RDT Plunger Lifetime Measurements Workshop, GSI 2007 Workshop, GSI 2007 R. Julin -JYFL On behalf of the JYFL-Köln-Liverpool-Saclay-Munich collaboration.

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Presentation transcript:

RDT Plunger Lifetime Measurements Workshop, GSI 2007 Workshop, GSI 2007 R. Julin -JYFL On behalf of the JYFL-Köln-Liverpool-Saclay-Munich collaboration

Oblate 2p-2h Spherical 0p-0h Prolate 4p-4h Even-A Pb level levelsystematics Pb

Oblate 4p-2h Spherical 0p-0h Prolate 6p-4h Even-A Po level systematics Z = 84 Po

Hg level systematics Z = 80 Hg

PROLATE OBLATE Kinematic moments of inertia - J (1) Rigid: J (1) ~ β Hydrodynamical: J (1) ~ β 2 → Need B(E2), Q t

RDT Instrumentation at JYFL JUROGAM 43 Ge+BGO detectors Eff. 4% RITU Gas-filled recoil separator Transmission % GREAT Focal plane spectrometer TDR Total Data Readout Triggerless data acquisition system with 10 ns time stamping

Plunger lifetime RDT measurements JYFL-Köln collaboration

Limitations: Need heavy projectile to get high recoil velocity - we used Kr Need a degrader thick enough to get the shift → increase of the Ge – counting rate → drop in RITU transmission due to the small-angle scattering: 108 Pd( 83 Kr,3n) 188 Pb + 2.5mg/cm 2 Au → transmission reduced by 3 The best : 1 mg/cm2 Mg → dE similar to Au, Ge- rate OK, reduction factor of 2 Only the 15 backward angle (158º and 134º) Ge- detectors useful Typically at least 10 distances need to be measured Cross-section limits : 100µb in RDT 1mb in RG But - RDT results in very clean spectra !

106 Pd( 83 Kr,3n) 186 Pb RDT Recoil – Alpha - Tagged 108 Pd( 83 Kr,3n) 188 Pb RG Recoil Tagged Plunger measurements

W.u. 200(140) 460(160) 510(120) 6(2) 350(60) 440(70) 160(10) W.u. B(E2) │Q t │ J (1) Results for 186 Pb and 188 Pb │Q t │ → │β 2 │ = 0.29(5) for the ”pure” prolate states T.Grahn et al. PRL 97, (2006)

│Q t │ J (1)... for... for 194 Po and 196 Po │Q t │ → │β 2 │ = 0.17(3) for the oblate states - the ground state of 194 Po is a pure oblate 4p-2h state ? oblate 4p-2h state ?

│Q t │ J (1)... and for 180 Hg 180 Hg

PERSPECTIVES Improved sensitivity in plunger measurements: Digital signal processing → Higher counting rates in plunger measurementsDigital signal processing → Higher counting rates in plunger measurements AGATA demonstrator at backward angles !AGATA demonstrator at backward angles ! Recoil-shadow electron measurements Coulex - measurements at REXISOLDE needed