature of detector gas (0.3%) 2322900100036 - content of CH4 as certified by producer (2%) 2322900100037 [2] Systematic uncertainty in number of events 2322900100038 - Background (12C recoils) supr. 7.5-7.8 MeV (30%) 2322900100039 - Background (12C recoils) supr. 7.875-8.35 MeV(10%) 2322900100040 - Background suppression above 8.35 MeV (1.2%) 2322900100041 - Neutron background from source materials (1.5%) 2322900100042 - Number of U-238 nuclei (<0.7%) 2322900100043 - Low energy monitor events by extrapolation (<1.5%) 2322900100044 (ERR-S) Statistics for (n,a) and monitor (table) 2322900100045 STATUS (TABLE) Unpublished 2322900100046 (PRELM) Preliminary data (G.Giorginis, 2014-03-30) 2322900100047 HISTORY (20140330C) Compiled by Georgios Giorginis 2322900100048 ENDBIB 46 0 2322900100049 COMMON 1 3 2322900100050 E-LVL 2322900100051 MEV 2322900100052 0. 2322900100053 ENDCOMMON 3 0 2322900100054 ENDSUBENT 53 0 2322900199999 SUBENT 23229002 20140401 22382322900200001 BIB 1 1 2322900200002 REACTION ((6-C-12(N,A)4-BE-9,PAR,SIG)/(92-U-238(N,F),,SIG)) 2322900200003 ENDBIB 1 0 2322900200004 NOCOMMON 0 0 2322900200005 DATA 6 30 2322900200006 EN EN-RSL-FW DATA ERR-S ERR-SYS ERR-T 2322900200007 MEV KEV NO-DIM NO-DIM NO-DIM NO-DIM 2322900200008 7.500 97. 0.01459 0.00149 0.00438 0.00463 2322900200009 7.650 95. 0.03435 0.00103 0.01030 0.01036 2322900200010 7.800 93. 0.05312 0.00212 0.01594 0.01608 2322900200011 7.875 92. 0.09691 0.00490 0.00969 0.01086 2322900200012 7.950 91. 0.13051 0.00472 0.01305 0.01388 2322900200013 8.000 90. 0.14844 0.00787 0.01484 0.01680 2322900200014 8.100 89. 0.14142 0.00699 0.01414 0.01578 2322900200015 8.170 88. 0.11770 0.00190 0.01177 0.01192 2322900200016 8.240 88. 0.10586 0.00227 0.01059 0.01083 2322900200017 8.350 86. 0.07338 0.00444 0.00734 0.00857 2322900200018 8.425 85. 0.06890 0.00125 0.00246 0.00276 2322900200019 8.460 85. 0.06358 0.00077 0.00227 0.00240 2322900200020 8.500 84. 0.07679 0.00395 0.00274 0.00481 2322900200021 8.575 84. 0.06580 0.00406 0.00235 0.00469 2322900200022 8.650 82. 0.07066 0.00334 0.00252 0.00419 2322900200023 8.725 82. 0.07197 0.00441 0.00257 0.00511 2322900200024 8.800 81. 0.08529 0.00517 0.00304 0.00600 2322900200025 8.900 80. 0.10334 0.00499 0.00369 0.00621 2322900200026 8.950 79. 0.11953 0.00648 0.00427 0.00775 2322900200027 9.000 79. 0.12441 0.00622 0.00444 0.00764 2322900200028 9.075 79. 0.15217 0.00698 0.00543 0.00884 2322900200029 9.150 78. 0.18214 0.00638 0.00650 0.00911 2322900200030 9.225 77. 0.21493 0.00766 0.00767 0.01084 2322900200031 9.300 77. 0.24262 0.01141 0.00866 0.01432 2322900200032 9.350 74. 0.24373 0.00952 0.00870 0.01290 2322900200033 9.400 74. 0.24885 0.01162 0.00888 0.01462 2322900200034 9.450 72. 0.20904 0.00681 0.00746 0.01010 2322900200035 9.500 72. 0.18134 0.00863 0.00647 0.01079 2322900200036 9.550 72. 0.16858 0.00762 0.00602 0.00971 2322900200037 9.600 72. 0.14952 0.00742 0.00534 0.00914 2322900200038 ENDDATA 32 0 2322900200039 ENDSUBENT 38 0 2322900299999 SUBENT 23229003 20140401 22382322900300001 BIB 4 4 2322900300002 REACTION (6-C-12(N,A)4-BE-9,PAR,SIG) 2322900300003 MONITOR (92-U-238(N,F),,SIG) 2322900300004 MONIT-REF (,,3,ENDF/B-VI.8,,2001) 2322900300005 STATUS (DEP,23229002) 12C(n,a)9Be/238U(n,f) ratio 2322900300006 ENDBIB 4 0 2322900300007 NOCOMMON 0 0 2322900300008 DATA 6 30 2322900300009 EN EN-RSL-FW DATA ERR-S ERR-SYS ERR-T 2322900300010 MEV KEV B B B B 2322900300011 7.500 97. 0.01417 0.00145 0.00425 0.00449 2322900300012 7.650 95. 0.03352 0.00101 0.01006 0.01011 2322900300013 7.800 93. 0.05208 0.00208 0.01562 0.01576 2322900300014 7.875 92. 0.09518 0.00481 0.00952 0.01066 2322900300015 7.950 91. 0.12839 0.00464 0.01284 0.01365 2322900300016 8.000 90. 0.14616 0.00775 0.01462 0.01655 2322900300017 8.100 89. 0.13939 0.00689 0.01394 0.01555 2322900300018 8.170 88. 0.11609 0.00188 0.01161 0.01176 2322900300019 8.240 88. 0.10448 0.00224 0.01045 0.01069 2322900300020 8.350 86. 0.07249 0.00438 0.00725 0.00847 2322900300021 8.425 85. 0.06808 0.00124 0.00243 0.00273 2322900300022 8.460 85. 0.06285 0.00076 0.00224 0.00237 2322900300023 8.500 84. 0.07591 0.00390 0.00271 0.00475 2322900300024 8.575 84. 0.06492 0.00400 0.00232 0.00463 2322900300025 8.650 82. 0.06971 0.00330 0.00249 0.00413 2322900300026 8.725 82. 0.07099 0.00435 0.00253 0.00504 2322900300027 8.800 81. 0.08413 0.00510 0.00300 0.00592 2322900300028 8.900 80. 0.10191 0.00492 0.00364 0.00612 2322900300029 8.950 79. 0.11786 0.00639 0.00421 0.00765 2322900300030 9.000 79. 0.12265 0.00613 0.00438 0.00753 2322900300031 9.075 79. 0.14991 0.00688 0.00535 0.00871 2322900300032 9.150 78. 0.17931 0.00628 0.00640 0.00897 2322900300033 9.225 77. 0.21144 0.00754 0.00755 0.01067 2322900300034 9.300 77. 0.23851 0.01122 0.00851 0.01408 2322900300035 9.350 74. 0.23951 0.00936 0.00855 0.01267 2322900300036 9.400 74. 0.24439 0.01141 0.00872 0.01436 2322900300037 9.450 72. 0.20524 0.00669 0.00733 0.00992 2322900300038 9.500 72. 0.17797 0.00847 0.00635 0.01059 2322900300039 9.550 72. 0.16538 0.00747 0.00590 0.00952 2322900300040 9.600 72. 0.14662 0.00727 0.00523 0.00896 2322900300041 ENDDATA 32 0 2322900300042 ENDSUBENT 41 0 2322900399999 ENDENTRY 3 0 2322999999999