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- 70 - not running, the activity was limited to build a new collimator in order to have a collimated thermal neutron without y and fast neutron background. A Bi single crystal randomly oriented will be used to filtre the neutron beam. 2.4. (n,n'y) directional correlation measurements on Mg and Si During the year 1967, a first collection of experimental data on directional correlations (n,n f Y) has been completed. The targets utilized were natural magnesium and silicon, the incident neutrons beam was obtained by the d(d,n)3 He reaction at deuterons energy of 390 KeV. The measurements have been interrupted for about four months in order to replace the accelerating coluner and high voltage stabilizer of PN Van de Graaff. A computer program based on "Montecarlo" method is being developed in order to elaborate the experimental data. 2.5. Development of techniques for the elaboration of experimental data with computers A Montecarlo program for the detector efficiency calculation of high energy (0*15 MeV gamma-rays in Nal(Tl) scintillators has been studied. Such a program allows efficiency calcula tions for cylindrical detectors and for ellipsoidal sources, out of the detector axis. Our results have been compared with both experimental measurements and calculations of previous authors. A report is being prepared. Moreover a computer program to analyse complex gamma-ray spectra has been studied. The method permits automatic identification of peaks of high resolution spectra in the presence of back ground, provided that the data are stored in a way suitable for computer input (i.e. on magnetic or paper tape). The program reads the entire spectrum, locates the peaks and determines their amplitudes, centroids and widths with their
- 71 - hamiltonian can be handled by employing shell model wave functions without giving rise to spurious effects deriving from the motion of the center of mass (11). The method provides an approach to the study of very light nuclei alternative to the usual variational method. An application of the method to the calculation of the 1~ levels of £:vjo Pb in Tamm-Dancoff approximation has been per formed. It has been found that in the usual calculations the spuriosity can have very large effects on transition probabilities but very small effects on the eigenvalues. The method provides indeed eigenfunctions which are practical^ ly free from spuriosity. References [i] P. Oliva and D. Prosperi - Nuovo Cimento 49 (1967) B 161. [~2l D. Prosperi and S. Sciuti: Ricerche di Pisica dei nuclei con raggi quasi monocromatici. Relazione su invito presen- tata al 52° congresso della SIF, Trieste Ottobre 1966 - DOC/SEFIN (1962) 10. j"3l M. Giannini, P. Oliva, D. Prosperi and S. Sciuti - Nuovo Cimento 34 (1964) 344. [4] M. Giannini, P. Oliva, D. Prosperi and S. Sciuti - <strong>Nuclear</strong> Physics §2 (1965) 344. I5I M. Giannini, P. Oliva, D. Prosperi and G. Toumbev - <strong>Nuclear</strong> Phys. A 101 (1967) 145.
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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
Page 26 and 27: 5.2 Semiconductor Spectrometers - 2
Page 28 and 29: 8-0CE-3-- lo 1-OOE-S- & &** » * *
Page 30 and 31: 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: - 69 - elastic scattering processes
Page 79 and 80: - 73 - corresponding errors by non-
Page 81 and 82: - 75 - In collaboration with the Tr
Page 83 and 84: angular distribution. - 77 - This p
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
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- 121 - The latter result shows a s
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- 123 - effect on the half-life of
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- 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
Page 213 and 214:
- 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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