Presentation is loading. Please wait.

Presentation is loading. Please wait.

Daniel Cebra - Physics 295 Seminar 07-Mar-01 The UCD Nuclear Physics Group Daniel Cebra Goal of this talk - to introduce the nuclear physics group and.

Published by Modified over 9 years ago

Similar presentations

Presentation on theme: "Daniel Cebra - Physics 295 Seminar 07-Mar-01 The UCD Nuclear Physics Group Daniel Cebra Goal of this talk - to introduce the nuclear physics group and."— Presentation transcript:

1 Daniel Cebra - Physics 295 Seminar 07-Mar-01 The UCD Nuclear Physics Group Daniel Cebra Goal of this talk - to introduce the nuclear physics group and explain what we do and why it is interesting PS… Check out our web page at http://nuclear.ucdavis.edu

2 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Meet the Group FACULTY: Jim Draper (emeritus) Paul Brady Daniel Cebra Ramona Vogt Daniel Ferenc STAFF: Juan Romero Tom Gutierrez GRAD STUDENTS: Mike Anderson (2001) Jenn Klay (2001) Ian Johnson (2002) Agusta Loftsdottir Clay Bratton UNDERGRADS: Stephenie Ritchey Mark Allen Allen Thoe Stephen Baumgarten Come visit us on the fifth floor - WEST end

3 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Recent Graduates Mike Heffner (2000) Postdoc LLNL Tom Gutierrez (2000) Postdoc UCD Bill Caskey (1999) Z-World, Davis CA Lynn Wood (1998) Z-World, Davis CA Jerry Chance (1997) Postdoc LBNL 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

4 Daniel Cebra - Physics 295 Seminar 07-Mar-01 What Do We Do?

5 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Cosmic Gamma Ray Astronomy Ferenc, Bratton, Loftsdottir

6 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Abstract of Research Goals The study of collisions between relativistic nuclei will ultimately allow the determination of the properties of nuclear matter over a wide range of temperatures and densities. Without the possibility of direct studies of nuclear matter in bulk (as in neutron stars, supernovae, or the Big Bang), one resorts to the challenging studies of finite and transient systems as provided by nucleus- nucleus collisions. Our experiments search for signatures of the Quark Gluon Plasma (QGP), a phase of matter which dominated the early stages of the Big Bang.

7 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Basics Hadrons = Made of quarks Baryon = 3 q meson = q q p = uud n = udd  + = ud K+ = us

8 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Goals of Relativistic Heavy Ions To study the properties of nuclear matter. Specifically to study the Quark- gluon plasma Allows a better understanding of the earliest phase of the universe.

9 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Nuclear Matter Phase Diagram Baryon Density Temperature

10 Daniel Cebra - Physics 295 Seminar 07-Mar-01 How to make a Quark-Gluon Plasma Quantum Chromodynamics (QCD) predicts that heavy nuclei collided at ultra relatavistic energies will undergo a phase transition from ordinary hadronic matter to a quark-gluon plasma (QGP).

11 Daniel Cebra - Physics 295 Seminar 07-Mar-01

12 Daniel Cebra - Physics 295 Seminar 07-Mar-01 History of the Rel. Heavy-ion Program 76-92 Bevalac, Au @ 0.1 - 1.0 AGeV 86-98 AGS, Au @ 2-10 AGeV 86-00? SPS, Pb @ 40-160 AGeV 91 RHIC approved 00 Colliding beams at RHIC, 130Gev

13 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Status of the AGS/SPS Results AGS exps track the Hot Hadron gas region Feb ‘00 - Press release on the observation of QGM at SPS

14 Daniel Cebra - Physics 295 Seminar 07-Mar-01 The Start of RHIC - Summer 00

15 Daniel Cebra - Physics 295 Seminar1 07-Mar-01 Brief History of the RHIC Project 1947 BNL founded 1952 Cosmotron 1960 AGS 1970 Tandem 1979 ISABELLE 1983 CBA canceled 1983 RHIC proposed 1991 RHIC approved 1992 STAR approved 1999 First Beams 2000 First collisions

