High-precision mass measurements of exotic nuclides:

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Presentation transcript:

High-precision mass measurements of exotic nuclides: ISOLDE workshop 2007, February 12-14 High-precision mass measurements of exotic nuclides: The 2006 harvest of ISOLTRAP Alexander Herlert for the ISOLTRAP Collaboration CERN, PH-IS, Geneva

determination of cyclotron frequency ISOLTRAP: Experimental setup determination of cyclotron frequency (R = 107) B + q/m 2 m B = 5.9 T removal of contaminant ions (R = 105) B = 4.7 T Bunching of the continuous beam G. Bollen, et al., NIM A 368, 675 (1996) F. Herfurth, et al., NIM A 469, 264 (2001)

Nuclides investigated 2003-2006 proton number 2003-2006: 24 on-line runs 125 nuclides investigated neutron number

Isomer selection and spin assignment K. Blaum et al., Europhys. Lett. 67, 586 (2004) J. Van Roosbroeck et al., Phys. Rev. Lett. 92, 112501 (2004) proton number neutron number

Test of CKM unitarity proton number neutron number 22Mg+ F. Herfurth et al., EPJA 15, 17 (2002) A. Kellerbauer et al., PRL 93, 072502 (2004) M. Mukherjee et al., PRL 93, 150801 (2004) 22Mg+ proton number neutron number J.C. Hardy and I.S. Towner, Phys. Rev. C 71, 055501 (2005)

Nucleosynthesis and r-process 81Zn+ proton number neutron number

New ion detector new detector Channeltron detector Spare MCP Feed- Drift tube Channeltron detector Spare MCP Feed- through Number of pulse C. Yazidjian et al. (Hyperfine Interact., in print)

Comparison of efficiency new detector

New temperature-stabilization system sensor Heater Fan +/- 5mK M. Marie-Jeanne et al.

ISOLTRAP mass measurements in 2006 Nuclides measured in 2006 61-63Fe 124,126Cd 56-63Mn 112,114,116,118,120,121Ag 38,39Ca 26,27Al

Mass excess comparison for Ag and Cd data both runs stopped by power cuts new on-line measurements planned in 2007

First on-line run with application of Ramsey technique masses for CKM-unitarity test (superallowed b decay) Tz = 0 Tz = -1 26Al 38Ca

... and other investigations from Penning trap spectrometers CPT Tz = 0 LEBIT 62Ga 46V JYFLTRAP 38Ca Tz = -1 42Sc 26Al ISOLTRAP

Mass and half-life of 38Ca Experiment IS437: Precision measurement of the half-life and the β-decay Q value of the superallowed 0+→0+ β decay of 38Ca fluorination of 38Ca at target and removal of daughter 38mK with REXTRAP half-life measurement with tape-station system mounted behind REXTRAP mass measurement (in parallel) with ISOLTRAP simulation for 38Ca talk by Bertram Blank on Wednesday B. Blank et al.

Time-separated rf excitations (Ramsey scheme) TOF / μs Frequency detuning / Hz two excitation periods S. George et al. (to be published)

Preliminary result 38Ca preliminary S. George et al. (to be published) 38Ca19F preliminary 38Ca S. George et al. (to be published)

The case of 26,27Al ? (evaluation in progress ...)

Ion yields at ISOLDE SC and PSB yields protons neutrons courtesy: M. Turrion protons yield (ions/mC) neutrons

Decay in the buffer-gas-filled preparation trap Application of in-trap decay Decay in the buffer-gas-filled preparation trap produced at ISOLDE e+ ZX A Z-1Y Make more radioactive species available Nearly simultaneous wc measurement of mother and daughter nuclei 4He 4He ZX A Z-1Y A + e+ 4He not produced at ISOLDE 4He 4He z (mm) 20 cm 4He 4He 4He 4He 4He Herlert et al., New J. Phys. 7, 44 (2005)

First application of in-trap decay mass spectrometry 61Fe+

Mass excess of neutron-rich Mn and Fe isotopes further measurements required ... preliminary nuclides around N=40 preliminary PhD thesis C. Guénaut

Outlook - New ion source (graphite oven and gas inlet) installed end of 2006 new ion source

Outlook - Hydrogen cooling for light nuclides masses as input values for charge radii measurements ... F. Herfurth, 2001

Thanks a lot for your attention! Not to forget … Thanks to my co-workers: G. Audi, S. Baruah, D. Beck, K. Blaum, G. Bollen, M. Breitenfeldt, P. Delahaye, M. Dworschak, S. George, C. Guénaut, U. Hager, F. Herfurth, A. Kellerbauer, H.-J. Kluge, D. Lunney, M. Marie-Jeanne, M. Mukherjee, S. Schwarz, R. Savreux, L. Schweikhard, C. Weber, C. Yazidjian, ..., and the ISOLTRAP and ISOLDE collaboration Thanks for the funding and support: BMBF, GSI, CERN, ISOLDE, EU networks EUROTRAPS, EXOTRAPS, and NIPNET Thanks a lot for your attention!