Galactic halo size in the light of recent AMS-02 data

Weinrich, Nathanael; Boudaud, Mathieu; Derome, L.; Génolini, Yoann; Lavalle, Julien; Maurin, D.; Salati, Pierre; Serpico, Pasquale Dario; Weymann-Despres, Gilles

doi:10.1051/0004-6361/202038064

Cited by 87 publications

(148 citation statements)

References 108 publications

(162 reference statements)

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“…The new information provided by the Data-Driven analysis, when applied to PAMELA data, is a relatively precise estimation of 10 Be/ 9 Be ratio in the range 0.2-0.85 GeV/n where existing measurements are scarce and affected by large uncertainty. In particular it is interesting to note that this measurement is in good agreement with the model of [3] that is a recent prediction of 10 Be/ 9 Be ratio tuned with the up-to-date AMS-02 fluxes (and previous low-energy 10 Be/ 9 Be measurements).…”

Section: Resultssupporting

confidence: 86%

“…The precision of PAMELA data improves the knowledge of 10 Be/ 9 Be at "large" energy, with a sizable impact in the measurement of the Galactic halo thickness parameter, currently known in the wide range H = 5 +3 −2 kpc [3]. To quantify the sensitivity of PAMELA measurement to halo thickness parameter, the model of [1] is plotted in fig.…”

Section: Resultsmentioning

confidence: 99%

“…The uncertainties on D and H parameters (this last one know to be in the range 3-8 kpc) also reflects on the accuracy of the determination of secondary anti-proton and positrons fluxes that are the background for the Dark Matter or exotic (astro-)physics searches [2,3].…”

Section: Introductionmentioning

confidence: 99%

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A Data Driven Approach for the Measurement of 10Be/9Be in Cosmic Rays with Magnetic Spectrometers

Nozzoli¹,

Cernetti²

2020

Preprint

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Cosmic Rays (CR) are a powerful tool for the investigation of the structure of the magnetic fields in the galactic halo and the property of the Inter-Stellar Medium. Two parameters of the CR propagation models: the galactic halo thickness, H, and the diffusion coefficient, D, are loosely constrained by current CR flux measurements, in particular a large degeneracy exist being only H/D well measured. The 10Be/9Be isotopic flux ratio (thanks to the 2 My lifetime of 10Be) can be used as a radioactive clock providing the measurement of CR residence time in the galaxy. This is an important tool to solve the H/D degeneracy. Past measurements of 10Be/9Be isotopic flux ratio in CR are scarce, limited to low energy and affected by large uncertainties. Here a new technique to measure 10Be/9Be isotopic flux ratio, with a Data-Driven approach, in magnetic spectrometers is presented. As an example by applying the method to Beryllium events published by PAMELA experiment it is now possible to determine the important 10Be/9Be measurement avoiding the prohibitive uncertainties coming from the Monte Carlo simulation. It is shown how the accuracy of PAMELA data permits to infer a value of the halo thickness H within 25% precision.

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Section: Resultssupporting

confidence: 86%

Section: Resultsmentioning

confidence: 99%

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A Data Driven Approach for the Measurement of 10Be/9Be in Cosmic Rays with Magnetic Spectrometers

Nozzoli¹,

Cernetti²

2020

Preprint

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“…[9] (for setup 1) and [11] (for setup 2). In setup 1, a degeneracy between K 0 and L arises and, therefore, L was fixed to the lowest value L = 4 kpc suggested by positron data [9] (the value L = 4 kpc is also motivated from a recent Be/B analysis in the same propagation setup [107], see also Ref. [108]).…”

Section: Appendix C: Cosmic-ray Propagation Parametersmentioning

confidence: 99%

Dark matter or correlated errors: Systematics of the AMS-02 antiproton excess

Heisig

Korsmeier

Winkler

2020

Phys. Rev. Research

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Several studies have pointed out an excess in the AMS-02 antiproton spectrum at rigidities of 10-20 GV. Its spectral properties were found to be consistent with a dark-matter particle of mass 50-100 GeV which annihilates hadronically at roughly the thermal rate. In this paper, we reinvestigate the antiproton excess, including all relevant sources of systematic errors. Most importantly, we perform a realistic estimate of the correlations in the AMS-02 systematic error which could potentially "fake" a dark-matter signal. The dominant systematics in the relevant rigidity range originate from uncertainties in the cross sections for absorption of cosmic rays within the detector material. We calculate their correlations within the Glauber-Gribov theory of inelastic scattering. The AMS-02 correlations enter our spectral search for dark matter in the form of covariance matrices, which we make publicly available for the cosmic-ray community. We find that the global significance of the antiproton excess is reduced to below 1 σ once all systematics, including the derived AMS-02 error correlations, are taken into account. No significant preference for a dark-matter signal in the AMS-02 antiproton data is found in the mass range 10-10 000 GeV.

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“…To illustrate that USINE still enables to address state-of-the-art science questions, here is a brief list of the recent results we obtained: (i) indication of a high-energy break in the diffusion coefficient [19], (ii) list of nuclear cross-sections to improve in order to reach a modelling precision on par with the AMS-02 data 3% precision [20], (iii) improved methodology to analyse and fit without biases high precision data [21], (iv) new benchmark transport parametrisations SLIM/BIG/QUAINT [22,23], (v) consistency of antiproton data with a pure astrophysical origin [24], constraints on the diffusive halo size [25]. Several more studies are on their way, including an update of the Min/Med/Max benchmark parameters and an update of DM constraints from anti-protons.…”

Section: Usine Releases and Recent Results: Why Should You Use Usine?mentioning

confidence: 99%

USINE, CRDB, and CLUMPY tools

Maurin¹

2021

Proceedings of Tools for High Energy Physics and Cosmology — PoS(TOOLS2020)

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In the context of indirect dark matter detection with charged cosmic rays and -rays, several public tools have been developed at LPSC (Laboratoire de Physique Subatomique et Cosmologie). I present a brief overview of these tools, namely USINE for the calculation of astrophysical nuclear fluxes and associated dark matter signals, the cosmic-ray database CRDB to retrieve cosmic-ray data and associated meta-data, and CLUMPY for the calculation of -ray and signals from dark matter structures. I stress the improvements made for the various releases of these tools. I then conclude with ongoing developments and a wish list for future releases. The main emphasis is put on the USINE code and the recent results obtained with it, as it was at the core of the presentation made at this workshop.

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Galactic halo size in the light of recent AMS-02 data

Cited by 87 publications

References 108 publications

A Data Driven Approach for the Measurement of 10Be/9Be in Cosmic Rays with Magnetic Spectrometers

A Data Driven Approach for the Measurement of 10Be/9Be in Cosmic Rays with Magnetic Spectrometers

Dark matter or correlated errors: Systematics of the AMS-02 antiproton excess

USINE, CRDB, and CLUMPY tools

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