16 Daniel Cebra - Physics 295 Seminar 07-Mar-01

17 Daniel Cebra - Physics 295 Seminar 07-Mar-01 The STAR Experiment - Plans

18 Daniel Cebra - Physics 295 Seminar 07-Mar-01 STAR - Under Construction

19 Daniel Cebra - Physics 295 Seminar 07-Mar-01

20 Daniel Cebra - Physics 295 Seminar 07-Mar-01 The Detector Now...

21 Daniel Cebra - Physics 295 Seminar 07-Mar-01

22 Daniel Cebra - Physics 295 Seminar 07-Mar-01

23 Daniel Cebra - Physics 295 Seminar 07-Mar-01 The FIRST Event!

24 Daniel Cebra - Physics 295 Seminar 07-Mar-01 STAR - peripheral event - Front Tracks emerge from common vertex point Grazing collisions produce few tracks Magnetic field bends trajectories into helices - allows measure of momentum Particle ID through gas dE/dx

25 Daniel Cebra - Physics 295 Seminar 07-Mar-01 STAR - peripheral event - side Determines the z location of the vertex emission angles of the tracks. Demonstrate true 3D tracking

26 Daniel Cebra - Physics 295 Seminar 07-Mar-01 STAR Event - Front View Central events have much higher multiplicity of tracks. Up to 2000 charged particles in the TPC’s accpectance

27 Daniel Cebra - Physics 295 Seminar 07-Mar-01 STAR Event -- Side View

28 Daniel Cebra - Physics 295 Seminar 07-Mar-01 STAR Calibration and Analysis Spatial resolution 700  Tracking - better then 90% efficiency dE/dx resolution = 8% momentum resolution better than 1%  K p e

29 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Spectra Temperatures are measured in the range expected for a QGP transition Suggestive result, but further analysis is needed

30 Daniel Cebra - Physics 295 Seminar 07-Mar-01 How we “see” Strangeness See Strange Hadrons –kaon (u or d and s) –lambda (uds) –Omega (sss) –etc... Distinguishing Decay Topologies –V0 –kink V0 vertex kink

31 Daniel Cebra - Physics 295 Seminar 07-Mar-01

32 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Centrality: Participants vs. Spectators “Spectators” Zero-degree Calorimeter “Spectators” Many things scale with N part : Transverse Energy Particle Multiplicity Particle Spectra “Participants” Only ZDCs measure N part The collision geometry (i.e. the impact parameter) determines the number of nucleons that participate in the collision Produced Particles

33 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Z ero D egree C alo as centrality device Only shared detector – –Rates: luminosity via well-known reference process – –Timing: substantial background rejection – –Pulse height: measures centrality Directly confirms monotonic relationship between participants with multiplicity

34 Daniel Cebra - Physics 295 Seminar 07-Mar-01 d  /dN vs N Comparison to cascade models demonstrates to collective behavior of nuclear systems Used to determine centrality of collisions

35 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Shapes of dN ch /d  for different N part   dN ch /d  (dN ch /d  )/(½N part ) dN ch /d  Data HIJING (dN ch /d  )/(½N part ) 354 216 102 Mean N part %% 0-3 15-20 35-40 Data

36 Daniel Cebra - Physics 295 Seminar 07-Mar-01 dN/d  Higher multiplicity than comparable p+p collisions indicates collective nature. Impressive agreement between the exps STAR PHENIX BRAHMS

37 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Source Radii The expected expansion of the outward radius is not seen. Transition may be at lower energy or more subtle. PHENIX

38 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Hydrodynamic Flow - Defined Radial flow – –Not seen in angular distributions – –Use HBT, spectra (T = T o + m Directed flow – –Forward rapidities – –Not measured yet PHOBOS/STAR – –Interesting predictions for phase transition… Elliptic flow – –Early time push, hydrodynamic evolution – –Strongest at y=0

39 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Hydrodynamic Flow - Results The RQMD cascade can not account for the observed flow. Collective behavior is demonstrated.

