ENTRY 14544 20211109 148914544 0 1 SUBENT 14544001 20211107 148914544 1 1 BIB 8 39 14544 1 2 TITLE Search for high energy gamma-rays from the 14544 1 3 spontaneous fission of 252Cf 14544 1 4 AUTHOR (S.J.Luke,C.A.Gossett,R.Vandenbosch) 14544 1 5 INSTITUTE (1USAWAU) 14544 1 6 REFERENCE (J,PR/C,44,1548,1991) 14544 1 7 #doi:10.1103/PhysRevC.44.1548 14544 1 8 (P,A-WAU-1990,7,1990) Preliminary result 14544 1 9 #NSR: 1990GOZW 14544 1 10 (J,BAP,36,1348(J10-2),1991) 14544 1 11 #NSR: 1991LUZX Abstract, no data 14544 1 12 INC-SOURCE The source had isotopically pure 252Cf 14544 1 13 electrodeposited on a platinum disk. The Cf source 14544 1 14 was placed in the center of a scattering chamber at a 14544 1 15 distance of 1.2 cm from a silicon surface barrier 14544 1 16 detector. 14544 1 17 DETECTOR (SIBAR) The silicon detectors were collimated to 14544 1 18 yield a half angle of between 22 degrees and 38 14544 1 19 degrees, depending on the size of the detector. 14544 1 20 Several of these detectors were used in the course of 14544 1 21 the measurement; the detectors lasted two to three 14544 1 22 days before they be came severely radiation damaged. 14544 1 23 (NAICR) A 25.4 cm x 38.1 cm NaI detector (50 cm away 14544 1 24 from the source) surrounded by a passive lead shield 14544 1 25 and an active anticoincidence shield to minimize the 14544 1 26 cosmic-ray background. The NaI detector was calibrated 14544 1 27 up to a gamma-ray energy of 30 MeV using low energy 14544 1 28 sources and gamma rays from 11B(p,gamma) at Ep = 7.25 14544 1 29 and 14.3 MeV. 14544 1 30 The solid-state detector was placed at an angle of 120 14544 1 31 degrees with respect to the axis of the NaI detector. 14544 1 32 The time of flight between events in the 14544 1 33 fission-fragment detector and in the NaI detector was 14544 1 34 recorded. The gate in the time-difference spectrum was 14544 1 35 narrow enough to allow the discrimination against 14544 1 36 neutrons of 25 MeV or less. 14544 1 37 METHOD (COINC) Measurement in the fission-fragment/gamma ray 14544 1 38 coincidence mode 14544 1 39 HISTORY (20190625C) OG. 14544 1 40 (20211107A) OG. The 1-st ref. replaced, Sub002 updated.14544 1 41 ENDBIB 39 0 14544 1 42 NOCOMMON 0 0 14544 1 43 ENDSUBENT 42 0 14544 199999 SUBENT 14544002 20210826 148914544 2 1 BIB 4 6 14544 2 2 REACTION (98-CF-252(0,F)0-G-0,PR,FY/DE) 14544 2 3 ERR-ANALYS (DATA-ERR) No information on source of uncertainty. 14544 2 4 STATUS (CURVE) Fig.4 (p.1551) in Phys.Rev/C,44,1548,1991 was 14544 2 5 digitized by GSYS2.4.7. 14544 2 6 HISTORY (20211107A) OG. Preliminary data replaced by final 14544 2 7 results from Phys.Rev/C,44,1548,1991. 14544 2 8 ENDBIB 6 0 14544 2 9 NOCOMMON 0 0 14544 2 10 DATA 3 14 14544 2 11 E DATA DATA-ERR 14544 2 12 MEV PT/FIS/MEV PT/FIS/MEV 14544 2 13 5.320 7.330E-03 14544 2 14 6.475 4.289E-03 14544 2 15 7.644 5.888E-04 14544 2 16 8.811 1.012E-04 14544 2 17 9.990 3.907E-05 14544 2 18 11.147 1.953E-05 2.322E-06 14544 2 19 12.321 1.251E-05 1.486E-06 14544 2 20 13.458 6.045E-06 14544 2 21 14.715 2.672E-06 3.863E-07 14544 2 22 15.970 1.445E-06 3.043E-07 14544 2 23 17.212 4.214E-07 1.691E-07 14544 2 24 18.467 2.131E-07 1.210E-07 14544 2 25 19.700 1.428E-07 9.988E-08 14544 2 26 20.995 7.469E-08 7.023E-08 14544 2 27 ENDDATA 16 0 14544 2 28 ENDSUBENT 27 0 14544 299999 ENDENTRY 2 0 1454499999999