Status of <sup>48</sup>Ca double beta decay search and its future prospect in CANDLES

Tetsuno, K.; Ajimura, S.; Akutagawa, K.; Batpurev, T.; Chan, W. M.; Fushimi, K.; Hazama, R.; Iida, Tsutomu; Ikeyama, Y.; Khai, B. T.; Kishimoto, T.; Lee, K. K.; Li, X.; Matsuoka, K.; Mizukoshi, K.; Mori, Y.; Nakajima, K.; Noithong, P.; Nomachi, M.; Ogawa, Izumi; Ohsumi, H.; Ozawa, K.; Shimizu, Kiyotaka; Shokati, M.; Soberi, F.; Suzuki, K.; Takemoto, Y.; Takihira, Y.; Tamagawa, Y.; Tozawa, M.; Trang, V. T. T.; Umehara, S.; Yamamoto, K.; Yoshida, S.; Kim, I; Kwon, Do Hoon; Kim, H L; Lee, H J; Lee, M K; Kim, Y H

doi:10.1088/1742-6596/1468/1/012132

Cited by 23 publications

(19 citation statements)

References 1 publication

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“…[40,43], while a contact term of natural size affects ∆I = 0 transitions such as nn → ppe − e − at the (10-20)% level, its effect is amplified to the level of (50-70)% in ∆I = 2 nuclear transitions due to a node in the matrix element density. The size of the effect in realistic 0νββ nuclear transitions can now be addressed, greatly reducing a crucial uncertainty in the interpretation of future experimental searches [111][112][113][114][115][116][117].…”

Section: Jhep05(2021)289 8 Conclusionmentioning

confidence: 99%

Determining the leading-order contact term in neutrinoless double β decay

Cirigliano

Dekens

Vries

et al. 2021

J. High Energ. Phys.

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We present a method to determine the leading-order (LO) contact term contributing to the nn → ppe−e− amplitude through the exchange of light Majorana neutrinos. Our approach is based on the representation of the amplitude as the momentum integral of a known kernel (proportional to the neutrino propagator) times the generalized forward Compton scattering amplitude n(p1)n(p2)W+(k) →$$ p\left({p}_1^{\prime}\right)p\left({p}_2^{\prime}\right){W}^{-}(k) $$ p p 1 ′ p p 2 ′ W − k , in analogy to the Cottingham formula for the electromagnetic contribution to hadron masses. We construct model-independent representations of the integrand in the low- and high-momentum regions, through chiral EFT and the operator product expansion, respectively. We then construct a model for the full amplitude by interpolating between these two regions, using appropriate nucleon factors for the weak currents and information on nucleon-nucleon (NN) scattering in the 1S0 channel away from threshold. By matching the amplitude obtained in this way to the LO chiral EFT amplitude we obtain the relevant LO contact term and discuss various sources of uncertainty. We validate the approach by computing the analog I = 2 NN contact term and by reproducing, within uncertainties, the charge-independence-breaking contribution to the 1S0NN scattering lengths. While our analysis is performed in the $$ \overline{\mathrm{MS}} $$ MS ¯ scheme, we express our final result in terms of the scheme-independent renormalized amplitude $$ {\mathcal{A}}_{\nu}\left(\left|\mathbf{p}\right|,\left|\mathbf{p}^{\prime}\right|\right) $$ A ν p p ′ at a set of kinematic points near threshold. We illustrate for two cutoff schemes how, using our synthetic data for $$ {\mathcal{A}}_{\nu } $$ A ν , one can determine the contact-term contribution in any regularization scheme, in particular the ones employed in nuclear-structure calculations for isotopes of experimental interest.

