Tue·Aug 18, 2015Tuesday·August 18, 2015

1. 01*

   Precision measurement of the mass difference between light nuclei and anti-nuclei

   ALICE collaboration

   The measurement of the mass differences for systems bound by the strong force has reached a very high precision with protons and anti-protons. The extension of such measurement from (anti-)baryons to (anti-)nuclei allows one to probe any difference in the interactions between nucleons and anti-nucleons encoded in the (anti-)nuclei masses. This force is a remnant of the underlying strong interaction among quarks and gluons and can be described by effective theories, but cannot yet be directly derived from quantum chromodynamics. Here we report a measurement of the difference between the ratios of the mass and charge of deuterons and anti-deuterons, and ${}^3\mathrm{He}$ and ${}^3\overline{\mathrm{He}}$ nuclei carried out with the ALICE (A Large Ion Collider Experiment) detector in Pb-Pb collisions at a centre-of-mass energy per nucleon pair of 2.76 TeV. Our direct measurement of the mass-over-charge differences confirm CPT invariance to an unprecedented precision in the sector of light nuclei. This fundamental symmetry of nature, which exchanges particles with anti-particles, implies that all physics laws are the same under the simultaneous reversal of charge(s) (charge conjugation C), reflection of spatial coordinates (parity transformation P) and time inversion (T).

   nucl-exhep-exNat.Phys.(2015)·81 citations
2. 02*

   Recent results on the nucleon resonance spectrum and structure from the CLAS detector

   Victor Mokeev🇺🇸 · Inna Aznauryan🇦🇲 · Volker Burkert🇺🇸 · Ralf Gothe🇺🇸

   The CLAS detector at Jefferson Lab has provided the dominant part of all available worldwide data on exclusive meson electroproduction off protons in the resonance region. New results on the ${\gamma }_{v}p{N}^{\ast }$ transition amplitudes (electrocouplings) are available from analyses of the CLAS data and will be presented. Their impact on understanding of hadron structure will be discussed emphasizing the credible access to the dressed quark mass function that has been achieved for the first time by a combined analysis of the experimental results on the electromagnetic nucleon elastic and $N\to N^{\ast }$ transition form factors. We will also discuss further convincing evidences for a new baryon state $N^{{}^{\prime }}(1720)3/2^{+}$ found in a combined analysis of charged double pion photo- and electroproduction cross sections off the protons.

   nucl-exhep-phEPJ Web Conf.(2016)·22 citations
3. 03*

   Electric dipole moments of superheavy elements - A case study on copernicium

   Laima Radžiūtė · Gediminas Gaigalas · Per Jönsson🇬🇧 · Jacek Bieroń🇵🇱

   The multiconfiguration Dirac-Hartree-Fock (MCDHF) method was employed to calculate atomic electric dipole moments (EDM) of the superheavy element copernicium (Cn, $Z=112$). The EDM enhancement factors of Cn, here calculated for the first time, are about one order of magnitude larger than those of Hg. The exponential dependence of enhancement factors on atomic number $Z$ along group 12 of the periodic table was derived from the EDMs of the entire homolog series, ${}_{30}^{69}$Zn, ${}_{48}^{111}$Cd, ${}_{80}^{199}$Hg, ${}_{112}^{285}$Cn, and ${}_{162}^{482}$Uhb. These results show that superheavy elements with sufficiently large half-lives are good candidates for EDM searches.

   ↳ physics.atom-phnucl-exnucl-thPRA(2016)·8 citations
4. 04*

   A prototype vector magnetic field monitoring system for a neutron electric dipole moment experiment

   N. Nouri🇺🇸 · A. Biswas🇮🇳 · M. A. Brown🇺🇸 · R. Carr🇺🇸 · B. Filippone🇺🇸 · C. Osthelder🇺🇸 · B. Plaster🇺🇸 · S. Slutsky🇺🇸 · C. Swank🇺🇸

   We present results from a first demonstration of a magnetic field monitoring system for a neutron electric dipole moment experiment. The system is designed to reconstruct the vector components of the magnetic field in the interior measurement region solely from exterior measurements.

   ↳ physics.ins-detnucl-exJINST(2015)·9 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.