THE DECAY ENERGY OF Bi$sup 205$. Technical Note No. 8

Technical Report · Mon Sep 25 04:00:00 EDT 1961

OSTI ID:4840837

Bonacalza, E C.O.; Thieberger, P; Bergstroem, I

The decay energy of Bi/sup 205/ was determined by measuring the K and L x rays which follow electron capture and feed the 2567 kev and 2610 kev levels. In this way the K to L, K to total and L to total capture ratios were found. Comparing these values with theoretical predictions, a total decay energy of 2703 plus or minus 6 kev was established. This corresponds to a neutrino energy of 46 kev for K-capture to the 2567 kev level. Since this value disagreed with the previously determined maximum positron energy feeding the 703 kev level, the positron spectrum was remeasured and a value of 976 plus or minus 10 kev was found. This yields a total decay energy of 2701 plus or minus 10 kev, in good agreement with the capture value. K and L x rays feeding the 1766 kev level were measured as a check of the method since, for such a large spacing, the ratios are rather insensitive to energy variations. The log ft values for the E.C. decay to the 2567 kev and 2610 kev levels were calculated yielding values of 6.60 plus or minus 0.05 and 6.34 plus or minus 0.06 respectively. (auth)

• Research Organization: Sweden. Kungliga Tekniska Hogskolan, Stockholm; Sweden. Kungliga Vetenskapsakademien. Nobelinstitutet for Fyski, Stockholm
• NSA Number: NSA-16-018469
• OSTI ID: 4840837
• Report Number(s): AFOSR-1566; AD-266647
• Country of Publication: United States
• Language: English

Related Subjects

BISMUTH 205
CAPTURE
DECAY
ELECTRONS
ENERGY
ENERGY LEVELS
LIFETIME
MEASURED VALUES
PHYSICS
POSITRONS
SPECTRA
X RADIATION