今井憲一 - KEK

KEK-PSからJ-PARCへ
（核物理の発展）
Kenichi Imai (Kyoto Univ.)
• KEK-PS： ２０世紀から２１世紀への原子核
ハドロン物理
成果と人物往来
• J-PARCでの核物理の期待
Day-1実験とその後
核物理の拠点
• 1960~
東大核研FMサイクロ, 各大学の小型加速器
• 1975~
阪大核物理センター
• 1985~
KEK-PS、理研、AGS-SPS-RHIC
核物理とKEK-PS
(第二期（TRISTAN時代）のはじめ）
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Booster
muon(山崎、永嶺）
(neutron)
• 12GeV 偏極ビームの加速
重イオンの加速
中高エネルギー核物理（ハイパー核）
-> 陽子加速器の大強度化
KAON Factory （大強度陽子加速器）の計画（米、加）
‐＞ 関西K-factory計画
ー＞ 大強度陽子加速器を東大核研（核物理）の将来計画とする。
JHP -> J-PARC
偏極陽子の加速プロジェクト
Beam trajectory in the Snake
RHIC Spin Collider
acceleration and collision of spin polarized protons
origin of proton spin (gluon spin polarization?)
RHIC pC Polarimeters
Lmax = 2 !1032 s "1cm "2
BRAHMS & PP2PP (p)
Absolute Polarimeter (H jet)
70% Polarization
PHENIX (p)
s = 50 K 500 GeV
STAR (p)
Spin Rotators
Partial Siberian Snake
LINAC
BOOSTER
Pol. Proton Source
500 µA, 300 µs
200 MeV Polarimeter
Siberian Snakes
2 × 1011 Pol. Protons / Bunch
ε = 20 π mm mrad
AGS
AGS Internal Polarimeter
Rf Dipoles
Nuclear and Hadronic Physics at
KEK-PS (1998~2005)
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E325 延與
E373 中澤
E419 田村
E438 野海
E443 執行
E452 中井
E462 応田
E471 岩崎
E508 H.C.Bhang
E509 谷田
E519 田村
E521 福田
E522 今井
E548 岸本
E549 岩崎
E559 今井
Nuclear Chart with
Strangeness
35
3000/7000
Textbook example of
Single-particle orbits in nucleus
hypernuclear structure
Single-particle orbit in
deep inside nuclei !
Weak potenatial
~30 MeV
Spin isospin
dependence?
ΣN,ΞN,ΛΛ ?
Hotchi et al., PRC 64 (2001) 044302
High-precision γ spectroscopy with Hyperball
News of the week
Science 291, 9 March 2001
Phys.Rev.Lett. 84 (2000) 5963
Phys.Rev.Lett. 86 (2001) 1982
Phys.Rev.Lett. 88 (2002) 082501
Revised
Highlights of E930 results:
Observation of “Hypernuclear Fine Structure”
9Be
(K-, π- γ) 9ΛBe
16O
43±5 keV
Eγ
(K-, π- γ) 16ΛO
26.1±2.0 keV
(keV)
Eγ (keV)
MeV
MeV
Akikawa et al.,
PRL 88 (2002) 082501;
Tamura et al.,
proc. HYP03 conf.
ΛN spin-orbit force: SΛ = -0.01 MeV
= Consistent with a quark model
Ukai et al.,
proc. HYP03 conf.,
to be published.
ΛN tensor force: T = 0.03 MeV
= Consistent with meson-exchange models
Present status of hypernuclear γ
spectroscopy
-> “Table of hyper-isotopes”
Hybrid Emulsion Method (KEK E373)
Automatic scanning
Discovery of Lambpha
H.Takahashi et al.,
Phys. Rev. Lett.87 (2001) 212502.
->
ΛΛ interaction is weak
attractive
Kaonic Hydrogen
KpX (E228) experiment (岩崎）
PRL 78 (1997) 3067-3069
Result of E471 Proton Spectrum
(K-4He -> p +X)
T. Suzuki et al. : PLB 597 (2004) 263-269
!
・distinct in proton
・semi-inclusive !
・very narrow width
Strange tribaryon
S0(3115)
P3
BG
+
Gaussian
χ2/DOF
=
8.76/12
Gaussian
center:
3117.7
MeV/c2
Gaussian
sigma:
8.7
MeV/c2
Statistical
significance:
S/ΔS
=
2441/297=
8.2
σ
6
Chiral symmetry restoration
in nuclear matter
ρ, ω
Large mass modification
~130MeV/c2 at ρ = ρ0
Large cross section
predictions of density
dependence of vector meson
mass
Hatsuda & Lee PRC46(1992)R34
Detector Setup E325
Hodoscope
Forward LG Calorimeter
Aerogel Cherenkov
Rear LG Calorimeter
Forward TOF
Side LG Calorimeter
Barrel Drift Chamber
B
Cylindrical DC
V
e
G
n
o
t
o
pr
am
e
b
12
Vertex Drift chamber
Rear Gas Cherenkov
Front Gas Cherenkov
1m
+eInvariant Mass Spectrum
of
e
2
the region 0.60-0.76GeV/c is excluded from the fit.
