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High-precision studies on pure species using Penning traps

High-precision studies on pure species using Penning traps. Magdalena Kowalska CERN, PH-Dept., ISOLDE. On behalf of the ISOLTRAP collaboration. High-precision mass studies. Nuclear Structure: shell closure, pairing, deformation, halos. Astrophysics:

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High-precision studies on pure species using Penning traps

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  1. High-precision studies on pure species using Penning traps Magdalena Kowalska CERN, PH-Dept., ISOLDE On behalf of the ISOLTRAP collaboration

  2. High-precision mass studies Nuclear Structure: shell closure, pairing, deformation, halos Astrophysics: Nucleosynthesis, r- and rp-process Weak Interaction: symmetry tests, CKM unitarity (Vud) dm/m  1·10-7 dm/m < 1·10-7 dm/m < 3·10-8 ISOLTRAP, 2004-2009: 4 Letters 4 Letters 2 Letters At ISOLDE, masses of exotic nuclei are investigated with ISOLTRAP: the ‘mother’ of online Penning trap mass spectrometers, where also decay-spectroscopy can be performed on purified samples Unique: the beams available and the know-how at ISOLDE and ISOLTRAP Mass of the nucleus => binding energy of the system: Determines the energy released in decays and reactions:

  3. Masses and Penning traps • Penning trap mass spectrometry achievements: • ultra-high accuracy: better than 10-8 (e.g. 22Mg) • extreme resolving power: close to 10 million (Hg isotopes) • isobaric separation (e.g rare-earth nuclides) • isomer separation (e.g. Cu and Tl isotopes) • single-ion sensitivity: production rates of 1 ion/s (252No) • high efficiency: half-lives down to 10 ms (11Li) • But not all at the same time! Limits: half-life and production rate, beam purity Mass determined from the ion cyclotron frequency: Mass uncertainty decreases with the interaction time Solution: increase the beam intensity and the charge state => planned within the HIE (High Intensity and Energy) ISOLDE project

  4. Access to more exotic species Access to species with high contamination Higher precision Astrophysics: 82Zn, 132Sn and 140Te regions Weak interaction: Vud matrix element from mirror transitions, 21Na,23Mg Halo nuclei: 12,14Be, 11Li Z 50 a N 82 50 HIE-ISOLDE and mass studies • HIE-ISOLDE impact on ISOLTRAP: • Increased beam intensity • Better resolving power • Highly-charged ions Push the limits of online mass studies:

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