Introduction to the Triangle Universities Nuclear Laboratory

John Kelley NCSU and TUNL

Overview of TUNL Physics Program

Emphasis on neutron induced partial cross section measurements

Laboratory

• Tandem Accelerator Laboratory • High Intensity -ray Source (HIGS)• Lab for Experimental Nuclear Astrophysics• Low background Radiation Counting Area

• Offsite projects: Los Alamos, Oak Ridge, KamLAND, JLab, Argonne Nat’l Lab, etc…

Physicists at TUNL (highlights)

• Nuclear Astrophysics

• Weak Interactions studies

• Fundamental Quantity Measurements

• Nucleon Structure

• Few-nucleon Interactions

• Nuclear Spectroscopy

• Nuclear Reactions Studies

LENA• Formation of the elements attracts our curiosities• Measurements of relevant Astrophysical Reaction rates are very difficult

– Rates change drastically with energy (star temperature) – Low energies are most important– Hindered by Coulomb force

Energy (keV)

50 150 250 350 4501

100

10000

1E+06

1E+08

1E+10

1E+12

1E+14

Cro

ss s

ect

ion [

Arb

. U

nit

s)Cross section

 

LENA

Ge DetectorTarget Assembly

NaI Annulus

Ge - NaI Detector Setup

Lead Shield

Shield Low Energy Environmental Background

Veto High Energy Cosmic Rays

Coincidence Gate On -rays Of Interest

Weak Interaction Studies

Fundamental Physics Quantities

• EDM

HIGS Laboratory

Nucleon Structure

Nucleon Structure

Nuclear Spectroscopy

Nuclear Astrophysics

Tandem Vander graph Lab

Few-body dynamics• n-d breakup

• For the simple 3-body system, we are unable to calculate simple observables.

Few-body dynamics

Nuclear Spectroscopy

• Nuclear Resonance Flouresence– Resonant -ray scattering

Before too longthings are out of control