E325 H. Enyo
Study of Chiral Property of Dense Nuclear Matter through Measurement ofMeson Mass Modification in Medium
SubmittedApproved
Beam line
Shift requested
Shift executed
Executed cycles

1994.2.17, extension 2001.12.25
1995.3.14, extension
EP1-B
360+80447(96[4], 97[1,2-1]), 97[2-2,4-3], 98[1,2], 99[2-3], 00[2-3,6],01[4-1,4-2,5,6-1]

Papers and activities[Legend]
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Physics papers published in refereed journalTechnical papers
PhD theses
Conference and SymposiumInternal Report and others

K. Ozawa et al.
Observation of ρ/ω Meson Modification in Nuclear Matter
Phys. Rev. Lett. 86 (2001) 5019-5022.
M. Naruki et al.
Experimental signature of medium modifications for ρ and ω mesons in 12 GeV p + A reaction
Phys. Rev. Lett. 96 (2006) 092301-1.
T. Tabaru et al.
Nuclear mass number dependence of inclusive production of ω and ϕ mesons in 12-GeV p + A
collisions
Phys. Rev. C74 (2006) 025201
R. Muto et al
Evidence for in-medium modification of phi meson at normal nuclear density
Phys. Rev. Lett. 98, 042501 (2007)
F. Sakuma et al.
Nuclear-matter modification of decay widths in ϕ → e+ e- and ϕ → K+K- channels.
Phys. Rev. Lett. 98, 152302 (2007)
M. Ishino et al.
Mass production of hydrophobic silica aerogel and readout optics of Čerenkov light
Nucl. Instrum. Meth. A457 (2001) 581-587.
M. Sekimoto et alSpectrometer for measurements of ϕ mesons in nuclear matter produced through 12-GeV p+Areactions
Nucl. Instr. Meth. A516 (2004) 390-405.
S. Yokkaichi
Study of Nuclear Dependence of Production and Decay of ϕ meson in 12-GeV p+A interaction.
Kyoto University, March 2000.
M. Ishino
Study of nuclear–matter effect on K+K– invariant mass measured in 12-GeV p+A interaction.
Kyoto University, September 2000.
K. Ozawa________________________________________________________________________● Physics papers published in refereed journal.
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Technical papers.
PhD theses.
Conference and Symposium.
Internal Report and others.

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Observation of ρ/ω Meson Modification in Nuclear Matter
Kyoto University, 2002.
M. Sekimoto
Development of Spectrometers for High-Energy Nuclear Studies
Tokyo University of Science, March 2003
M. Naruki
Experimental signature of medium modifications for ρ and ω mesons in 12 GeV p+A reactions
Kyoto University, March 2006.
T. Tabaru
Production of ω and ϕ mesons in 12-GeV p + A Interaction Measured in e+e- Decay Mode
Kyoto University, November 2006
R. MutoEvidence for in-medium modification of the ϕ meson at normal nuclear density
Kyoto University, March, 2007
F. Sakuma
Nuclear-matter modification of decay widths in the ϕ → e+ e- and ϕ → K+K- channels
studied in 12GeV p+A reactions
Kyoto University, May 2007
H. En'yo
ϕ Decay in Nuclear Matter
Proc. U.S.-Japan Seminar “Properties & Interactions of Hyperons”, October 25-28, 1993, Maui
Hawaii, World Scientific, Edited by B.F. Gibson, P.D. Barnes and K.Nakai (1994) p.237
S. Yokkaichi et al.
MEASUREMENTS OF ϕ MESON DECAYS IN NUCLEAR MATTER AT KEK-PS
13th International Conference on Ultra-relativistic Nucleus-Nucleus Collisions (Quark Matter 97),
Tsukuba, Japan, 1-5 Dec 1997. Nucl. Phys. A638 435-438, 1998.
K. Ozawa et al.
Measurements of Nuclear Media Modification on ϕ→e+e- Decays at KEK-PS
Contribution paper at Int'l Workshop e+e- Collisions From ϕ to J/ψ, Novosibirsk, Russia, March
1-5, 1999, Proceedings 174-176 edited by G.V.Fedotovich and S.I.Redin
H. En’yo et al.
Nuclear production of ϕ meson at KEK
Proc. of the 2nd KEK-Tanashi International Symposium on "Hadron and Nuclear Physics with
Electromagnetic Probes", KUNS-1637
H. En’yo et al.
Study of Chiral Property of Nuclear Matter through the Measurements of ϕ Meson Decays
Physics of Hadrons and Nuclei, 14-17 December 1998,Sanjo Conference Hall, University ofTokyo, Tokyo, Japan. Nucl. Phys. A670 (2000) 182c.
K. Ozawa et al.
Measurements of Mass Modification of Vector Mesons in Nuclear Matter
YITP Workshop On Possible Existence Of The Sigma Meson And It Implications To Hadron
Physics (Sigma Meson) 2000.6.12-14, published in their proceedings.
S. Yokkaichi et al.
Observation of Meson Modification in Nuclear Matter at KEK-PS
International Nuclear Physics Conference (INPC 2001) 2001.7.30-8.05 Berkeley, CA, USA, AIP
Conf. Proc. 610 (2002) 551-555
H. En’yo et al.
Study of Chiral Property of Nuclear Matter through the Measurements of ϕ Meson Decays
Invited talk at the KEK-Tanashi International Symposium on "Physics of Hadrons and Nuclei",
14-17 December 1998, Sanjo Conference Hall, University of Tokyo, Tokyo, Japan. Published inNucl.Phys.A670 182c-185c, 2000.
K. Ozawa et al.
Modification of Vector Mesons in Nuclear Matter Measured in 12-GeV P + A reactions at________________________________________________________________________● Physics papers published in refereed journal.
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◇＊Technical papers.
PhD theses.
Conference and Symposium.
Internal Report and others.

