, NEUTRON AND NUCLEAR DATA REVISED FOR THE 1997/98HANDBOOK OF CHEMISTRY AND PHYSICS* NE Holden' 1. Reactor Division, Brookhaven National Laboratory CEIVED 3UN 2 5 m7 O ST I The 1997/98 Handbook of Chemistry and physics will contain revised nuclear data information dealing with scattering and absorption properties of neutrons*. All of these nuclear data were recently reevaluated. The 2200 meter per second neutron cross sections and the neutron resonance integrals evaluation was performed in conjunction with the 1997 KAPL Wall-Chart of the Nuclides* to insure consistency in the recommended values in the Handbook and on the Chart. The 2200 meters per second neutron cross sections presented in the Handbook correspond to room temperaaue neutrons, 20.43O C, or a thermal neutron energy of 0.0253 electron volts, (ev). There is no distinction made for measurements in a thermal maxwellian spectrum or a reactor spectrum. These alternatives are presented when they are the only information available. Values are normally given for the neutron capture reaction (n,g), although in cases where they are energetically possible, charged particle cross sections for (n,p), (n,t), @,a) reactions and neutron fission cross sections (n,f) are also provided. Neutron resonance integxals are defined over the energy range from 0.5 ev up to 0.1 x lo6ev (or 0.1 MeV). They are averaged over a flux spectrum with a 1/E shape. Evaluated experimental data are derived from either a direct measurement or from 1/E spectrum averaged resonance parameter idomation. Resonance integrals are presented for neutron capture, charged particle or neutron fission reactions. Thermal neutron scattering is used for the investigation of the static and dynamic properties of condensed matter and it requires a knowledge of neutron scattering lengths. The Handbook presents bound atom neutron coherent scattering lengths in units of fentometers (loi3an). Stellar slow neutron capture processes occur in a thermal neutron spectrum with temperatures approximately 30 kev. 30 kev maxwellian averaged neutron cross sections for astrophysical applications are a new parameter presented in the 78th edition of the Handbook. No new parameters will be added to the Table of Isotopes' nuclear information but revised values will be provided for parameters of all known nuclides of the 112 chemical elements. These will appear in the 1998/99edition, when it is hoped that the heavy element names for elements Z= 104 to Z= 109 will be confirmed by IUPAC.
MEUTRON SCAlTERING AND ABSORPTION PROPERTIES Bern. Natural Abundance or Isot. ' (5%) 99.985(1) 0.015( I) Thermal Neut. Half-life 12.32~ Coh. Scat. Resonance Cross Section hgral 0.3320) 0.149( 1) 0.332(2) 0.51(l)mb < 6. pb 0.149(1) 0.23(2) mb Length (fm) up=5.33(l)xl(r 0.05(1) mb = loo. - 3.741(1) 6.671(4) 4.79(3) "N "'Nd lund '"Nd &(I) pb* - 1.90(2) 8.8(4) mb 3.9(2) mb 7.79(1) 53.28 d up=3.9(1)x10' Rs=1.75(5)~10' 1.52~106y a, 0.1 8.8(4) mb < 1. mb 3.9(2) mb 7.79(1) 7.6(1)xlOZ 34345) 5.30(4) 0,=38.4(1)xlff 0.3(1) up=7-(1)mb u,=8.(2) mb 5.