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Differential Plunger for Lifetimes of Unbound States in Exotic Nuclei

The project aims to measure lifetimes of unbound states in exotic nuclei using a unique Differential Plunger technique. Led by a team of experts, the project involves design, manufacture, and exploitation in the field of physics. Currently in the testing phase, components have been acquired and manufacturing completed with efficient feedback devices for precise measurements.

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Differential Plunger for Lifetimes of Unbound States in Exotic Nuclei

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  1. A new Differential Plunger to measure lifetimes of unbound states in tagged exotic nuclei Mike Taylor

  2. Who’s Involved ? • Project Lead, design, manufacture and • exploitation - Manufacture and exploitation • Host, technical expertise, manufacture • and exploitation • Design and technical expertise

  3. Physics Motivation Project Overview Current Status

  4. DPUNS Physics Investigation into the effect of deformation on proton emission rates [1] Phys. Rev. Lett. 97, 162502 (2006)

  5. DPUNS Physics 151Lu [σ ~ 70μb] Proton tagging 953 (19/2-) 863 (15/2-) 612 11/2- 82(10) ms • Also, p decay, 16(1) μs • from an unplaced • isomeric state p [1] [2] [1] PRC 59, R2984 (1999), [2] PRC 61, 021304(R) (2000)

  6. Project Overview

  7. Differential Plunger Technique x Beam V1 V2 Reaction Target Degrader g2 g1 Intensity Eg τfrom Differential Decay Curve Method (DDCM) [1] Z. Phys. A 334, 163 (1989)

  8. DPUNS @ JYFL Tagging with GREAT Beam

  9. Upstream End

  10. Piezo Motor and Actuator • Motor • Range: 30mm/7μm • Resolution: 20nm • Voltage: < 50 V • (c.f. ~1200V) • Actuator • Resolution: 0.05 nm

  11. Efficiency Improvement Target Degrader Gas window Plunger RITU

  12. Efficiency Improvement Target Degrader Gas window Plunger RITU

  13. Downstream End

  14. Feedback Devices Motor: • TESA TT-20 & Probe • Range: ±5 mm • Resolution: 0.1 μm

  15. Feedback Devices Actuator: Beam Target Degrader

  16. Current Status

  17. Manufacturing Phase Completed Purchased components acquired

  18. Testing Phase • Vacuum tested: 1.7x10-5 bar • Components: motor and μm probe • Device stability

  19. Still To Do...

  20. Thank You ! D. M. Cullen and A. J. Smith University of Manchester P. M. Jones and P. Nieminen University of Jyväskylä P. A. Butler University of Liverpool

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