Fixed Decay Station at ISOLDE

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Presentation transcript:

Fixed Decay Station at ISOLDE Introduction: Strong physics case for decay studies at ISOLDE using an efficient germanium array surrounding an implantation/decay station Approved experiments: IS456: Study of polonium isotopes ground state properties by simultaneous atomic- and ... IS474: Fast-timing studies of nuclei below 68Ni populated in the beta-decay of Mn isotopes IS476: Studies of beta-delayed two-proton emission: The cases of 31Ar and 35Ca IS507: Study of the beta-decay of 20Mg IS525: Study of multi-neutron emission in the beta-decay of 11Li IS534: Beta-delayed fission, laser spectroscopy and shape-coexistence studies with radioactive... IS545: Experimental investigation of decay properties of neutron deficient 116-118Ba isotopes ..... Beam development creates new opportunities for (pioneering) decay studies Current situation: removable detection systems (at LA1 or GLM) limited germanium detection efficiency  need for a fixed set-up with an efficient germanium array and ancillary detectors Original idea: use of Miniball detectors and/or Miniball position (Miniball workshop March 5-6, 2012 Koln) Moving Miniball clusters is cumbersome and risky Not compatible with Coulex and transfer reaction set-up

Fixed Decay Station at ISOLDE Proposal: Fixed decay station position at ISOLDE LA1, former Mistrall or other beam port Miniball type or clover type germanium detectors positioned around a decay station: source to detector distance ~ 5-10 cm: flexible holding structure tape system with plastic scintillator detectors for beta detection: b-decay studies windmill or equivalent system hosting carbon foils and silicon detectors: a-decay, b-delayed fission, b-delayed charge particle studies neutron detectors: b-delayed neutron studies fast timing detectors anti-Compton shields Needs: good and reproducible ISOLDE beam transmission proper beam diagnostics and definition DAQ: compatible with ISOLDE DAQ developments space for TOF neutron detectors and for flexible mounting of germanium detectors and shielding.

Fixed Decay Station at ISOLDE Collaboration/interest: Positive response: Spain (Madrid, Valencia), UK (Paisley, York, Liverpool), Germany (Koln, Darmstadt, Munchen), Denmark (Aarhus), Sweden (Lund), France (Bordeaux), Finland (Jyvaskyla), Switzerland (ISOLDE) and Belgium (Leuven) ISOLDE Decay Station Workshop: October 3, 2012 in CERN Physics case Hardware, detectors and electronics Resources: what exists in the collaboration - permanent physicist at ISOLDE Task list/timeline Collaboration