Ultracold neutron detectors based on 10B converters used in the qBounce experiments

Jenke, Tobias; Cronenberg, G.; Filter, Hanno; Geltenbort, P.; Klein, Martin; Lauer, T.; Mitsch, Kevin; Saul, Heiko; Seiler, D.; Stadler, David; Thalhammer, Martin; Abele, H.

doi:10.1016/j.nima.2013.06.024

Cited by 23 publications

(35 citation statements)

References 19 publications

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“…These superpositions can be measured experimentally. A spatial resolution detector for the measurement of the squared wave function, i.e., the probability to find a neutron on the neutron mirror, was developed in the past by some of the present authors [16]. Measurements of the neutron density distribution above the mirror can provide a test of Newtonian gravity at short distances.…”

Section: Discussionmentioning

confidence: 99%

Chirped-frequency excitation of gravitationally bound ultracold neutrons

et al. 2017

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Ultracold neutrons confined in the Earth's gravitational field display quantized energy levels that have been observed for over a decade. In recent resonance spectroscopy experiments [T. Jenke et al., Nat. Phys. 7, 468 (2011)], the transition between two such gravitational quantum states was driven by the mechanical oscillation of the plates that confine the neutrons. Here we show that by applying a sinusoidal modulation with slowly varying frequency (chirp), the neutrons can be brought to higher excited states by climbing the energy levels one by one. The proposed experiment should make it possible to observe the quantumclassical transition that occurs at high neutron energies. Furthermore, it provides a technique to realize superpositions of gravitational quantum states, to be used for precision tests of gravity at short distances.

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Section: Discussionmentioning

confidence: 99%

Chirped-frequency excitation of gravitationally bound ultracold neutrons

et al. 2017

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“…[138,152,153]. For a measurement of the probability to find a neutron on the mirror with spatial resolution detectors have been developed [154] based on 10 B converters used in the qBOUNCE experiments.…”

Section: Pos(inpc2016)359mentioning

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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“…2, left, first measured in [31][32][33] in a incoherent superposition. Evidence for states in a coherent superposition can be found in [34][35][36]. The eigenenergies E k are based on the slit width l, the neutron mass m n , the reduced Planck constant , and the acceleration of the earth g. As each transition can be addressed by its unique energy splitting, a combination of two states can be treated as a twolevel system and resonance spectroscopy techniques can be applied [37].…”

Section: Neutron β-Decay and R×b Spectroscopymentioning

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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Ultracold neutron detectors based on 10B converters used in the qBounce experiments

Cited by 23 publications

References 19 publications

Chirped-frequency excitation of gravitationally bound ultracold neutrons

Chirped-frequency excitation of gravitationally bound ultracold neutrons

Cold and Ultra-cold Neutrons as Probes of New Physics

Spectroscopy with cold and ultra-cold neutrons

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