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Radiation Laboratory

last update, 16-June-2010


Location

Room 254/256, in the Main Research Building at RIKEN, Wako

Address 

Radiation Lab, RIKEN, 2-1 Hirosawa, Wako, Saitama, 351-0198, Japan

Telephone 

+81-48-467-9347

FAX

+81-48-462-4641

image002 
PHENIX Vertex Detector is under construction. Pixel ladders are being mounted. The detector will be operational at the end of 2010.

 

Welcome to our home page.  The Radiation Laboratory is one of the eldest research groups in RIKEN, now belonging to Nishina Center for Accelerator-Based Science. The major activity of Radiation Laboratory is to perform an experiment using high-energy polarized-proton collisions and heavy-ion collisions at BNL-RHIC in USA, through cooperation with RIKEN-BNL Research Center. We are also performing ion-source developments and novel detector developments.

 

In October 2009, H. En'yo, Chief Scientist of Radiation Laboratory, was concurrently appointed as the director of RIKEN Nishina Center for Accelerator-Based Science. A. Taketani is now the leader of Nishina RIBF(Radio Isotope Beam Factory) Detector Team, to which major part of PHENIX detector development work is transferred. Our theoretical activity in QCD was transferred to newly-established Mathematical Physics Laboratory.  


Spin Physics at RHIC

 

Heavy Ion Physics at BNL

  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

image004

PHENIX collaboration

Research program is organized in PHENIX Spin Physics Working Group, and  analysis of the PHENIX data is performed at CCJ combined with RIKEN super computer cluster.


  Recently, we have successfully detected the signal from W boson decaying into electron. W boson provides us the key tool to determine anti-quark polarization in the proton.

 image006
Signal of W boson decayed to electron

 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. 

  February 2010, Y. Akiba has reported, at American Physics Society Meeting, the temperature of QGP created at RHIC. We have measured thermal radiation from the hot matter and the temperature was determined to be 400MeV.

image008
Click above to reach the press release

Mesons in Nuclear Matter

PHENIX Detector Upgrade 

Neutrons, optics and detection

   While RHIC creates nuclear matter with high temperature, study of dense nuclear matter was being performed at KEK-PS, and phi meson modification at normal nuclear density was discovered.

 To extend our research further we proposed a new experiment E-16 to be done at J-PARC. The grant-in-aid budget "New Hadrons" from JSPS was granted for 4 years to build the detector.

PhiBall
The schematic view of the new detector. Click above to get the proposal

To enhance physics capability of PHENIX even further, PHENIX Detector Upgrade is ongoing. Major activities are in the constrictions of Silicon Micro Vertex Detector and Muon Trigger Upgrade. Both are in operation within this year

. image010
Schematic drawing of the (half of) PHENIX vertex detector, to appear soon as real.

 Collaborating with RIKEN venture company, JNOP (Japan Neutron OPtics), we are performing experiments of neutron interference and neutron scattering.  

image012

Interference as large as 60% was observed using multilayer neutron mirrors.

image014

Clear separation of neutron paths was firstly achieved.

Recent Memorial Events

Y.Fukao received  2010 Young Scientist Award of Nuclear Physics Forum of Japan with his work in determining the gluon polarization in proton.

image016

The data which eliminated most of theoretical models which assume large gluon polarization.

H. Iinuma, former Junior Research Associate of Radiation Lab., received 2010 Young Scientist Award of the Physical Society of Japan. She was also the winner of RHIC & AGS thesis award in 2007.

image018

The gas jet target which determined the absolute value of the proton polarization at RHIC

R. Muto, former Special Doctral Fellow of Radiation Lab., received 2008 Young Scientist Award of the Physical Society of Japan.  H En'yo and S. Yokkaichi received Significant Achievement Award in RIKEN, March 2008.

The signal of the phi-meson mass modification in nuclear matter. Click above to get a preprint

  T. D. Lee, Director emeritus of RIKEN BNL Research Center  has awarded for The Order of the Rising Sun, Gold and Silver Star (旭日重光章), Jan. 2007.



Members (April 2010)
bold names are recent additions

Old member list(2009)
Old member list(2008)
Old member list(2007)
Old member list(2006)
Old member list(2005)
Old member list(2004)
Old member list(2003)

People Left from Radiation Lab.

