A NEW PLUNGER DEVICE FOR INVESTIGATING THE EFFECTS OF DEFORMATION ON PROTON EMISSION RATES VIA LIFETIME MEASUREMENTS

M J Taylor ,S Juutinen,D M Cullen,R Julin,C Scholey,T Grahn,D T Joss,G A Alharshan,P Rahkila,Α Dewald ,P Peura ,C Fransen ,J Sarén ,M Leino ,M Sandzelius ,S Ketelhut ,C Mcpeake ,Peter Butler ,U Jakobsson ,M G Procter ,J Sorri ,B Sayğı ,M Scheck ,V W Twist ,S Stolze ,Enrico Ellinger ,P M Jones ,P Nieminen ,A Mcfarlane ,P T Greenlees ,T Braunroth ,P Ruotsalainen ,A J Smith ,J Pakarinen ,J Uusitalo

doi:10.1142/9789814508865_0045

Abstract

A new plunger device has been designed and built to measure the lifetimes of unbound states in exotic nuclei beyond the proton drip-line. The device is designed to work in both vacuum and dilute-gas environments made possible through the introduction of a lowvoltage piezoelectric motors. The differential plunger for unbound nuclear states, DPUNS, will be used in conjunction with the gas-filled separator RITU and the vacuum separator MARA at the accelerator laboratory of the University of Jyvaskyla, Finland, to measure the lifetimes of excited states with low population cross-sections. This is achieved by eliminating the need for a carbon foil to isolate the helium gas of RITU from the beam line thus reducing the background from beam-foil reactions. The plunger will be used to address many key facets of nuclear structure physics with particular emphasis on the effect of deformation on proton emission rates.

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