Nuclear physics with kaons. [Review] Page: 2 of 8
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;.ivi.!'Ar ;.iy ' • wiru ram:
{'ill .over
I'hys ic:. 1 ■ | .. rtment
Bj ookhaven Mil i.eia ! Laboratoi .•
Upton, Nr'..1 York 1.1973
AH 1 iKA<T
- Wr ■ tt '-5j .1 ".v' | in types ot nuclear ana elemental t particle questions
which can be addressed by studying t.ion-induced fractions in nuclei,^' •.
icr
Kaon:; oi fer a variety of pas;; i !> i 1 i ties for the study of nuclear and
hypernuclear structure phyr; Los, as well as the interaction of strange
haryons (A, };,»•) with nucleons. Ke-euLly, there has been a surge of inter-
est in kaon physics. Pioneering experiments^ on the (K“,ir~) strangeness
exchange react ion at CKRN and, more re< ently, at. Jirookhaven , have pro-
vided us with a first glimpse oi the e:- cited stair spectrum of hyper-
nuclei. The present state of hypenme. 1 ear physics has, been summarized at
tliis conference* ** ami in scvetal recent review articles^. I will, instead,
focus attention on 1 ut.ure d i root ion in hypernuc 1 ear spectroscopy and the
rule of the K* .is a nuclear prole. Ue emphasize the. unique features of
kaous, but also point out the eemi.i. n g i ound shared with other hadrons in
terms of nucliai .structure st.mlie..
Tin: K+ and K" differ Uraniat ic.illy in their ttrong interactions with
the nucleus, particularly in tin lev. and medium energy region
(Pl,j, 1 i CeV/c) . Tl> is is in conliest. to n+ and .t~, whose strong inter-
actions with N=-K nuclei arc the same. This il i 11 • rence points out the role
of strangeness S, a const rvul quant ity for strong. Interactions. We have
S -■ H for K+ and S = -1 for K~; tin- on Ly haryons with |s|=l, stable with
re's pec t to strong Interne t ions, are i he A and .2 with S =» -1.
Tiie conservat ion of sirangenes- leads to via ; different interactions
of K+ and K” with nuc 1 eons-,, and lueie, also with nuclei. The K"N system
(S = -1) can fuse to form r0%iinae es (also S - -1) with a large cross
section (o-pQ-p e 30mb for 100 s 'I;’ ■_ '>00 MeV) . The Y* resonances, which
are ordinary three quark (Q^) compe i t es, also c. immunicate witli the An
and lit channels, which are energet, i < illy accessible even at the K N
threshold. The propagation and mollification of i resonances in the
nuclear environmunt is an tatriguing problem, analogous to the formation
of N resonances by nM interact ion . in the nucleus. Like the pLon in the
resonance region, the K“ is a stion.ly absorbed particle in nuclei. Its
interactions are thus primarily lo< ali/ed in the nuclear periphery.
The K*N interaction, on the olher hand, is relatively weak at low
energies (n']o'p lOmb for 1’j.^ : Son MeV/c) . The Y resonances are not
permissible as "compound states" ot the K+N system;, because of strange-
ness conservation. Only the "ex. ! i y-+l resonances, called Z 's, are
* Invited talk presented at the i it 11 !l'lr Kaon Factory Workshop, Vancouver,
B.C., Canada, August 13-1A, 1979.
** Supported by the U.S. lk-part'lieut ol Energy under Contract No.
EY-76-C-02-0016.
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Dover, C. B. Nuclear physics with kaons. [Review], article, January 1, 1979; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1095671/m1/2/: accessed April 17, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.