- Fickinger, William (x)
- Measday, D. F. (x)
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Show moreThe branching ratio for the Λ weak radiative decay has been measured to be B(Λ→n+γ)/(Λ→anything) =[1.78±0.24(stat)±0.160.14(syst)]×10-3. A low-energy kaon beam was used to produce the Λ hyperons via the reaction K-+p→Λ+π0 at rest. Photons from the signal channel and π0 decay were detected with a NaI(Tl) array. The final spectrum contains 287 events after background subtraction, an order of magnitude more events than from the only previous measurement.
Phys. Rev. Lett. 69, 414–417 (1992)
http://link.aps.org/doi/10.1103/PhysRevLett.69.414
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Show moreThe photon spectrum from K- stopping in liquid hydrogen has been measured with a high-resolution (1.5% FWHM at 300 MeV) NaI(Tl) detector. The branching ratios for K-p→Λγ (Eγ=281.4 MeV) and K-p→Σ0γ (Eγ=219.5 MEV) were obtained. The results are RΛγ=(0.86±0.07-0.08+0.1)×10-3 and RΣ0γ=(1.44±0.20-0.10±0.12)×10-3 where the first error is statistical and the second systematic. These results are not in good agreement with published predictions or with previous Λγ measurements.
Phys. Rev. Lett. 63, 1352–1355 (1989)
http://link.aps.org/doi/10.1103/PhysRevLett.63.1352
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Show moreThe photon spectrum from K-d→Λnγ at rest has been measured for the first time. We obtained the branching ratio, in the end-point region, of (1.89±0.12±0.28)×10-3 where the first error is statistical and the second is systematic. We have found that the shape of the photon energy spectrum is consistent with the distribution calculated by Workman and Fearing with Λn scattering lengths and effective ranges predicted by the Nijmegen group.
Phys. Rev. C 42, R475–R478 (1990)
http://link.aps.org/doi/10.1103/PhysRevC.42.R475
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Show moreThe branching ratio for the Λ weak radiative decay Λ→nγ has been measured. Three statistically independent results from the same experiment (Brookhaven E811) are reported here. They are combined with a previously published measurement, also from Brookhaven E811, to yield a result of (Λ→nγ)/(Λ→anything)=(1.75±0.15)×10-3, based on 1800 events after background subtraction. This represents a factor of 75 increase in statistics over the previous world total. A comparison with recent theoretical papers shows that no existing model provides a completely satisfactory description of all data on weak radiative decays. A search is also reported for the radiative capture process K-p→Σ(1385)γ at rest. No signal was observed and an upper limit on the branching ratio of [K-p→Σ(1385)γ]/[K-p→anything] <4×10-4 (90% C.L.) was determined.
Phys. Rev. D 47, 799–810 (1993)
http://link.aps.org/doi/10.1103/PhysRevD.47.799
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