Characterization of a scintillating lithium glass ultra-cold neutron detector

Jamieson, B.; Rebenitsch, L.; Hansen-Romu, S.; Lauss, B.; Lindner, T.; Mammei, R.; Martin, J. W.; Pierre, E.

doi:10.1140/epja/i2017-12195-7

Cited by 8 publications

(7 citation statements)

References 29 publications

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“…The total volume of the UCN-production volume and UCN guides is 60.8 L. The foil separates the helium-filled UCN guide from the detector vacuum to reduce contamination of the source. The main detector uses photomultiplier tubes to detect scintillation light produced by UCNs captured in 6 Li-enriched glass [23]. A secondary 3 He proportional counter with its own aluminium window is mounted to a 5 mm pinhole in the guide, see Fig.…”

Section: Description Of the Sourcementioning

confidence: 99%

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First ultracold neutrons produced at TRIUMF

Ahmed¹,

Altiere²,

Andalib³

et al. 2019

Phys. Rev. C

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We installed a source for ultracold neutrons at a new, dedicated spallation target at TRIUMF. The source was originally developed in Japan and uses a superfluid-helium converter cooled to 0.9 K. During an extensive test campaign in November 2017, we extracted up to 325 000 ultracold neutrons after a one-minute irradiation of the target, over three times more than previously achieved with this source. The corresponding ultracold-neutron density in the whole production and guide volume is 5.3 cm −3 . The storage lifetime of ultracold neutrons in the source was initially 37 s and dropped to 24 s during the eighteen days of operation. During continuous irradiation of the spallation target, we were able to detect a sustained ultracold-neutron rate of up to 1500 s −1 .Simulations of UCN production, UCN transport, temperature-dependent UCN yield, and temperature-dependent storage lifetime show excellent agreement with the experimental data and confirm that the ultracold-neutron-upscattering rate in superfluid helium is proportional to T 7 .

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Section: Description Of the Sourcementioning

confidence: 99%

“…We set the losses in the foil according to measurements performed by [26]. We modeled the main detector with its two scintillator layers [23] and their corresponding Fermi potentials and absorption cross sections, as stated in [27].…”

Section: Comparison With Simulationsmentioning

confidence: 99%

First ultracold neutrons produced at TRIUMF

Ahmed¹,

Altiere²,

Andalib³

et al. 2019

Phys. Rev. C

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“…After the Ramsey cycle, four Li-glass scintillation detectors [22], two connected to each EDM cell, count the neutrons. A spin flipper and a spin analyzer using a magnetized iron film coated onto an aluminum foil are placed on top of each detector.…”

Section: Edm Experimentsmentioning

confidence: 99%

Estimated performance of the TRIUMF ultracold neutron source and electric dipole moment apparatus

Sidhu

Schreyer²,

Vanbergen³

et al. 2023

EPJ Web Conf.

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Searches for the permanent electric dipole moment of the neutron (nEDM) provide strong constraints on theories beyond the Standard Model of particle physics. The TUCAN collaboration is constructing a source for ultra-cold neutrons (UCN) and an apparatus to search for the nEDM at TRIUMF, Vancouver, Canada. In this work, we estimate that the spallation-driven UCN source based on a superfluid helium converter will provide (1.38 ± 0.02) 107 polarized UCN at a density of 217 ± 3 UCN/cm3 to a room-temperature EDM experiment per fill. With (1.43 ± 0.02) 106 neutrons detected after the Ramsey cycle, the statistical sensitivity for an nEDM search per storage cycle will be (1.94 ± 0.06) × 10−25 ecm (1σ). The goal sensitivity of 10−27 ecm (1σ) can be reached within 281 ± 16 measurement days.

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“…To determine the scintillation light yield, generally, pulse height spectroscopy has been used. In this measurement, 662 keV γ-rays from 137 Cs are irradiated to the sample, and a photoabsorption peak is generally observed. By comparing relative photoabsorption peak channels of the sample and reference which scintillation light yield is known, a number of photoelectrons by 662 keV energy deposition can be calculated.…”

Section: Introductionmentioning

confidence: 99%

“…In this system, not a pulse height but a pulse area of each event (pulse) is accumulated, and finally the obtained spectrum has the same meaning as a typical pulse height spectrum. By using this system, scintillation light yields under 662 keV γ-ray irradiations from 137 Cs of Tb 3+ -doped scintillators were successfully evaluated. 57)…”

Section: Introductionmentioning

confidence: 99%