K+-nucleus total cross section experiment and nuclear medium effects

Jonas Alster*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The low momentum K+ is the weakest of the available strongly interacting particles. It has a mean free path in nuclear matter of about 6 F which makes it a good probe for studying properties of the nuclear interior. It allows one to build a good microscopic optical potential which can be used to calculate elastic scattering and K+-nucleus total cross sections. In the latter case the calculated ratio RT = [ σtot(K+ - A) A] [ σtot(K+ - d) 2] can be expected to be more reliable because some in K+ N phase shifts will cancel. This ratio can also be measured more reliably than the total cross sections themselves because of cancellation of some systematic errors. We measured the total cross sections of K+ on D, 6Li, 12C, 28Si and 40Ca from 480 to 714 meV/c. The emphasis was placed on extracting values of RT with a precision of better than 2 percent. The results will be compared with calculations which rely on conventional nuclear medium effects. We will show that unconventional medium effects, such as nucleon swelling or density dependent exchanged meson masses will have to be invoked in order to explain the data.

Original languageEnglish
Pages (from-to)321-330
Number of pages10
JournalNuclear Physics A
Issue number1-2
StatePublished - 14 Sep 1992


FundersFunder number
U.S.-Israel Binational Science Foundation
National Science FoundationNSF-PHY-9023644
U.S. Department of EnergyDE-AC02-76CH00016


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