Final Activity Report Summary - LPCTRAP05 (Precision tests of the Standard Model using beta decay and a novel transparent Paul trap)
Several experiments on stable beams, namely 4He+, 12C2+, 35Cl+ and 36,40Ar+, delivered at different energies were carried out to improve the efficiency figure of the LPCTrap facility. Several modifications along the beam line were implemented among the runs (NIMA). Two experiments on 6He+ ions took place. The first experiment, during May 2005, provided the proof of principle for the correlation measurement. These were the first in-trap decays in ion traps. The second experiment was performed at the end of July 2006 and provided about 100 000 beta-neutrino coincidences from the decay of 6He+ ions.
A preliminary analysis was carried out to identify the effects of the RF field and size of the ion cloud on the time-of-flight spectrum of recoil ions which was obtained in the second 6He+ experiment. The analysis already showed an effect of the phase of the RF field in the time-of-flight spectrum. An effect of the size of the ion cloud was not observed, since it was hidden by the RF field.
More experiments would be needed to determine a final value of 'a'. Even though the statistics improved considerably from the first 6He+ run in May 2005 to the second 6He+ run in July 2006, a competitive value of 'a' needed further improvements.
Several proceedings were published in peer-review articles. The fellow was the first author in the NIMA paper 'The LPCTrap facility: a novel transparent Paul for high-precision experiments' as well as in the proceedings for the TCP'06 contribution. These proceedings were published in 'Hyperfine Interactions' as recommended by the referee. Other publications written by other members of the group were also submitted.
A preliminary analysis was carried out to identify the effects of the RF field and size of the ion cloud on the time-of-flight spectrum of recoil ions which was obtained in the second 6He+ experiment. The analysis already showed an effect of the phase of the RF field in the time-of-flight spectrum. An effect of the size of the ion cloud was not observed, since it was hidden by the RF field.
More experiments would be needed to determine a final value of 'a'. Even though the statistics improved considerably from the first 6He+ run in May 2005 to the second 6He+ run in July 2006, a competitive value of 'a' needed further improvements.
Several proceedings were published in peer-review articles. The fellow was the first author in the NIMA paper 'The LPCTrap facility: a novel transparent Paul for high-precision experiments' as well as in the proceedings for the TCP'06 contribution. These proceedings were published in 'Hyperfine Interactions' as recommended by the referee. Other publications written by other members of the group were also submitted.