C
ωe+e-
χ2/dof=163/140
(8%)
φ  e +e-
Cu
ωe+e-
χ2/dof=156/140
(16%)
φ  e +e-
the excess over the known hadronic sources on the low
mass side of ω peak has been observed.
Invariant Mass Spectrum of e+e- (background subtracted)
the region 0.60-0.76 GeV/c2 is excluded from the fit.
C
Cu
ρ/ω ratio is consistent with zero
Νρ/Νω=0.0±0.02(stat.)±0.2(sys.)
0.0±0.04(stat.)±0.3(sys.)
It is pretty much surprising because the ρ/ω is known to be unity
in pp interactions (Blobel et. al, PLB48(’74)73 )
Pentaquark Θ+
at SPring-8 LEPS
Μ = 1540±10 MeV
Γ < 25 MeV
Gaussian significance 4.6σ
background
T. Nakano et al.,
Phys.Rev.Lett. 91 (2003) 012002
Pentaquark search with π- and K+
beams at KEK-PS
Preliminary result of E522
π-+p -> K-+(Θ+)
2.6σ statistical fluctuation?
preliminary
Simulated spectrum for
K++p -> π++Θ+
High resolution experiment
is now being done as E559
World Proton Accelerators
Beam
current (µA)
10000
ESS
PSI
1000
plan
物質・生命科学
研究 ＋ 核変換工学
construction
( 但しＣＷ)SNS
ISIS
TRIUMF
100
JPARC
3GeV
パワー
JPARC:
50 GeV
IPNS
J-PARC
0.1 to 1 MW
operation
素粒子・
原子核研究
10
AGS
KEK-500MeV
Booster
CERN-PS
1
FNAL-MI
1 MW
SPS
0.1 MW
KEK12 GeV PS U70
0.1
Tevatron
0.01
0.1
1
10
100
1000
10000
Energy (GeV)
Switch Yard for Hadron Hall
Letters of Intent for 50 GeV
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Thirty LoI’s submitted by 2003
– Strangeness nuclear physics
7
– Nuclear/hadron physics 7
– Kaon decay physics
4
– Muon physics
3
– Neutrino physics
1
– Future facilities
8
Nuclear/Particle Facility LOI Authors
Total #
= 478
Europe
Japan
North America
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478 physicists with 2/3 from outside
Japan.
Call for proposals: 2006.4
Asia
LOI New Generation Spectroscopy of
Hadron Many-body Systems
with Strangeness S=-2 and -1
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K.Imai,M.Nakamura, H.Funahashi, M.Yosoi
T.Nagae, M.Ieiri, H.Noumi, H.Outa, M.Sekimoto,
H.Takahashi, Y.Sato, A.Toyoda
T.Fukuda, P.K.Saha
K.Nakazawa
K.Yamamoto, T.Yoshida
O.Hashimoto, K.Maeda, H.Tamura, S.N.Nakamura,
T.Takahashi, Y.Fujii,H.Kanda
T.Kishimoto, A.Sakaguchi, S.Ajimura, Y.Shimizu,
S.Minami, T.Itahashi, T.Hayakawa
M.Iwasaki, K.Itahashi, K.Tanida, Y.Matsuda
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Japan
J.S.Song, I.G.Park, C.S.Yoon, S.H.Kim
J.Y.Kim
M.Y.Pac
J.K.Ahn, I.K.Yoo
H.Bhang, M.Youn
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Korea
S.Zhou, L.Zhu
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China
Day-1
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B.Bassalleck
L.Tang
P.Markowitz, B.Raue, J.Reinhold
M.May, R.E.Chrien, A.Rusek, P.H.Pile
S.Choi
Ed.Hungerford
G.Franklin, R.Schumacher, B.Quinn
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USA
T.R.Saitoh, A.Banu
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Germany
J.Arvieux
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France
P.Kienle, M.Cargnelli, J.Marton, J.Zmeskal
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Austria
S.Marcello, T.Bressani
M.Agnello
A.Feliciello
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Italy
P.Tlusty
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Czech
Initial Program of Strangeness Nuclear Physics
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Spectroscopy of Ξ-hypernuclei
Spectroscopy of double-Λ hypernuclei
Hypernuclear γ-spectroscopy with Hyperball-III
High-resolution spectroscopy of Λ-hypernuclei
ΔE=200keV
• Hyperon-proton scattering experiments
Λ-p, Σ-p, Ξ-p
• Search for deeply-bound Kaonic nuclear states
Layout Option - K1.8 and K1.1 for day-1 experiments
SKS
K1.8
IF
MS1
MS2
K1.1
T1 TGT
MS1
MS2
SPES-II