37AR 36AR(N,G) E=THERMAL: {~EGAF} 37AR c Evaluated Gamma-ray Activation File (EGAF). 37AR2c Evaluated by R.B. Firestone (LBNL), December 2003. 37AR c BR$|s{-0}=5.2 5 (1981MuZQ) 37AR cG RI$Elemental |s(|g) assuming %Abundance=0.3365 30 37AR N 297 3 37AR PN C 37AR2PN Thermal cross section in barns. 37AR cN NR$Isotopic |s(|g)=NR*RI. 37AR2cN Divide by |s{-0} for intensity per neutron capture. 37AR L 0.0 3/2+ 35.04 D 4 37AR L 1409.8 9 1/2+ 660 FS 140 37AR G 1409.710 0.006012 37AR L 1611.27 7/2- 4.37 NS 9 37AR G 1611.23 0.0006024 S 37AR L 2490.7 73/2- 560 FS 100 37AR G 879.3 0.0006012 S 37AR G 2490.8 8 0.008822 37AR L 3518.5 123/2- 38 FS 20 37AR G 1027.7 0.0013 4 S 37AR G 2108.015 0.003910 37AR L 8789.9 9 1/2+ 37AR G 5270.612 0.003710 37AR G 6298.910 0.007619 37AR G 7380.320 0.0003612 37AR G 8787.720 0.0021 6 37AR 36AR(N,G) E=THERMAL: ^L^A^N^L 1968WI25,1970HA56,1990EN08 37AR c For the capture of thermal neutrons by Ar-36 (which 37ARAc captures about 2.9% of the thermal neutrons captured by natural 37ARBc argon), I adopted the average of the intensities reported by Hardell 37ARCc and Beer (1970) [1970Ha56] and by Wille (1968) [1968Wi25]. For Hardell 37ARDc et al. (1970), I converted their reported intensities, which were 37AREc normalized to capture by Ar-40, up by a factor of 34.5 to convert to 37ARFc capture by Ar-36. Hardell et al. (1970) only reported seven gamma 37ARGc rays, one of which was not seen by Wille (1968). Thus the other 21 37ARHc gamma rays are based only on the results of Wille (1968). 37AR c For the gamma-ray energies, I adopted those based on the 37ARAc level energies of Endt (1990) [1990En08]. For the three gamma rays not 37ARBc assigned levels (1957, 2087, and 4212 keV), I adopted the energies 37ARCc measured by Wille (1968). (These gamma rays were not observed by 37ARDc Hardell et al. 1970.) 37AR c The energies are probably good to a keV or better as most 37ARAc of the level energies are reported to be good to ~0.5 keV or better. 37ARBc The quoted uncertainties for the intensities are ~15% or more. As the 37ARCc two sets of intensities for the stronger gamma rays often differ by up 37ARDc to ~50%, I suspect that the adopted intensities are only good to ~20% 37AREc for the stronger gamma rays and possibly larger uncertainties for the 37ARFc weaker gamma rays. The total energy, the sum from the capture state, 37ARGc and the sum into the ground state are about 90%, thus the data are 37ARHc fairly complete. The sums of gamma rays into and from the various 37ARIc levels are fairly consistent. 37AR N 1.0 37AR PN C 37AR2PN Per 100 neutron captures. 37AR G 1957.30 2.000 37AR G 2087.30 0.300 37AR G 4211.60 0.800 37AR L 0.0 3/2+ 37AR L 1409.82 1/2+ 37AR G 1409.80 30.300 37AR L 1611.27 7/2- 37AR G 1611.24 3.400 37AR L 2217.10 7/2+ 37AR L 2490.60 3/2- 37AR G 879.31 0.500 37AR G 2490.51 47.475 37AR L 2796.10 5/2+ 37AR L 3171.30 5/2+ 37AR L 3185.10 9/2- 37AR L 3273.90 5/2- 37AR L 3518.30 3/2- 37AR G 1027.67 2.700 37AR G 2108.41 20.130 37AR L 3527.20 7/2- 37AR L 3602.00 3/2+ 37AR L 3706.50 11/2- 37AR L 3936.70 3/2+ 37AR G 3936.49 1.000 37AR L 3979.80 37AR G 3979.59 1.300 37AR L 4021.40 9/2- 37AR L 4283.30 7/2- 37AR L 4396.40 5/2- 37AR L 4443.50 1/2- 37AR L 4573.10 5/2+ 37AR L 4624.10 7/2+ 37AR L 4634.30 3/2- 37AR G 2143.65 0.200 37AR G 3224.35 1.000 37AR L 4743.20 7/2+ 37AR L 4798.50 5/2+ 37AR L 4886.70 37AR L 4980.80 37AR L 5048.30 5/2- 37AR L 5089.80 1/2- 37AR G 2599.11 3.100 37AR G 3679.78 7.900 37AR L 5101.70 5/2+ 37AR L 5129.80 5/2+ 37AR L 5213.40 11/2+ 37AR L 5346.40 3/2- 37AR L 5407.80 3/2- 37AR L 5435.50 37AR L 5793.40 13/2- 37AR L 6150.70 13/2+ 37AR L 6473.50 15/2+ 37AR L 6583.00 37AR G 2139.39 0.200 37AR L 6822.00 (3/2+) 37AR G 2248.82 2.000 37AR L 7071.40 37AR L 8788.90 37AR G 1966.84 2.000 37AR G 2205.85 2.700 37AR G 3698.91 13.400 37AR G 4154.34 1.800 37AR G 4345.10 3.200 37AR G 4808.78 1.600 37AR G 4851.86 0.800 37AR G 5270.23 20.608 37AR G 6297.75 35.310 37AR G 7378.29 1.380 37AR G 8790.80 9.935