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- 152 - small conversion times also for the chosen ramp converter principle are possible. The conversion rate is 125 MHZ, i.e., for an analysis window with 1024 channels the mean converter processing time will he about 5 usee. With a laboratory model the minimum channel width is about 2.5 • 10 % of the maximum energy to be measured. Important characteristics of the converter are also the integral non-linearity (£ _+ 0.02%) and the differential non-linearity (
- 153 - homogeneity of the layers. Satisfactory results (probably accurate within 0.3%) are found for the comparison of direct weighing in vacuum and relative neutron measurements for layer thicknesses between 2 about 20 and 80 v-g/cm . These layers will be used as standards for fission cross-section measurements. Intercomparison of Fissile Layers The same equipment as used for the boron comparisons is used for the intercomparison of fissile layers. In this case the fission- and a-particle pulse-height spectra are recorded with beam-on and beam-off. The fission- and a-counting rates are deduced respectively per monitor count and per unit-time. The ratios of aand fission counting-rates can be compared. With nonhomogeneous sources they may differ. Measurements were performed on electro-sprayed uranylacetate sources and evaporated UF¿,-layers made from NBS-930 ^U-material and agreement was found within statistical errors proving their good homogeneity. Another method to compare the quality of the foils from different preparation methods is to compare the fission spectrum characteristics of foils with the same thickness in the same geometry. A particularly sensitive parameter, e.g., is the ratio Nj- / N-y of the light fragment peak counting-rate to the valley counting-rate. From these spectra also the low energy tailing can be evaluated and possible multiplication effects (at the high energy-side of the spectrum) of the surface-barrier detector used can be detected. They also enabled us to determine the limit thickness of applicability of the preparation methods to be more 2 than 500 ug/cm for electrosprayed and probably more than 1 mg/cm 2 for evaporated sources. 2200 m/s Fission Cross-Sections The boron standard foils and the evaporated ^UF.-
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PROGRESS REPORT EANDC (E) 89 ON NUC
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PROGRESS REPORT EANDC(E) 89 ON NUCL
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XVI. Gruppo di Ricerca del Contratt
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- 2 - more to a resonance with spin
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- 4 - Table I : Strength functions
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?. (n,y) ~ Spectroscopy - 6 - W. Mi
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- 8 - 62„. For "i Kerman and Shak
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- 10 - 2,k. Level Structure of Defo
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- 12 - ^* ..^^y.,Jlîli?i!giLJ.g^..
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k . Isochronous Cyclotron - 14 - i+
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4.3. Partial Cross Sections - 16 -
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- 18 - 5. New Developments in Instr
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5.2 Semiconductor Spectrometers - 2
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8-0CE-3-- lo 1-OOE-S- & &** » * *
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a-sœ-ai ¿-5Lt-(3- S-ÍEE-23- e-O
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20 30 ¿0 50 60 70 80 90 100 Neutro
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y o / • b LJ 3 J 3 2 J o . \ 10 )
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l'UU * 9 B ' G b • 4 3 0"10 •*
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9 B / o L) 4 3 2 3 B 7 6 5 4' 3 2 1
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10596 39619 3517.8 3368.6 3268.6 :
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Table I - 36 - (n,2n) Cross-Section
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- 38 - Numerical values of these fi
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Table IH - 40 - 27 Experimental cro
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- 42 - 2. Thermal Gross-Section of
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- 44 - .[1-4], the cadmium-cutoff E
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- 46 - 5. Measurement of Free Cross
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- 48 - 13,4 13,6 13,6 14,0 14,2 14,
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1,0 0,9 0,â 0,7 '/' 1,0 0,9 KO 0j9
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V 1,0 0,9 12 1.1 hO 0,9 O.d c(n,2n)
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- 55 - III. INSTITUT FUR FESTKÔRPE
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as 26 » XL 20 IB « * 12 j&[mbarn]
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- 59 - V„ PHYSICALISCHES STAATSIN
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^^"^•""-^^^^ Reaction Bn(MeV) ' -
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- 63 - VI. INSTITUT FUR REINE UND A
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- 65 - 2. Thermal-neutron capture y
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- 67 - VIII. REACTOR INSTITÜUT DEL
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- 69 - elastic scattering processes
