Branching Ratio for Pion-beta Decay: [pi]+ --> [pi]0 + [epsilon]+ + [gamma]
Author : Robert Bruce Bacastow
Publisher :
Page : 62 pages
File Size : 11,65 MB
Release : 1963
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ISBN :
Author : Robert Bruce Bacastow
Publisher :
Page : 62 pages
File Size : 11,65 MB
Release : 1963
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Author : David F. Bartlett
Publisher :
Page : 116 pages
File Size : 18,64 MB
Release : 1964
Category : Beta rays
ISBN :
The conserved vector current theory predicts that the branching ratio for the decay of a charged pion into a neutral pion is (1.05=0.02)x10 to the -8th power, if the coupling constant is derived from muon decay, or (1.00=0.02)x10 to the -8th power, if the coupling constant is derived from nuclear beta decay. Using spark chambers to distinguish the nearly anticollinear gamma rays from pi(+) beta decay from a background of other gamma rays, we have found 36 events and have measured the branching ratio to be (0.97=0.20)x10 to the -8th power, in agreement with the theoretical prediction and previous measurements. The method of background subtraction (approximately 10%) depends only on knowing that the background is isotropic for gamma rays having opening angles between 160 degrees and 180 degrees. (Author).
Author : Francois Charles Gaille
Publisher :
Page : 560 pages
File Size : 46,45 MB
Release : 1982
Category : Branching ratios (Nuclear physics)
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Author : Robert B. Bacastow
Publisher :
Page : 50 pages
File Size : 23,29 MB
Release : 1963
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Author : Edward Alan Wadlinger
Publisher :
Page : 474 pages
File Size : 24,77 MB
Release : 1973
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Author : Alan Strelzoff
Publisher :
Page : 66 pages
File Size : 27,3 MB
Release : 1964
Category : Branching ratios (Nuclear physics)
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The ratio of the pion decay rates for the processes, pi yields e + nu and pi yields mu + nu was measured. A large NaI (tl) crystal was used to separate the high energy pion decay electrons from the continuous spectrum of the pi-mu-e chain. Counting decay electrons immediately following a pion stop, the ratio by a direct comparison of pi-e and pi-mu-e electrons was determined. From an observed 10,891 pi-e electrons a precision of 1.8% was attained in the guantity (pion lifetime x branching ratio). Considering the present uncertainty in the pion lifetime the branching ratio, (1.247 = 0.028) x 10 to the -4 power is obtained. This is in good agreement with the theoretical value, 1.233 x 10 to the -4 power, required by the V-A theory when radiative corrections are included. (Author).
Author : Kétévi Adiklè Assamagan
Publisher :
Page : 500 pages
File Size : 16,87 MB
Release : 1995
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Author : WILLIAM KEITH BERTRAM
Publisher :
Page : 57 pages
File Size : 20,53 MB
Release : 1965
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Author :
Publisher :
Page : 934 pages
File Size : 18,64 MB
Release : 1976
Category : Nuclear energy
ISBN :
Author : Masataka Fukugita
Publisher : Springer Science & Business Media
Page : 599 pages
File Size : 31,48 MB
Release : 2013-06-29
Category : Science
ISBN : 3662051192
This useful text provides a survey of the current state of research into the physics of neutrinos. It gives a global view of the areas of physics in which neutrinos play important roles, including astrophysics and cosmology.