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International Conference On Ultra relativistic Nucleus-Nucleus Collisions (QM2001)
2001.1.15-20, Stony Brook, N.Y. Published in Nucl.Phys.A698 (2002) 535-538.
Naruki et al.
Measurement of Invariant Mass Spectra of Vector Meson Decaying in Nuclear Matter
Prepared for 16th International Conference on Particles and Nuclei (PANIC 02), Osaka, Japan, 30
Sep - 4 Oct 2002. Published in Nucl. Phys. A721 (2003) 297-300.
H. En’yo et al.
Nuclear Media Effects on Production and Decay of Vector Meson Studied in 12-GeV P + AInteraction
YITP - RCNP Workshop on Chiral Restoration in Nuclear Medium, Kyoto, Japan, 7-9 Oct 2002.
Published in Prog. Theor. Phys. Suppl.149 (2003) 49-55.
R. Muto et al.
Measurement of invariant mass spectra of vector meson decaying in nuclear matter at KEK-PS.
8th Conference On The Intersections Of Particle And Nuclear Physics (CIPANP 2003) 19-24
May 2003, New York. Published in AIP Conf.Proc.698:138-141,2004
R. Muto et al.
Experimental Signature of in-medium mass modification of vector mesons at normal nuclear
density
Quark Matter 2004, The 17th International Conference on Ultra-Relativistic Nucleus-Nucleus
Collisions, Oakland, Janualy 11-17, 2004, Published in J. Phys. G 30(2004) S1023-1026
R. Muto et al.
First observation of phi meson mass-modification in nuclear medium (KEK-PS E325)
Quark Matter 2005, The 18th International Conference on Ultra-Relativistic Nucleus-Nucleus
Collisions, August 4 - 9, 2005, Budapest, Hungary, Published in Nucl.Phys.A774(2006)723
S. Yokkaichi et al.
Vector meson spectrum measrued in 12GeV p+A reaction at KEK-PS
YITP Workshop 'Hadrons in finite density' (HFD06), Kyoto, Japan, February 20-22, 2006,
Published in Soryushiron Kenkyu(Kyoto) 114(2006)B7-12
M. Naruki et al.
Medium modifications on vector mesons in 12GeV p+A reactions
CIPANP2006, Conference on the Intersections of Particle and Nuclear Physics, Westin Rio Mar
Beach. Puerto Rico May 30-June 3, 2006, Published in AIP Conf.Proc. 870(2006) 503
S. Yokkaichi et al.
Medium modification of vector mesons in 12-GeV p+A reactions at KEK-PSMESON2006, 9-th International Workshop on Meson Production, Properties and Interaction,Krakow, Poland, 9 - 13 June 2006, Published in Intl.J.Mod.Phys. A22(2007)397
M. Naruki et al.
Medium modification on vector mesons in 12GeV p + A reactions
Quark Matter 2006, The 19th International Conference on Ultra-Relativistic Nucleus-Nucleus
Collisions, November 14-20, 2006, Shanghai, China, Published in J.Phys.G.34(2006) S1059-1063
R.Muto et al.
Evidence of rho, omega and phi meson mass modification in nuclear medium measured in 12
GeV p+A reaction at KEK-PS E325
International Nuclear Physics Conference (INPC2007), Tokyo, Japan, June 3-8, 2007
H. En’yoLepton pair production.
International Workshop on JHF Science (JHF98), March 4-7, 1998, High Energy Accelerator
Research Organization (KEK), Tsukuba, Japan.
H. En’yoNuclear Matter Probed with ϕ Meson - exploring the lost symmetry –Lecture at 10th RIKEN Winter School on Nuclear Physics with Electromagnetic Probes at
RIKEN RI-Beam Factory - Unstable Nuclei and Hadrons -, Hotel Blanc, Higashi Naruse-mura,________________________________________________________________________● Physics papers published in refereed journal.
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Technical papers.
PhD theses.
Conference and Symposium.
Internal Report and others.

＊＊＊Akita, Japan January 9-14, 2000.
S.Yokkaichi
Study of Nuclear Dependence of Production and Decay of ϕ meson in 12-GeV p + A Interaction
Memoirs of the Faculty of Science, Kyoto University, Series of Physics, Astrophysics,Geophysics and Chemistry, 41(2000)181
M.Ishino
Low Mass Enhancement of K+K- Invariant Mass Measured in 12-GeV p + A Reactions
Memoirs of the Faculty of Science, Kyoto University, Series of Physics, Astrophysics,Geophysics and Chemistry, 42(2001)1
H. En’yo
Measurements of in-medium decay of vector mesons at KEK-PS
Invited talk at Hawaii 2001, First Joint Meeting of the Nuclear Physics of APS and JPS, October
17-20, 2001, Wailea, Maui, Hawaii.

________________________________________________________________________● Physics papers published in refereed journal.
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Technical papers.
PhD theses.
Conference and Symposium.
Internal Report and others.