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- 71 - hamiltonian can be handled b
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- 73 - corresponding errors by non-
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- 75 - In collaboration with the Tr
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angular distribution. - 77 - This p
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- 79 - The experimental points have
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-81 - 9. Statistical fluctuations a
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- 83 - XII.GRUPPO DI ISPRA PER LE M
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- 85 - ¿III.. LABORATORIO PATI NUC
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- 87 - the hypothesis of an inert a
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- 89 - o RL Henkel et al, Phys. Rev
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10 10 10 10 - 91 - 10 J I i I I 12
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- 93 - TABLE I : cross-section valu
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- 95 - The electronics designed for
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- 97•-, XVI. GRUPPO DI RICERCA DE
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2500- 500- - 99 - 31 E(MeV) Pig. 1
Page 107 and 108: - 101 - F. (a, Í3
Page 109 and 110: - 103 - Wheeler [9], we can express
Page 111 and 112: - 105 - [12] A. Manfredini, M. Much
Page 113 and 114: - 107 - TABLE II : Values of the pa
Page 115 and 116: 1.0 Q5 OP 10 Q5 Oy Ti 0.0k; ' L 1
Page 117 and 118: i i • î • J / i i /i K i i f i
Page 119 and 120: Use of the PDP-8 computer - 113 - A
Page 121 and 122: TABLE II : Extrapolation of the pha
Page 123 and 124: - 117 - multiplier and coincidences
Page 125 and 126: - 119 - XXI. CENTRE D»ETUDE DE L'E
Page 127 and 128: - 121 - The latter result shows a s
Page 129 and 130: - 123 - effect on the half-life of
Page 131 and 132: - 125 - standard for à'fferential
Page 133 and 134: - l¿7 - 6.4* Method for measuremen
Page 135 and 136: - 129 - XXII. Centrai Bureau for Nu
Page 137 and 138: 131 - is made. The total and the to
Page 139 and 140: 7.6 - A 1.4 1.2 1.0 0.6 0.6 0.4 02
Page 141 and 142: 300 200 100 tfinei [mb] i f I Hff^r
Page 143 and 144: 1 i 4 5 e 7 a 9 to 'it Dtttctor 1 M
Page 145 and 146: - 139 - structure at low energies w
Page 147 and 148: gr[BARN) II to • 9 - 8 - 7 - 6 -
Page 149 and 150: 143- 1000 1200 1400 1600 1800 2000
Page 151 and 152: - 145 - ment of the subthreshold fi
Page 153 and 154: - 147 - have been performed on natu
Page 155 and 156: Eo(eV) 23.22 42.28 32.13 57.11 61.8
Page 157: - 151' - Table IV 1 77 Spin assignm
Page 161 and 162: - 155 - The configuration of the IB
Page 163 and 164: - 157 - 4.2.4. Corrections for Meas
Page 165 and 166: - 159 - 4-.4-.5. Random Digital Wor
Page 167 and 168: - 161 - 5.3. Determination of Nucle
Page 169 and 170: - 163 - acid have been distributed
Page 171 and 172: - 165 - ratories in the European Co
Page 173 and 174: - 167 - MIGNECO, E., THEOBALD, J.,
Page 175 and 176: - 169 - 28. SPERNOL, A., The intern
Page 177 and 178: - 171. - XXIII. SECTION DES MESURES
Page 179 and 180: - 173 correspondantes à 8 épaisse
Page 181 and 182: - 175 - les deux utilisations pouva
Page 183 and 184: - i?7 - Pour permettre de vérifier
Page 185 and 186: - 179 - - avec une chambre d'ionisa
Page 187 and 188: - 181 - J. E. KAKSON et H. THOMAS,
Page 189 and 190: - 183 - de VYNS de 50/ug/cm ¿ d'é
Page 191 and 192: Analyse des résultats» - 185 - Fe
Page 193 and 194: - 18? - fission sont supposées sui
Page 195 and 196: - 189 - l'expérience tels que la p
Page 197 and 198: - 191 - lonner, pour différentes
Page 199 and 200: - 193 - GROUPE DES REACTIONS PHOTON
Page 201 and 202: REFERENCES : - i$5 - ( 1) C. SIGNAR
Page 203 and 204: Ni 61 tttitttttttt I (HfV) r- *i IM
Page 205 and 206: 300- 250- ?00- •0 c* A « (M Mo
Page 207 and 208: oc os ai as- 67. 01 A Mesures ( f
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t 4- S- 2- 2 g/V M i- ill I. I I »
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I°o «f eol befen normal •^B Fer
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- 207 - résonances des deux états
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REFERENCES - £09 - (1) J. MORGENST
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Meyau «tudii S, V »H» "Co "cu «
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R* -213- 19 4eV 11,8 eV Ey ; 6520 K
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- 215 - XXV. SECTIONS DE MESURAS. J
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- 217 - 2.2. .Etude, de la réactio
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- 219 - On y voit les protons de re
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- 22l - ... résonnance J = *, F =1
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Référencer : - 223 - (1) - J. Jou
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¿«J « • « » ; •»r»r r /
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•>• i 10 mtv Y / »•*«»* *?
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4?mb/si.MeV 20 15 10 h.r § z «
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Figure 1k • *%«*, = 90 '' ¡ÛE
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- 233 - XXVI. SERVICE DE' PHYSIQUE
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R E F E R E N C E S - 235 - (1) G.
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N 300 200 100 D ( r., p ) n n En=U,
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