Wed·Apr 8, 2020Wednesday·April 8, 2020

1. 01*

   Study of nuclear properties with muonic atoms

   A. Knecht🇨🇭 · A. Skawran🇨🇭 · S. M. Vogiatzi🇨🇭

   Muons are a fascinating probe to study nuclear properties. Muonic atoms can easily be formed by stopping negative muons inside a material. The muon is subsequently captured by the nucleus and, due to its much higher mass compared to the electron, orbits the nucleus at very small distances. During this atomic capture process the muon emits characteristic X-rays during its cascade down to the ground state. The energies of these X-rays reveal the muonic energy level scheme, from which properties like the nuclear charge radius or its quadrupole moment can be extracted. While almost all stable elements have been examined using muons, probing highly radioactive atoms has so far not been possible. The muX experiment has developed a technique based on transfer reaction inside a high pressure hydrogen/deuterium gas cell to examine targets available only in microgram quantities.

   nucl-exEur.Phys.J.Plus(2020)·37 citations
2. 02*

   Model Independent Extraction of the Proton Charge Radius from PRad data

   Gil Paz🇺🇸

   The proton radius puzzle has motivated several new experiments that aim to extract the proton charge radius and resolve the puzzle. Recently PRad, a new electron-proton scattering experiment at Jefferson Lab, reported a proton charge radius of $0.831\pm 0.007_{\text{statistical}}\pm 0.012_{\text{systematic}}$. The value was obtained by using a rational function model for the proton electric form factor. We perform a model-independent extraction using $z$-expansion of the proton charge radius from PRad data. We find that the model-independent statistical error is more than 50\% larger compared to the statistical error reported by PRad.

   ↳ hep-phhep-exnucl-exnucl-thMod.Phys.Lett.A(2021)·7 citations

* Reconstructed cohort: no mailing for this day survives in the archive. Papers are grouped by their submission times and arXiv's announcement cut-off, assuming announcement without delay; positions follow identifier order. Validated at ~91% exact-day agreement against the archived era.