Summary
Semiconductor counters, which have good efficiency and energy resolution have been used to measure the branching ratio with increased precision. The measurement was made as usual by comparison of the intensity of the low-energy (<7 MeV) alphas coming directly from the212Bi with that of the high-energy (>7 MeV) alphas coming from the212Po that is produced by the β-decay of the212Bi. The average of 8 runs gaveα/(α+β)=0.358±0.001.
Riassunto
Per misurare il rapporto di branching con maggior precisione, abbiamo usato contatori a semiconduttori, che hanno buona efficienza e buona risoluzione energentica. La misura venne eseguita col metodo usuale di confrontare l’intensità delle particelleα di bassa energia (<7 MeV), provenienti direttamente dal212Bi, con quella delle particelleα di alta energia (>7 MeV), provenienti dal212Po, che si produce nel decadimento β del212Bi. La media di otto misurazioni diedeα/(α+β)=0.358±0.001.
Similar content being viewed by others
References
A. F. Kovarick andN. I. Adams:Phys. Rev.,54, 420 (1938).
F. E. Sentle, J. A. Farley andN. Lazar:Phys. Rev.,104, 1629 (1956).
P. Rice-Evans andN. J. Freeman:Proc. Roy. Soc. (London), A72, 300 (1958).
D. Prosperi andS. Sciuti:Nuovo Cimento,9, 734 (1958).
S. Barkan:Nuovo Cimento,20, 443 (1961).
G. H. Briggs:Phil. Mag.,50, 600 (1925).
M. Curie:Le Radium,4, 381 (1907).
S. Rosenblum:Ann. Phys.,10, 408 (1928).
L. Wertenstein:Compt. Rend.,151, 469 (1910).
D. Strominger, J. M. Hollander andG. T. Seaborg:Rev. Mod. Phys.,30, 585 (1958).
Author information
Authors and Affiliations
Additional information
Work performed under the auspices of the U. S. Atomic Energy Commission.
Rights and permissions
About this article
Cite this article
Barkan, S. Branching ratio of α and β emissions from212Bi (ThC). Nuovo Cim 20, 450–453 (1961). https://doi.org/10.1007/BF02731493
Received:
Published:
Issue Date:
DOI: https://doi.org/10.1007/BF02731493