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Measurement of recoil proton polarization in the process of. pi. /sup -/ photoproduction from neutrons in the energy range between 700 and 1200 MeV

Abstract

The recoil proton polarization for ..gamma..n ..-->.. ..pi../sup -/p was measured around the third resonance region. Both momentum vectors of the proton and the pion were determined by the magnetic spectrometers. The proton polarization was measured by means of proton-carbon scattering in the polarization analyzer located behind the proton spectrometer. Below 900 MeV incident photon energy, our data are consistent with the other existing experimental data (THETA*sub..pi.. = 90/sup 0/) and the predictions of partial-wave analyses. Above 1000 MeV, however, a large discrepancy was observed between our data and the predictions of the partial-wave analyses. This discrepancy stands out as the pion c.m. angle increases. A new partial-wave analysis was made for ..gamma..n ..-->.. ..pi../sup -/p including our polarization data, and the accuracy of the experimentally determined electromagnetic coupling constants of the third resonances were greatly improved. In particular, a finite amount of the helicity 3/2 amplitude for the ..gamma..n ..-->.. F/sub 15/(1688) resonance was obtained against the predictions of the quark models, by Copley, Karl and Obryk and by Feynman, Kislinger and Ravendal but in agreement with the relativistic quark models of Sugimoto and Toya, and Kubota and Ohta.
Authors:
Takeda, H; Arai, I; Fujii, T; Ikeda, H; Iwasaki, H; Kajiura, N; Kamae, T; Kawabata, S; Ogawa, K; Sumiyoshi, T [1] 
  1. Tokyo Univ. (Japan). Dept. of Physics
Publication Date:
May 01, 1980
Product Type:
Journal Article
Reference Number:
AIX-11-551036; EDB-81-101666
Resource Relation:
Journal Name: Nucl. Phys. B; (Netherlands); Journal Volume: 168:1
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; PHOTON-NEUTRON INTERACTIONS; POLARIZED PRODUCTS; PIONS MINUS; PHOTOPRODUCTION; COUPLING CONSTANTS; GEV RANGE 01-10; HELICITY; MEV RANGE 100-1000; N-1688 RESONANCES; PARTIAL WAVES; POLARIZATION-ASYMMETRY RATIO; PROTONS; SCATTERING AMPLITUDES; AMPLITUDES; BARYON RESONANCES; BARYONS; BASIC INTERACTIONS; BOSONS; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; GEV RANGE; HADRONS; INTERACTIONS; MESONS; MEV RANGE; N RESONANCES; NUCLEONS; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PARTICLE PROPERTIES; PHOTON-BARYON INTERACTIONS; PHOTON-HADRON INTERACTIONS; PHOTON-NUCLEON INTERACTIONS; PIONS; PSEUDOSCALAR MESONS; RESONANCE PARTICLES; 645103* - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Interactions & Baryon & Meson Properties
OSTI ID:
6145416
Country of Origin:
Netherlands
Language:
English
Other Identifying Numbers:
Journal ID: CODEN: NUPBB
Submitting Site:
INIS
Size:
Pages: 17-31
Announcement Date:
Oct 01, 1980

Citation Formats

Takeda, H, Arai, I, Fujii, T, Ikeda, H, Iwasaki, H, Kajiura, N, Kamae, T, Kawabata, S, Ogawa, K, and Sumiyoshi, T. Measurement of recoil proton polarization in the process of. pi. /sup -/ photoproduction from neutrons in the energy range between 700 and 1200 MeV. Netherlands: N. p., 1980. Web.
Takeda, H, Arai, I, Fujii, T, Ikeda, H, Iwasaki, H, Kajiura, N, Kamae, T, Kawabata, S, Ogawa, K, & Sumiyoshi, T. Measurement of recoil proton polarization in the process of. pi. /sup -/ photoproduction from neutrons in the energy range between 700 and 1200 MeV. Netherlands.
Takeda, H, Arai, I, Fujii, T, Ikeda, H, Iwasaki, H, Kajiura, N, Kamae, T, Kawabata, S, Ogawa, K, and Sumiyoshi, T. 1980. "Measurement of recoil proton polarization in the process of. pi. /sup -/ photoproduction from neutrons in the energy range between 700 and 1200 MeV." Netherlands.
@misc{etde_6145416,
title = {Measurement of recoil proton polarization in the process of. pi. /sup -/ photoproduction from neutrons in the energy range between 700 and 1200 MeV}
author = {Takeda, H, Arai, I, Fujii, T, Ikeda, H, Iwasaki, H, Kajiura, N, Kamae, T, Kawabata, S, Ogawa, K, and Sumiyoshi, T}
abstractNote = {The recoil proton polarization for ..gamma..n ..-->.. ..pi../sup -/p was measured around the third resonance region. Both momentum vectors of the proton and the pion were determined by the magnetic spectrometers. The proton polarization was measured by means of proton-carbon scattering in the polarization analyzer located behind the proton spectrometer. Below 900 MeV incident photon energy, our data are consistent with the other existing experimental data (THETA*sub..pi.. = 90/sup 0/) and the predictions of partial-wave analyses. Above 1000 MeV, however, a large discrepancy was observed between our data and the predictions of the partial-wave analyses. This discrepancy stands out as the pion c.m. angle increases. A new partial-wave analysis was made for ..gamma..n ..-->.. ..pi../sup -/p including our polarization data, and the accuracy of the experimentally determined electromagnetic coupling constants of the third resonances were greatly improved. In particular, a finite amount of the helicity 3/2 amplitude for the ..gamma..n ..-->.. F/sub 15/(1688) resonance was obtained against the predictions of the quark models, by Copley, Karl and Obryk and by Feynman, Kislinger and Ravendal but in agreement with the relativistic quark models of Sugimoto and Toya, and Kubota and Ohta.}
journal = []
volume = {168:1}
journal type = {AC}
place = {Netherlands}
year = {1980}
month = {May}
}