40 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Hydrodynamic Flow - Results Hydrodynamic model V2V2 Centrality midrapidity : |h| < 1.0 SPS AGS Preliminary RQMD

41 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Conclusions Summer ‘00 Heavy-ion running was successful - physics results already. But the QGP question is not yet resolved. RHIC should run heavy-ions for 6 months in ‘01 (also 1 month of proton running). Detectors Continue to improve (5-10 years). Future: eRHIC Future: LHC

42 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Compact Muon Solenoid

43 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Advertisements...

44 Daniel Cebra - Physics 295 Seminar 07-Mar-01 APS - join Now All active physicists should join APS Students memberships a very reasonable Go to meetings, give talks! California Section - next meeting will likely be in Davis

45 Daniel Cebra - Physics 295 Seminar 07-Mar-01 Intramural Sports! Basketball Basketball Soccer Soccer SoftballSoftball Other sports? Other sports?

Download ppt "Daniel Cebra - Physics 295 Seminar 07-Mar-01 The UCD Nuclear Physics Group Daniel Cebra Goal of this talk - to introduce the nuclear physics group and."

Similar presentations

Charm and beauty with ALICE at LHC

Charm and beauty with ALICE at LHC
Mass, Quark-number, Energy Dependence of v 2 and v 4 in Relativistic Nucleus- Nucleus Collisions Yan Lu University of Science and Technology of China Many.

Mass, Quark-number, Energy Dependence of v 2 and v 4 in Relativistic Nucleus- Nucleus Collisions Yan Lu University of Science and Technology of China Many.
Supported by DOE 11/22/2011 QGP viscosity at RHIC and LHC energies 1 Huichao Song 宋慧超 Seminar at the Interdisciplinary Center for Theoretical Study, USTC.

Supported by DOE 11/22/2011 QGP viscosity at RHIC and LHC energies 1 Huichao Song 宋慧超 Seminar at the Interdisciplinary Center for Theoretical Study, USTC.
Physics Results of the NA49 exp. on Nucleus – Nucleus Collisions at SPS Energies P. Christakoglou, A. Petridis, M. Vassiliou Athens University HEP2006,

Physics Results of the NA49 exp. on Nucleus – Nucleus Collisions at SPS Energies P. Christakoglou, A. Petridis, M. Vassiliou Athens University HEP2006,
Ultra Peripheral Collisions at RHIC Coherent Coupling Coherent Coupling to both nuclei: photon~Z 2, Pomeron~A 4/3 Small transverse momentum p t ~ 2h 

Ultra Peripheral Collisions at RHIC Coherent Coupling Coherent Coupling to both nuclei: photon~Z 2, Pomeron~A 4/3 Small transverse momentum p t ~ 2h 
Results from PHENIX on deuteron and anti- deuteron production in Au+Au collisions at RHIC Joakim Nystrand University of Bergen for the PHENIX Collaboration.

Results from PHENIX on deuteron and anti- deuteron production in Au+Au collisions at RHIC Joakim Nystrand University of Bergen for the PHENIX Collaboration.
Centauro and STrange Object Research (CASTOR) - A specialized detector system dedicated to the search for Centauros and Strangelets in the baryon dense,

Centauro and STrange Object Research (CASTOR) - A specialized detector system dedicated to the search for Centauros and Strangelets in the baryon dense,
In relativistic heavy ion collisions a high energy density matter Quark-Gluon Plasma (QGP) may be formed. Various signals have been proposed which probe.

