Mon·Feb 12, 2018Monday·February 12, 2018

1. 01*

   An experimental survey of the production of alpha decaying heavy elements in the reactions of ${}^{238}$U +${}^{232}$Th at 7.5-6.1 MeV/nucleon

   S. Wuenschel🇺🇸 · K. Hagel · M. Barbui🇺🇸 · J. Gauthier🇺🇸 · X. G. Cao🇨🇳 · R. Wada🇺🇸 · E. J. Kim · Z. Majka🇵🇱 · R. Płaneta🇵🇱 · Z. Sosin🇵🇱 · A. Wieloch🇵🇱 · K. Zelga and 5 other authors

   The production of alpha particle decaying heavy nuclei in reactions of 7.5-6.1 MeV/nucleon ${}^{238}$U +${}^{232}$Th has been explored using an in-beam detection array composed of YAP scintillators and gas ionization chamber-Si telescopes. Comparisons of alpha energies and half-lives for the observed products with those of the previously known isotopes and with theoretically predicted values indicate the observation of a number of previously unreported alpha emitters. Alpha particle decay energies reaching as high as 12 MeV are observed. Many of these are expected to be from decay of previously unseen relatively neutron rich products. While the contributions of isomeric states require further exploration and specific isotope identifications need to be made, the production of heavy isotopes with quite high atomic numbers is suggested by the data.

   nucl-exPRC(2018)·40 citations
2. 02*

   Statistical approach of pion parton distributions from Drell-Yan process

   Claude Bourrely🇫🇷 · Jacques Soffer🇺🇸

   The quantum statistical approach proposed more than one decade ago was used to determine the parton distributions for the proton by considering a large set of accurate Deep Inelastic Scattering experimental results. We propose to extend this work to extract the parton distributions for the pion by using data on lepton pair production from various experiments. This global next-to-leading order QCD analysis leads to a good description of several Drell-Yan ${\pi }^{-}W$ data. The resulting parton distributions are compared with earlier determinations. We will also discuss the difference between nucleon and pion structure in the same approach.

   ↳ hep-phnucl-exNPA(2019)·18 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.