Hypernuclear physics with the (/pi//sup +/, K/sup +/) reaction
The study of hypernuclei affords unique insights into the nature of hadronic forces beyond those obtainable from ordinary nuclear physics research. A hypernucleus consists of one or more hyperons bound to a nuclear core. In the SU(3) classification, /Lambda/,/Sigma/, and /Xi/ hyperons occupy the same octet representation of spin-parity /1/2//sup +/ baryons as the neutron and proton, the familiar constituents of ordinary nuclei. The /Lambda/ and /Sigma/ possess strangeness S = /minus/1 and isotopic spin I = 0, 1, respectively, while the /Xi/ has S = /minus/2, I = /1/2/. In the underlying quark picture, the /Lambda/ and /Sigma/ have the flavor structure s(ud)/sub I=0, 1/, compared to the combination uud for the proton. The strange quark, s, carries the strangeness quantum number S = /minus/1, which makes it distinguishable from the S = 0 u and d quarks. The lowest-lying hyperon is the /Lambda/, with a mass of 1,115.6 MeV/c/sup 2/, some 177 MeV/c/sup 2/ heavier than the proton. The study of the behavior of a hyperon embedded in the nuclear medium, through the theoretical analysis of level spectra, sheds light on the nature of the hyperon-nucleon (YN) effective interaction, i.e. on the role of the strange quark in strong interactions. This paper investigates the (/pi//sup +/, K/sup +/) reactions that produce hypernuclei. 32 refs., 5 figs., 2 tabs.
- Research Organization:
- Brookhaven National Lab., Upton, NY (USA)
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 5918730
- Report Number(s):
- BNL-42974; CONF-8906194-1; ON: DE89016410
- Resource Relation:
- Conference: International meeting on physics at KAON, Bad Honnef, Germany, F.R., 7-9 Jun 1989; Other Information: Portions of this document are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
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CROSS SECTIONS
HYPERONS
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CHARGED-PARTICLE REACTIONS
ELEMENTARY PARTICLES
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HADRON REACTIONS
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NUCLEAR FRAGMENTS
NUCLEAR REACTIONS
NUCLEI
STRANGE PARTICLES
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