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

Jenke T, Cronenberg G, Filter H, Geltenbort P, Klein M, Lauer T, Mitsch K, Saul H, Seiler D, Stadler D, Thalhammer M, Abele H - Nucl Instrum Methods Phys Res A (2013)

Bottom Line: This is required for searches of hypothetical forces with spin-mass couplings.The mentioned experiments utilize a beam-monitoring concept which accounts for variations in the neutron flux that are typical for nuclear research facilities.They allow one to resolve the quantum mechanical wave function of an ultracold neutron bound in the gravity potential above a neutron mirror.

View Article: PubMed Central - PubMed

Affiliation: Atominstitut TU Wien, Stadionallee 2, 1020 Wien, Austria.

ABSTRACT

Gravity experiments with very slow, so-called ultracold neutrons connect quantum mechanics with tests of Newton's inverse square law at short distances. These experiments face a low count rate and hence need highly optimized detector concepts. In the frame of this paper, we present low-background ultracold neutron counters and track detectors with micron resolution based on a (10)B converter. We discuss the optimization of (10)B converter layers, detector design and concepts for read-out electronics focusing on high-efficiency and low-background. We describe modifications of the counters that allow one to detect ultracold neutrons selectively on their spin-orientation. This is required for searches of hypothetical forces with spin-mass couplings. The mentioned experiments utilize a beam-monitoring concept which accounts for variations in the neutron flux that are typical for nuclear research facilities. The converter can also be used for detectors, which feature high efficiencies paired with high spatial resolution of [Formula: see text]. They allow one to resolve the quantum mechanical wave function of an ultracold neutron bound in the gravity potential above a neutron mirror.

No MeSH data available.


Related in: MedlinePlus

UCN form gravitationally bound quantum states above a horizontal mirror. On the left side, the first five eigen-states and -energies of neutrons in a horizontal slit between two mirrors are shown. These mirrors form infinitely high potential walls, drawn in black. The figure on the right side shows a corresponding experimental setup to measure incoherent superpositions of these states (right, adapted from: [32, Fig. 5.1, p. 61]).
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f0060: UCN form gravitationally bound quantum states above a horizontal mirror. On the left side, the first five eigen-states and -energies of neutrons in a horizontal slit between two mirrors are shown. These mirrors form infinitely high potential walls, drawn in black. The figure on the right side shows a corresponding experimental setup to measure incoherent superpositions of these states (right, adapted from: [32, Fig. 5.1, p. 61]).

Mentions: Fig. 12 shows on the left side the Schrödinger-wave function for the first five states n, when a neutron traverses a slit between two mirrors in the gravity potential of the earth. can be interpreted as the probability of detecting a neutron above the mirror with state populations in an incoherent superposition. The right side of Fig. 12 shows the corresponding experimental setup. Spatial resolution detectors visualize ultracold neutron density distributions behind the mirrors. Fig. 13 displays a measurement of the incoherent superposition of gravitationally bound quantum states. 70% of the neutrons are found in state one and 30% are found in state two.


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

Jenke T, Cronenberg G, Filter H, Geltenbort P, Klein M, Lauer T, Mitsch K, Saul H, Seiler D, Stadler D, Thalhammer M, Abele H - Nucl Instrum Methods Phys Res A (2013)

UCN form gravitationally bound quantum states above a horizontal mirror. On the left side, the first five eigen-states and -energies of neutrons in a horizontal slit between two mirrors are shown. These mirrors form infinitely high potential walls, drawn in black. The figure on the right side shows a corresponding experimental setup to measure incoherent superpositions of these states (right, adapted from: [32, Fig. 5.1, p. 61]).
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4375608&req=5

f0060: UCN form gravitationally bound quantum states above a horizontal mirror. On the left side, the first five eigen-states and -energies of neutrons in a horizontal slit between two mirrors are shown. These mirrors form infinitely high potential walls, drawn in black. The figure on the right side shows a corresponding experimental setup to measure incoherent superpositions of these states (right, adapted from: [32, Fig. 5.1, p. 61]).
Mentions: Fig. 12 shows on the left side the Schrödinger-wave function for the first five states n, when a neutron traverses a slit between two mirrors in the gravity potential of the earth. can be interpreted as the probability of detecting a neutron above the mirror with state populations in an incoherent superposition. The right side of Fig. 12 shows the corresponding experimental setup. Spatial resolution detectors visualize ultracold neutron density distributions behind the mirrors. Fig. 13 displays a measurement of the incoherent superposition of gravitationally bound quantum states. 70% of the neutrons are found in state one and 30% are found in state two.

Bottom Line: This is required for searches of hypothetical forces with spin-mass couplings.The mentioned experiments utilize a beam-monitoring concept which accounts for variations in the neutron flux that are typical for nuclear research facilities.They allow one to resolve the quantum mechanical wave function of an ultracold neutron bound in the gravity potential above a neutron mirror.

View Article: PubMed Central - PubMed

Affiliation: Atominstitut TU Wien, Stadionallee 2, 1020 Wien, Austria.

ABSTRACT

Gravity experiments with very slow, so-called ultracold neutrons connect quantum mechanics with tests of Newton's inverse square law at short distances. These experiments face a low count rate and hence need highly optimized detector concepts. In the frame of this paper, we present low-background ultracold neutron counters and track detectors with micron resolution based on a (10)B converter. We discuss the optimization of (10)B converter layers, detector design and concepts for read-out electronics focusing on high-efficiency and low-background. We describe modifications of the counters that allow one to detect ultracold neutrons selectively on their spin-orientation. This is required for searches of hypothetical forces with spin-mass couplings. The mentioned experiments utilize a beam-monitoring concept which accounts for variations in the neutron flux that are typical for nuclear research facilities. The converter can also be used for detectors, which feature high efficiencies paired with high spatial resolution of [Formula: see text]. They allow one to resolve the quantum mechanical wave function of an ultracold neutron bound in the gravity potential above a neutron mirror.

No MeSH data available.


Related in: MedlinePlus