$γγ$ decay as a probe of neutrinoless $ββ$ decay nuclear matrix elements

Romeo, B.; Menéndez, J.; Peña, C.

doi:10.48550/arxiv.2102.11101

Cited by 3 publications

(3 citation statements)

References 76 publications

(98 reference statements)

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“…Nonetheless, if and to what extent 0νββ-decay NMEs need to be corrected remains an open question [5,38]. A complementary avenue is to use nuclear physics experiments to constrain the NMEs [39][40][41][42][43][44], but observables well correlated with 0νββ decay are also hard to access [45,46]. In sum, NME uncertainties complicate the extraction of additional physics information from 0νββ-decay experiments.…”

Section: Introductionmentioning

confidence: 99%

Impact of the leading-order short-range nuclear matrix element on the neutrinoless double-beta decay of medium-mass and heavy nuclei

Jokiniemi,

Soriano,

Menéndez

2021

Preprint

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We evaluate the leading-order short-range nuclear matrix element for the neutrinoless double-beta (0νββ) decay of the nuclei most relevant for experiments, including 76 Ge, 100 Mo, 130 Te and 136 Xe. In our calculations, performed with the nuclear shell model and proton-neutron quasiparticle random-phase approximation (pnQRPA) methods, we estimate the coupling of this term by the contact charge-independence-breaking coupling of various nuclear Hamiltonians. Our results suggest a significant impact of the short-range matrix element, which is about 15% − 50% and 30% − 80% of the standard 0νββ-decay long-range matrix element for the shell model and pnQRPA, respectively. Combining the full matrix elements with the results from current 0νββ-decay experiments we find that, if both matrix elements carry the same sign, these searches move notably toward probing the inverted mass ordering of neutrino masses.

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Section: Introductionmentioning

confidence: 99%

Impact of the leading-order short-range nuclear matrix element on the neutrinoless double-beta decay of medium-mass and heavy nuclei

Jokiniemi,

Soriano,

Menéndez

2021

Preprint

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“…Electromagnetic decays connect states in the same nucleus, so that a relation with 0νββ decay can only be expected in the final ββ-decay system, when the initial state is the double isobaric analogue -the state with the same nuclear structure but rotated in isospin space -of the initial ββ-decay state. A recent study finds a linear correlation between γγ magnetic dipole and 0νββ-decay NMEs in the shell model framework (Romeo et al, 2021), opening the door to exploring 0νββ decay with nuclear spectroscopy.…”

Section: E Connections To Nuclear Structure Measurementsmentioning

confidence: 99%

Toward the discovery of matter creation with neutrinoless double-beta decay

Agostini¹,

Benato²,

Detwiler³

et al. 2022

Preprint

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The discovery of neutrinoless double-beta decay could soon be within reach. This hypothetical ultra-rare nuclear decay is a portal to new physics beyond the Standard Model. 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 the 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, generating their own mass in the process. The recognition that neutrinos are not massless necessitates an explanation and has boosted interest in neutrinoless double-beta decay. The field is 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. Advancements 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 double-beta decay, to explore the path toward -and beyond -its discovery.

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“…However, pairing energy is not observable, this correlation cannot provide a model-independent way to constraint the NME directly. In recent years, Shimizu et al [376] and Romeo et al [379] demonstrated that there is a rather strong correlation between the NMEs of 0νββ decays M 0ν with the ground-state-to-ground-state double Gamow-Teller (DGT) transition strength M DGT…”

Section: Constraints With Correlation Relationsmentioning

confidence: 99%

Beyond-mean-field approaches for nuclear neutrinoless double beta decay in the standard mechanism

Yao,

Meng,

Niu

et al. 2021

Preprint

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Nuclear weak decays provide important probes to fundamental symmetries in nature. A precise description of these processes in atomic nuclei requires comprehensive knowledge on both the strong and weak interactions in the nuclear medium and on the dynamics of quantum many-body systems. In particular, an observation of the hypothetical double beta decay without emission of neutrinos (0νββ) would unambiguously demonstrate the Majorana nature of neutrinos and the existence of the lepton-number-violation process. It would also provide unique information on the ordering and absolute scale of neutrino masses. The next-generation tonne-scale experiments with sensitivity up to 10 28 years after a few years of running will probably provide a definite answer to these fundamental questions based on our current knowledge on the nuclear matrix element (NME), the precise determination of which is a challenge to nuclear theory. Beyond-mean-field approaches have been frequently adapted for the studies of nuclear structure and decay throughout nuclear chart for several decades. In this review, we summarize the status of beyond-mean-field calculations of the NMEs of 0νββ decay assuming the standard mechanism of an exchange of light Majorana neutrinos. The challenges and future prospects in the extension and application of beyond-mean-field approaches for 0νββ decay are discussed. Contents

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$γγ$ decay as a probe of neutrinoless $ββ$ decay nuclear matrix elements

Cited by 3 publications

References 76 publications

Impact of the leading-order short-range nuclear matrix element on the neutrinoless double-beta decay of medium-mass and heavy nuclei

Impact of the leading-order short-range nuclear matrix element on the neutrinoless double-beta decay of medium-mass and heavy nuclei

Toward the discovery of matter creation with neutrinoless double-beta decay

Beyond-mean-field approaches for nuclear neutrinoless double beta decay in the standard mechanism

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