The Proton Spectrum in Neutron Beta Decay: Latest Results with the aSPECT Spectrometer

Konrad, Gertrud; Guardia, F. Ayala; Baeßler, S.; Borg, M.; Glück, F.; Heil, W.; Konorov, I.; Leung, K.; Horta, Raquel Muñoz; Simson, M.; Sobolev, Yuri; Söldner, T.; Wirth, H. F.; Zimmer, O.

doi:10.1016/j.nuclphysa.2009.05.114

Cited by 6 publications

(6 citation statements)

References 8 publications

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“…The trapped electrons can produce ions and electrons in the residual gas of the vacuum, and the presence of the electric field can accelerate them causing production of secondary charges up to electrical break down. For instance, even in the aSPECT neutron β-decay apparatus, with its excellent vacuum conditions, this effect has been problematic [29,30]. The vertical configuration avoids the electron trapping problem since the upper coil is not required for UCN confinement.…”

Section: Advantages Of the Vertical Configurationmentioning

confidence: 99%

A Comparison of Two Magnetic Ultra-Cold Neutron Trapping Concepts Using a Halbach-Octupole Array

Leung¹,

Иванов²,

Martin³

et al. 2014

Next Generation Experiments to Measure the Neutron Lifetime

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Preprint of an article published in Next Generation Experiments toMeasure the Neutron Lifetime, pp. 145-154, This paper describes a new magnetic trap for ultra-cold neutrons (UCNs) made from a 1.2 m long Halbach-octupole array of permanent magnets with an inner bore radius of 47 mm combined with an assembly of superconducting end coils and bias field solenoid. The use of the trap in a vertical, magneto-gravitational and a horizontal setup are compared in terms of the effective volume and ability to control key systematic effects that need to be addressed in high precision neutron lifetime measurements.

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Section: Advantages Of the Vertical Configurationmentioning

confidence: 99%

A Comparison of Two Magnetic Ultra-Cold Neutron Trapping Concepts Using a Halbach-Octupole Array

Leung¹,

Иванов²,

Martin³

et al. 2014

Next Generation Experiments to Measure the Neutron Lifetime

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“…Neutron decay offers a number of independent observables, considerably larger than the small number of parameters describing this decay in the Standard Model. Examples are the electron-antineutrino correlation coefficient a [3][4][5][6], the beta asymmetry parameter A [7][8][9][10][11], the neutrino asymmetry parameter B [12,13] (reconstructed from proton and electron momenta), the proton asymmetry parameter C [14], the triple correlation coefficient D [15,16], the Fierz interference term b, and various correlation coefficients involving the electron spin [17,18]. Each coefficient in turn relates to an underlying broken symmetry.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopy with cold and ultra-cold neutrons

Abele

Jenke

Konrad

2015

EPJ Web of Conferences

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Abstract. We present two new types of spectroscopy methods for cold and ultra-cold neutrons. The first method, which uses the R×B drift effect to disperse charged particles in a uniformly curved magnetic field, allows to study neutron β-decay. We aim for a precision on the 10 −4 level. The second method that we refer to as gravity resonance spectroscopy (GRS) allows to test Newton's gravity law at short distances. At the level of precision we are able to provide constraints on any possible gravity-like interaction. In particular, limits on dark energy chameleon fields are improved by several orders of magnitude.

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“…The aSPECT experiment had to move to the cold neutron beam line PF1b [4] of the Institut Laue-Langevin (ILL) in Grenoble, France [5,6]. In order not to disturb neighboring experiments, in particular the spin-echo spectrometer IN11 [7], by the stray magnetic field, we had to develop a magnetic field return yoke [8,9] for the aSPECT magnet system.…”

Section: Introductionmentioning

confidence: 99%

“…The additional magnetic forces on the magnet coils must not be destructive. 5. The magnetic shielding should not prevent access to the spectrometer.…”

Section: Introductionmentioning

confidence: 99%

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The magnetic shielding for the neutron decay spectrometer aSPECT

Konrad¹,

Guardia²,

Baeßler³

et al. 2014

Nuclear Instruments and Methods in Physics Research Section A:

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Many experiments in nuclear and neutron physics are confronted with the problem that they use a superconducting magnetic spectrometer which potentially affects other experiments by their stray magnetic field. The retardation spectrometer aSPECT consists, inter alia, of a superconducting magnet system that produces a strong longitudinal magnetic field of up to 6.2 T. In order not to disturb other experiments in the vicinity of aSPECT, we had to develop a magnetic field return yoke for the magnet system. While the return yoke must reduce the stray magnetic field, the internal magnetic field and its homogeneity should not be affected. As in many cases, the magnetic shielding for aSPECT must manage with limited space. In addition, we must ensure that the additional magnetic forces on the magnet coils are not destructive.In order to determine the most suitable geometry for the magnetic shielding for aSPECT, we simulated a variety of possible geometries and combinations of shielding materials of non-linear permeability. The results of our simulations were checked through magnetic field measurements both with Hall and nuclear magnetic resonance probes. The experimental data are in good agreement with the simulated values: The mean deviation from the simulated exterior magnetic field is (−1.7 ± 4.8) %. However, in the two critical regions, the internal magnetic field deviates by 0.2 % respectively < 1 × 10 −4 from the simulated values.

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The Proton Spectrum in Neutron Beta Decay: Latest Results with the aSPECT Spectrometer

Cited by 6 publications

References 8 publications

A Comparison of Two Magnetic Ultra-Cold Neutron Trapping Concepts Using a Halbach-Octupole Array

A Comparison of Two Magnetic Ultra-Cold Neutron Trapping Concepts Using a Halbach-Octupole Array

Spectroscopy with cold and ultra-cold neutrons

The magnetic shielding for the neutron decay spectrometer aSPECT

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