Part IExecuted Experiments at the KEK 12 GeV PS (1998-2004)
1998

Year

4E471
E521

E325

E362

E362

E452

E362
E391a

E391a

E452

E522

E362
E391a
E522
E546

E443

Slow extraction

Fast extraction

72516-2
6-1

4-3

E417

E471

14-2

E508 E521 E518

104-1

E462

732-2
2-1

E462

4
16-3
6-2
6-1

I
T π2

54-2
4-1
3-2

E438

E373

FY2003
1E509

E325

3-1

E360

10E4702πµE373

7E246

1E373

46-2
6-1

EP K2
2FY2002
1E246

E391aK0102004

2003

4-2
4-1
3-2
3-1

E362

ν

72-2
2-1

E325

41
7-3

E325

16EP1B

2002
FY2001

107-2
7-1

E419

75K641E246

2001
FY2000

12-3
2-2
2-1

104-3

74-2
4-1

43
2

4

3-3
3-2

1E
P
1

FY199913-1

12GeV-PS
OperationCycle

10

2000

2-3

72-2
2-1

4

1
65MonthK5

1999

FY1998

Fiscal Year

Executed Time

KEK 12 GeV PS Operation Statistics in FY2003

Operation Hours

KEK 12 GeV PS Operation Statistics in fiscal years 1994-2003

FISCAL YEAR

Lists of Experiments in 2000-2004
Exp.No.: Spokesperson; Approved shifts; Status
Title of Experiment
E246/E470(T-Violation): J. Imazato; 450/80; Completed
Search for T violation in the K+ → π0µ+ν decay / Measurement of direct photonemission in K+ → π+π0γ
E288/E337/E393(MULTI): T. Murakami; 10/76/72; CompletedTarget Multifragmentation by GeV Energy Proton
E289(SigN): M. Ieiri; 200; Completed
Hyperon-Nucleon Scattering Experiments (2)E307: H. C. Bhang; 120; Completed
Lifetimes and Weak Decay Widths of Light and Medium-Heavy

Hypernuclei

E325(φ) H. En’yo; 360+80; Completed
Study of Chial Property of Dense Nuclear Matter through Measurement of Meson Mass
Modification in Medium
E352: R. J. Petersen; 50; Completed
Quasielastic π Meson Scattering
E360/E546: A. Shinohara: 45/35 ; Completed! Mesonic Hydrogen Atoms / Measurement of Electronic X rays correlated with Pionic
X raysE362(K2K): K. Nishikawa; 1020 protons; Data-Taking
Long Baseline Neutrino Oscillation ExperimentE369: T. Nagae; 100; Completed
Structure of 89ΛY via the (π+, K+) Reaction
E373: K. Nakazawa; 230; CompletedStudy of Double Strange Nuclei by Emulsion-Scintllating fiber Hybrid Methods
E391a: T. Inagaki ; 300; Data-Taking_Measurement of the KL → π0νν Decay
E419: H. Tamura; 70; Completed
Measurement of B(E2) Transition Rate in 7ΛLi Hypernucleus
E438: H. Noumi; 75; Completed
Study of Σ-Nucleus Potential by the (π-, K+) Reaction on Heavy Nuclei
E443(PXN): N. Shigyo; 60; Completed
Neutron-Production Differential Cross Sections in the (p,nx) Reaction at Forward Angle
E452: K. Nakai; 100+100; Completed
Spin-dependent Interactions in Σ+-p Scattering

E462/E508: H. Outa; 65/80; Completed
Exclusive Measurement of the Non-Mesonic Weak Decay of 5 ΛHe / Coincidence
Measurement of the Weak Decay of 12ΛC
E471: M. Iwasaki; 80+40; Completed
Search for Strongly Bound Kaonic Nuclear State
E509: K. Tanida; 40; Completed
γ-ray Spectroscopy of Hyperfragmentas using stopped K- method
E518: H.Tamura; 80; Completed
High-Precision γ Spectroscopy of 11ΛB
E521: T. Fukuda; 40+45; Completed
Production of Neutron-rich L Hypernuclei by the the (π-, K+) Double-charge Exchange
Reaction
E522: K. Imai; 100; CompletedSearch for H-dibaryon Resonance via 12C(K-, K+Λ Λ) and Study of Ξ-N Interactions
E548: T. Kishimoto; 33; Preparation
Study of Kaonic Nuclei by the (K-,p) Reactions/Search for K! Bound State in the Kaon
Induced Reaction
E549: M. Iwasaki; Conditionally Approved; Preparation
Confirmation of Nuclear Kaonic State and Search for its Excited State
E559: K. Imai; Conditionally Approved; Preparation
High Resolution Spectroscopy of Penta-quark Θ+Beam Lines in the E-Hall 2004
[Secondary Beam Lines]
BeamParticlesLineK0KL
K2K+Kπ+π̲ pπ2π+ππµπ+πT1π+π[Primary Beam Line]
BeamParticles
LineP1pol.ppdnMomentum
Range (GeV/c)
1-81-2Momentum
Bite [Δp/p] (%)±30.5-2±31-4±10.1-0.26±40.5-2±5Energy
Range (GeV)
3.52-12.0
2-11.2
1-5.6

