Tue·Mar 15, 2016Tuesday·March 15, 2016

1. 01*

   Determination of a dineutron correlation in Borromean nuclei via a quasi-free knockout ($p,pn$) reaction?

   Yuma Kikuchi · Kazuyuki Ogata🇯🇵 · Yuki Kubota · Masaki Sasano · Tomohiro Uesaka

   To discuss the dineutron correlation in the ground state, the quasi-free neutron knockout reaction on ${}^6$He is investigated.In the present work, the momentum distribution of the two emitted neutrons is calculated with the $\alpha$~+~$n$~+~$n$ three-body model and a simple reaction model to assess the effects of the knockout process via the ${}^5$He resonance and the target dependence in the momentum distribution. A clear signature of the dineutron correlation can be obtained by choosing the kinematical condition so the process via the ${}^5$He resonance is excluded because the ${}^5$He resonance drastically changes the momentum distribution. Using the proton target is important in the quantitative discussion on the dineutron correlation by the knockout reaction. In addition to theoretical arguments, a possible experimental setup to determine the dineutron correlation via the quasi-free knockout reaction is considered.

   ↳ nucl-thnucl-exPTEP(2016)·19 citations
2. 02*

   The Cosmological Lithium Problem Revisited

   C.A. Bertulani🇺🇸 · A.M. Mukhamedzhanov · Shubhchintak🇺🇸

   After a brief review of the cosmological lithium problem, we report a few recent attempts to find theoretical solutions by our group at Texas A&M University (Commerce & College Station). We will discuss our studies on the theoretical description of electron screening, the possible existence of parallel universes of dark matter, and the use of non-extensive statistics during the Big Bang nucleosynthesis epoch. Last but not least, we discuss possible solutions within nuclear physics realm. The impact of recent measurements of relevant nuclear reaction cross sections for the Big Bang nucleosynthesis based on indirect methods is also assessed. Although our attempts may not able to explain the observed discrepancies between theory and observations, they suggest theoretical developments that can be useful also for stellar nucleosynthesis.

   ↳ astro-ph.COnucl-exnucl-thAIP Conf.Proc.(2016)·3 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.