ENTRY 22953 20230518 231722953 0 1 SUBENT 22953001 20230518 231722953 1 1 BIB 14 66 22953 1 2 TITLE A detection system for (n,n') reaction studies of 22953 1 3 astrophysical interest. 22953 1 4 AUTHOR (M.Segawa,Y.Temma,Y.Nagai,T.Masaki,T.Shima,T.Ohta, 22953 1 5 A.Nakayoshi,J.Nishiyama,M.Igashira) 22953 1 6 REFERENCE (J,NIM/A,564,370,2006) Main Reference. 22953 1 7 (J,JPJ,74,2981,2005) Method to prepare Li-7 targets. 22953 1 8 REL-REF (M,,A.Tomyo+,J,AJ,623,L153,2005) Details of detector 22953 1 9 efficiency correction 22953 1 10 INSTITUTE (2JPNOSA) M.Segawa, Y.Temma, Y.Nagai, T.Masaki, 22953 1 11 T.Shima, T.Ohta, A.Nakayoshi 22953 1 12 (2JPNTIT) J.Nishiyama, M.Igashira 22953 1 13 FACILITY (VDGT,2JPNTIT) The 3.2 MV Pelletron accelerator of the 22953 1 14 Research Laboratory for Nuclear Reactors at the Tokyo 22953 1 15 Institute of Technology. 22953 1 16 INC-SOURCE (P-LI7) Li-7(p,n)Be-7 reaction. The proton energy was 22953 1 17 adjusted so as to produce neutrons between 10 and 22953 1 18 80 keV. Metallic layers of natural Li, evaporated onto22953 1 19 copper disk, thickness 0.4 mm cooled by water. Average22953 1 20 beam current of 5 microA at repetition rate 2 MHz. 22953 1 21 INC-SPECT Low-energy neutrons 22953 1 22 DETECTOR (GLASD) Four 6-Li glass detectors of 50 mm diameter and22953 1 23 10 mm thickness. Energy resolution 20%, defined by 22953 1 24 measured energy spectrum of scattered neutron by gold 22953 1 25 sample. Time resolution 1.5 nsec (FWHM) obtained from 22953 1 26 TOF spectrum using gamma-ray from LI-7(p,gamma)Be-8 22953 1 27 reaction. Detectors were surrounded by neutron shield 22953 1 28 composed of boron-doped polyethylene blocks with 22953 1 29 tapered collimator. Detector was set at 90deg. to 22953 1 30 proton beam direction. 22953 1 31 Li-6-glass detector of 5mm diameter and 5mm thickness 22953 1 32 for monitoring of incident neutron energy spectrum. 22953 1 33 Placed at 0deg. to proton beam direction,30cm downward22953 1 34 from neutron production target. 22953 1 35 SAMPLE Os-186 metallic powder of 0.34g weight and 99.55% 22953 1 36 enrichment in Os-186. Gold sample of 0.19 g weight. 22953 1 37 Sample was placed 2cm downward from Li-7 neutron 22953 1 38 production target. Os,Au,C samples were wrapped by 22953 1 39 aramid sheet of 4 microm thickness. 22953 1 40 METHOD (TOF) Neutron production target - sample distance =2cm.22953 1 41 25/20 cm distance from sample to detectors. 22953 1 42 TOF spectrums were measured 1)without sample, 22953 1 43 2) with and without adding 0.4mm thick copper disk on 22953 1 44 existing copper backing (0.4mm), 22953 1 45 3) for water and air cooling for copper backing. 22953 1 46 (SITA) Measurement was carried out cyclically by 22953 1 47 changing four samples of Os-186, Au, C and blank 22953 1 48 position. 22953 1 49 ANALYSIS (REDUC) Constant background subtracted from TOF 22953 1 50 spectrum for Os,C and blank samples were obtained. 22953 1 51 TOF spectrum for blank sample was subtracted from 22953 1 52 that for Os and C to obtain net TOF spectrum, which 22953 1 53 was used to define neutron energy spectrum for 22953 1 54 osmium and carbon. 22953 1 55 CORRECTION Correction factors at EN 20.-40. keV Energy: 22953 1 56 for multiple-scattering effects of incident neutrons 22953 1 57 in Au sample - 1.00, 22953 1 58 in Os-186 sample - 1.01, 22953 1 59 in C sample - 1.01, 22953 1 60 for shielding of incident neutrons 22953 1 61 in Au sample - 0.98, 22953 1 62 in Os-186 sample - 0.96, 22953 1 63 in C sample - 0.95. 22953 1 64 HISTORY (20070123C) M.M. 22953 1 65 (20170825A) SD: Subent 002 deleted (Raw data, not 22953 1 66 for EXFOR compilation) 22953 1 67 (20230518A) SD: Correction in Subent 003. 22953 1 68 ENDBIB 66 0 22953 1 69 NOCOMMON 0 0 22953 1 70 ENDSUBENT 69 0 22953 199999 NOSUBENT 22953002 20170825 226522953 2 1 SUBENT 22953003 20230518 231722953 3 1 BIB 4 8 22953 3 2 REACTION (79-AU-197(N,EL)79-AU-197,,SIG) 22953 3 3 ERR-ANALYS (ERR-T) Presented uncertainty around 5.% 22953 3 4 (ERR-S) Statistical error of yield. 22953 3 5 (ERR-1) Uncertainty of elastic scattering cross 22953 3 6 section for carbon. 22953 3 7 STATUS (TABLE) Values presented on p.376 and on Fig.8 of 22953 3 8 Nucl.Instr.Meth.,A564(2006)370 22953 3 9 HISTORY (20230518A) SD: ERR-T deleted from COMMON section. 22953 3 10 ENDBIB 8 0 22953 3 11 COMMON 2 3 22953 3 12 ERR-S ERR-1 22953 3 13 PER-CENT PER-CENT 22953 3 14 3. 4. 22953 3 15 ENDCOMMON 3 0 22953 3 16 DATA 3 3 22953 3 17 EN DATA ERR-T 22953 3 18 KEV B B 22953 3 19 21.5 12.9 0.7 22953 3 20 39.0 11.9 0.6 22953 3 21 58.8 10.7 0.5 22953 3 22 ENDDATA 5 0 22953 3 23 ENDSUBENT 22 0 22953 399999 ENDENTRY 3 0 2295399999999