Riassunto
Dopo una rassegna dei principali risultati oggi (lisponibili sulla radioattività del Potassio viene descritta una iiuova esperienza per la determinazione, del rapporto λK/λ- fra le costanti di trasformazione per cattiiraK e per emissione Β-. I raggi Β (primari) ed i raggi X (secondari alia catturaK) emessi da un sottile strato cilindrico di KF, vengono rivelati da un contatore di G. e M. coassiale collo strato. I raggi β si possono escludere dalla misura con un campo magnetioc longitudinale, i raggi X con un assorbitore mobile in foglia d’Al. Dalle differenze osservate si deduce che λK/gl- ≲ 0,1.
Summary
Recent work on the radioactivity of K40 is discussed. Then a new experimental determination of the ratio λK/λ- between the decay constants through K-capture and Β-emission is described. The Β- and X-rays (the latter resulting from the K-capture) emitted by a thin cilindrical layer of KF are counted in a coaxial G.M. counter, Β- and X-rays can be prevented from reaching the counter by the insertion of a magnetic field, respectively of an aluminium foil absorber, in the space between the counter and the KF layer. From the observed difference we deduce λK/λ-≦0,1.
Similar content being viewed by others
Bibliografia
N. R. Campbell eA. Wood:Proc. Cambr. Phil. Soc.,14, 15 (1906).
W. Kolhörster:Naturwiss.,16, 28 (1928).
A. O. Nier:Phys. Rev.,48, 283 (1935).
W. R. Smythe eA. Hemmendinger:Phys. Rev.,51, 178 (1937).
O. Klemperer:Proc. Roy. Soc,148 A, 638 (1935).
F. H. Newman eH. J. Walke:Phil. Mag.,19, 767 (1935).
K. Sitte:Zeits. f. Phys.,96, 593 (1935).
C. F. v. Weizs:ackee:Phys. Zeits.,38, 623 (1937).
C. MØller:Phys. Rev.,51, 84 (1937).
W. Bothe eA. Flammersfeld:Naturwiss.,29, 194 (1941), nota a pie’ di pagina.
P. R. Bell eJ. M. Cassidy:Phys. Rev.,79, 173 (1950).
F. C. Thompson eS. Rowlands:Nature,152, 103 (1943).
E. Bleulee eM. Gabriel:H.P.A.,20, 67 (1947).
H. A. Meyer, G. Schwachheim eM. D. Souza Santos:An. Ac. Bras.,19, 189 (1947).
O. Haxel, J. Heintze eF. G. Houtermans: comunicazione privata di F.G. Houtermans.
M. Ceccarelli, M. Merlin eA. Rostagni:Nuovo Cimento,6, 151 (1949).
S. Franchetti eM. Giovannozzi:Phys. Rev.,74, 102 (1948).
L. B. Borst eJ. J. Floyd:Phys. Rev.,74, 989 (1948).
O. Hirzel eH. WÄffler:Phys. Rev.,74, 1553 (1948).
J. J. Floyd eL. B. Borst:Phys. Rev.,75, 1106 (1949).
D. E. Alburger:Phys. Rev.,75, 1442 (1949).
P. R. Bell, B. Weaver eJ. -M. Cassidy:Phys. Rev.,77, 399 (1950).
D. E. Alburger:Phys. Rev.,78, 629 (1950).
P. R. Bell eJ. M. Cassidy:Phys. Rev.,77, 409 (1950).
R. W. Pringle, S. Standil eK. I. Roulston:Phys. Rev.,77, 841 (1950).
F. W. Spiers:Nature,165, 356 (1950).
T. Gràf:Phys. Rev.,74, 831 (1948).
W. R. Faust:Phys. Rev.,78, 626 (1950).
G. A. Sawyer eM. L. Widenbeck:Phys. Rev.,79, 490 (1950).
H. L. Ahrens eE. D. Evans:Phys. Rev.,74, 279 (1948).
G. A. Sawyer eM. L. Wiedenbeck:Phys. Rev.,76, 1535 (1949).
H. T. Richards eR, V. Smith:Phys. Rev.,74, 1870 (1948).
V. L. Sailor:Phys. Rev.,75, 1836 (1949).
P. Harteck e. H. E. Suess:Naturwiss.,74, 214 (1946).
L. T. Aldrich eA. O. Nier:Phys. Rev.,74, 876 (1948).
H. Jeffreys:Ann. de Géoph.,6, 10 (1950).
W. F. Libby eD. D. Lee:Phys. Rev.,55, 245 (1939).
A. H. Compton eS. K. Allison:X-Rays in theory and experiment (New York, 1935), p. 488.
T. Gràf:Phys. Rev.,79. 1014 (1950).
H. E. Suess:Phys. Rev.,73, 1209 (1948).
H. Jeffreys:Ann. de Gèoph.,6, 10 (1950);A. Rostagni:Geofisica pura e applicata,18, 128 (1950)
E. Gleditsch eT. Gràf:Phys. Rev. 72, 641 (1947).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Ceccarelli, M., Quareni, G. & Rostagni, A. Sulla radioattività del potassio. Nuovo Cim 8, 132–143 (1951). https://doi.org/10.1007/BF02773049
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02773049