Mon·Aug 10, 2020Monday·August 10, 2020

1. 01*

   Decay Spectroscopy of ${}^{129}$Cd

   Y. Saito🇨🇦 · I. Dillmann🇨🇦 · R. Krücken🇨🇦 · N. Bernier🇨🇦 · G. C. Ball🇨🇦 · M. Bowry🇨🇦 · C. Andreoiu🇨🇦 · H. Bidaman🇨🇦 · V. Bildstein🇨🇦 · P. Boubel🇨🇦 · C. Burbadge🇨🇦 · R. Caballero-Folch🇨🇦 and 33 other authors

   Excited states of ${}^{129}$In populated following the $\beta$-decay of ${}^{129}$Cd were experimentally studied with the GRIFFIN spectrometer at the ISAC facility of TRIUMF, Canada. A 480-MeV proton beam was impinged on a uranium carbide target and ${}^{129}$Cd was extracted using the Ion Guide Laser Ion Source (IG-LIS). $\beta$- and $\gamma$-rays following the decay of ${}^{129}$Cd were detected with the GRIFFIN spectrometer comprising the plastic scintillator SCEPTAR and 16 high-purity germanium (HPGe) clover-type detectors. %, along with the $\beta$-particles were detected with SCEPTAR. From the $\beta$-$\gamma$-$\gamma$ coincidence analysis, 32 new transitions and 7 new excited states were established, expanding the previously known level scheme of ${}^{129}$In. The $\log ft$ values deduced from the $\beta$-feeding intensities suggest that some of the high-lying states were populated by the $\nu 0g_{7/2}\to \pi 0g_{9/2}$ allowed Gamow-Teller (GT) transition, which indicates that the allowed GT transition is more dominant in the ${}^{129}$Cd decay than previously reported. Observation of fragmented Gamow-Teller strengths is consistent with theoretical calculations.

   nucl-exnucl-thPRC(2020)·3 citations
2. 02*

   Factorized approach to radiative corrections for inelastic lepton-hadron collisions

   Tianbo Liu🇺🇸 · W. Melnitchouk🇺🇸 · Jian-Wei Qiu🇺🇸 · N. Sato🇺🇸

   We propose a factorized approach to QED radiative corrections for inclusive and semi-inclusive deep-inelastic scattering to systematically account for QED and QCD radiation contributions to both processes on equal footing. This is achieved by utilizing factorization to resum logarithmically enhanced QED radiation into universal lepton distribution and fragmentation (or jet) functions. Numerical simulations suggest that the QED effects induced by the rotational distortion of the hadron transverse momentum, arising from the mismatch between the experimental Breit frame and the true photon-hadron frame, can be as large as 50\% for moderate $Q$, and become increasingly important for large transverse momenta. Our framework provides a uniform treatment of radiative effects for extracting three-dimensional hadron structure from high-energy lepton-hadron scattering at current and future facilities, such as the Electron-Ion Collider.

   ↳ hep-phhep-exnucl-exnucl-thPRD(2021)·39 citations
3. 03*

   The emission of electromagnetic radiation from the early stages of relativistic heavy-ion collisions

   Jessica Churchill🇨🇦 · Li Yan🇨🇳 · Sangyong Jeon🇨🇦 · Charles Gale🇨🇦

   We estimate the production of electromagnetic radiation (real and virtual photons) from the early, pre-equilibrium, stage of relativistic heavy-ion collisions. The parton dynamics are obtained as a solution of the Boltzmann equation in the Fokker-Planck diffusion limit. The photon and dilepton rates are integrated and the obtained yields are compared with those from standard sources and with available experimental data. Non-equilibrium photon spectra are predicted for Pb+Pb at $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV.

   ↳ hep-phnucl-exnucl-thPRC(2021)·37 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.