hypernuclear physics with finuda now and in the future
TRANSCRIPT
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Tullio BressaniKEK-RIKEN-INFN meeting
Tsukuba, December 13-14, 2004
Hypernuclear Physics with FINUDA now and in the future
Hypernuclear Physics with FINUDA now and in the future
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The FINUDA Collaboration The FINUDA Collaboration
Bari University and I.N.F.N. BariBrescia University and I.N.F.N. PaviaKEKL.N.F. / I.N.F.N. FrascatiPavia University and I.N.F.N. PaviaRIKENSeoul National UniversityTeheran Shahid Beheshty UniversityTorino University and I.N.F.N. TorinoTorino Polytechnic and I.N.F.N. TorinoTrieste University and I.N.F.N. TriesteTRIUMF
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Outline Outline 1) the FINUDA experiment
– the physics program– the apparatus
2) the results– hypernuclear spectroscopy– search for neutron-rich hypernuclei– hypernucleus (rare) decays– Kaon bound state K-pp
3) future plans
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Physics output (S=-1) Physics output (S=-1)
nuclearmodels
nuclearmodels
4B weakinteraction4B weak
interaction
quarksubstructures
quarksubstructures
neutron richΛ-hypernucleineutron richΛ-hypernuclei
mediumeffect
mediumeffect
(weak) decay(weak) decayn
nnn
np
pp
p ppΛ
low-energyN-Y interactionlow-energy
N-Y interaction
spectroscopyspectroscopy
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Drawbacks of the secondary beam techniquesDrawbacks of the secondary beam techniques
1 m
K- K-
1 m
Liquid Hetarget
Liquid Hetarget
Several meters fromproduction target to
the experimental area
Several meters fromproduction target to
the experimental areaHigh energy kaonbeam 370 MeV
High energy kaonbeam 370 MeV
Thick solid targetsto have acceptable
counting rates
Thick solid targetsto have acceptable
counting rates
limited solid angleof acceptance
limited solid angleof acceptance
Thick degradersto stop high
energy kaons
Thick degradersto stop high
energy kaons
High energy kaonbeam 280 MeV
High energy kaonbeam 280 MeV
The high resolution of available spectrometers is uselesswith:
ï Thick targets (~g/cm2) to ensure acceptable counting ratesï Thick degraders to stop high energy beams, beam
absorbtion and beam momentum spread
The high resolution of available spectrometers is uselesswith:
ï Thick targets (~g/cm2) to ensure acceptable counting ratesï Thick degraders to stop high energy beams, beam
absorbtion and beam momentum spread
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5.2 A (max)current/ring
8.9 1010part./bunch
up to 120bunch/ring
35 mmσz (rms)
0.021 mmσy (rms)
368.25 MHzfrequency (max)
12.5 mradcrossing angle
30 mmbunch length
2.11 mmσx (rms)
5 1032 cm-2 s-1luminosity
510 MeVenergy
FINUDA @ DAΦNE FINUDA @ DAΦNE
−Λ
−
+−+−
+→+
→→+
π
φ
ZZΚΚΚee
AAstop
→Λ ZA
nnZnpZ
Z
A
A
A
++
++−
++
−
−
−
)2(
)2( )1()1( π
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FINUDA @ DAΦNE FINUDA @ DAΦNE
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FINUDA @ DAΦNE FINUDA @ DAΦNE
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Detectors of the internal region Detectors of the internal region
internal scintillator barrel mounted (tofino)
internal scintillator barrel mounted (tofino)
silicon microstrips arrays ISIM/OSIM
silicon microstrips arrays ISIM/OSIM
