Thu·Jan 9, 2020Thursday·January 9, 2020

1. 01*

   Systematics of direct-$\alpha$ production with weakly and strongly bound projectiles

   V. V. Parkar🇮🇳 · V. Jha🇮🇳 · S. Kailas🇮🇳

   The production of $\alpha$-particles in reactions using both the strongly and weakly bound projectiles at energies around the Coulomb barrier show several interesting features. To understand these, the role of various reaction mechanisms responsible for $\alpha$-production, such as non-capture breakup, capture of only one of the fragments subsequent to projectile breakup and their contribution to reaction cross sections have been investigated. A systematic study of the $\alpha$-particle production based on available data for various projectile target systems have been performed and a classification based on projectile type is obtained.

   nucl-exnucl-th2 citations
2. 02*

   Search for beta-delayed proton emission from ${}^{11}$Be

   K. Riisager🇩🇰 · M.J.G. Borge🇨🇭 · J.A. Briz🇪🇸 · M. Carmona-Gallardo🇪🇸 · O. Forstner🇦🇹 · L.M. Fraile🇪🇸 · H.O.U. Fynbo🇩🇰 · A. Garzon Camacho🇪🇸 · J.G. Johansen🇩🇰 · B. Jonson🇸🇪 · M.V. Lund🇩🇰 · J. Lachner🇦🇹 and 7 other authors

   We report on an attempt to reproduce the observation of ${\beta }^{-}$-delayed proton emission from ${}^{11}$Be through detection of the final state nucleus ${}^{10}$Be with accelerator mass spectrometry. Twelve samples were collected at the ISOLDE facility at CERN at different separator settings, allowing tests of different sources of contamination to be carried out. The observed amounts of ${}^{10}$Be per collected ${}^{11}$Be rule out several contamination sources, but do not agree internally. Formation of BeH molecular ions in the ion source may explain our data, in which case an upper limit of the $\beta$p branching ratio of $2.2\cdot 10^{-6}$ can be derived.

   nucl-exEPJA(2020)·24 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.