LENS: A new university-based neutron source for science and education

Leuschner, M.; Baxter, David V.; Derunchuk, V.P.; Kaiser, H.; Lavelle, C. M.; Nann, H.; Remmes, Nicholas B.; Rinckel, T.; Snow, W. M.; Sokol, P. E.

doi:10.1016/j.nimb.2007.03.108

Cited by 11 publications

(5 citation statements)

References 4 publications

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“…The efficiencies and the spatial uniformity of the supermirror neutron polarizer and analyzer were measured at the Low Energy Neutron Source (LENS) at Indiana University [35,36]. We found each device produced P > 0.95 and A > 0.95 over the cold neutron spectrum, consistent with simulations and the data provided by the manufacturer.…”

Section: Data Acquisition and Apparatus Characterizationsupporting

confidence: 71%

A search for possible long range spin dependent interactions of the neutron from exotic vector boson exchange

et al. 2018

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We present a search for possible spin dependent interactions of the neutron with matter through exchange of spin 1 bosons with axial vector couplings as envisioned in possible extensions of the Standard Model. This was sought using a slow neutron polarimeter that passed transversely polarized slow neutrons by unpolarized slabs of material arranged so that interactions would tilt the plane of polarization and develop a component along the neutron momentum. The result for the rotation angle, φ = [2.8 ± 4.6(stat.) ± 4.0(sys.)] × 10 −5 rad/m is consistent with zero. This result improves the upper bounds on the neutron-matter coupling g 2 A by about three orders of magnitude for force ranges in the mm -µm regime.in the 1 meV to 1 eV range and with very weak couplings to matter has begun to attract renewed scientific attention. Particles which might act as the mediators are sometimes referred to generically as WISPs (Weakly-Interacting sub-eV Particles) [1,2] in recent theoretical literature. Many theories beyond the Standard Model, including string theories, possess extended symmetries which, when broken at a high energy scale, lead to weakly-coupled light

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Section: Data Acquisition and Apparatus Characterizationsupporting

confidence: 71%

A search for possible long range spin dependent interactions of the neutron from exotic vector boson exchange

et al. 2018

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“…Research facilities exist where this work can be carried out effectively. Two of these facilities are ILL and the Indiana University Low Energy Neutron Source (LENS) [178]. 3.…”

Section: Conclusion and Avenues For Future Workmentioning

confidence: 99%

Neutron-antineutron oscillations: Theoretical status and experimental prospects

et al. 2016

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The observation of neutrons turning into antineutrons would constitute a discovery of fundamental importance for particle physics and cosmology. Observing the n−n transition would show that baryon number (B) is violated by two units and that matter containing neutrons is unstable. It would provide a clue to how the matter in our universe might have evolved from the B = 0 early universe. If seen at rates observable in foreseeable next-generation experiments, it might well help us understand the observed baryon asymmetry of the universe. A demonstration of the violation of B − L by 2 units would have a profound impact on our understanding of phenomena beyond the Standard Model of particle physics.Slow neutrons have kinetic energies of a few meV. By exploiting new slow neutron sources and optics technology developed for materials research, an optimized search for oscillations using free neutrons from a slow neutron moderator could improve existing limits on the free oscillation probability by at least three orders of magnitude. Such an experiment would deliver a slow neutron beam through a magnetically-shielded vacuum chamber to a thin annihilation target surrounded by a low-background antineutron annihilation detector. Antineutron annihilation in a target downstream of a free neutron beam is such a spectacular experimental signature that an essentially background-free search is possible. An authentic positive signal can be extinguished by a very small change in the ambient magnetic field in such an experiment. It is also possible to improve the sensitivity of neutron oscillation searches in nuclei using large underground detectors built mainly to search for proton decay and detect neutrinos. This paper summarizes the relevant theoretical developments, outlines some ideas to improve experimental searches for free neutron oscillations, and suggests avenues both for theoretical investigation and for future improvement in the experimental sensitivity.

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“…), and the possibility of hands-on maintenance of parts of the cooling loop. As an added bonus, the design here considered may profit from the experience of other beryllium-water based facilities, such as in operation at LENS [12] or the system built at the National Institute of Radiological Sciences (NIRS) Center (Chiba, Japan) [13]. However both are stationary targets which operate at a far lower power (8 kW for LENS and 3.2 kW for NIRS) than that delivered by the ESS-Bilbao accelerator.…”

Section: Conceptual Target Designmentioning

confidence: 99%

Conceptual design of the beryllium rotating target for the ESS-Bilbao facility

Terrón

Sordo

Magán

et al. 2013

Nuclear Instruments and Methods in Physics Research Section A:

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The ESS-Bilbao facility, hosted by the University of the Basque Country (UPV/EHU), envisages the operation of a high-current proton accelerator delivering beams with energies up to 50 MeV. The timeaveraged proton current will be 2.25 mA, delivered by 1.5 ms proton pulses with a repetition rate of 20 Hz. This beam will feed a neutron source based upon the Be (p,n) reaction, which will enable the provision of relevant neutron experimentation capabilities. The neutron source baseline concept consists in a rotating beryllium target cooled by water. The target structure will comprise a rotatable disk made of 6061-T6 aluminium alloy holding 20 beryllium plates. Heat dissipation from the target relies upon a distribution of coolant-flow channels. The practical implementation of such a concept is here described with emphasis put on the beryllium plates thermo-mechanical optimization, the chosen coolant distribution system as well as the mechanical behavior of the assembly.

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LENS: A new university-based neutron source for science and education

Cited by 11 publications

References 4 publications

A search for possible long range spin dependent interactions of the neutron from exotic vector boson exchange

A search for possible long range spin dependent interactions of the neutron from exotic vector boson exchange

Neutron-antineutron oscillations: Theoretical status and experimental prospects

Conceptual design of the beryllium rotating target for the ESS-Bilbao facility

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