PENeLOPE—on the way towards a new neutron lifetime experiment with magnetic storage of ultra-cold neutrons and proton extraction

Materne, S.; Picker, R.; Altarev, I.; Angerer, H.; Franke, B.; Gutsmiedl, E.; Hartmann, F. J.; Müller, A.; Paul, S.; Stoepler, R.

doi:10.1016/j.nima.2009.07.055

Cited by 36 publications

(32 citation statements)

References 13 publications

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“…Our calculations for a cylindrical multipole with large radius R = 1 m, a value similar to the multipole design of Ref. [28], gives ≈ 10 2 times lower spin-flip losses for the same values of B ζ .…”

Section: Results For the Field Model Of Equation (1)supporting

confidence: 68%

“…(1), which does not take into account the deviations induced in the actual designs by the discrete geometry of electric currents [23,28], or by the permanent magnet blocks with constant magnetization within each block in the schemes of Refs. [20,[24][25][26][27].…”

Section: Results For the Field Model Of Equation (1)mentioning

confidence: 99%

“…As expected from Eq. (26), |β| 2 jumps, within a few Larmor periods ( 10 µs), from 0 to the asymptotic curve given by (10) (or (28)). The remainder of the wave evolution up to the next TP, shown by the arrow, is practically unaffected by the transient at t ≈ 0.…”

Section: A Higher-order Solutionmentioning

confidence: 99%

“…[23][24][25][26][27][28], where the trapping fields are generated by Halbach arrays of permanent magnets [24][25][26][27] or, for [23,28] and, earlier [29], by superconducting currents. For these cylindrical configurations we use a 2D field model which enables us to obtain a semi-analytic expression for the ensemble-averaged spin-flip loss and which can be analyzed with no need to involve simulations.…”

Section: Outlinementioning

confidence: 99%

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Spin flip loss in magnetic confinement of ultracold neutrons for neutron lifetime experiments

et al. 2017

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We analyze the spin flip loss for ultracold neutrons in magnetic bottles of the type used in experiments aiming at a precise measurement of the neutron lifetime, extending the one-dimensional field model used previously by Steyerl et al. [Phys. Rev. C 86, 065501 (2012)] to two dimensions for cylindrical multipole fields. We also develop a general analysis applicable to three dimensions. Here we apply it to multipole fields and to the bowl-type field configuration used for the Los Alamos UCNτ experiment. In all cases considered the spin flip loss calculated exceeds the Majorana estimate by many orders of magnitude but can be suppressed sufficiently by applying a holding field of appropriate magnitude to allow high-precision neutron lifetime measurements, provided other possible sources of systematic error are under control.

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Section: Results For the Field Model Of Equation (1)supporting

confidence: 68%

Section: Results For the Field Model Of Equation (1)mentioning

confidence: 99%

Section: A Higher-order Solutionmentioning

confidence: 99%

Section: Outlinementioning

confidence: 99%

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Spin flip loss in magnetic confinement of ultracold neutrons for neutron lifetime experiments

et al. 2017

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“…In order to finally resolve the discrepancy, not only existing 'bottle' and 'beam' projects are continued, but also alternative methods of measuring the neutron lifetime are being developed worldwide: A new 'beam' experiment at J-PARC will detect the decay electrons rather than the decay protons [35], and new 'bottle' experiments at ILL [78,79], PNPI [23], LANSCE [80,81,82], FRM II [83,84], and TRIGA Mainz will confine UCNs with magnetic fields rather than material walls. These experiments aim at accuracies of 1 down to 0.1 s.…”

Section: The Neutron Lifetime Puzzlementioning

confidence: 99%

Cold and Ultra-cold Neutrons as Probes of New Physics

Konrad¹,

Abele²

2017

Proceedings of the 26th International Nuclear Physics Conference — PoS(INPC2016)

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Despite the great success of the Standard Model, many key questions in particle physics, astrophysics, and cosmology are unanswered. In particular, more than 95 % of the universe consists of unknown dark matter and dark energy. Today, a major goal of particle physics is to look for evidence of new physics beyond the Standard Model. Collider searches for new physics are well suited to the direct production of new high-mass particles, whereas low-energy precision experiments search for traces that new particles leave in known processes. Direct and indirect evidence of new physics are highly complementary. High-precision experiments with extremely slow, cold and ultra-cold neutrons address some of the unanswered questions, for instance, on the nature of the fundamental forces and underlying symmetries, the origin, evolution, and fate of the universe, or on the nature of the gravitational force at very small distances. For example, the limit on the electric dipole moment of the neutron constrains the CP violating phases, the lifetime of the neutron determines the relative helium abundance in the universe, and neutrons bouncing over a mirror probe dark matter and dark energy. New facilities and technological developments now give window for significant improvement in precision by one to two orders of magnitude. In this paper, we will give an overview of current and planned facilities and experiments, as well as an overview of some of the applications of neutrons to astrophysics, cosmology, and physics beyond the Standard Model.

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Radiation Physics and Radionuclide Decay

L’Annunziata¹

2012

Handbook of Radioactivity Analysis

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PENeLOPE—on the way towards a new neutron lifetime experiment with magnetic storage of ultra-cold neutrons and proton extraction

Cited by 36 publications

References 13 publications

Spin flip loss in magnetic confinement of ultracold neutrons for neutron lifetime experiments

Spin flip loss in magnetic confinement of ultracold neutrons for neutron lifetime experiments

Cold and Ultra-cold Neutrons as Probes of New Physics

Radiation Physics and Radionuclide Decay

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