Radiation Laboratory

| RIKEN Home | NishinaCenter | RadLab | CCJ ||| BNL | RHIC | PHENIX | PHENIX-PWG ||| RBRC | RIKEN@BNL | RHIC-Spin |
| Nishina-RIBF ||| KEK | E325 ||| Kyoto-U | TITech | U-Tokyo | CNS | Rikkyo－U | Hiroshima-U | Niigata-U |

Radiation Laboratory
last update, 02-April-2007

Location	Room 254/256, in the Main Research Building at RIKEN, Wako
Address	Radiation Lab, RIKEN, 2-1 Hirosawa, Wako, Saitama, Japan
Telephone	+81-48-467-9347
`Fax`	+81-48-462-4641

Two new snake magnets in AGS improved the proton polarization in RHIC, to above 60%..

Welcome to our home page. The Radiation Laboratory is one of the eldest research group in RIKEN. From 1st of April 06, we become a member of Nishina Center for Accelerator-Based Science, which is newly established in RIKEN to unify all the scientific activities using heavy-ions and proton accelerators, domestic and abroad. The major activity of Radiation Laboratory is to perform an experiment using high-energy polarized-proton collisions and heavy-ion collisions at BNL-RHIC, USA. We are also performing ion source developments and novel detector developments. We recently inherited activities on neutron optics and super conducting tunnel junction detectors from Image Information Research Unit in RIKEN.
Seminar Schedule

***Our Activities***
*Spin Physics at BNL*	*Spin Physics at Wako*	*Theory*	*Mesons in Nucleus*
How the spin of proton is formed with 3 quarks and gluons? This is a very fundament question in QCD, Quantum Chromodynamic. The RHIC Spin Project has been established to solve this problem by colliding two polarized protons for the first time in history. Collisions of polarized protons are measured with the PHENIX detector at RHIC. Research program is organized in PHENIX Spin Physics Working Group. Collaboration with accelerator group, theorists, and other RHIC experiments is the key for the success of the program. The RBRC experimental group is conducting RSC, Rhic Spin Collaboration.	Analysis of the PHENIX data is performed at CCJ with over 500 CPUs with 1 peta-byte storage. This CPU farm is combined with new RIKEN super computer cluster, and serves as the major analysis center for PHENIX. Asymmetry of neutral pion production, sensitive to gluon's spin direction	Theory group in Radiation Laboratory is to study theoretical aspects of physics at RHIC. The group is conducted by K. Yazaki, keeping close relation to the theoretical group in RBRC Asymmetry Analysis Collaboration is compiling and modeling the world-wide data of the nucleon structure functions; Recent RHIC data largely limits the range of gluon polarization in proton.	While RHIC creates nuclear matter with high temperature, study of dense nuclear matter is being performed at KEK using 12GeV Proton Cyclotron, by measuring the decays of vector mesons in nucleus. Evidence of phi meson modification at normal nuclear density.
*Heavy Ion Physics at BNL*	*PHENIX Detector Upgrade*	*Laser Ion Source*	*Neutrons, optics and detection*
At RHIC QGP, Quark Gluon Plasma, should be created by colliding two gold nuclei, through which we can study the state of early Universe just after the Big Bang. Our recent discoveries are summarized in Nucl. Phys. A757: 184-283, 2005 which announces "formation of a new state of dense matter.". Displaying thousands of particles created after a collision.	To enhance physics capability of PHENIX even further, PHENIX Detector Upgrade R&D is on going through the collaboration with BNL instrumentation division, CERN-ALICE and CERN-NA60. Checking pixel detectors	Laser induced plasma ion source has been developed, which ejects the world highest intensity of carbon and aluminum beam. This method is so compact and can be useful for cancer therapy. RFQ used for the ion source	By combining novel methods for neutron optics with super conducting tunnel-junction detector, we aim to perform precise measurements for neutron decays. Applications go also to neutron interference and neutron scattering. Sextupole magnet to focus cold neutron

Members (April 2007)
bold names are recent additions

Old member list(2006)
Old member list(2005)
Old member list(2004)
Old member list(2003)

People Left from Radiation Lab.

