1 / 3

The Recoil Distance Doppler-Shift Method

Target. Stopper.   1 - 1000ps. v ~ 1-2 % c. v. q. Detector. d. u: unshifted. s: shifted. E u. E s = E u (1+ v/c cos ). Measurement of level lifetimes in the picosecond range measure matrix elements between nuclear wave functions

anahid
Download Presentation

The Recoil Distance Doppler-Shift Method

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Target Stopper   1 - 1000ps v ~ 1-2 % c v q Detector d u: unshifted s: shifted Eu Es = Eu (1+ v/c cos) • Measurement of level lifetimes in the picosecond range • measure matrix elements between nuclear wave functions • direct measure of quadrupole moments (deformation) • very important observable in nuclear structure The Recoil Distance Doppler-Shift Method beam Decay Curve in fusion reactions v ~ 1-2 % c flight time: tf = d / v v= 0.01c, tf = 5 ps  d = 15 m d [mm]

  2. New Yale Plunger Device (N.Y.P.D.) Design by A. Dewald, Cologne • Stable distances (500Å) through stable mechanics • and feedback system with piezoelectric positioning • Capacitance used for distance measurements • LabView program for control by Grad. Student (Jeff Cooper) • Physics Program at YRAST Ball and Gammasphere • Multi-phonon states in deformed nuclei • Structure of neutron-rich nuclei  towards the limits • Magnetic Rotation - a new phenomenon

  3. N.Y.P.D. The Recoil Distance Doppler-Shift Method Target Stopper   1 - 1000ps beam v q v ~ 1-2 % c v= 0.01c, tf = 5 ps  d = 15 m d Detector u: unshifted s: shifted Eu Es = Eu (1+ v/c cos) Stable distances (500Å) through stable mechanics and feedback system with piezoelectric positioning Capacitance used for distance measurements

More Related