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FINUDA detectors performancesFINUDA detectors performances❖ s.c. solenoid: B = 1.0 T; field homogeneity within 2%
❖ interaction/target region: K+/K- identification, hypernucleus production and detection
❖ tracking devices: measurement of trajectoriesand momenta of charged particles (∆p/p 3.5‰)
❖ external scintillator barrel: triggerand neutron detection
VDET z resolutionVDET z resolution
❖ He chamber: minimization of particle multiple scattering
TOFout: σt = 500 ps FWHMefficiency ≥ 10%; ∆E = 8 MeV
TOFout: σt = 500 ps FWHMefficiency ≥ 10%; ∆E = 8 MeV
∆p/p: He atmosphere = 3.5‰air = 2%
∆p/p: He atmosphere = 3.5‰air = 2%
ISIM/OSIM: σz = 30 μm; ∆E = 20% FWHMTOFin: σt = 250 ps
ISIM/OSIM: σz = 30 μm; ∆E = 20% FWHMTOFin: σt = 250 ps
LMDC: σ(ρ, φ) = 150 μm; σz ≤ 1% wire length STB: σ(ρ, φ) = 150 μm; σz 500 μm
LMDC: σ(ρ, φ) = 150 μm; σz ≤ 1% wire length STB: σ(ρ, φ) = 150 μm; σz 500 μm TOFout time resolutionTOFout time resolution
PID in OSIMPID in OSIM
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K + / K – identification K + / K – identification Hypernuclear trigger:ï 2 hits on tofino over threshold (kaon)ï extended back to backï multiplicity (>2) on tofoneï Time correlation tofino-tofone (<10ns)
Hypernuclear trigger:ï 2 hits on tofino over threshold (kaon)ï extended back to backï multiplicity (>2) on tofoneï Time correlation tofino-tofone (<10ns)
over thresholdover threshold
very effective slow kaon recognition
very effective slow kaon recognition
K stop calculationGEANE tracking
K stop calculationGEANE tracking
only twomeasured points
on ISIM
only twomeasured points
on ISIM
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FINUDA key features FINUDA key features very thin nuclear targets (0.1 ÷ 0.3 g/cm2)
decay mode studydecay mode study
high resolution spectroscopyhigh resolution spectroscopy
high degree of flexibilityhigh degree of flexibility
coincidence measurement with large acceptance
irradiation of different targets in the same run
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FINUDA first run FINUDA first run
FINUDA
FINUDA
14-Oct-2003 to 22-Mar-2004:
• 250 pb-1 delivered to IP2• 33 pb-1 machine tuning• 10 pb-1 FINUDA debugging• 190 pb-1 useful data taking
14-Oct-2003 to 22-Mar-2004:
• 250 pb-1 delivered to IP2• 33 pb-1 machine tuning• 10 pb-1 FINUDA debugging• 190 pb-1 useful data taking
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Bhabha event Bhabha event
e+
e−e+e- → e+e-e+e- → e+e-
ρ0 → e+e-ρ0 → e+e-
K → π+ π-K → π+ π-0SK
e+e- invariant mass (GeV)
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The typical event The typical event
π−
μ+
μ+
Κ+
Κ−
π−
Φ
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Target envelope by K - stopping pointsTarget envelope by K - stopping points
Φ
7Li
6Li
27Al51V
12C12C
12C
6Li
Isim 7
Isim 8
Isim 1
Isim 2
12.5 mrad
e+
e-
Φ
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K + / K - stopping pointsK + / K - stopping points
K- stop pointsin targets
K- stop pointsin targets
total K-
stop pointstotal K-
stop points
K- stop pointsin ISIM
K- stop pointsin ISIM
a supplementarysilicon target for
free
a supplementarysilicon target for
free
K- stop pointsin othervolumes
K- stop pointsin othervolumes
KaonscrossingLithium
KaonscrossingLithium
Beam pipeBeam pipe
