Quasielastic Pion Scattering Near the (3,3) Resonance PDF Download
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Author: Philip Varghese
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ISBN:
Category : Pions
Languages : en
Pages : 370
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Book Description
Author: Philip Varghese
Publisher:
ISBN:
Category : Pions
Languages : en
Pages : 370
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Book Description
Author:
Publisher:
ISBN:
Category : Pions
Languages : en
Pages :
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Book Description
![Quasielastic Pion Scattering Near the (3,3) Resonance. [255 MeV, Differential Cross Section Ratio]. PDF](https://books.google.com/books/content/images/frontcover/cGaSAQAACAAJ?fife=w80-h100)
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Category :
Languages : en
Pages :
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The quasielastic pion scattering process (.pi., .pi.p), in which an energetic pion scatters off a target nucleus, knocking-out a bound proton, was studied to determine the role of recoil nucleon charge exchange in the mechanism of the process near the (3,3) free particle pion-nucleon resonance. Calculations, which incorporate the hypothesis of final state charge exchange of the outgoing nucleon, were performed to predict expectations for observing the process. Experimental measurements were made on 27Al and 2°8Pb, using 255-MeV .pi. and .pi.− beams. The outgoing protons were observed in a counter telescope in singles and coincidence modes. Singles spectra were measured at proton angles theta/sub rho/ = 45, 55, 64, and 90° and cross sections were calculated as a function of the energy of the detected proton, for each of the targets. Values of the ratio of .pi. to .pi.− cross sections were calculated for each of the angles of observation. The results obtained indicate that the singles spectra contain events from processes other than quasielastic scattering and that the quasielastic events cannot be easily disentangled from the large background due to such events. The study has thus established the inadequacy of observing quasielastic pion scattering in a single arm measurement. Coincidence measurements were made by observing the recoil protons in coincidence with the scattered pions, which were detected in a scintillator counter telescope. The ratio of .pi.+ to .pi.− cross sections were obtained for each target for the angular settings (theta/sub rho/, theta/sub .pi./) = (55, 50°) and (64, 37.5°). The measured values of 7.0 +- 0.7 for 27Al and 4.5 +- 0.5 for 2°8Pb are substantially below the impulse approximation no-charge-exchange limit of 9. The observed A dependence of this cross section ratio is in agreement with the predictions of the semiclassical charge exchange model, showing the influence of charge exchange. 66 references.
Author:
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Category : Nuclear energy
Languages : en
Pages : 934
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Author: Lowell Arthur Charlton
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Category : Mesons
Languages : en
Pages : 264
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Author:
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Category : Nuclear energy
Languages : en
Pages : 1376
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Author:
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Category : Power resources
Languages : en
Pages : 484
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Author: Simone Gutzwiller
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Category :
Languages : en
Pages : 127
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![Elastic Scattering of Pions from Tritium and [sup 3]He in the Backward Hemisphere in the Region of the [Delta][sub 33](1232) Resonance PDF](https://books.google.com/books/content/images/frontcover/6KfujwEACAAJ?fife=w80-h100)
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Category :
Languages : en
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Several experiments have measured nominally-charge-symmetric scattering of pions from tritium ([sup 3]H) and [sup 3]He. These experiments have covered incident pion energies from 142 MeV to 295 MeV and scattering angles up to 110[degrees] in the laboratory. The results have been used to study charge-symmetry breaking and nuclear scattering systematics. In the work I have extended these measurements to angles near 180[degrees] for pion energies of 142 MeV, 180 MeV, 220 MeV, and 256 MeV, which bracket the [Delta][sub 33] pion-nucleon resonance. This is the most extensive set of [pi]T and [pi][sup 3]He data in this kinematical region. It will allow tests of scattering theory of pion-nucleus interactions and charge-symmetry breaking in back-angle scattering, and, within the limits of these two theories, it may help improve our understanding of the structure of these nuclei.
Author: Md. A. Rahman
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Category :
Languages : en
Pages :
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