Measurement of low energy [ital K][sup +] total cross sections on [ital N]=[ital Z] nuclei

Journal Article · Sun May 01 00:00:00 EDT 1994 · Physical Review, C (Nuclear Physics); (United States)

DOI:https://doi.org/10.1103/PhysRevC.49.2569· OSTI ID:5013298

Weiss, R; Aclander, J; Alster, J; Barakat, M; Bart, S; Chrien, R E; Krauss, R A; Johnston, K; Mardor, I; Mardor, Y; May Tal-beck, S; Piasetzky, E; Pile, P H; Sawafta, R; Seyfarth, H; Stearns, R L; Sutter, R J; Yavin, A I ^[1]

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1. School of Physics, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978 (Israel) Brookhaven National Laboratory, Upton, New York 11973 (United States) University of Houston, Houston, Texas 77204 (United States) Texas A M University, College Station, Texas 77843 (United States) KFA, Juelich (Germany) Vassar College, Poughkeepsie, New York 12601 (United States)

The total cross sections for [ital K][sup +] on deuterium, [sup 6]Li, [sup 12]C, [sup 28]Si, and [sup 40]Ca have been measured at four-momenta in the range of 480--714 MeV/[ital c]. The experimental technique was of the standard transmission type. Because of its long mean free path in nuclear matter at low energies the [ital K][sup +] can be expected to probe the entire volume of the nucleus. Indeed we found that, to better than 10% [sigma]([ital K][sup +][ital A])=[ital A][sigma]([ital K][sup +][ital N]) up to [ital A]=40. This feature was used to study more delicate effects of the nuclear medium. Special emphasis was placed on measuring the total cross section ratios of [ital K][sup +][ital A] to [ital K][sup +] D with a precision of [le]2%. This ratio is a good measure of nuclear medium effects because many experimental as well as theoretical systematic uncertainties cancel in the ratio. We discuss the medium dependence as a function of [ital A]. The data do not agree with calculations which include only conventional medium effects. This points towards the need of unconventional nuclear medium effects such as partial quark deconfinement, mass rescaling of nuclear pionic fields or pion excess in nuclei. Thus far only calculations based on unconventional medium effects for [sup 12]C exist. Calculations for the other nuclei are needed before quantitative conclusions can be drawn.

• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5013298
• Journal Information: Physical Review, C (Nuclear Physics); (United States), Journal Name: Physical Review, C (Nuclear Physics); (United States) Vol. 49:5; ISSN 0556-2813; ISSN PRVCAN
• Country of Publication: United States
• Language: English

Related Subjects

662340 -- Hadron Interactions-- (1992-)
663110 -- General & Average Properties of Nuclei & Nuclear Energy Levels-- (1992-)
663300 -- Nuclear Reactions & Scattering
General-- (1992-)
663460* -- Meson- & Hyperon-induced Reactions & Scattering-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
CALCIUM 40 TARGET
CARBON 12 TARGET
CHARGED-PARTICLE REACTIONS
CROSS SECTIONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
HADRON REACTIONS
KAON PLUS REACTIONS
KAON REACTIONS
LITHIUM 6 TARGET
MATTER
MEAN FREE PATH
MESON REACTIONS
MEV RANGE
MEV RANGE 100-1000
NUCLEAR MATTER
NUCLEAR REACTIONS
POSTULATED PARTICLES
QUARKS
SILICON 28 TARGET
TARGETS
TOTAL CROSS SECTIONS