 

 

Radiation Laboratory

 

Name

Other 
Affiliations

Activity

@

Chief Scientist

Hideto Enyo

Director, Nishina Center

PHENIX,JPARC

W

Vice Chief Scientist

Takashi Ichihara

RBRC, RIBF computing team leader

PHENIX,RIB

W

Yasuyuki Akiba

RBRC Exp. Group Leader

PHENIX

B

Scientist

Yasushi Watanabe

RBRC, RIBF user liaison team sub-leader

PHENIX,RIB

W

Yoshie Ohtake

Neutron Optics

W

Yuji Goto

RBRC

PHENIX

W

Itaru Nakagawa

RBRC

PHENIX

W

Satoshi Yokkaichi

RBRC

PHENIX,JPARC

W

Ralf Seidl

RBRC

PHENIX

W

Collaborating Scientist

Naohito Saito

KEK

PHENIX

Kazuyoshi Kurita

Rikkyo-U

PHENIX

Kiyoshi Tanida

Korea-U

PHENIX

Tsutomu Mibe

KEK

PHENIX

Foreign Postdoctoral Researcher

Stephen Baumgart

 

PHENIX

W

Special Postdoctoral Researcher

Kazuya Aoki

PHENIX/JPARC

W

Yoshichika Seki

Neutron

W

Postdoctoral Researcher

Tomoaki Nakamura

PHENIX

W

Yoshinori Fukao

PHENIX

W

Yohei Nakatsugawa

LEPS

W

Takashi Hachiya

PHENIX

W

Yoshimitsu Imazu

Stating from July

PHENIX

W

Motohiro Nishitani

Electron gun

W

Entrustee

Katsuya Hirota

JNOP 

Neutron/STJ

W

Technical Staff

Junpei Kanaya

PHENIX

W

Senior Visiting Scientist

Tomo Nagae

Kyoto-U

JPARC

ToshiAki Shibata

TITech

PHENIX

Hirohiko Shimizu

KEK

Netron/STJ

Takashi Nakano

Osaka-U, RCNP

LEPS

Students

Takashi Kanesue

Kyusyu-U,JSPS

BNL-CAD

B

Yorito Yamaguchi

CNS-U-Tokyo, StudentPT

PHENIX

B

Kenichi Karatsu

Kyoto-U,JRA

PHENIX

B

Seiji Dairaku

Kyoto-U, Intern

PHENIX

B

Yoki Aramaki

CNS,U-Tokyo, JRA

PHENIX

B

Satoshi Sano

CNS,U-Tokyo, JRA

PHENIX,ALICE

B

Kimiaki Hashimoto

Rikkyo-U, JRA

PHENIX

W

Katsuro Nakamura

Kyoto-U, JSPS

PHENIX

W

Dosatsu Sakata

Tsukuba-U, JRA

PHENIX,ALICE

W

Ryu Sun Yong

Osaka-U, IPA

LEPS

B

Masaya Nihashi

Hiroshima-U,JRA

PHENIX

B

Ryoji Akimoto

CNS,U-Tokyo,JRA

PHENIX

B

Hidemitsu Asano

Kyoto-U,JRA

PHENIX

B

Takahito Todoroki

Tsukuba-U,JRA

PHENIX

B

Yoshimasa Ikeda

Tsukuba-U, Student PT

PHENIX

W

 
Secretaries

Noriko Kiyama

Keiko Suzuki

RIKEN-BNL Research Center

Directors

 

Name

Other 
Affiliation

@

Center Director

Nick Samios

BNL

B

Director Emeritus

T.D. Lee

Columbia U.

B

Associate Director

W

Experiment

 

Name

Other 
Affiliation

Group Leader

Yasuyuki Akiba

RIKEN

Deputy Group Leader

Abhay L. Deshpande

SUNY

RHIC Fellow 

David Kawall

Yale

Fellow

Kensuke Okada

Stefan Bathe

Research Associate

Kieran Boyle

RIKEN Special Postdoctoral Researcher 

Kohei Shoji

Students(JRA)

Akihisa Takahara

CNS, U-tokyo

Collaborating Scientist

Akio Ogawa

BNL

Zheng Li

BNL

Alexander Bazilevsky

BNL

Kotaro Kondo

BNL-CAD

Masahiro Okamura

BNL-CAD

Andy

BNL-CAD

 

Theory ( Japanese member)
Other Non-Japanese members can be found here

 

 

Name

Other 
Affiliation

Group Leader

L. Mclerran

BNL

Deputy Group Leader

Anthony Baltz

BNL

RHIC Physics Fellow

Taku Izubuchi

BNL

Fellow

Yasumichi Aoki

Research Associate

Eigo Shintani

RIKEN Special Postdoctoral Researcher

Toru Kojo

Visiting Scientist

Shigemi Ohta

KEK

Administration, Secretary

Office at RBRC

Emiko Adachi

Secretary

Doris Rueger

Pam Esposito

Taeko Itoh

Susan Foster

Office at Wako

Shigeki Asakawa

Hiroshi Miyamoto

 

 

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