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Section: Jhep05(2021)289 8 Conclusionmentioning

confidence: 99%

Determining the leading-order contact term in neutrinoless double β decay

Cirigliano

Dekens

Vries

et al. 2021

J. High Energ. Phys.

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“…The CANDLES experiment is using CaF 2 crystals as scintillators, and recently deployed a strategy for the development of CaF 2 bolometric detectors. Bolometric measurements both with doped CaF 2 (Eu) [69] and pure CaF 2 crystals [28] were performed. The results obtained show a very good discrimination between γ(β)/α bands (see Figure 10), above 5σ in both cases.…”

Section: Amore Experimentsmentioning

confidence: 99%

Bolometric Double Beta Decay Experiments: Review and Prospects

Zolotarova

2021

Symmetry

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This review aims to cover the history and recent developments on cryogenic bolometers for neutrinoless double beta decay (0ν2β) searches. A 0ν2β decay observation would confirm the total lepton charge non-conservation, which is related to a global U(1)LC symmetry. This discovery would also provide essential information on neutrino masses and nature, opening the door to new physics beyond the Standard Model. The bolometric technology shows good prospects for future ton-scale experiments that aim to fully investigate the inverted ordering region of neutrino masses. The big advantage of bolometers is the high energy resolution and the possibility of particle identification, as well as various methods of additional background rejection. The CUORE experiment has proved the feasibility of ton-scale cryogenic experiments, setting the most stringent limit on 130Te 0ν2β decay. Two CUPID demonstrators (CUPID-0 and CUPID-Mo) have set the most stringent limits on 82Se and 100Mo isotopes, respectively, with compatibly low exposures. Several experiments are developing new methods to improve the background in the region of interest with bolometric detectors. CUPID and AMoRE experiments aim to cover the inverted hierarchy region, using scintillating bolometers with hundreds of kg of 100Mo. We review all of these efforts here, with a focus on the different types of radioactive background and the measures put in place to mitigate them.

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“…For example, nuclear physics plays a pivotal role in searches for neutrinoless double beta (0νββ) decays, which are the subject of an intense experimental research program [1][2][3][4][5][6][7][8][9][10][11][12][13][14]. In these decays, two neutrons inside the nucleus decay into two protons via the exchange of a neutrino, emitting two electrons.…”

Section: Introductionmentioning

confidence: 99%

Weak Transitions in Light Nuclei

et al. 2020

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Nuclei are used for high-precision tests of the Standard Model and for studies of physics beyond the Standard Model. Without a thorough understanding of nuclei, we will not be able to meaningfully interpret the growing body of experimental data nor will we be able to disentangle new physics signals from underlying nuclear effects. This calls for accurate calculations of nuclear structure and reactions. In this work, we focus on electroweak decays in nuclei with mass number A ≤ 10 and report on ab initio Quantum Monte Carlo calculations of reduced matrix elements entering beta decays and electron captures in nuclei with mass number A ≤ 10. The many-body wave functions are calculated using selected Norfolk two-and three-nucleon potential models and associated one-and two-body axial currents at tree-level obtained from a chiral effective field theory with pions, nucleons, and. The agreement with the experimental data is satisfactory except for transitions in A = 8 nuclei. In this specific case, the theory significantly underpredicts the experimental data, which indicates the need of further improvements in the corresponding nuclear wave functions. In this study, emphasis is placed on the contributions of two-body axial currents that are carefully analyzed using two-body transition densities. This allow us to study the spatial distribution and short-range behavior of two-body dynamics. In particular, the transition densities when scaled to peak at 1.0 exhibit universal short-range behavior across the considered nuclei, while they differ in the long-range tails.

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Status of ⁴⁸Ca double beta decay search and its future prospect in CANDLES

Cited by 23 publications

References 1 publication

Determining the leading-order contact term in neutrinoless double β decay

Determining the leading-order contact term in neutrinoless double β decay

Bolometric Double Beta Decay Experiments: Review and Prospects

Weak Transitions in Light Nuclei

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Status of 48Ca double beta decay search and its future prospect in CANDLES

Cited by 23 publications

References 1 publication

Determining the leading-order contact term in neutrinoless double β decay

Determining the leading-order contact term in neutrinoless double β decay

Bolometric Double Beta Decay Experiments: Review and Prospects

Weak Transitions in Light Nuclei

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Product

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Status of ⁴⁸Ca double beta decay search and its future prospect in CANDLES