Release of K from catcher foils

Melconian, D.; Trinczek, M.; Gorelov, A.; Alford, W.P.; Behr, John; D’Auria, J.M.; Dombsky, M.; Giesen, U.; Jackson, K. P.; Swanson, T. B.; Wong, Wan Yan

doi:10.1016/j.nima.2004.08.135

Cited by 11 publications

(20 citation statements)

References 21 publications

(17 reference statements)

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“…[4], so our results for both Fr and Rb are consistent with literature. We used the TRIM code [7] to evaluate the mean implantation depth for Fr in Y at 3 keV, which gives a value of 5.1 nm.…”

Section: A Rubidiumsupporting

confidence: 92%

“…In any case, as also discussed in Ref. [4], the diffusion coefficients derived from our data analysis can be properly considered as upper limits.…”

Section: B Continuous Regimementioning

confidence: 72%

“…This ratio is ∼ 6 × 10 −6 at 1000 K. In spite of the fact that high temperature enhances diffusion, we fixed an upper limit of 1050 K in order to preserve the cell coating [3] and hence not to compromise the trapping efficiency. This is a limitation because melting point of Y is T m =1799 K, and because the total release fraction grows with the ratio T /T m [4]. In this context, our goal was to check whether the efficiency of the neutralizer was high enough at a chosen temperature.…”

Section: Au +mentioning

confidence: 99%

“…For instance, Melconian et al take the case of a distribution modelled by a Gaussian times a linear term, with a characteristic implantation depth d [4]. In this case, the function becomesF…”

Section: A Pulsed Regimementioning

confidence: 99%

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Measurement of diffusion coefficients of francium and rubidium in yttrium based on laser spectroscopy

et al. 2008

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We report the first measurement of the diffusion coefficients of francium and rubidium ions implanted in a yttrium foil. We developed a methodology, based on laser spectroscopy, which can be applied to radioactive and stable species, and allows us to directly take record of the diffusion time. Francium isotopes are produced via fusion-evaporation nuclear reaction of a 100 MeV 18 O beam on a Au target at the Tandem XTU accelerator facility in Legnaro, Italy. Francium is ionized at the gold-vacuum interface and Fr + ions are then transported with a 3 keV electrostatic beamline to a cell for neutralization and capture in a magneto-optical trap (MOT). A Rb + beam is also available, which follows the same path as Fr + ions. The accelerated ions are focused and implanted in a 25 µm thick yttrium foil for neutralization: after diffusion to the surface, they are released as neutrals, since the Y work function is lower than the alkali ionization energies. The time evolution of the MOT and the vapor fluorescence signals are used to determine diffusion times of Fr and Rb in Y as a function of temperature.

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Section: A Rubidiumsupporting

confidence: 92%

“…In any case, as also discussed in Ref. [4], the diffusion coefficients derived from our data analysis can be properly considered as upper limits.…”

Section: B Continuous Regimementioning

confidence: 72%

Section: Au +mentioning

confidence: 99%

Section: A Pulsed Regimementioning

confidence: 99%

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Measurement of diffusion coefficients of francium and rubidium in yttrium based on laser spectroscopy

et al. 2008

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“…Ions of the short-lived isotope 37 K are delivered from ISAC, the radioactive beam facility at TRIUMF, and neutralized on a hot zirconium foil [18]. The atoms are then collected in a vapor-cell MOT in a preparation chamber with 0.1% efficiency [19].…”

Section: General Descriptionmentioning

confidence: 99%

Precision measurement of the nuclear polarization in laser-cooled, optically pumped³⁷K

et al. 2016

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We report a measurement of the nuclear polarization of laser-cooled, optically pumped 37 K atoms which will allow us to precisely measure angular correlation parameters in the b + -decay of the same atoms. These results will be used to test the V−A framework of the weak interaction at high precision. At the TRIUMF neutral atom trap (TRINAT), a magneto-optical trap confines and cools neutral 37 K atoms and optical pumping spin-polarizes them. We monitor the nuclear polarization of the same atoms that are decaying in situ by photoionizing a small fraction of the partially polarized atoms and then use the standard optical Bloch equations to model their population distribution. We obtain an average nuclear polarization of¯=  P 0.9913 0.0009, which is significantly more precise than previous measurements with this technique. Since our current measurement of the β-asymmetry has 0.2% statistical uncertainty, the polarization measurement reported here will not limit its overall uncertainty. This result also demonstrates the capability to measure the polarization to <0.1%, allowing for a measurement of angular correlation parameters to this level of precision, which would be competitive in searches for new physics.

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Measurement of the neutrino asymmetry in the β decay of laser-cooled, polarized 37K

et al. 2007

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Release of K from catcher foils

Cited by 11 publications

References 21 publications

Measurement of diffusion coefficients of francium and rubidium in yttrium based on laser spectroscopy

Measurement of diffusion coefficients of francium and rubidium in yttrium based on laser spectroscopy

Precision measurement of the nuclear polarization in laser-cooled, optically pumped³⁷K

Measurement of the neutrino asymmetry in the β decay of laser-cooled, polarized 37K

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Release of K from catcher foils

Cited by 11 publications

References 21 publications

Measurement of diffusion coefficients of francium and rubidium in yttrium based on laser spectroscopy

Measurement of diffusion coefficients of francium and rubidium in yttrium based on laser spectroscopy

Precision measurement of the nuclear polarization in laser-cooled, optically pumped37K

Measurement of the neutrino asymmetry in the β decay of laser-cooled, polarized 37K

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Precision measurement of the nuclear polarization in laser-cooled, optically pumped³⁷K