Charged-current neutrino-nucleus scattering off Xe isotopes

Pirinen, Pekka; Suhonen, J.; Ydrefors, E.

doi:10.1103/physrevc.99.014320

“…• pnQRPA with a schematic δ force [160] • RPA and pnRPA with Skyrme type of interactions, as used in [425,427,433,450] • QRPA and pnQRPA (see Sec. 3.1.1 for more information) with Skyrme type of interactions [425,427,444,452,453] [416], [417], [418], [419] [132], [134], [415], [417], [418], [420], [421], [422], [423] [352,362,364,436,438,441,442,443,445,446,447,448,449,451].…”

Section: Neutrino-nucleus Scattering Calculationsmentioning

confidence: 99%

Neutrino–nuclear responses for astro-neutrinos, single beta decays and double beta decays

Ejiri

¹

,

Suhonen

²

,

Zuber

³

2019

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Neutrino-nuclear responses associated with astro-neutrinos, single beta decays and double beta decays are crucial in studies of neutrino properties of interest for astro-particle physics. The present report reviews briefly recent studies of the neutrino-nuclear responses from both experimental and theoretical points of view in order to obtain a consistent understanding of the many facets of the neutrino-nuclear responses. Subjects discussed in this review include (i) experimental studies of neutrino-nuclear responses by means of single beta decays, charge-exchange nuclear reactions, muon-photon-and neutrino-nuclear reactions, and nucleon-transfer reactions, (ii) implications of and discussions on neutrino-nuclear responses for single beta decays, for astroneutrinos, and for astro-neutrino nucleosynthesis, (iii) theoretical aspects of neutrino-nuclear responses for beta and double beta decays, for nuclear muon capture and for neutrino-nucleus scattering, and (iv) critical discussions on nucleonic and non-nucleonic spin-isospin correlations and renormalization (quenching or enhancement) effects on the axial weak coupling. Remarks are given on perspectives of experimental and theoretical studies of the neutrino-nuclear responses and on future experiments of double beta decays.

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“…In LZ this process can occur on any of the naturally present xenon isotopes, and can produce a background from both the prompt emission of an energetic electron and the subsequent decay of the produced cesium nucleus. The prompt e − emitted from the neutrino capture in any Xe isotope is expected to have an energy far greater than Q ββ and the prompt de-excitation of the Cs nucleus will likely produce several gammas that can be tagged as multiple scatters with high efficiency [6,[49][50][51]. The only isotope of cesium that can produce a background in LZ is 136 Cs, since all other isotopes either decay via β + emission that can easily be tagged or do not have enough energy to generate a background at Q ββ .…”

Section: F Other Backgroundsmentioning

confidence: 99%

Projected sensitivity of the LUX-ZEPLIN experiment to the 0νββ decay of Xe136

Akerib¹,

Akerlof²,

Alqahtani³

et al. 2020

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The LUX-ZEPLIN (LZ) experiment will enable a neutrinoless double beta decay search in parallel to the main science goal of discovering dark matter particle interactions. We report the expected LZ sensitivity to 136 Xe neutrinoless double beta decay, taking advantage of the significant (>600 kg) 136 Xe mass contained within the active volume of LZ without isotopic enrichment. After 1000 livedays, the median exclusion sensitivity to the half-life of 136 Xe is projected to be 1.06×10 26 years (90% confidence level), similar to existing constraints. We also report the expected sensitivity of a possible subsequent dedicated exposure using 90% enrichment with 136 Xe at 1.06×10 27 years.

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“…The cross-sections as a function of energy were computed in Ref. [58], and were obtained in tabular form from the authors.…”

Section: Charged-current Scattering Of (Anti)neutrinosmentioning

confidence: 99%

“…The energy-averaged crosssection for these reactions is tabulated in Ref. [58], and is of O 10 −42 − 10 −41 cm 2 . This may produce 10's of events per tonne-year for each isotope in a nat Xe detector.…”

Section: Charged-current Scattering Of (Anti)neutrinosmentioning

confidence: 99%

“…Again using the 8 B-averaged cross sections from Ref. [58], we calculate a production rate of 0.02 nuclei of 128 Cs and 0.07 nuclei of 130 Cs per tonne-year of nat Xe exposure. The resulting β + decays are distributed across a broad spectrum, and our simulations indicate that they will be a small background for the 2νECβ + process, with expected rates an order of magnitude lower than the expected signal rate.…”

Section: Charged-current Scattering Of (Anti)neutrinosmentioning

confidence: 99%

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Detection prospects for the second-order weak decays of $$^{124}$$Xe in multi-tonne xenon time projection chambers

Wittweg

¹

,

Lenardo

²

,

Fieguth

³

et al. 2020

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We investigate the detection prospects for two-neutrino and neutrinoless second-order weak decays of $$^{124}{\mathrm{Xe}}$$ 124 Xe – double-electron capture ($$0/2\upnu \text {ECEC}$$ 0 / 2 ν ECEC ), electron capture with positron emission ($$0/2\upnu \text {EC}\upbeta ^+$$ 0 / 2 ν EC β + ) and double-positron emission ($$0/2\upnu \upbeta ^+\upbeta ^+$$ 0 / 2 ν β + β + ) – in multi-tonne xenon time projection chambers. We simulate the decays in a liquid xenon medium and develop a reconstruction algorithm which uses the multi-particle coincidence in these decays to separate signal from background. This is used to compute the expected detection efficiencies as a function of position resolution and energy threshold for planned experiments. In addition, we consider an exhaustive list of possible background sources and find that they are either negligible in rate or can be greatly reduced using our topological reconstruction criteria. In particular, we draw two conclusions: First, with a theoretical half-life of $$T_{1/2}^{2\upnu \text {EC}\upbeta ^+} = (1.7 \pm 0.6)\cdot 10^{23}\,\text {year}$$ T 1 / 2 2 ν EC β + = ( 1.7 ± 0.6 ) · 10 23 year , the $$2\upnu \text {EC}\upbeta ^{+}$$ 2 ν EC β + decay of $$^{124}$$ 124 Xe will likely be detected in upcoming Dark Matter experiments (e.g. XENONnT or LZ), and their major background will be $$\upgamma $$ γ -rays from detector construction materials. Second, searches for the $$0\upnu \text {EC}\upbeta ^+$$ 0 ν EC β + decay mode will likely be background-free, and new parameter space may be within reach. To this end we investigate two different scenarios of existing experimental constraints on the effective neutrino mass. The necessary 500 kg-year exposure of $$^{124}$$ 124 Xe could be achieved by the baseline design of the DARWIN observatory, or by extracting and using the $$^{124}$$ 124 Xe from the tailings of the nEXO experiment. We demonstrate how a combination of $$^{124}$$ 124 Xe results with those from $$0\upnu \upbeta ^-\upbeta ^-$$ 0 ν β - β - searches in $$^{136}$$ 136 Xe could help to identify the neutrinoless decay mechanism.

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Charged-current neutrino-nucleus scattering off Xe isotopes

Cited by 13 publications

References 55 publications

Neutrino–nuclear responses for astro-neutrinos, single beta decays and double beta decays

Neutrino–nuclear responses for astro-neutrinos, single beta decays and double beta decays

Projected sensitivity of the LUX-ZEPLIN experiment to the 0νββ decay of Xe136

Detection prospects for the second-order weak decays of $$^{124}$$Xe in multi-tonne xenon time projection chambers

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