A new Differential Plunger to measure lifetimes of unbound states in tagged exotic nuclei

Mike Taylor

Who’s Involved ?

- Manufacture and exploitation

- Host, technical expertise, manufacture and exploitation

- Design and technical expertise

- Project Lead, design, manufacture and exploitation

1. Physics Motivation

2. Project Overview

3. Current Status

DPUNS PhysicsInvestigation into the effect of deformation on proton emission rates

theomeas tt 2121

[1] Phys. Rev. Lett. 97, 162502 (2006)

theo),,( 42

DPUNS Physics

[1] PRC 59, R2984 (1999), [2] PRC 61, 021304(R) (2000)

p11/2-

(15/2-)

(19/2-)953

863

612

151Lu

82(10) ms• Also, p decay, 16(1) μs from an unplaced isomeric state

[σ ~ 70μb]Protontagging

[1] [2]

2. Project Overview

Differential Plunger Technique

Beam

ReactionTarget

x

Degrader

12

V1 V2

E

Inte

nsity

[1] Z. Phys. A 334, 163 (1989)τ from Differential Decay Curve Method (DDCM)

Beam

DPUNS @ JYFLTagging with GREAT

Upstream End

Motor• Range: 30mm/7μm

• Resolution: 20nm

• Voltage: < 50 V (c.f. ~1200V)

Piezo Motor and Actuator

Actuator• Resolution: 0.05 nm

Gas windowDegraderTarget

Efficiency Improvement

Plunger RITU

Gas windowDegraderTarget

Efficiency Improvement

Plunger RITU

Downstream End

Feedback Devices

TESA TT-20 & Probe• Range: ±5 mm

• Resolution: 0.1 μm

Motor:

Target

Degrader

Actuator:

Beam

Cd 1

Feedback Devices

3. Current Status

Manufacturing Phase Completed

Purchased components acquired

Testing Phase

• Vacuum tested: 1.7x10-5 bar

• Components: motor and μm probe

• Device stability

Still To Do...

April/May •Component testing

June/July •Fully assemble and vacuum test

Aug/Sept •Ship to Jyväskylä

Oct/Nov •Beam test on MARA line

2012 •Commissioning and first campaign

Thank You !D. M. Cullen and A. J. Smith

University of Manchester

P. M. Jones and P. NieminenUniversity of Jyväskylä

P. A. ButlerUniversity of Liverpool