Evidence for the Production of Neutral Mesons by Photons

Steinberger, J.; Panofsky, Wolfgang K. H.; Steller, Jack.

doi:10.1103/physrev.78.802

Cited by 86 publications

(29 citation statements)

References 11 publications

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“…Using the first bremsstrahlung facilities, pioneering results for γp → π 0 p [1], γp → π + n [2], and γn → π − p [3] were obtained. Despite all the shortcomings of the first measure-ments (such as large normalization uncertainties, wide energy and angular binning, limited angular coverage, etc.…”

Section: Introductionmentioning

confidence: 99%

Measurement ofπ0photoproduction on the proton at MAMI C

Adlarson¹,

Afzal²,

Akondi³

et al. 2015

Phys. Rev. C

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Differential cross sections for the γp → π 0 p reaction have been measured with the A2 taggedphoton facilities at the Mainz Microtron, MAMI C, up to the center-of-mass energy W = 1.9 GeV. The new results, obtained with a fine energy and angular binning, increase the existing quantity of π 0 photoproduction data by ∼ 47%. Owing to the unprecedented statistical accuracy and the full angular coverage, the results are sensitive to high partial-wave amplitudes. This is demonstrated by the decomposition of the differential cross sections in terms of Legendre polynomials and by further comparison to model predictions. A new solution of the SAID partial-wave analysis obtained after adding the new data into the fit is presented.

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Section: Introductionmentioning

confidence: 99%

Measurement ofπ0photoproduction on the proton at MAMI C

Adlarson¹,

Afzal²,

Akondi³

et al. 2015

Phys. Rev. C

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“…Pairs of gamma-rays from targets bombarded with high energy x-rays have also been observed. 28 The results of all of these experiments conform to the "neutral meson hypothesis." The results of Steinberger et a/.…”

Section: (B) the Neutral Meson Hypothesismentioning

confidence: 66%

Investigations on Large Cosmic-Ray Bursts

Fahy

1951

Phys. Rev.

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Observations on large cosmic-ray bursts have been performed at the altitude of 3500 meters with a model C meter surrounded by thick lead shields. G-M counters, connected to appropriate electronic circuits, were placed over these lead shields in order to record extensive air showers simultaneously with bursts. It is found that about 2 percent of the 100 particle bursts and about 14 percent of the 1000 particle bursts under 10.7 cm Pb are produced by extensive air showers. This fraction continues to increase with increasing burst size and becomes almost 100 percent for bursts of more than 4000 particles. The experimental observations are consistent with the assumption that the part of the burst-producing radiation which does not consist of air showers or of ju-mesons is attenuated in lead with the absorption meanfree-path of 346db36 g/cm 2 . The correction for the number of bursts produced by /x-mesons is based on a revision of the calculations of Christy and Kusaka; the revised calculation indicates that /i-mesons (spin 1/2) produce 68db5 percent of the bursts in a model C meter under 10.7 cm Pb at sea level.It is pointed out that the high energy i\f-component of the cosmic radiation (i.e., those particles having strong nuclear interactions with matter) can produce enough electronic radiation to account for the observed burst frequency, if jQ l z 2 p(z)dz=0.12, where p(e/E)d(e/E) is the probability per nuclear collision that an iV-ray of high energy E produces electronic radiation of energy (e, de). The neutral meson mechanism satisfies this condition, provided one assumes that practically all of the energy of a high energy iV-ray is carried away by mesons when a nuclear collision in lead takes place, and that one-third of this energy goes into neutral mesons. The calculations are made on the assumption that the absorption mean-free-path of high energy N-rays is 124 g/cm 2 in air, and that the directional intensity of the primary cosmic radiation with energies greater than E Bev is 0.12(4.5/£) 2 sterad -1 cm -2 sec -1 at the top of the atmosphere.

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“…If a particle decays, for instance, then the decay energy will not be observed by an observer who is stationary with respect to that particle; it will be observed only by an observer who is in relative motion with respect to that particle (indeed, some experiments [22] that sought in the past to detect the decay of stationary particles have showed negative results). In addition, we must conclude that photonic exchanges in general are not possible unless relative motion is present (since H = 0 if v = 0).…”

Section: Remarks About Referencesmentioning

confidence: 99%

Fundamental Disagreement of Wave Mechanics with Relativity

Bakhoum¹

2002

Physics Essays

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Abstract:A number of well-known difficulties in physics resulted from merging the theory of relativity with the Compton-de Broglie wave mechanics. Two such problems were the failure of Dirac's relativistic wave equation to predict the correct velocity of the electron, and the fact that the measured yield from nuclear fission was found to be substantially less than the theoretical yield. It is shown that the origin of these and other problems stem from the inconsistency of the relativistic mass-energy equivalence principle with the fundamental assumptions of wave mechanics. An alternative view of the concept of mass-energy equivalence that results in a very good agreement between theory and experiment is demonstrated. The conclusions of this paper will be quite important for ongoing research, such as the current problem of the neutrino's mass.

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Evidence for the Production of Neutral Mesons by Photons

Abstract: Neutral mesons which are coupled strongly to nuclei must be expected to be unstable against decay into two or m.ore gamma rays. 'l'he modes of decay, and expected lifetimes, have been discussed extensively(l)• These gamma rays are then supposed

Cited by 86 publications

References 11 publications

Measurement ofπ0photoproduction on the proton at MAMI C

Measurement ofπ0photoproduction on the proton at MAMI C

Investigations on Large Cosmic-Ray Bursts

Fundamental Disagreement of Wave Mechanics with Relativity

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