ENTRY 22170 20201217 22962217000000001 SUBENT 22170001 20201217 22962217000100001 BIB 16 75 2217000100002 TITLE Valence capture mechanism in resonance neutron 2217000100003 capture by 13C 2217000100004 AUTHOR (S.Raman,M.Igashira,Y.Dozono,H.Kitazawa,M.Mizumoto, 2217000100005 J.E.Lynn) 2217000100006 REFERENCE (J,PR/C,41,458,1990) main ref. 2217000100007 (C,94BOLOGN,,169,1994) full dataset (see REL-REF) 2217000100008 REL-REF (O,22381001,H.Kitazawa+,J,PR/C,46,2364,1992) Partial 2217000100009 radiative width of 24Mg, 28Si, 32S 2217000100010 (O,20873001,H.Kitazawa+,J,NP/A,575,72,1994) Partial 2217000100011 radiative width of 9Be 2217000100012 (O,22170001,S.Raman+,J,PR/C,41,458,1990) Partial 2217000100013 radiative width of 13C 2217000100014 (O,22263001,M.Igashira+,J,NP/A,536,285,1992) Partial 2217000100015 radiative width of 16O 2217000100016 INSTITUTE (2JPNJAE) S.R., M.M. 2217000100017 (2JPNTIT) M.I., Y.D., H.K. and experimental site 2217000100018 (1USAANL) J.E.L. 2217000100019 FACILITY (VDGT,2JPNTIT) 3.2 MV Pelletron accelerator at Tokyo 2217000100020 Inst. of Tech., pulsed proton beam, repetition rate 2217000100021 2 MHz, pulse width 1.5 ns and average beam 2217000100022 current 10 - 13 uA. 2217000100023 INC-SOURCE (P-LI7) 2217000100024 METHOD (TOF) 2217000100025 DETECTOR (NAICR) Capture gammas were detected by a NaI(Tl) 2217000100026 detector 7.6 cm in diam and 15.2 cm long centered in 2217000100027 an annular NaI(Tl) detector 25.4 cm in diam and 2217000100028 28.0 cm long, placed in a heavy shield of borated 2217000100029 paraffin, lead and cadmium, the whole detector being 2217000100030 operated as an anti-Compton gamma spectrometer. 2217000100031 A 6-LiH shield was added to the detector collimator 2217000100032 to absorb neutrons scattered by the sample. The sample2217000100033 detector distance was 80 cm and the gammas were 2217000100034 observed at a lab angle of 125 deg. to the proton beam2217000100035 Detector efficiency was determined experimentally 2217000100036 using several calibrated sources. 2217000100037 (SCIN) 6-Li glass scintillation detector located 40 cm 2217000100038 from the neutron source and at 30 deg. to the proton 2217000100039 beam, used to monitor neutrons incident on the sample.2217000100040 The same detector also measured the TOF spectrum at 2217000100041 the average angle of 14 deg., the relative efficiency 2217000100042 was determined from a Monte Carlo calculation. 2217000100043 SAMPLE The 13-C sample was 99% enriched carbon powder in an 2217000100044 acrylic resin container 5.8 cm in diam. and 1.1 cm 2217000100045 long. The 13-C thickness was 0.0402 atoms/b, the 2217000100046 sample being located 8.1 cm from the neutron source at2217000100047 an angle of 0 deg. 2217000100048 A gold standard sample 5.5 cm in diam and 0.17 cm long2217000100049 was used to determine the absolute number of neutrons 2217000100050 incident at the sample position. 2217000100051 MONITOR (79-AU-197(N,G)79-AU-198,,SIG) 2217000100052 MONIT-REF (,S.F.Mughabghab,3,ENDF/B-V,1379,1979) 2217000100053 ENDF/B-V data file for Li (MAT=1303) evaluated by 2217000100054 G.Hale, L.Stewart, and P.G.Young (unpublished) and 2217000100055 for 197Au (MAT=1379) evaluated by 2217000100056 S.F.Mughabghab (unpublished). 2217000100057 CORRECTION Neutron self-shielding in the sample, multiple 2217000100058 scattering in the sample, gamma absorption in the 2217000100059 sample, the dependence of the gamma detection 2217000100060 efficiency on the source position. 2217000100061 A small correction (about 3%) was made for the angular2217000100062 distribution of the 8.32 MeV E2 transition assuming no2217000100063 interference between resonance and off-resonance 2217000100064 capture. 2217000100065 Background correction from sample out measurements. 