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Improvement in momentum resolution Improvement in momentum resolution
∆p/p ~ 0.6%∆p/p ~ 0.6%
(GeV/c)
Κ+ → μ+νμΚ+ → μ+νμ
Κ+ → π+π0Κ+ → π+π0
Κ+ → μ+νμΚ+ → μ+νμ
[GeV/c]
∆p/p ~ 0.4%
∆p/p ~ 0.4%
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K- 12C ⇒ π− X inclusive spectra K- 12C ⇒ π− X inclusive spectra
12ΛC
hyperfragments
mesonic decay
No χ2 cutsó : K+/- vertex: 3 cm--- : K- vertex: 0.5 cm
K+ vertex: 3 cm
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Background reactions: π - spectrumBackground reactions: π - spectrum
K- n→Λπ-
Λ→p π-
K- p→Σ+ π-
K- p→Σ- π+
Σ-→ n π-
K- (NN)→Σ- NΣ- → n π-
K- n→Σ0 π-
TOT
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K- 12C ⇒ p X inclusive spectrum K- 12C ⇒ p X inclusive spectrum
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Spectroscopy Spectroscopy
medium-Asystems
(~ terra incognita)
neverstudiedbefore
referencenuclide
doorway forlight systems( H, He , He)HeΛ
4 He5ΛHΛ
4
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FINUDA vs. KEK-E369 FINUDA vs. KEK-E369
H. Hotchi et al., Phys. Rev. C 64 (2001) 044302 H. Hotchi et al., Phys. Rev. C 64 (2001) 044302
ΔE ~ 1.5 MeV FWHMΔE ~ 1.5 MeV FWHM
ΔE ~ 1.3 MeV FWHMΔE ~ 1.3 MeV FWHM
12C(K- ,π-)12C12C(K- ,π-)12C−stopK C12
Λ
12C(π+,K+)12C12C(π+,K+)12CC12Λ
preliminary
preliminary
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6Li target: π - spectrum6Li target: π - spectrum
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7Li target: π – spectrum7Li target: π – spectrum
# 2 274.1
# 1 276.8
# 5 267.8
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27ΛAl and 28
ΛSi: excitation spectra27ΛAl and 28
ΛSi: excitation spectra
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2 production mechanisms:1) strangeness + double charge exchange
K- + p → Λ + π0
→ π0 + p → n + π+
π- + p → π0 + n→ π0 + p → K+ + Λ
2) Strangeness exchange with Λ-Σ couplingK- + p → Σ- + π+
→ Σ- + p → Λ + nπ- + p → Σ- + K+
→ Σ- + p → Λ + n
neutron-rich hypernucleineutron-rich hypernuclei
12C
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neutron-rich hypernucleineutron-rich hypernucleipr
elimina
ry
preli
minary
+Λ
− +→+ πBeCK 12stop
12
+Λ
− +→+ πHLiK 6stop
6
+Λ
− +→+ πHLiK 7stop
7
++ ±=ππ
σ p2MeV4246p c/.
++ ±=ππ
σ p2MeV1249p c/.
++ ±=ππ
σ p2MeV9262p c/.
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Upper limit for NRH formation probabiltyUpper limit for NRH formation probabilty
3.14.16.5
4.96.69.4
dE/dxPID
3 σ C.L.
2.53.55.6
4.05.68.3
dE/dx + TOFPID
12ΛBe6ΛH
7ΛH
12ΛBe6ΛH
7ΛH
1.62.23.5
2.02.64.1
1.31.82.8
1.62.13.3
NominalMomentumResolution(0.35%)
2.63.65.3
3.24.36.1
2.12.94.3
2.63.54.9
PresentMomentumResolution(0.9%)
dE/dx + TOFPID
dE/dxPID
dE/dx + TOFPID
dE/dxPID
2 σ C. L.90% C.L.PNRHUPPER LIMIT
(· 10-5)
Uncertainties dominated by the error on the μ+ time gate
efficiency (≈ 10%)
Uncertainties dominated by the error on the μ+ time gate
efficiency (≈ 10%)
KEK result for 12ΛBe:
6.1ï10-5 (90% C.L., no error given)KEK result for 12
ΛBe:6.1ï10-5 (90% C.L., no error given)
PRELIMINARY
PRELIMINARY
new resultsnew results
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4He + π - spectr. (102/pb-1) calibration
ppHΛ 4 ++
npHeΛ 4 ++d + d spectr. (∼0.3/pb-1 if B.R. ∼10-3)p + 3H spectr. (0.2/ pb-1 if B.R. ∼10-3) π+ + n + 3H many events (∼ 102/pb-1)how distinguishable?
