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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

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The Recoil Distance Doppler-Shift Method

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  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

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