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AbstractAbstract
[en] Recent technological developments regarding secondary beams, magnetic spectrometers and detectors have made it possible to use electronic counter techniques to study hypernuclei. The in-flight strangeness exchange reaction K-+AZ → π-+sub(Λ)AZ is kinematically the most favorable. To undertake this experimental study, at Saclay we have built the large solid angle (20 msr), broad momentum acceptance (+-18%) and high resolution (dp/p=10-3) magnetic spectrometer SPES II. On its focal plane three large wire chambers allow us to measure the coordinates of the outgoing particle with a precision better than one millimeter. This whole system has been transported to CERN where, in conjunction with the secondary beam line K22, it has been used to investigate the spectroscopy of eleven hypernuclei: sub(Λ)6Li, sub(Λ)7Li, sub(Λ)9Be, sub(Λ)12C, sub(Λ)16O, sub(Λ)27Al, sub(Λ)32S, sub(Λ)40Ca, sub(Λ)51V, sub(Λ)89Y, and sub(Λ)209Bi. For the first time the precise and unambiguous identification of hypernuclear excited states has been possible. This has allowed us to determine the central and the spin-orbit of the Λ-nucleus interaction
[fr]
Du fait des developpements technologiques recents concernant les faisceaux secondaires, les spectrometres magnetiques et les detecteurs, il est devenu possible d'appliquer la technique des compteurs electroniques a l'etude des hypernoyaux. Il est alors tres favorable, du point de vue de la cinematique, d'utiliser la reaction de transfert d'etrangete en vol K-+AZ → π-+sub(Λ)AZ. Pour mener cette etude experimentale nous avons construit a Saclay le spectrometre magnetique SPES II a grand angle solide (20 msr), grande acceptance en impulsion (+-18%) et haute resolution (10-3 en dp/p). Sur la focale du spectrometre des chambres a localisation de grande dimension (170 x 25 cm2) permettent de mesurer les coordonnees de la trajectoire sortante avec une precision meilleure que le millimetre. Ce systeme a ete transporte au CERN ou, associe a la ligne de faisceau secondaire K22, il a ete utilise pour l'etude spectroscopique de onze hypernoyaux, des plus legers aux plus lourds: sub(Λ)6Li, sub(Λ)7Li, sub(Λ)9Be, sub(Λ)12C, sub(Λ)16O, sub(Λ)27Al, sub(Λ)32S, sub(Λ)40Ca, sub(Λ)51V, sub(Λ)89Y et sub(Λ)209Bi. Pour la premiere fois il a ete possible d'identifier de maniere incontestable et avec precision les etats excites des hypernoyaux. Nous avons pu ainsi mesurer le terme central et le terme spin-orbite de l'interaction Λ-noyauOriginal Title
Spectroscopie des hypernoyaux; SPES II spectrometer
Primary Subject
Source
Dec 1981; 168 p; These (D. es Sc.).
Record Type
Report
Literature Type
Thesis/Dissertation; Numerical Data
Report Number
Country of publication
ALUMINIUM ISOTOPES, BARYONS, BERYLLIUM ISOTOPES, BISMUTH ISOTOPES, CALCIUM ISOTOPES, CARBON ISOTOPES, DATA, ELEMENTARY PARTICLES, EVEN-EVEN NUCLEI, EVEN-ODD NUCLEI, FERMIONS, HADRONS, HEAVY NUCLEI, HYPERONS, INFORMATION, INTERMEDIATE MASS NUCLEI, ISOMERIC TRANSITION ISOTOPES, ISOTOPES, LIGHT NUCLEI, LITHIUM ISOTOPES, MEASURING INSTRUMENTS, NUCLEI, NUMERICAL DATA, ODD-EVEN NUCLEI, ODD-ODD NUCLEI, OXYGEN ISOTOPES, RADIOISOTOPES, SECONDS LIVING RADIOISOTOPES, SPECTRA, SPECTROMETERS, STABLE ISOTOPES, STRANGE PARTICLES, SULFUR ISOTOPES, VANADIUM ISOTOPES, YTTRIUM ISOTOPES
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