Radiation Laboratory　

**Experiment**
	Name	Other Affiliations	Activity	@
Chief Scientist	Hideto Enyo	RBRC	PHENIX,CCJ,KEK	W
Vice Chief Scientist	Takashi Ichihara	RBRC,Motobayashi-Lab	PHENIX,CCJ,RIB	W
	Yasuyuki Akiba	RBRC	PHENIX	B
Scientist	Yasushi Watanabe	RBRC	PHENIX,CCJ,RIB	W
	Atsushi Taketani	RBRC	PHENIX	W
	Yoshie Ohtake	Shimuzu Unit	Neutron Optics	W
	Yuji Goto	RBRC	PHENIX	B
	Itaru Nakagawa	RBRC	PHENIX	B
	Hiromi Sato		STJ	W
Collaborating Scientist	Naohito Saito	Kyoto-U, RBRC	PHENIX
	Kazuyoshi Kurita	Rikkyo-U,RBRC	PHENIX
	Takeo Kawasaki	Niigata-U	ALICE
	Kiyoshi Tanida	Kyoto-U	PHENIX
	Hisayuki Torii	Hiroshima-U	PHENIX
	Takuma Horaguchi	Hiroshima-U	PHENIX
Special Postdoctoral Fellow	Yoshinori Fukao		PHENIX	W
	Kenji Mishima		Neutron/STJ	W
	Manabu Togawa		PHENIX	W
Contract Researcher	Satoshi Yokkaichi	RBRC	PHENIX,CCJ	W
	Souichiro Kametani		PHENIX,CCJ	W
	Yoshiyuki Onuki		PHENIX	W
	Kazuaki Ikeda	JNOP	Neutron/STJ	W
	Ryo Ichimiya		PHENIX	W
	Maki Kurosawa		PHENIX	W
	Kohei Fujiwara		PHENIX	W
	Masayuki Niiyama		LEPS2	W
Entrustee	Katsuya Hirota	JNOP	Neutron/STJ	W
Senior Visiting Scientist	Ken Imai	Kyoto-U	PHENIX
	ToshiAki Shibata	TITech	PHENIX
	Hirohiko Shimizu	KEK	Netron/STJ
Students	Kazuya Aoki	Kyoto-U,JRA	PHENIX	B
	Kohei Syoji	Kyoto-U,JRA	PHENIX	B
	Ken'ichi Nakano	T.I.Tech,JRA	PHENIX	W
	Koichi Sakashita	T.I.Tech,SPT	PHENIX	W
	Takashi Kanesue	Kyusyu-U,Trainee	NIRS	B
	Jun Tamura	T.I.Tech,JRA	NIRS	B
	Yoshichika Seki	Kyoto-U, JRA	Netron	W
	TadaAki Isobe	CNS-U-Tokyo, JRA	PHENIX	B
	Yorito Tamaguchi	CNS-U-Tokyo, JRA	PHENIX	B
	Misaki Ouchida	Hiroshima-U,JRA	PHENIX	B
	Kentaro Miki	Tsukuba-U,JRA	PHENIX	B
	Yasuhiro Minamikawa	U-Tokyo,JRA	STJ	W
	Kenichi Karatsu	Kyoto-U	PHENIX	B
	Seiji Dairaku	Kyoto-U, JSPS	PHENIX	B

**Theory**
	Name	Other Affiliation	@
Senior Visiting Researcher	Koichi Yazaki	T.W.U	W
Contract Researcher	Hiroyuki Kawamura		W
	Marco Stratman	starting in August	W
Students	Koichi Hashimoto	Kanazawa-U.	B
	Satoru Ueda	Tsukuba-U	B

**Secretaries**
	Noriko Kiyama
	Karen Sakuma

RIKEN-BNL Research Center

**Directors**
	Name	Other Affiliation	@
Center Director	Nick Samios	BNL	B
Director Emeritus	T.D. Lee	Columbia U.	B
Associate Director	Hideto Enyo	Radiation Lab	W

**Experiment**
	Name	Other Affiliation
Group Leader	Hideto En'yo	RIKEN
Deputy Group Leader	Gerry Bunce	BNL
RHIC Fellow	Matthias G. Perdekamp	U-Illiois
	Abhay L. Deshpande	SUNY
	David Kawall	Yale
Fellow	Kensuke Okada
	Xie Wei
Research Associate	Patricia Liebing
RIKEN Special Postdoctoral Fellow	Nobuyuki Kamihara
Visiting Scientist	Kazu Kurita	Rikkyo -U
	Naohito Saito	Kyoto-U
Collaborating Scientist	Akio Ogawa	BNL
	Zheng Li	BNL
	Alexander Bazilevsky	BNL

**Theory ( Japanese )**
**Other Non-Japanese members can be find here**
	Name	Other Affiliation
Group Leader	L. Mclerran	BNL
Deputy Group Leader	Anthony Baltz	BNL
RHIC Physics Fellow	Taku Izubuchi	Kanazawa-U
	Shin'ya Aoki	Tsukuba-U
Fellow	Yasumichi Aoki	U-Tokyo
Research Associate	Tomomi Ishikawa
RIKEN Special Postdoctoral Fellow	Kenji Fukushima
	Yoshimasa Hidaka
Visiting Scientist	Shigemi Ohta	KEK

**Administration, Secretary**
Office at RBRC	Ryosuke Maruyama
	Rae Greenberg
	Pam Esposito
	Taeko Itoh
	Jane Lysik
Office at Wako	Hiroshi Miyamoto
	Keiko Suzuki