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Contribution to the study of mesons and their interactions with nuclei, by threshold production in low nucleon number systems; Contribution a l`etude des mesons et de leur interaction avec les noyaux, par production au seuil dans les systemes a petit nombre de nucleons

Abstract

The threshold excitation function of the pd {yields} {sup 3}HeX reaction and the total {eta}-meson production cross section near threshold in the dd {yields} {alpha}{eta} reaction have been measured using the SPES4 beam line of the Laboratoire National Saturne. In the pd {yields} {sup 3}HeX threshold function, clear signals are observed at {omega}, {eta}` and {phi}6 mesons threshold; some structures appear at central masses of the a{sub 0} and f{sub 0}-mesons, as just above the two kaons production threshold. These structures could be the signature of new hadronic exotic states. The two-pion and two-kaon physical background has been estimated in a one-pion exchange model allowing the calculation of the differential cross section for the {pi}{sup -}p {yields} nX elementary process. The results of this calculation of the physical background of the threshold excitation function. The the dd {yields} {alpha}{eta} study, the {eta}-meson was clearly observed in the spectrometer`s final focal plane spectra, in good agreement with a Monte Carlo simulation. A total cross section of the order of the nano-barn has been measured. The results are compared to some other {eta}-meson production processes with lighter nuclei than helium-4. Using different nuclei a comparative study of the {eta}-nucleus interaction has shown  More>>
Authors:
Publication Date:
Jan 01, 1995
Product Type:
Thesis/Dissertation
Report Number:
IPNO-T-95-01
Reference Number:
SCA: 662420; 662340; 663430; PA: AIX-28:060313; EDB-97:122435; SN: 97001844968
Resource Relation:
Other Information: DN: 59 refs.; TH: These (D. es Sc.).; PBD: Jan 1995
Subject:
66 PHYSICS; EXCITATION FUNCTIONS; MESON-NUCLEON INTERACTIONS; DIFFERENTIAL CROSS SECTIONS; GLUONS; KAONS; MATHEMATICAL MODELS; MESONS; MONTE CARLO METHOD; PIONS; QUANTUM CHROMODYNAMICS; QUARKS; SPECTROMETERS; TOTAL CROSS SECTIONS
OSTI ID:
519787
Research Organizations:
Paris-11 Univ., 91 - Orsay (France). Inst. de Physique Nucleaire
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE97640440; TRN: FR9502760060313
Availability:
INIS; OSTI as DE97640440
Submitting Site:
FRN
Size:
125 p.
Announcement Date:
Sep 23, 1997

Citation Formats

Roudot, F. Contribution to the study of mesons and their interactions with nuclei, by threshold production in low nucleon number systems; Contribution a l`etude des mesons et de leur interaction avec les noyaux, par production au seuil dans les systemes a petit nombre de nucleons. France: N. p., 1995. Web.
Roudot, F. Contribution to the study of mesons and their interactions with nuclei, by threshold production in low nucleon number systems; Contribution a l`etude des mesons et de leur interaction avec les noyaux, par production au seuil dans les systemes a petit nombre de nucleons. France.
Roudot, F. 1995. "Contribution to the study of mesons and their interactions with nuclei, by threshold production in low nucleon number systems; Contribution a l`etude des mesons et de leur interaction avec les noyaux, par production au seuil dans les systemes a petit nombre de nucleons." France.
@misc{etde_519787,
title = {Contribution to the study of mesons and their interactions with nuclei, by threshold production in low nucleon number systems; Contribution a l`etude des mesons et de leur interaction avec les noyaux, par production au seuil dans les systemes a petit nombre de nucleons}
author = {Roudot, F}
abstractNote = {The threshold excitation function of the pd {yields} {sup 3}HeX reaction and the total {eta}-meson production cross section near threshold in the dd {yields} {alpha}{eta} reaction have been measured using the SPES4 beam line of the Laboratoire National Saturne. In the pd {yields} {sup 3}HeX threshold function, clear signals are observed at {omega}, {eta}` and {phi}6 mesons threshold; some structures appear at central masses of the a{sub 0} and f{sub 0}-mesons, as just above the two kaons production threshold. These structures could be the signature of new hadronic exotic states. The two-pion and two-kaon physical background has been estimated in a one-pion exchange model allowing the calculation of the differential cross section for the {pi}{sup -}p {yields} nX elementary process. The results of this calculation of the physical background of the threshold excitation function. The the dd {yields} {alpha}{eta} study, the {eta}-meson was clearly observed in the spectrometer`s final focal plane spectra, in good agreement with a Monte Carlo simulation. A total cross section of the order of the nano-barn has been measured. The results are compared to some other {eta}-meson production processes with lighter nuclei than helium-4. Using different nuclei a comparative study of the {eta}-nucleus interaction has shown that the latter is more binding in the helium-4 case. Based on these data, the charge symmetry breaking in the dd {yields} {alpha}{pi}{sup 0} reaction is studied. Using a {pi}{sup 0}-{eta} mixing model, the extracted cross sections are compatible with the only measurement of this reaction cross section. (author). 59 refs.}
place = {France}
year = {1995}
month = {Jan}
}