(3) mb RI,,=17.3(1)~1V 0.13(4) 2(1) mb 6.65(4) 3.5(1) mb 6.646(1) 3.5(1) mb 1.4(1) mb <1. pb 1.6(1) mb 1.6(1) mb 1.7(2) mb 6.651(2) 6.19(9) 1.9( 1) 0.85(5) 9.36(2) up=1.830 0.080(1) 0.04(1) mb R$=0.82(3) 0.034( 1) 0.11(3) mb 9.37(2) 0.29( 1) mb 0.40(4) mb 0.19(1) mb ua=0.24(1) 0.54(7) mb 0.16(1) mb 0.36(4) mb 0.11( 1) 0.39(5) mb 0.81(4) mb 5.805(5) 5.8(2) 34(4) pb a, 3.9(5) mb' 5.84(7) 7.2(6) pb* 51.(2) 4945) 7.69(5) 19.(1) 330.(1O),u,=l7.mb 3.6(3) 47.(6),ua=12.pb 34.(11) 128.(30) 3.9(5) 260. (40) 7.7(3) J 80.1(2) 5715. y 99.634(9) 0.20(1) 27.2(5) 12.2(2) 23.8(3) 8.30(1) 3.26(3) - 2.22(2) 99.76( 1) 0.04 "Ud R$=2.39(1)xl(r 5.74(7) &=422.(4) 17.Q) mb 2042) mb 0.366(9) a d 3.26(3) u,=9.4(1)x102 39.(5) mb 4545) mb 19.9(2) 98.89( 1) 1.11(1) 0.25(2) mb' 32.(1) 92.5(2) "J3 71.(2) 7.5(2) 100. u(30ke.v) Maxw. Avg. - 3.739(1) < 0.05 1.37~10" - (* Extrapla& Value) y 2.1~10'~ 2.0(1) 39(6) pb up 16(4)* - 0.1(3) 6.44(3) 2.8(3) 16(1) pb* 0.2(1) mb 1.5(4) pb' a, 1.8(2) rnb' 0.040 mb 4.9(5) pb' 4644)mb 0.24( 1) 0.11(1) 0.49( IO)
NEUTRON SCA-G Natural Elem. or Isot. Abundance IaNd 17.2(3) land W d 5.7(1) 5.6(2) 'Cud (%I Half-life 10.98 d AND ABSORPTION PROPERTIES Thermal Neut. Cross Section ResoMnce Coh. Scat. @am) (fm) Inregd 1S(2) 440.(150) 2.4(1) 1.O( 1) - (* Extrapolated Value) Length. u(3okev) Maxw. Avg. 3.0(4) 200. 13.(2) 14.(2) 8.7(2) 0.16(4) 5.7(3) 5.3(2) 0.19(4) (1OOO. +1280.) 12.6(4) 6 l h '*h 5.53 y 2.6234 y 41.3 d 5.37 d 2.212 d 1.183 d u7pm 'SIPm 5.6(1)xl@ &m *"Sm "'Sm lffsm 'Tim %m U9Sm %m u2sm *Sm '%m 61Eu aleu 3.080 14.99(17) 11.24(10) 13.820 7.38(1) 26.74(14) 22.75(27) '%I weu '%Eu 52.19(6) 'acid wgd 0.20(1) 2.18(3) 14.80(12) '%d 20.47(9) "'Gd 15.65(2) %d 24.84(7) '%I 21.86(19) 9.30 h 13.5 y 8.59 y 4.76 y 241.6 d USGd 16YGd 2.6(2.4)x103 1.4(2)x103 2.4(3) 1.6(1) 280.(20) 600.(90) 710.(50) 1. 0 6 ~ 1 0y ~ ~56.(4).uo=0.6mb 27.(14) 7x1OUy 2.4(6) IO" y 40100.(600),uo=31.mb 3100.(500) 290.(30) 102.Q 15200.(300) 90.Y 3000.(300) 206.(15) 1.929d 420.(180). 733) 32.(6) 6 4 a '52Gd ' 340.d 47.81(6) L-EU 1sLEU 8.4(1.7)~103 (84. +96.) 1O600.(800) = 103 1400.(200) = 150. 14.(3) 3520.(60) - 5.0(6) 4570.( 100) (4. +3150. +6OOO.) ~,,=8.7(3)pb 68000.(15000) 11000.(2000) 300.(2O),ua< 1.pb 1500.(300) 3900.(200) 3.80~103 (2000. +4OOO.) < 100000. 16004200) 1800.(W) 1600.(200) 16000.(2000) 8.2(1) 48.8(6)x1@ 400.(10) 9.5(2) 5.3(3) (0.06+60.) z2.0 2.54(3)xlW,u,,<0.05 2.3(3) 1.50 2.O(6)x1O4 230.(50) 154O.(100) 104.(15) 800.(100) 7347) 641) 0.97( 1) 241.(2)mb 1.82(2) 422. (4)mb 47344)mb 442) 3.2(3) 4.4(7) 1. o s 0 700.(200),uo<7.mb 700.(200) 20000.(10000),~,,=0.03 61.(1)x10',u,,=.08mb 3.66 m 14.(3) 6.3(4) 942) 9.15(5) 0.88(3) 2.72(9) 0.64(6) 1.36(4) 0.22(2) References 1. Holden, NE; Neutron Scattering and Absorption Properties, BNL-64131, Brookhaven National Laboratory (March 1997). 2. Parrington, JR; Knox, HD; Breneman, SL; Baum, EM; Feiner, F; Chart of the Nuclides, 15" Edition, Knolls Atomic Power Laboratory (Oct. 1996). 'Research was carried out under the auspices of the US Department of Energy (Contract DE-AC0276CHOOO16)
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