pHeΛ 5 +
Γπ− about 102/pb-1
τΓp (in coinc.) about 10/pb-1
Γn (in coinc.) a few/pb-1
(rare) decay (rare) decay He4Λ
Spectroscopized
K- + 6Li → π- + Ö
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→ d + d (rare) decay → d + d (rare) decay He4Λ
Κ+
Κ−
Φ
d
d
d
d
μ+
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→ d + d (rare) decay → d + d (rare) decay He4Λ
events with two positivetracks from 6Li targetswith momentum > 400
MeV/c
events with two positivetracks from 6Li targetswith momentum > 400
MeV/c
azimuthal angle differenceazimuthal angle difference
candidates 4ΛHe ó >d+dcandidates 4
ΛHe ó >d+d
interesting events tobe recognized4ΛHe ó >d+d
4ΛHe ó >d+p+n
interesting events tobe recognized4ΛHe ó >d+d
4ΛHe ó >d+p+n
accurate backtracking and kinematic analysis neededaccurate backtracking and kinematic analysis needed
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NM proton stimulated decay NM proton stimulated decay
-3.3 < BΛ < 5.6 MeV-3.3 < BΛ < 5.6 MeV7Li12C -1.8 < BΛ < 11.0 MeV-1.8 < BΛ < 11.0 MeV
27Al -1.2 < BΛ < 16.8 MeV-1.2 < BΛ < 16.8 MeV 51V -0.2 < BΛ < 20.2 MeV-0.2 < BΛ < 20.2 MeV
preliminary,not correctedfor acceptance
preliminary,not correctedfor acceptance
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K-pp state: theoretical calculations K-pp state: theoretical calculations
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Kaonic nuclei search with Λ taggingKaonic nuclei search with Λ tagging
• Missing-mass spectroscopy– Example:
– A kaonic nucleus emits a hyperon in its decay.
• Invariant-mass spectroscopy– Example:
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Λ momentum distribution and back-to-back correlations
Λ momentum distribution and back-to-back correlations
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Before / after acceptance correction (fit 2) Before / after acceptance correction (fit 2)
Very preliminary !!(systematic error to be added)
Contribution from Σ0+p decay are seen in low mass region
No other background exists !
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K- 6Li ⇒ p X inclusive spectrum K- 6Li ⇒ p X inclusive spectrum
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K- 12C ⇒ p X inclusive spectrum K- 12C ⇒ p X inclusive spectrum
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Some preliminary data: 6Li Some preliminary data: 6Li
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Some preliminary data: 7Li Some preliminary data: 7Li
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Some preliminary data: 12C Some preliminary data: 12C
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Some preliminary data Some preliminary data
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Summary Summary First data taking period successfully carried out (30 × 106 events on tape)
Preliminary and partial results on spectroscopyare competitive with world published data
Experimental upper limit for the NRH production:✔ better than published one for Λ12Be✔ measured for the first time for Λ6H and Λ7H
First observation ofΛ4He non mesonic (rare) decay
Observation of K-pp bound state
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Short term plans Short term plans Next data-taking period scheduled in the 2nd half of 2005
v effort focused on light-medium targets (6Li, 7Li, 9Be, 16O, …)
Increase by a factor 4 of the DAQ rate
Replacement of the internal TOF detector (KEK)
Improvement of the reconstruction program☛ geometrical alignment☛ detector calibration☛ pattern recognition strategy☛ selection criteria
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Long term plans Long term plans
Geometrical acceptancereduced to 72%
Geometrical acceptancereduced to 72%
The Segmented Clover DetectorThe Segmented Clover Detector
BGO Comptonsuppression shield
Ge crystals
active collimator(scintillator)
L ≈ 1034 cm-2s-1
L ≈ 1034 cm-2s-1
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(K -, p, p) invariant mass (K -, p, p) invariant mass
Σ0p Λp
mp+ mp+ mK-
Cos(ϑΛp) < - 0.86