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- 76 - made with visual techniques. It is however noticeable that the 1 ^0(n,a) 1 3Q reaction at the same energy, studied with counter techniques, gives, for the angular distributions, re sults quite in disagreement with ours. For the first levels the angular distributions show, in fact, forward asymmetry. The results will soon be published. The results on the 20 1 ^ Ne(n,2o) C reaction have been published in "Nuovo Cimento" [5]- Ericson's fluctuations Following a first work where we analysed the method of the maxima counting to determine the correlation width, we have extended the research to include the effect of the finite energy resolution. We have then calculated the bias introduced by various types of experimental resolution (rectangular, Gaussian, Lorentzian) and presented the coefficients to be used in the different experimental situations to obtain r by means of the maxima counting. We have also made a compa rison of the influence of the finite resolution on the various methods to determine r . The results have been presented to LUI S.I.F. Meeting and are in the press f?"]. Montecarlo calculations on the "Blocking" effects in single crystals It is known that the angular distribution emitted from a latti ce centre of a single crystal shows narrow minima in the direc tion of main crystal strings. According to a suggestion by Tulinov, this "blocking" effect of lattice strings could be exploited to measure the lifetime of highly excited nuclear states produces in nuclear reactions. In fact, the depth of minimum is expected to decrease with in creasing distance of the emission point from the lattice centre, so that the average recoil distance could be deduced from the
angular distribution. - 77 - This possibility has been investigated by means of detailed numerical calculations with a "Montecarlo" method, using the IBM 7090 of CNUCE. The model is based on Feldman's approxi mations on the atomic scattering in a crystal, and takes the thermal vibration into account. According to preliminary re sults [presented at S.I.F. 53th Meeting, Oct. 1967], the me thod should be sensitive to lifetimes of the lO"" 1 ? order. References [l] P. Blasi, M. Bocciolini, P.R. Maurenzig, P. Sona - Nuovo Cimento Serie X J50B (1967) 298. [~2J M. Bocciolini, A.Cambi, T.F. Fazzini, P.R. Maurenzig - Nuovo Cimento Serie X 52B (1967) 229. [3] P. Blasi, M. Bocciolini, P. Sona - LIII S.I.F. Meeting Bologna 1967. [4] P. Blasi, P.R. Maurenzig, R.A. Ricci, N. Taccetti, R. Giacomich, M. Lagonegro, G. Poiani - Nuovo Cimento Serie X 51B (1967) 241 . [5] S. Petralia, G. Di Caporiacco, M.. Mandó, G. Parrini - Nuo vo Cimento 44 (1966) 225-228. [6] P.G. Bizzeti and P.R. Maurenzig - Il Nuovo Cimento Serie X 47B (1967) 29. p7] P.G. Bizzeti and P.R. Maurenzig - LUI S.I.F. Meeting - Bologna 1967 - To be published in "Il Nuovo Cimento".
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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
Page 32 and 33: 20 30 ¿0 50 60 70 80 90 100 Neutro
Page 34 and 35: y o / • b LJ 3 J 3 2 J o . \ 10 )
Page 36 and 37: l'UU * 9 B ' G b • 4 3 0"10 •*
Page 38 and 39: 9 B / o L) 4 3 2 3 B 7 6 5 4' 3 2 1
Page 40 and 41: 10596 39619 3517.8 3368.6 3268.6 :
Page 42 and 43: Table I - 36 - (n,2n) Cross-Section
Page 44 and 45: - 38 - Numerical values of these fi
Page 46 and 47: Table IH - 40 - 27 Experimental cro
Page 48 and 49: - 42 - 2. Thermal Gross-Section of
Page 50 and 51: - 44 - .[1-4], the cadmium-cutoff E
Page 52 and 53: - 46 - 5. Measurement of Free Cross
Page 54: - 48 - 13,4 13,6 13,6 14,0 14,2 14,
Page 57 and 58: 1,0 0,9 0,â 0,7 '/' 1,0 0,9 KO 0j9
Page 59 and 60: V 1,0 0,9 12 1.1 hO 0,9 O.d c(n,2n)
Page 61 and 62: - 55 - III. INSTITUT FUR FESTKÔRPE
Page 63 and 64: as 26 » XL 20 IB « * 12 j&[mbarn]
Page 65 and 66: - 59 - V„ PHYSICALISCHES STAATSIN
Page 67 and 68: ^^"^•""-^^^^ Reaction Bn(MeV) ' -
Page 69 and 70: - 63 - VI. INSTITUT FUR REINE UND A
Page 71 and 72: - 65 - 2. Thermal-neutron capture y
Page 73 and 74: - 67 - VIII. REACTOR INSTITÜUT DEL
Page 75 and 76: - 69 - elastic scattering processes
Page 77 and 78: - 71 - hamiltonian can be handled b
Page 79 and 80: - 73 - corresponding errors by non-
Page 81: - 75 - In collaboration with the Tr
Page 85 and 86: - 79 - The experimental points have
Page 87 and 88: -81 - 9. Statistical fluctuations a
Page 89 and 90: - 83 - XII.GRUPPO DI ISPRA PER LE M
Page 91 and 92: - 85 - ¿III.. LABORATORIO PATI NUC
Page 93 and 94: - 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
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- l¿7 - 6.4* Method for measuremen
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- 129 - XXII. Centrai Bureau for Nu
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131 - is made. The total and the to
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7.6 - A 1.4 1.2 1.0 0.6 0.6 0.4 02
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300 200 100 tfinei [mb] i f I Hff^r
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1 i 4 5 e 7 a 9 to 'it Dtttctor 1 M
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- 139 - structure at low energies w
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gr[BARN) II to • 9 - 8 - 7 - 6 -
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143- 1000 1200 1400 1600 1800 2000
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- 145 - ment of the subthreshold fi
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- 147 - have been performed on natu
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Eo(eV) 23.22 42.28 32.13 57.11 61.8
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- 151' - Table IV 1 77 Spin assignm
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- 153 - homogeneity of the layers.
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- 155 - The configuration of the IB
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- 157 - 4.2.4. Corrections for Meas
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- 159 - 4-.4-.5. Random Digital Wor
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- 161 - 5.3. Determination of Nucle
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- 163 - acid have been distributed
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- 165 - ratories in the European Co
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- 167 - MIGNECO, E., THEOBALD, J.,
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- 169 - 28. SPERNOL, A., The intern
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- 171. - XXIII. SECTION DES MESURES
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- 173 correspondantes à 8 épaisse
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- 175 - les deux utilisations pouva
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- i?7 - Pour permettre de vérifier
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- 179 - - avec une chambre d'ionisa
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- 181 - J. E. KAKSON et H. THOMAS,
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- 183 - de VYNS de 50/ug/cm ¿ d'é
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Analyse des résultats» - 185 - Fe
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- 18? - fission sont supposées sui
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- 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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