Transcript The UCD Nuclear Physics Group

Experimental
Nuclear Physics at
UC Davis
• FACULTY:
Come visit us on the fifth floor - WEST end
• Jim Draper (emeritus)
• Paul Brady (emeritus)
• Daniel Cebra
• Ramona Vogt
• STAFF:
• Juan Romero
• Tom Gutierrez
• GRAD STUDENTS:
•Roppon Picha (2005)
• UNDERGRADS:
•Nathan Farr
•David Cherney
•Stephen Baumgarten
PS… Check out our web page at http://nuclear.ucdavis.edu
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Daniel Cebra - Physics 295
Recent Graduates
• Ian Johnson (2002) Postdoc LBNL
• Jenn Klay (2001) Postdoc LBNL
• Mike Heffner (2000) Postdoc LLNL
• Tom Gutierrez (2000) Postdoc UCD
• Bill Caskey (1999) Z-World, Davis CA
• Lynn Wood (1998) Z-World, Davis CA
• Doug Mayo (1997) Staff Scientist LANL
• Jason Dunn (1997) Professor - Idaho Christian
• Isaac Huang (1997) FunMail.com
• Jack Osbourn (1995) Professor - Sac State
• Jessica Kintner (1995) Professor - St. Mary’s
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Daniel Cebra - Physics 295
What Do We Do?
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Daniel Cebra - Physics 295
Basics
Hadrons =
Made of
quarks
Baryon = 3 q
meson = q q
p = uud
n = udd
p+ = ud
K+ = us
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Daniel Cebra - Physics 295
Relativistic Heavy Ion Physics:
Creating Mini-`Big Bangs’ in the Laboratory
1) Goal: Use relativistic collisions of nuclear to
create hot dense matter which reproduces the
earliest stages of the universe
2) Now,
how do
we do
this?
(In Theory)
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Daniel Cebra - Physics 295
PS… Check out
our web page at
http://nuclear.
ucdavis.edu
3) How do we really do this?
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Daniel Cebra - Physics 295
Temperature
Nuclear Matter Phase Diagram
Baryon Density
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Daniel Cebra - Physics 295
How to Take the
Temperature
• Determine the momentum
of each ‘track’
• Identify the particle type of
each track
• Assume that the particles
are emitted from an
equilibrated gas
• Temperatures are measured
in the range expected for a
QGP transition
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Daniel Cebra - Physics 295
The Hottest matter in the Universe
Scientists have recently
set records for both the
highest and lowest
measured temperatures.
The high temperatures
approach those of the
early stage of the Big
Bang.
•Room Temperature 300 K
•Coldest place on Earth 184 K
(Vostock Station - Antarctica)
•Air turns to liquid 73 K
•Coldest place in the solar
system (Triton) 38K
•Helium turns to liquid 4.2 K
•Dilution Refrigeration .002 K
•Relativistic Heavy Ion
Collisions 1.3x1012 K
(2002)
•Thermonuclear Fusion
Device 3x106 K
•The surface of the Sun
5800 K
•The hottest place in the
Solar system (Io) 2000 K
•The highest recorded
temperature on earth
(Libya) 330 K
•Magnetic Cooling 90 mK
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•Ion Trapping
10 nK (1999)
Daniel Cebra - Physics 295
Relativistic Heavy Ion Collider
Brookhaven National Laboratory
Upton, New York