Two-electron one-photon transitions in Li-like ions

Natarajan, L.

doi:10.1103/physreva.88.052522

Cited by 13 publications

(14 citation statements)

References 33 publications

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“…In the cases with significant diffusion considered in Refs. [32,33], the current work improves WIMP constraints by about one order of magnitude. The actual ratio might be actually slightly larger since in our modeling the magnetic field (diffusion coefficient) decreases (increases) exponentially outside the stellar region while in [32,33] they are taken to be constant.…”

Section: Comparison With Previous Workmentioning

confidence: 86%

“…A very recent campaign using instead the GBT single-dish radio telescope was presented in [32,33], and similar studies can be conducted with the Effelsberg 100-m single-dish telescope which has the capability of also detecting extremely weak polarised emission.…”

Section: Discussionmentioning

confidence: 97%

“…The analysis most directly comparable to ours has been recently presented in Refs. [32,33]. It is based on radio observations of the Ursa Major II and Willman 1 FoVs at 1.4 GHz with the GBT telescope.…”

Section: Comparison With Previous Workmentioning

confidence: 99%

“…Radio observations of dSph galaxies have been also very recently attempted through the Green Bank Telescope (GBT) [32,33], aiming to test the prediction of [4]. The FoVs of Draco, Ursa Major II, Coma Berenices, and Willman I were mapped at 1.4 GHz with a resolution of 10 arcmin and a sensitivity of 7 mJy/beam (after discrete source subtraction).…”

Section: Introductionmentioning

confidence: 99%

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Local Group dSph radio survey with ATCA (III): constraints on particle dark matter

Regis¹,

Colafrancesco²,

Profumo³

et al. 2014

J. Cosmol. Astropart. Phys.

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We performed a deep search for radio synchrotron emissions induced by weakly interacting massive particles (WIMPs) annihilation or decay in six dwarf spheroidal (dSph) galaxies of the Local Group. Observations were conducted with the Australia Telescope Compact Array (ATCA) at 16 cm wavelength, with an rms sensitivity better than 0.05 mJy/beam in each field. In this work, we first discuss the uncertainties associated with the modeling of the expected signal, such as the shape of the dark matter (DM) profile and the dSph magnetic properties. We then investigate the possibility that point-sources detected in the proximity of the dSph optical center might be due to the emission from a DM cuspy profile. No evidence for an extended emission over a size of few arcmin (which is the DM halo size) has been detected. We present the associated bounds on the WIMP parameter space for different annihilation/decay final states and for different astrophysical assumptions. If the confinement of electrons and positrons in the dSph is such that the majority of their power is radiated within the dSph region, we obtain constraints on the WIMP annihilation rate which are well below the thermal value for masses up to few TeV. On the other hand, for conservative assumptions on the dSph magnetic properties, the bounds can be dramatically relaxed. We show however that, within the next 10 years and regardless of the astrophysical assumptions, it will be possible to progressively close in on the full parameter space of WIMPs by searching for radio signals in dSphs with SKA and its precursors.

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Section: Comparison With Previous Workmentioning

confidence: 86%

Section: Discussionmentioning

confidence: 97%

Section: Comparison With Previous Workmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Local Group dSph radio survey with ATCA (III): constraints on particle dark matter

Regis¹,

Colafrancesco²,

Profumo³

et al. 2014

J. Cosmol. Astropart. Phys.

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“…The TEOP process was first predicted theoretically by Heisenberg in 1925 [21] and was observed by Wölfli et al in ion-atom collision experiments between Ni-Ni, Ni-Fe, Fe-Ni and Fe-Fe in 1975 [22]. Since then, TEOP transitions have been widely studied both theoretically and experimentally [23][24][25][26][27][28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Effects of electron correlation and the Breit interaction on one- and two-electron one-photon transitions in double K hole states of He-like ions (10 ≤ Z ≤ 47)*

Ding

Cao

et al. 2020

Chinese Phys. B

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The x-ray energies and transition rates associated with single and double electron radiative transitions from the double K hole state 2s2p to the 1s2s and 1s 2 configurations of 11 He-like ions (10 ≤ Z ≤ 47) are evaluated using the fully relativistic multi-configuration Dirac-Fock method. An appropriate electron correlation model is constructed with the aid of the active space method, which allows the electron correlation effects to be studied efficiently. The contributions of electron correlation and the Breit interaction to the transition properties are analyzed in detail. It is found that the two-electron one-photon (TEOP) transition is correlation sensitive. The Breit interaction and electron correlation both contribute significantly to the radiative transition properties of the double K hole state of He-like ions. Good agreement between the present calculation and previous work is achieved. The calculated data will be helpful to future investigations on double K hole decay processes of He-like ions.

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Relativistic atomic structure calculations and electron impact excitations of Fe23+

El-Maaref

2016

Journal of Quantitative Spectroscopy and Radiative Transfer

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Two-electron one-photon transitions in Li-like ions

Cited by 13 publications

References 33 publications

Local Group dSph radio survey with ATCA (III): constraints on particle dark matter

Local Group dSph radio survey with ATCA (III): constraints on particle dark matter

Effects of electron correlation and the Breit interaction on one- and two-electron one-photon transitions in double K hole states of He-like ions (10 ≤ Z ≤ 47)*

Relativistic atomic structure calculations and electron impact excitations of Fe23+

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