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Search for Double Antikaon Production in Nuclei by Stopped Antiproton Annihilation P. Kienle, Excellence Cluster Universe, TU München. Introduction into the search for double kaonic nuclear cluster production by stopped antiproton annihilation Experimental approach @ J-PARC
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Introduction into the search for double kaonic
nuclear cluster production by stopped
Experimental approach @ J-PARC
Experimental approach @ AD and FAIR
Nuclear Cluster” Production
Preludeto „Double-Strange Nuclei“ @ LEAP
W. Weise, arXiv: 0507.058 (nucl-th) 2005
P. Kienle, J. Mod. Phys., A22 (2007) 365
P. Kienle, J. Mod. Phys., E16 (2007) 905
J. Zmeskal et al. EXA/LEAP 08, Hyper, Int
J. Zmeskal et al. „Double-Strangeness Pro-
ductionby Antiprotons, May 2009, CERN
with Strangness S =-1
PL,B587,167 (2004). & NP, A754, 391c (2005).
We use pbarA annihilation
The elementary pbar-p annihilation reaction:
is forbidden for stopped pbar,
because of a negative Q-value of 98MeV
However, if deeply bound multi kaonic nuclear clusters exist, production by pbarannihilation reactions will be possible!
Observations of the double-strangeness production in stopped pbar annihilation have been reported by 2 groups only, DIANA@ ITEP and OBELIX@ CERN/LEAR.
Although the observed statistics is very low,
their results have indicated a high yield of ~10-4
possible to explore the exotic systems with a dedicated experiment
In the following discussion, we focus on the reaction:
(although K-K-pp decay modes are not known,)
we assume the most energetic favored decay mode:
final state = K+K0LL
K+ K0 X momentum spectra
In the K-K-pp production channel, the kaons have very small momentum of up to 300MeV/c, even if B.E.=200MeV.
We have to construct low mass material detectors.
We would like to perform the proposed experiment
at K1.1 or K1.8BR beam line
pbar stopping-rate evaluation by GEANT4
1.3x103 stopped pbar/spill
@ 0.65GeV/c, ldegrader~14cm
pbar production yield
with a Sanford-Wang
a mere assumption!
We are considering
2-types of detector
E15 setup @ K1.8BR
New dipole setup @ K1.1
LL inv-mass with NEW setup
LL inv-mass with E15 setup
53 K-K-pp events/month
42 K-K-pp events/month
sK-K-pp = 27MeV
sH = 0.7MeV
sK-K-pp = 34MeV
sH = 14MeV
Backgrounds from S0gL have to be taken into account
K+K0 miss-mass with NEW setup
K+K0 miss-mass with E15 setup
sK-K-pp = 8MeV
sH = 25MeV
sK-K-pp = 12MeV
sH = 45MeV
17 K-K-pp events/month
24 K-K-pp events/month
the mechanism is NOT known well
because of low statistics
of the experimental results!
they discuss the possibility of formation and decay of K-K-nn and K-K-pnn bound system
LL inv. mass
strong correlation of LL opening-angle
in K-K-pp/H productions
pbar3He charged particle multiplicity at rest
CERN LEAR, streamer chamber exp. NPA518,683 91990).
expected stopped-pbar yield = 1.3x103/spill
All events with a scintillator hit will be accumulated
LL invariant mass : inclusive events
K+K0 missing mass : semi-inclusive events (w/ one more L)
This exclusive channel study is equivalent to
the unbound (excited) H-dibaryon search!
Possible background channels
be distinguished by inv.-mass only
major background source
be eliminated by
the kinematical constraint