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- 1-4-0 - = 100 meV below a = 0.6 and with = 27 meV for a-value s higher than 1.0 i"9l. ?40 Subthreshold Fission Cross Section of Pu [10] The subthreshold neutron induced fission cross section 24-0 of Pu has been measured with the fission neutron detector in the energy range between 200 eV and 9 keV. The resonance parameters have been determined with an area analysis program. The fission spectrum obtained shows a periodical appearance of clusters of resonances with particularly high fission widths (Fig. 6). This result is of special interest in relation to the theory of Strutinsky who introduces shell effects into nuclear deformation energies (Nucí. Phys. A95 (1967) 420-4-42). 235 Fission Cross Section of U The measurement of this fission cross section is being prepared with a spark chamber as fragmentand the liquid scintillator as neutron-detector. The spark chamber detector for fission fragment detection of highly a-active fissile isotopes consists of six wire-to-plate chambers (20 x 20 cm ). Nitrogen circulates at a pressure of 250 Torr. .^-Measurement and Determination of Neutron Multicrplicities The mechanical construction of a large liquid scintillator tank is ready. The realisation of a heavy shield for this detector is continuing. 235 Normalization of Relative "^U Fission Cross-Sections in the Resonance Region A.J. Deruytter (CBNM), C. Vagemans* These measurements are carried out at the CBNM linac by a joint CBNM-SCK-team with the view to extend the x Belgian research fellow NFVO (University of Gent)
gr[BARN) II to • 9 - 8 - 7 - 6 - 5- 4 - 3 - 2 - m WMWiM'^^ 500 750 , u 1000 1250 1500 1750 2000 Fig.6 Subthreshold fission cross section of neutron induced fission of 240 Pu ••ty^/vAA^A/í'v^-'SA-v' _l_ 2750 E(EV) i i
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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
Page 95 and 96: - 89 - o RL Henkel et al, Phys. Rev
Page 97 and 98: 10 10 10 10 - 91 - 10 J I i I I 12
Page 99 and 100: - 93 - TABLE I : cross-section valu
Page 101 and 102: - 95 - The electronics designed for
Page 103 and 104: - 97•-, XVI. GRUPPO DI RICERCA DE
Page 105 and 106: 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: - 139 - structure at low energies w
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 and 158: - 151' - Table IV 1 77 Spin assignm
Page 159 and 160: - 153 - homogeneity of the layers.
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
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- 191 - lonner, pour différentes
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- 193 - GROUPE DES REACTIONS PHOTON
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REFERENCES : - i$5 - ( 1) C. SIGNAR
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Ni 61 tttitttttttt I (HfV) r- *i IM
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300- 250- ?00- •0 c* A « (M Mo
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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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