Measurement of the Doubly Differential Cross Section for [pi]− P [arrow Pi] [pi]− N Near Threshold PDF Download

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Measurement of the Doubly Differential Cross Section for [pi]− P [arrow Pi] [pi]− N Near Threshold

Author: John B. Walter
Publisher:
ISBN:
Category : Pions
Languages : en
Pages : 240

Book Description

Measurement of the Doubly Differential Cross Section for [pi]− P [arrow Pi] [pi]− N Near Threshold

Author: John B. Walter
Publisher:
ISBN:
Category : Pions
Languages : en
Pages : 240

Book Description

Measurement of the Doubly Differential Cross Section for [pi]− P [arrow Pi] [pi]− N Near Threshold

Author:
Publisher:
ISBN:
Category : Differential cross sections
Languages : en
Pages :

Book Description

Measurement of the Doubly Differential Cross Section For. Pi. −p. --]. Pi. . Pi. −n Near Threshold

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
The doubly differential cross sections for the .pi. from the reaction .pi.−p .-->. .pi.pi.−n were measured at about twenty points for each of five energies between 245 MeV and 356 MeV. The experiment was carried out at the Clinton P. Anderson Meson Physics Facility, where a double focusing magnetic spectrometer detected the .pi. mesons produced in a liquid hydrogen target. The measurements were normalized by comparison with .pi.−p elastic scattering measured with the same apparatus. These are the first such measurements in this energy range, and have an accuracy between 4.7% and 39%. The integrated reaction cross section was determined at each energy with an accuracy of about 5%. These agree with but are an improvement over previous measurements in this energy range. Comparison of the extrapolated threshold value of the mean square modulus of the matrix element with the soft pion calculations favors the symmetry breaking mechanism of Weinberg (xi = 0). It also demonstrates the futility of attempting to determine the symmetry breaking parameter xi from a single measurement of the integrated reaction cross section.

Measurement of the Cross Section for Pi[+]p $ Pi[+]pi[+]n Near Threshold

Author: James H. Crouch
Publisher:
ISBN:
Category :
Languages : en
Pages : 150

Book Description

Measurement and Isobar-model Analysis of the Doubly Differential Cross Section for The. Pi. Produced In. Pi. −p. --]. Pi. . Pi. −n

Author:
Publisher:
ISBN:
Category :
Languages : en
Pages :

Book Description
The doubly differential cross section d2sigma/d.cap omega.dT for .pi./sup +/ mesons produced in the reaction .pi.−p .-->. .pi./sup +/.pi.−n was measured at 203, 230, 256, and 358 MeV with a single-arm magnetic spectrometer. A set of five previous measurements at 254, 280, 292, 331, and 356 MeV was reanalyzed with the new measurements. Integrated cross sections were calculated for the combined data set with unprecedented accuracy for this energy range. The chiral-symmetry-breaking parameter was determined to be epsilon = -0.03 +- 0.26 by extrapolating the mean square modulus of the matrix element to threshold and comparing the threshold matrix element with the prediction of soft-pion theory. This value of epsilon is consistent with zero as required by the Weinberg Lagrangian. Measurements at the three highest energies were compared with the results of an isobar-model analysis of bubble-chamber events by an LBL-SLAC collaboration. After allowing for an overall normalization difference, the measurements at 331 and 358 MeV were in excellent agreement with the results of their analysis. The measurement at 292 MeV required variation of the PS11(epsilonN) amplitude, as well as the overall normalization, which could be due to the limited number of bubble-chamber events available for the LBL-SLAC analysis at this energy. A partial-wave analysis of the measurements was also carried out with the VPI isobar model. Within this model, the matrix element contains a background term calculated from a phenomenological .pi. N Lagrangian that is consistent with the hypotheses of current algebra and PCAC. The reaction was found to be dominated by the initial P11 wave. Production of the .delta. isobar from initial D waves was found to be significant at the two highest energies.

Measurement and Isobar-model Analysis of the Doubly Differential Cross Section for the [pi] Produced in [pi]− P [arrow Pi] [pi]− N

Author: Donald Mark Manley
Publisher:
ISBN:
Category : Cross sections (Nuclear physics)
Languages : en
Pages : 504

Book Description

Measurement of the Doubly Differential Cross Section for [pi]− P [arrow Pi] [pi]− N Near Threshold PDF Download

Measurement of the Doubly Differential Cross Section for [pi]− P [arrow Pi] [pi]− N Near Threshold

Measurement of the Doubly Differential Cross Section for [pi]− P [arrow Pi] [pi]− N Near Threshold

Measurement of the Doubly Differential Cross Section for [pi]− P [arrow Pi] [pi]− N Near Threshold

Measurement of the Doubly Differential Cross Section For. Pi. −p. --]. Pi. . Pi. −n Near Threshold

Measurement of the Cross Section for Pi[+]p $ Pi[+]pi[+]n Near Threshold

Measurement and Isobar-model Analysis of the Doubly Differential Cross Section for The. Pi. Produced In. Pi. −p. --]. Pi. . Pi. −n

Measurement and Isobar-model Analysis of the Doubly Differential Cross Section for the [pi] Produced in [pi]− P [arrow Pi] [pi]− N

Measurement of the Cross Section for [pi] + P --> [pi] + [pi] + N Near Threshold

Analysis of [pi]+p [right Arrow] [pi]+[pi]0p Reaction Near Threshold

Publications of Los Alamos Research

Measurement of the Cross Section for Π+p->π+π+n Near Threshold