In relativistic heavy ion collisions a high energy density matter Quark-Gluon Plasma (QGP) may be formed. Various signals have been proposed which probe.
Forward-Backward Correlations in Relativistic Heavy Ion Collisions Aaron Swindell, Morehouse College REU 2006: Cyclotron Institute, Texas A&M University.

Forward-Backward Correlations in Relativistic Heavy Ion Collisions Aaron Swindell, Morehouse College REU 2006: Cyclotron Institute, Texas A&M University.
A probe for hot & dense nuclear matter. Lake Louise Winter Institute 21 February, 2000 Manuel Calderón de la Barca Sánchez.

A probe for hot & dense nuclear matter. Lake Louise Winter Institute 21 February, 2000 Manuel Calderón de la Barca Sánchez.
Relativistic Heavy-Ion Collisions: Recent Results from RHIC David Hardtke LBNL.

Relativistic Heavy-Ion Collisions: Recent Results from RHIC David Hardtke LBNL.
Mid-rapidity charged hadron spectra in the Au+Au collisions at sqrt(s NN ) = 19.6 GeV at STAR University of California, Davis for the STAR Collaboration.

Mid-rapidity charged hadron spectra in the Au+Au collisions at sqrt(s NN ) = 19.6 GeV at STAR University of California, Davis for the STAR Collaboration.
Henrik Tydesjö May 5 2004 O UTLINE - The Quark Gluon Plasma - The Relativistic Heavy Ion Collider (RHIC) The PHENIX Experiment - QGP Signals Event-by-Event.

Henrik Tydesjö May O UTLINE - The Quark Gluon Plasma - The Relativistic Heavy Ion Collider (RHIC) The PHENIX Experiment - QGP Signals Event-by-Event.
Forward-Backward Correlations in Heavy Ion Collisions Aaron Swindell, Morehouse College REU Cyclotron 2006, Texas A&M University Advisor: Dr. Che-Ming.

Forward-Backward Correlations in Heavy Ion Collisions Aaron Swindell, Morehouse College REU Cyclotron 2006, Texas A&M University Advisor: Dr. Che-Ming.
Henrik Tydesjö March 17 2003 O UTLINE - The Quark Gluon Plasma - The Relativistic Heavy Ion Collider (RHIC) - The PHENIX Experiment - Event-by-Event Net-Charge.

Henrik Tydesjö March O UTLINE - The Quark Gluon Plasma - The Relativistic Heavy Ion Collider (RHIC) - The PHENIX Experiment - Event-by-Event Net-Charge.
Daniel Cebra - Physics 295 12-Mar-03 Experimental Nuclear Physics at UC Davis PS… Check out our web page at FACULTY: Jim Draper.

Daniel Cebra - Physics Mar-03 Experimental Nuclear Physics at UC Davis PS… Check out our web page at FACULTY: Jim Draper.
The fundamental nature of matter and forces Physics 114 Spring 2004 – S. Manly.

The fundamental nature of matter and forces Physics 114 Spring 2004 – S. Manly.
Daniel Cebra - Physics 295 11-Feb-04 Experimental Nuclear Physics at UC Davis PS… Check out our web page at FACULTY: Jim Draper.

Daniel Cebra - Physics Feb-04 Experimental Nuclear Physics at UC Davis PS… Check out our web page at FACULTY: Jim Draper.
- How can Net-Charge Fluctuations be used as a signal of a Quark- Gluon Plasma (QGP) phase transition? - Definition of a simple fluctuation measure, some.

- How can Net-Charge Fluctuations be used as a signal of a Quark- Gluon Plasma (QGP) phase transition? - Definition of a simple fluctuation measure, some.
Mini Bang at Big Accelerators Prashant Shukla Institute of Physics University of Heidelberg Presentation at ISA, 30 January 2005, Heidelberg, Germany.

Mini Bang at Big Accelerators Prashant Shukla Institute of Physics University of Heidelberg Presentation at ISA, 30 January 2005, Heidelberg, Germany.

Similar presentations

Ads by Google