2217000100066 ERR-ANALYS (ERR-T) Total error including counting statistics and 2217000100067 contributions from errors mentioned in Subents and: 2217000100068 (ERR-1,3.,7.) Uncertainty of gamma detector efficiency,2217000100069 (ERR-2) Uncertainty of relative neutron spectrum 2217000100070 incident on sample (10%), 2217000100071 (ERR-3) Uncertainty of capture cross section of 197-Au 2217000100072 STATUS (TABLE) Table 1 from Phys.Rev.,C41(1990)458 2217000100073 HISTORY (19910218C) S.W. 2217000100074 (20160725A) SD:Updated to new date formats, lower case.2217000100075 ERR-ANALYS moved to Subents 002. 2217000100076 (20201217U) SD: Ref. added. 2217000100077 ENDBIB 75 0 2217000100078 COMMON 3 3 2217000100079 EN-RES ERR-2 ERR-3 2217000100080 KEV PER-CENT PER-CENT 2217000100081 153.0 10. 5. 2217000100082 ENDCOMMON 3 0 2217000100083 ENDSUBENT 82 0 2217000199999 SUBENT 22170002 20160725 22522217000200001 BIB 3 20 2217000200002 REACTION (6-C-13(N,G),PAR,WID,,,DERIV) 2217000200003 ANALYSIS (SHAPE) Pulse height spectrum analysis. 2217000200004 (SLA) 2217000200005 The partial off-resonance cross sections for the 2217000200006 153 keV resonance contributions in the energy bin 2217000200007 containing the 153 keV peak itself were calculated 2217000200008 using the computer code HIKARI, based on the DWBA, 2217000200009 and the results normalised to those measured and 2217000200010 deduced for the energy bin immediately below the peak.2217000200011 This enabled the total number of off-resonance counts 2217000200012 to be calculated, the difference with the total counts2217000200013 recorded in the energy bin of the resonance gave the 2217000200014 on-resonance counts, from which the resonance width 2217000200015 was deduced. 2217000200016 ERR-ANALYS (ERR-4,5.,10.) Uncertainty of extracting peak 2217000200017 area from pulse height spectrum (5-10%). 2217000200018 A straight-forward error analysis produces symmetric 2217000200019 errors; imposing the constraint that the 153 keV 2217000200020 resonance was definitely observed in the TOF spectrum 2217000200021 leads to the asymmetric errors. 2217000200022 ENDBIB 20 0 2217000200023 NOCOMMON 0 0 2217000200024 DATA 5 3 2217000200025 E-LVL-FIN E-LVL-INI DATA +ERR-T -ERR-T 2217000200026 MEV MEV MILLI-EV MILLI-EV MILLI-EV 2217000200027 0.0 8.82 34. 13. 6. 2217000200028 6.09 8.32 151. 76. 33. 2217000200029 6.73 8.32 30. 30. 13. 2217000200030 ENDDATA 5 0 2217000200031 ENDSUBENT 30 0 2217000299999 SUBENT 22170003 20160725 22522217000300001 BIB 3 8 2217000300002 REACTION (6-C-13(N,G),,WID) 2217000300003 ERR-ANALYS (ERR-4,5.,10.) Uncertainty of extracting peak 2217000300004 area from pulse height spectrum (5-10%). 2217000300005 A straight-forward error analysis produces symmetric 2217000300006 errors; imposing the constraint that the 153 keV 2217000300007 resonance was definitely observed in the TOF spectrum 2217000300008 leads to the asymmetric errors. 2217000300009 STATUS (DEP,22170002) Sum of partial widths 2217000300010 ENDBIB 8 0 2217000300011 NOCOMMON 0 0 2217000300012 DATA 3 1 2217000300013 DATA +ERR-T -ERR-T 2217000300014 MILLI-EV MILLI-EV MILLI-EV 2217000300015 215. 84. 35. 2217000300016 ENDDATA 3 0 2217000300017 ENDSUBENT 16 0 2217000399999 SUBENT 22170004 20160725 22522217000400001 BIB 2 2 2217000400002 REACTION (6-C-13(N,G)6-C-14,PAR,SIG) 2217000400003 HISTORY (20160725C) SD 2217000400004 ENDBIB 2 0 2217000400005 COMMON 1 3 2217000400006 EN-MEAN 2217000400007 KEV 2217000400008 40. 2217000400009 ENDCOMMON 3 0 2217000400010 DATA 4 4 2217000400011 E DATA ERR-T DATA-MAX 2217000400012 MEV MICRO-B MICRO-B MICRO-B 2217000400013 8.32 3.7 4.0 2217000400014 6.73 11.0 5.1 2217000400015 6.09 13.6 5.9 2217000400016 1.59 4.4 2217000400017 ENDDATA 6 0 2217000400018 ENDSUBENT 17 0 2217000499999 ENDENTRY 4 0 2217099999999