ee 
Thermal Photons in designated ( \ev) 
(n,y) energy intervals 
cross Spec- per 100 captures 
section tral 
Target (barns) type O-1 1-3 3-6 5-7 7 
Aluminum 0.215 1 13 >13 vi 21 35 
Antimony 6.4 3* ? ~80 36 12 
Arsenic 4.1 3* 2? ~80 47 = 22 1 
Barium Liz 3* 2? ~80 75 14 1 
Beryllium tt 0.009 1 0 0 50 75 0 
Bismuth tt 015 1 0 0 100 0 0 
Boron-10$ 3,990 4 0 0 0 0 0 
Cadmium 3,500 38* >120 20 73 17 1 
Calcium 0.406 2 ? 50 60 101 2 
Carbon-12 0.0045 1 ? <30 100 0 0 
Chlorine 32 2 ? 20 13 18 21 
Chromium 2.9 1* >37 146 12 18 69 
Cobalt 34.8 2* ? i 36 49 8 
Copper 3.59 1* 2 >23 22 42 
Fluorine 0.009 1 a? ? 2 35 0 
Gadolinium 36,300 3* ? 80 23 4 2 
ie) 94 3* ? ig 66 38 0 
Hydrogen-1tt 0.330 1 0 100 0 0 0 
Indium 190 3* ? ? 36 4 0 
Iron 2.43 ie ? <10 24 22 50 
Lead+t 0.17 1 0 O° Tay % 93 
Lithium-6 910 4 0 0 0 0 0 
Magnesium 0.059 2 ? >59 110 25 1 
Manganese 12.6 2* ? ? >27 30 27 
Mercury 380 3* ? ? 86 41 0 
Molybdenum 2.4 3* ? ? 84 26 3 
Nickel 4.8 1 ? ? >14 30 72 
Niobium eal 3* 2 ? 5414 0 
Nitrogen-14 0.1 2 ? <5 <35 90 39 
Phosphorous 0.193 2 ? ? 115 843 phil 
Platinum Sou 3* 2? ~120 45 = 15 1 
Potassium 1.89 2 ? 36 6360 ©=«632 12 
Praseodymium 11.2 3* 2? ~80 34 8 0 
Rhodium 150 3* ? ~70 38 10 0 
Samarium 10,600 3* ? ~150 45 5 1 
Scandium 22 3* ? ? 63 29 14 
Selenium 11.8 3* ? ? 65 27 11 
Silicon 0.160 2 ? >100 229 41 16 
Silver 60 3* t= 90) 707 17 0. 
Sodium 0.47 2 =100 >50 61 29 0 
Strontium 1.16 (2-3)* ? ~140 62 49 13 
Sulfur 0.49 2 ? >19 80 91 8 
Tantalum 21.3 3* ~50 26 2 0 
Thallium 3.3 3* 2? ~100 76 62 0 
Tin 0.65 3* ? ? 139 =. 333 4 
Titanium 5.8 2* >50 100 33 99 10 
Tungsten 19.2 3* ig ie 53 14.5 0. 
Vanadium-51 4.7 3* 4 ? 24 54 18 
Zinc 1.06 (2-3)* ? ig 48 29 17 
Zirconium** 0.18 3* ? ? 113.35 4 
Average Fraction 
Highest number of energy 
energy 0. emitted S(Em) 
gamma- photons/ (10)T 
ray capture ——_——_—_—__———-_ Reefeer- 
(Mev) (24) Em (Mev) S(Em) ences Decay gammast4 
7.724 ~2 2.5 0.78 (2) 2.3-min Al?s; 
100(1.80) 
6.80 (18) Complicated 
7.30 2.7 (18) Complicated, 
uncertain 
9.23 (14) 
6.814 (9) 
4.17 (1) 
0.478 (26) Fast B18: 94 
(0.478) 
9.046 4.1 (6, 14, 17, 
20-23, 28, 
29) 
7.83 2.6 0.80 (3, 16) 
4.95 1.3 3.68 0.93 (8, 9) 
8.56 3.1 3.3 0.26 (8, 16, 21, 
22, 28, 29, 
31) 
9.716 >2 2.8 0.73 (4, 16, 27) 
7.486 2.5 0.67 (6,7, 21, 5.3-y Co®: 
22, 27) 100(1.17), 100(1.33) 
7.914 2.6 3.4 0.67 (4,7; 27) 
6.63 (4) 12-sec F209; 
100(1.63) 
7.78 3.9 (14) 
6.494 3.5 (13, 17) 
2.230 (26, 30) 
5.86 3.3 (13) 54.3-min In!16:; 18 
(2.09), 15(1.49), 
54(1.27), 39(1.09) 
10.16 ee 3.0 0.78 (4, 27, 33) 
7.38 (1) 
0 (26) 
9.216 2.6 0.99 (2, 11, 16) 9.58-min Mg??: 
10(0.84), 2(1.01) 
7.261 2.6 3.5 0.64 (5,7, 19, 2.59-hr Mn‘: 
27, 32) 100(0.845), 25 
(1.81), 15(2.13) 
6.446 3.3 (14) 
9.15 (14) 
8.997 3.4 0.95 (4) 
7.19 2.6 (13) 
10.8 (8) 
7.94 2.5 0.66 (3) 
7.920 (14) Complicated 
9.28 3.00 0.48 (3, 12, 16) 
5.83 (13) 19-hr Pr!42: 4(1.58) 
6.792 (18) Exist (34) 
7.89 5.6 (14) 
8.85 (6, 7) 85-d Sc46: 100 
(1.12), 100(0.89) 
10.483 (14) 
10.55 2.5 1.44 (2, 16) 
Wiied: 2.9 (18) Complicated 270- 
day Ago 
6.41 <2 (2, 15, 17) 14.9-hr Na*4: 100 
(2.758), 100(1.380) 
9.22 (14) 
8.64 2.7 0.76 (3) 
6.07 (18) Complicated 
6.54 (18) 
9.35 (14) 
9.39 2.4 1.02 (4, 16, 18, 
7.42 (14) 
7.305 2.5 2.6 0.82 (6, 7, 27) 3.74-min V8: 
100(1.46) 
9.51 2.8 0.60 (4) 250-d Zn®: 25 
(1.12) 
8.66 (14) 65-d Zr: ~98 
(0.750). 35-d Nb%: 
100 (0.764) 
* For elements thus marked, number of unresolved photons has been determined; for all others only the intensity of resolved lines 
is given. 
} Fraction, S, of available energy emitted by gamma rays with energy greater than Em. Em is the minimum gamma-ray energy observed 
in the measurement, it has no deep significance. : 
} ‘‘Complicated”” means decay gammas above 750 kev are claimed to exist but the multiplicity of isotopes and/or the complexity of 
the decay schemes render estimations of intensities difficult. 
See reference (33) for data. 
{| Notation for decay gamma rays is as follows: half-life of decay-gamma emitter is given first, then number of decay gamma rays of 
each energy >750 kev per 100 neutron captures. 
Energy is in parentheses. 
emits 10 0.84-Mev and 2 1.01-Mev decay gamma rays per 100 captures. 
§ Boron-10 decay gamma is from Li? following alpha decay of B1. 
** Capture-gamma-ray intensities for zirconium may be off by 50%. 
Thus “‘9.58-min Mg??: 10 (0.84), 2 (1.01)”” means isotope 
tt For these elements, the highest-energy gamma ray is the only gamma ray present in the highest occupied energy interval. For lead, 
in addition, the seven 5-7-Mev gamma rays are all 6.73 Mev; for beryllium, in addition, the fifty 3-5-Mev gammas are all 3.37 Mev. 
SS 
203 
