ENTRY 21957 20190918 22822195700000001 SUBENT 21957001 20190918 22822195700100001 BIB 14 68 2195700100002 TITLE S-wave neutron strength function of Ta-181 2195700100003 REFERENCE (J,NST,20,707,1983) 2195700100004 AUTHOR (I.Tsubone, Y.Nakajima, Y.Kanda) 2195700100005 INSTITUTE (2JPNJAE) I.Tsubone, Y.Nakajima 2195700100006 (2JPNKYU) Y.Kanda 2195700100007 REL-REF (I,,Y.Nakajima,J,ANE,7,25,1980) Exp. details of 2195700100008 transmission measurements. 2195700100009 (M,,G.DeSaussure+,R,ORNL-TM-6286,1978) Code SIOB. 2195700100010 (R,,S.F.Mughabghab+,R,BNL-325,1973) Vol.1. 3rd edition.2195700100011 FACILITY (LINAC,2JPNJAE) Electron Linear Accelerator, operated 2195700100012 with 120MeV electron energy, 300pps of repetition rate,2195700100013 30 ns electron burst width, 20-30 microA average beam 2195700100014 current. 2195700100015 INC-SOURCE (PHOTO) Water cooled tantalum target . 2195700100016 Neutrons were moderated by boron-loaded polyethylene 2195700100017 disk of 20 cm diameter, 5 cm thick. 30 cm thick lead 2195700100018 shadow rings to reduce gamma-flash signals in detector.2195700100019 Neutron beam was made passed through 5 mm thick boron 2195700100020 nitride or 6 mm thick Boral plate to remove time 2195700100021 overlap neutrons for low and high resolution 2195700100022 measurement, respectively. 2195700100023 METHOD (TOF) Flight path lengths of 56.34 m (low resolution) 2195700100024 and 191.52 m (high resolution). 2195700100025 For background estimation: metallic Na was used at low2195700100026 resolution measurement, in high resolution experiment 2195700100027 the transmission of 15 mm thick U plate was measured. 2195700100028 Black resonances of Ta-181 were also used for 2195700100029 background estimation. 2195700100030 (TRN) Neutron resonance spectroscopy was performed by 2195700100031 neutron transmission measurement. 2195700100032 DETECTOR (GLASD) Li-6 glass scintillator of 11.1 cm diameter, 2195700100033 0.635 cm thick as neutron detector for low resolution.2195700100034 Detector located at 190m consisted of 5 sets of Li-6 2195700100035 glass scintillators of 11.1 cm diameter, 1.25 cm thick2195700100036 each. Neutron intensity was monitored by two Li-6 2195700100037 glass detectors at 45 and 100 m stations. 2195700100038 SAMPLE Natural Ta metallic plates. Ta-181 abundance 99.988 %.2195700100039 Contribution of Ta-180 was ignored. 2195700100040 Two samples of thickness 0.00565 and 0.0560 at/b - 2195700100041 for low resolution measurement. 2195700100042 Three samples of 0.0112, 0.0280, 0.0560 at/b - for 2195700100043 high resolution measurement. 2195700100044 ANALYSIS (SHAPE) Resonance energies and neutron widths were 2195700100045 determined for 632 levels from 100 to 3720 eV by shape 2195700100046 analysis of transmission data using least squares shape2195700100047 analysis code SIOB, based on multi-level Breit-Wigner 2195700100048 formula taking into account Doppler and resolution 2195700100049 broadenings. Capture width was assumed 55 millieV for 2195700100050 all levels - from BNL-325 3rd edition. Statistical 2195700100051 spin factors also from BNL-325, if available, 2195700100052 otherwise 0.5 was assumed. 