13 research outputs found
Traité des falsifications et altérations des substances alimentaires et des boissons, par E. Burcker,...
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SEARCH FOR NARROW STATES IN THE INCLUSIVE GAMMA-RAY SPECTRA RESULTING FROM ANTIPROTON ANNIHILATIONS AT REST IN LIQUID-HYDROGEN AND DEUTERIUM
The energy spectrum of gamma-rays produced in proton-antiproton
annihilation at rest in hydrogen and deuterium has been measured with
good energy resolution and high statistics. The data were taken using
the PS183 magnetic pair spectrometer at CERN’s Low Energy Antiproton
Ring. A detailed search of the gamma-spectrum yielded no evidence of
gamma-transitions to narrow states with widths consistent with the
spectrometer resolution. In hydrogen, upper limits (95% C.L.) are
obtained for the yield of narrow states of (2-5) x 10(-4) for states
below 1700 MeV/c2, and (5-10) x 10(-4) for states between 1700 and 1800
MeV/c2. In deuterium, the corresponding upper limits are (1-7) x 10(-3)
for masses between 700 and 1730 MeV/c2, and (1-2) x 10(-3) for masses
between 1750 and 1835 MeV/c2. These results contradict reports of the
observation of narrow lines made by previous experiments