Typical Intensity(particles / 101 2 protons)
3.0×107
5.0×105 @ 2 GeV/c
1.0×105
2.2×107
1.5×107
1.5×104
2.0×105 @ 3 GeV/c
1.0×105
1.2×106 @ 0.23 GeV/c
1.0×106
5.0×104 @ 1 GeV/c
4.0×104

Momentum
Typical Intensity
Spread [ΔE/E] (%) (particles/ sec)
± 0.5
4.0×108 pol. = 40 %4.0×1082.0×108
4.0×108

Beam Lines in the N-Hall 2004
[Secondary Beam Lines]
BeamParticles
LineK5K+Kπ+π̲ pK6K+Kπ+π̲ p[Primary Beam Line]
BeamParticles
Line
EP1B
pdMomentum
Range (GeV/c)
0.3-0.6

Momentum
Bite [Δp/p] (%)±3

Typical Intensity(particles / 101 2 protons)
5.0×104 @ 0.55 GeV/c
1.0×104
3.5×107
2.8×107
2.6×1028.7×103 @ 1 GeV/c
3.3×103
6.5×106
5.0×106
1.6×1030.5-2± 2.8

EnergyRange (GeV)
2-12.02-11.2

Momentum
Typical Intensity
Spread [ΔE/E] (%) (particles/ sec)
4.0×1082.0×108

Neutrino Beam Line for Long Baseline Oscilation Experiment• 12 GeV fast extracted proton beam
• Proton on target
6.0×101 2 /pulse• Magnetic Horn system & 200-m long decay volume

Layout of Experimental Areas in September 2000
to Kamioka

Frontdetectorνµ

Neutrino beam line

Experiments in fiscal year 2000
Exp. Beam
No. Line

Title of Experiment

E246 K5Search for T violation in the K+ → π0µ+ν decay
E325 EP1B Study of Chiral Property of Dense Nuclear Matter ThroughMeasurements of Meson Mass Modification in Medium
E362 ν-BL Long Baseline Neutrino Oscillation ExperimentE373 K2
Study of S=-2 Nuclei by Emulsion-Scintillating Fiber
Hybrid Method
0E391aK0
Study of the KL→π νν-bar Decay
E443 π2
E452 K2
Spin-dependent Interaction in Σ+-p Scattering
E462 K6
Exclusive Measurement of Nonmesonic Weak Decay of 5ΛHeNorthCounterHallK6K5EP1-B

East Counter Hall
πµEP2EP1ITT112-GeV PS

π20K2K0100 mLayout of Experimental Areas in September 2001
to Kamioka

Frontdetector

νµNeutrino beam line

Experiments in fiscal year 2001
Exp. Beam
No. LineTitle of Experiment

NorthCounterHallK6K5EP1-B

East Counter Hall
πµEP2
E325 EP1B Study of Chiral Property of Dense Nuclear Matter ThroughMeasurements of Meson Mass Modification in Medium
E362 ν-BL Long Baseline Neutrino Oscillation ExperimentE391aK0
Study of the KL→π0νν-bar Decay
E452 K2
Spin-dependent Interaction in Σ+-p Scattering
E462 K6
Exclusive Measurement of Nonmesonic Weak Decay of 5ΛHeE470 K5Measurement of direct photon emission in K+ →π+π0γEP1ITT112-GeV PS

π20K2K0100 m

Layout of Experimental Areas in September 2002
to Kamioka

Frontdetector

νµNeutrino beam lineExperiments in fiscal year 2002
Exp. Beam
No. Line
E362 ν-BL
E391aK0
E471 K5
E508 K6
E509 K5
E518 K6
E521 K6
E522 K2

Title of ExperimentLong Baseline Neutrino Oscillation Experiment
Study of the KL→π0νν-bar Decay
A Search for Deeply Bound Kaonic Nuclear StateCoincidence Measurement of the Weak Decay of C
γ-ray spectroscopy of hyperfragments using stopped K- method
γ-ray spectroscopy of 11ΛB
Production of neutron-rich Λ hypernuclei by the(π-,K+)
double-charge exchange reaction
Search for H-dibaryon resonance via 12C(K-,K+) andStudy of Ξ-N interactions

NorthCounterHallK6

K5EP1-B

East Counter Hall
πµEP2EP1ITT112-GeV PS

π20K2

K0100 mLayout of Experimental Areas in September 2003
to Kamioka

Frontdetector

νµNeutrino beam line

Experiments in fiscal year 2003
Exp. Beam
No. LineE362 ν-BLE391aK0E471 K5E521 K6
E522 K2
E546 πµTitle of ExperimentLong Baseline Neutrino Oscillation Experiment
Study of the KL→π0νν-bar Decay
A Search for Deeply Bound Kaonic Nuclear State
Production of neutron-rich Λ hypernuclei by the(π-,K+)
double-charge exchange reaction
Search for H-dibaryon resonance via 12C(K-,K+) andstudy of Ξ-N interactions
Measurements of Electronic X rays correlatedwith Pionic X rays

NorthCounterHallK6K5

EP1-B

East Counter Hall
πµEP2EP1ITT112-GeV PS

π20K2K0FFAG100 m