| Radiation
Laboratory last update, 16-April-2009
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 Novel StriPixel Detector, the mass-production prototype, for PHENIX Silicon Vertexl Detector |
| Radiation
Laboratory last update, 16-April-2009
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Novel StriPixel Detector, the mass-production prototype, for PHENIX Silicon Vertexl Detector |
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| 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.  PHENIX
collaboration
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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. Recent analysis on the asymmetry of the neutral pion production has shown that the gluon polarization in proton is surprisingly small, i.e. gluon is less likely the career of proton spin. Natural ansatz from this discovery is existence of significant orbital motion in the proton.
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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.
Very
recently,
enhanced e+e- pair yield above hadronic sources is observed in Au+Au
collisions
at RHIC. The characteristic temperature is determined to be 221 MeV. This will be the key measurement to determine the
nature
of the
hot and dens matter RHIC created.
 Click above to get a preprint |
While RHIC creates nuclear matter with high
temperature, study
of dense nuclear matter was being performed at KEK,
and phi meson modification at normal nuclear density was discovered as
shown below.
 Click above to get a preprint
 Click above to get the proposal |
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| Theory group in Radiation Laboratory is studying
theoretical
aspects of physics at RHIC. Our global analysis for world-wide
asymmetry
data showed the gluon polarization in proton is strongly
constraneted
with recent data from RHIC. .
 Click above to get a preprint |
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.
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Developments of laser-induced plasma ion source is
going as
a collaboration with BNL Accelerator Division. This source ejects the
world
highest intensity of carbon and aluminum beam so far, and will be used
for an ion injector for RHIC. This method is so compact and can
be
useful for cancer therapy as well.
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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.
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Recent Memorial Events
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Hiromi
Okada, former
Junior Research Associate of Radiation Lab., received RHIC
& AGS thesis award 2007. R. Muto, former Special Doctral Fellow
of Radiation Lab., received 2007
Young Scientist Award of the Physical Society of Japan. H En'yo and
S. Yokkaichi received Significant
Achievement Award in RIKEN, March 2008.
 Click
above to go to RIKEN Research Article
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 Five-year MoU between RIKEN and BNL was signed by BNL Director S, Aronson and RIKEN President R. Noyori, Jan. 2007. |
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.
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Old
member list(2008)
Old
member list(2007)
Old
member list(2006)
Old
member list(2005)
Old
member list(2004)
Old
member list(2003)
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Radiation
Laboratory
Experiment
Theory
Secretaries
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RIKEN-BNL
Research Center
Directors
Administration, Secretary
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OUT REACHES ( in Japanese)
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