2195700100053 Resonance parameters below 100 eV were employed from 2195700100054 BNL-325 3rd edition. 2195700100055 Average level spacing and s-wave neutron strength 2195700100056 function were deduced from these values. 2195700100057 ASSUMED (ASSUM,73-TA-181(N,G),,WID) 2195700100058 CORRECTION For counting loses by the dead time and subtraction of 2195700100059 the background - before transmission deducing. 2195700100060 HISTORY (19850208C) BL 2195700100061 (19860120A) 2195700100062 (20081230A) M.M. Misprints in reference were corrected:2195700100063 NST,707,20 -> NST,20,707 . 2195700100064 Free text was corrected to be human-readable. 2195700100065 Dates were corrected for 4-digits year . 2195700100066 BIB information was added. 2195700100067 (20190918A) SD: STATUS updated in Subents 002,003. 2195700100068 STATUS deelted from Subent 001 (Both 002 and 003 are 2195700100069 superseded by 22109. 2195700100070 ENDBIB 68 0 2195700100071 COMMON 1 3 2195700100072 ASSUM 2195700100073 MILLI-EV 2195700100074 55. 2195700100075 ENDCOMMON 3 0 2195700100076 ENDSUBENT 75 0 2195700199999 SUBENT 21957002 20190918 22822195700200001 BIB 5 16 2195700200002 REACTION (73-TA-181(N,EL),,STF) 2195700200003 ANALYSIS S-wave neutron strength function was obtained from 2195700200004 slope of plot of sum(g*WIDn0) vs neutron energy, 2195700200005 Fig.2 of Nucl.Sci.Tech.20(1983)707. 2195700200006 ERR-ANALYS (DATA-ERR) Error was estimated from conventional 2195700200007 statistical assumption deltaS0/S0 = (2/N)**0.5, where 2195700200008 N is number of levels. 2195700200009 Statistical fluctuation of resonance levels 2195700200010 is included . 2195700200011 STATUS (TABLE) text on p.709 from Nucl.Sci.Tech.20(1983)707 2195700200012 (SPSDD,22109003) 2195700200013 HISTORY (19850208C) 2195700200014 (19860120A) 2195700200015 (20081230A) EN-MIN, EN-MAX -> EN-RES-MIN, EN-RES-MAX . 2195700200016 In REACTION : (N,0) -> (N,EL) 2195700200017 (20190918A) SD: info in STATUS corrected( COREL->SPSDD)2195700200018 ENDBIB 16 0 2195700200019 NOCOMMON 0 0 2195700200020 DATA 5 2 2195700200021 EN-RES-MIN EN-RES-MAX MOMENTUM L DATA DATA-ERR 2195700200022 KEV KEV NO-DIM NO-DIM NO-DIM 2195700200023 1.00E-01 1.700 0.0 1.66E-04 1.3E-05 2195700200024 1.700 3.720 0.0 1.06E-04 9.0E-06 2195700200025 ENDDATA 4 0 2195700200026 ENDSUBENT 25 0 2195700299999 SUBENT 21957003 20190918 22822195700300001 BIB 4 8 2195700300002 REACTION (73-TA-181(N,0),,D) 2195700300003 ANALYSIS Average level spacing was obtained by the slope of the2195700300004 plot of cumulative level count up to 1700 eV , see 2195700300005 Fig. 1 of Nucl.Sci.Tech.20(1983)707. 2195700300006 STATUS (TABLE) text on p.709 from Nucl.Sci.Tech.20(1983)707 2195700300007 (SPSDD,22109004) 2195700300008 HISTORY (19860120C) 2195700300009 (20190918A) SD: info in STATUS corrected( COREL->SPSDD)2195700300010 ENDBIB 8 0 2195700300011 NOCOMMON 0 0 2195700300012 DATA 4 1 2195700300013 EN-RES-MIN EN-RES-MAX MOMENTUM L DATA 2195700300014 KEV KEV NO-DIM EV 2195700300015 1.00E-01 1.700 0.0 4.77 2195700300016 ENDDATA 3 0 2195700300017 ENDSUBENT 16 0 2195700399999 ENDENTRY 3 0 2195799999999