SNO and SNO+

Chen, M. C.

doi:10.1063/1.2818544

Cited by 16 publications

(10 citation statements)

References 4 publications

(4 reference statements)

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“…There are a variety of experiments that are studying neutrinoless double-β decay in 150 Nd. The current experimental techniques to study this isotope rely on kilotons of liquid scintillator and estimate a 3% energy resolution [60]. Our analysis did not reveal any known levels with γ -ray transitions in the immediate vicinity of the end-point energy of this decay.…”

Section: Cross Sections Relevant To 0νββ Decay Searchesmentioning

confidence: 63%

Neutron inelastic scattering in natural Cu as a background in neutrinoless double-βdecay experiments

Boswell

Elliott²,

Perepelitsa³

et al. 2013

Phys. Rev. C

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Background: Experiments designed to study rare processes, such as neutrinoless double-β decay (0νββ), are crucial tests for physics beyond the standard model. These experiments rely on reducing the intrinsic radioactive background to unprecedented levels, while adequately shielding the detectors from external sources of radioactivity. Purpose: The purpose of this work is focused on understanding the background rates from neutron interactions in Cu shielding in regions around the Q values of many candidate 0νββ decay isotopes, as well as providing data for benchmarking Monte Carlo simulations of background events. Methods: Using the broad-spectrum neutron beam at Los Alamos Neutron Science Center, we have measured γ rays emitted from inelastic neutron scattering on nat Cu. Results: We extracted the level cross sections from the γ -production cross section for 46 energy levels in nat Cu. These level cross sections were compared with the available experimental data, as well as the ENDF/B-VII evaluation for discrete levels. Conclusions: For energy levels above 2 MeV we found significant discrepancies between the suggested level cross sections for both nuclei and our data. We found reasonable agreement between our measurement and the ENDF/B-VII evaluation for the total neutron inelastic cross section in 63 Cu. Our measurement of the total neutron inelastic scattering cross section in 65 Cu was 30% lower than the ENDF/B-VII evaluations, which we attribute to unobserved transitions in 65 Cu. Furthermore, we found that the implementation of the ENDF/B-VII evaluation in simulations did not properly model the decay properties of the nucleus to the degree necessary for estimating backgrounds in rear-event searches. Finally, we examined the potential implications of our measurements on 0νββ measurements and found that many of the commonly studied 0νββ isotopes had Q values below the cutoff for ENDF/B-VII evaluated discrete levels in either Cu nucleus.

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Section: Cross Sections Relevant To 0νββ Decay Searchesmentioning

confidence: 63%

Neutron inelastic scattering in natural Cu as a background in neutrinoless double-βdecay experiments

Boswell

Elliott²,

Perepelitsa³

et al. 2013

Phys. Rev. C

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“…A solvent candidate becoming very popular in the last decade is LAB, mainly due to its superior safety features, good material compatibility, high transparency and low cost. It was first proposed in the context of the SNO+ experiment [9]. On the other hand LAB based scintillators have reduced pulse shape discrimination capabilities and as a mixture of many isomers it does not have a well defined hydrogen or carbon fraction.…”

Section: Solventsmentioning

confidence: 99%

“…Such Nd-loaded LS were for example proposed and prepared in the context of SNO+ [9]. Concentrations of Nd of more than 1% have been tested.…”

Section: Neutrinoless ββ Decay With Neodymiummentioning

confidence: 99%

Metal-loaded organic scintillators for neutrino physics

Buck

Yeh

2016

J. Phys. G: Nucl. Part. Phys.

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Organic liquid scintillators are used in many neutrino physics experiments of the past and present. In particular for low energy neutrinos when realtime and energy information are required, liquid scintillators have several advantages compared to other technologies. In many cases the organic liquid needs to be loaded with metal to enhance the neutrino signal over background events. Several metal loaded scintillators of the past suffered from chemical and optical instabilities, limiting the performance of these neutrino detectors. Different ways of metal loading are described in the article with a focus on recent techniques providing metal loaded scintillators that can be used under stable conditions for many years even in ton scale experiments. Applications of metal loaded scintillators in neutrino experiments are reviewed and the performance as well as the prospects of different scintillator types are compared.

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“…SNO+ SNO+, the upgraded Sudbury Neutrino Observatory (SNO) is a 12 m diameter liquid scintillator, situated at ≈ 6000 m.w.e. [49]. The detector features a significant light-yield upgrade over its predecessor, and chief amongst its current science goals are neutrino-flux measurements from the pp, CN O cycle, from supernovae, in addition to searching for neutrino-less double-beta decay.…”

Section: Kamlandmentioning

confidence: 99%

MeV-scale dark matter deep underground

2015

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We demonstrate that current and planned underground neutrino experiments could offer a powerful probe of few-MeV dark matter when combined with a nearby high-intensity low-to-medium energy electron accelerator. This experimental setup, an underground beam-dump experiment, is capable of decisively testing the thermal freeze-out mechanism for several natural dark matter scenarios in this mass range. We present the sensitivity reach in terms of the mass-coupling parameter space of existing and planned detectors, such as Super-K, SNO+, and JUNO, in conjunction with a hypothetical 100 MeV energy accelerator. This setup can also greatly extend the sensitivity of direct searches for new light weakly-coupled force-carriers independently of their connection to dark matter.

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SNO and SNO+

Cited by 16 publications

References 4 publications

Neutron inelastic scattering in natural Cu as a background in neutrinoless double-βdecay experiments

Neutron inelastic scattering in natural Cu as a background in neutrinoless double-βdecay experiments

Metal-loaded organic scintillators for neutrino physics

MeV-scale dark matter deep underground

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