Daniel Cebra - Physics 29512-Mar-0312-Mar-03

Experimental Experimental Nuclear Physics at Nuclear Physics at

UC DavisUC Davis

PS… Check out our web page at http://nuclear.ucdavis.edu

• FACULTY:• 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

Come visit us on the fifth floor - WEST end

Daniel Cebra - Physics 29512-Mar-0312-Mar-03

Recent GraduatesRecent 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

Daniel Cebra - Physics 29512-Mar-0312-Mar-03

What Do We Do?What Do We Do?

Daniel Cebra - Physics 29512-Mar-0312-Mar-03

BasicsBasics

Hadrons =Made of quarks

Baryon = 3 qmeson = q q

p = uudn = udd+ = udK+ = us

Daniel Cebra - Physics 29512-Mar-0312-Mar-03

1) Goal: Use relativistic collisions of nuclear to create hot dense matter which reproduces the earliest stages of the universe

Relativistic Heavy Ion Physics:Relativistic Heavy Ion Physics:Creating Mini-`Big Bangs’ in the LaboratoryCreating Mini-`Big Bangs’ in the Laboratory

PS… Check out our web page at http://nuclear.ucdavis.edu

2)2) Now, Now, how do how do we do we do this?this?

(In Theory)(In Theory)

Daniel Cebra - Physics 29512-Mar-0312-Mar-03

3) How do we really do this?3) How do we really do this?

Daniel Cebra - Physics 29512-Mar-0312-Mar-03

Nuclear Matter Phase DiagramNuclear Matter Phase Diagram

Baryon Density

Tem

per

atu

re

Daniel Cebra - Physics 29512-Mar-0312-Mar-03

How to Take the How to Take the TemperatureTemperature

• 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

Daniel Cebra - Physics 29512-Mar-0312-Mar-03

The The HottestHottest matter in the Universe matter in the UniverseScientists 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

•Magnetic Cooling 90 K

•Ion Trapping 10 nK (1999)

•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

Relativistic Heavy Ion ColliderBrookhaven National Laboratory

Upton, New York