ISOLDE Physics Report Magdalena Kowalska. Injector schedule since last meeting 2 September: confirmation of 2 more weeks with protons – until December.

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Presentation transcript:

ISOLDE Physics Report Magdalena Kowalska

Injector schedule since last meeting 2 September: confirmation of 2 more weeks with protons – until December 17 th : 35 -> 37 weeks of physics (vs 29 weeks in 2011) physics started April 2 protons stop Dec 17

Running period ISOLDE program 2012 Status mid-october (schedule v3.0): GPS HRS

ISOLDE schedule – Oct 26th 4 => new ISOLDE schedule v4.0, 26 th Oct: All GPS runs rescheduled (some shifts cut), partly in 2 additional weeks Failed summer run (11Be) also rescheduled CaO and offline 44Ti on GPS  No IS experiment cancelled (3 collection LOIs cancelled) Usual pdf version under preparation GPS HRS Mid-October: GPS problem - extraction electrode stuck in the middle of target valve -> only light targets allowed

Shifts 2012 Shift balance: 1009 open shifts for IS experiments, 53 shifts for LOIs Shift requests: 833 shifts for 71 IS exp vs in 2010; 40 shifts for 14 LOIs 20 IS experiments with no beam requests REX requests: shifts (IS + LOIs) 5 Scheduled runs (since July – 2wk prolongation & GPS problem): ScheduledOct 2012July All shifts (IS+LOI+MD) Shifts for IS exp Shifts for LOIs # of IS exp5153 # of LOIs1013 REX runs & exp ? - 14 REX shifts (IS +LOI) Average shifts/day

IS478: Coulomb excitation of 72Kr 6 Oblate 72 Kr expected The technique Coulex Spectra - number of counts in 710 keV depends on the shape of 72 Kr Doppler Corrected for 104 Pd target excitation Doppler Corrected for 72 Kr projectile excitation: 150 counts in 710 keV line

IS492: first online diffusion spectra First concentration profile measured with the new online diffusion chamber. The absolute depth is estimated to be in the order of about 2 µm. (CdTe:Cd means Cd-rich CdTe material) 7

IS497: Collinear laser spectroscopy on Cd Spins, charge radii and moments of Cd Discovery on new long-lived isomers in 125,127,129Cd 8 # counts Isotope shift relative to 114 Cd I. II.III. 129 Cd hfs - g.s. + isomer transition in Cd II: 5s 2 S 1/2 → 5p 2 P 214 nm

IS534: beta-delayed fission of At Mass Distributions Measurements of 194,196Po via  -delayed fission of 194,196At 9 196At 194At

Wind mill – decay spectrometer ( ) IS518& 534: Laser Spectroscopy of n-deficient Au HFS studies: all isotopes are accessible due to complementarity (decay vs. counting)  Region of deformed nuclei in neutron-rich gold isotopes State-selective spectroscopy on pure samples (isomer selectivity at RILIS + isobar selectivity at ISOLTRAP)  Determination of excitation energies wave number / cm -1 counts 179 Au preliminary! ISOLTRAP – detector for single ions ( )

IS532: N-rich Ca masses at ISOLTRAP Masses of 51,52 Ca measured with conventional TOF resonances in ISOLTRAP‘s precision trap. Agree with TITAN, uncertainty reduced by at least a factor of 10 Direct mass-measurement using the MR-TOF on Ca On mass 54, 2000 ions detected in the TOF window of calcium. 11 Measurement time / arb. units Time of flight / arb. units Expected TOF 54 Ca lasers off protons off 54 Cr

New techniques (LOIs) in the summer Very successful LOI runs based on new experimental techniques:  Jul: spin polarization with tilted foils behind REX - % beta-NMR signal on 8Li  Aug: beta-NMR on liquids for biophysics – 1 st liquid beta-NMR signal (31Mg in ionic liquid)  Aug & Oct – CRIS shows expected detection efficiency and reaches 202Fr 12

New setups in the summer Successful experiments with new setups & by new groups:  21Na and 31Mg with REX scattering chamber (Lund and Tokyo);  6He with opt. time-proj. chamber (Warsaw);  34Mg with fast tape-station (Bucharest)  12 Be with active target MAYA; 13

Long shutdown Presently: first protons to ISOLDE at the end of June 2014 Access to ISOLDE: with permanent dosimeter, helmets and safety shoes; under discussion whether safety equipment will stay after LS1 14 :