The Large Enriched Germanium Experiment for Neutrinoless &lt;em&gt;ββ&lt;/em&gt; Decay (LEGEND-1000 Preconceptual Design Report)

Massarczyk, Ralph; Chu, Pinghan; Kim, In‐Wook; Elliott, S. R.; Rielage, K.; Meijer, S. J.; Schaper, Danielle; Abgrall, N.

doi:10.2172/1811852

Cited by 4 publications

(5 citation statements)

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“…The next-generation large enriched germanium experiment for neutrinoless β ⁢ β decay (LEGEND) [51] aims to achieve a sensitivity of true0 T 1 / 2 0 ν > 10 28 year by combining the best of GERDA and MJD technologies. The goal is to operate 1 tonne of enriched germanium detectors for 10 years at a background index of ∼ 1 × 10 - 5 counts/kg⋅keV⋅yr.…”

Section: Neutrinoless Double-beta Decaymentioning

confidence: 99%

Experimental neutrino physics in a nuclear landscape

Parno,

Poon,

Singh

2024

Phil. Trans. R. Soc. A.

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There are profound connections between neutrino physics and nuclear experiments. Exceptionally precise measurements of single and double beta-decay spectra illuminate the scale and nature of neutrino mass and may finally answer the question of whether neutrinos are their own anti-matter counterparts. Neutrino–nucleus scattering underpins oscillation experiments and probes nuclear structure, neutrinos offer a rare vantage point into collapsing stars and nuclear fission reactors and techniques pioneered in neutrino nuclear physics experiments are advancing quantum sensing technologies. In this article, we review current and planned efforts at the intersection of neutrino and nuclear experiments. This article is part of the theme issue ‘The liminal position of Nuclear Physics: from hadrons to neutron stars’.

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Section: Neutrinoless Double-beta Decaymentioning

confidence: 99%

Experimental neutrino physics in a nuclear landscape

Parno,

Poon,

Singh

2024

Phil. Trans. R. Soc. A.

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“…The current experimental bound |m ββ | < (36 − 156) meV at 90% C.L. from KamLAND-Zen [348] and the future sensitivity ranges |m ββ | ∼ (9 − 21) meV from LEGEND-1000 [368,369] and |m ββ | ∼ (6 − 27) meV from nEXO [369,370] are indicated by light brown, light green and light yellow horizontal bands respctively. The future sensitivity range |m ββ | ∼ (12 − 34) meV from CUPID [369,371] is within that of other experiments and is omitted in order to make the plot easier to read.…”

Section: Modular Su(5)mentioning

confidence: 99%

Neutrino mass and mixing with modular symmetry

Ding,

King

2024

Rep. Prog. Phys.

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This is a review article about neutrino mass and mixing and flavour model building strategies based on modular symmetry. After an introduction to neutrino mass and lepton mixing, we then turn to the main subject of this review, namely a pedagogical introduction to modular symmetry as a candidate for family symmetry, from the bottom-up point of view. After an informal introduction to modular symmetry, we introduce the modular group, and discuss its fixed points and residual symmetry, assuming supersymmetry throughout. We then introduce finite modular groups of level N and modular forms with integer or rational modular weights, corresponding to simple geometric groups or their double or metaplectic covers, including the most general finite modular groups and vector-valued modular forms, with detailed results for N=2,3,4,5. The interplay between modular symmetry and generalized CP symmetry is discussed, deriving CP transformations on matter multiplets and modular forms, highlighting the CP fixed points and their implications. In general, compactification of extra dimensions generally leads to a number of moduli, and modular invariance with factorizable and non-factorizable multiple moduli based on symplectic modular invariance and automorphic forms is reviewed. Modular strategies for understanding fermion mass hierarchies are discussed, including the weighton mechanism, small deviations from fixed points, and texture zeroes. Then examples of modular models are discussed based on single modulus A4 models, a minimal S′4 model of leptons (and quarks), and a multiple moduli model based on three S4 groups capable of reproducing the Littlest Seesaw model. We then extend the discussion to include Grand Unified Theories (GUTs) based on modular (flipped) SU(5) and SO(10). Finally we discuss top-down approaches, including eclectic flavour symmetry and moduli stabilisation.

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“…0νββ decay is a nuclear decay and thus is a random process obeying Poisson statistics. Given that 0νββ-decay half-life Abgrall et al (2021). Enrichment is performed via gas centrifuge for all isotopes except for 48 Ca, for which the unpublished report by Kishimoto (2018) used electrophoresis (Kishimoto et al, 2015).…”

Section: B Signal Detectionmentioning

confidence: 99%

“…The next-generation Ge-based experiments will be realized in the framework of the LEGEND project (Abgrall et al, 2021), with two stages planned: LEGEND-200 and LEGEND-1000. In the first, ∼200 kg of Ge detectors will be operated in the GERDA setup after upgrading part of the infrastructure.…”

Section: B High-purity Ge Semiconductor Detectorsmentioning

confidence: 99%

Toward the discovery of matter creation with neutrinoless ββ decay

et al. 2023

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The discovery of neutrinoless ββ decay could soon be within reach. This hypothetical ultrarare nuclear decay offers a privileged portal to physics beyond the standard model of particle physics. Its observation would constitute the discovery of a matter-creating process, corroborating leading theories of why the Universe contains more matter than antimatter, and how forces unify at high energy scales. It would also prove that neutrinos and antineutrinos are not two distinct particles but can transform into each other, with their mass described by a unique mechanism conceived by Majorana. The recognition that neutrinos are not massless necessitates an explanation and has boosted interest in neutrinoless ββ decay. The field stands now at a turning point. A new round of experiments is currently being prepared for the next decade to cover an important region of parameter space. In parallel, advances in nuclear theory are laying the groundwork to connect the nuclear decay with the underlying new physics. Meanwhile, the particle theory landscape continues to find new motivations for neutrinos to be their own antiparticle. This review brings together the experimental, nuclear theory, and particle theory aspects connected to neutrinoless ββ decay to explore the path toward, and beyond, its discovery.

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The Large Enriched Germanium Experiment for Neutrinoless <em>ββ</em> Decay (LEGEND-1000 Preconceptual Design Report)

Cited by 4 publications

References 0 publications

Experimental neutrino physics in a nuclear landscape

Experimental neutrino physics in a nuclear landscape

Neutrino mass and mixing with modular symmetry

Toward the discovery of matter creation with neutrinoless ββ decay

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