[Bubble] isotopic production cross sections relevant to astrophysics

[Jay Benesch]

Outline of a research program which could be executed indirectly in the 
UITF or LERF at JLab and elsewhere?  Or just FRIB and similar?  JLab 
wants to get into the ion source business for JLEIC; could this be the 
camals nose?  Probably not - energy/nucleon is too high.  But it's 
something that might be done with the injection complex at RHIC now or 
at JLEIC if built.


https://arxiv.org/abs/1803.04686

  Current status and desired accuracy of the isotopic production cross 
sections relevant to astrophysics of cosmic rays I. Li, Be, B, C, N
Yoann Genolini, David Maurin, Igor V. Moskalenko, Michael Unger
(Submitted on 13 Mar 2018)

     The accuracy of the current generation of cosmic-ray (CR) 
experiments, such as AMS-02, PAMELA, CALET, and ISS-CREAM, is now 
reaching ∼1--3\% in a wide range in energy per nucleon from GeV/n to 
multi-TeV/n. Their correct interpretation could potentially lead to 
discoveries of new physics and subtle effects that were unthinkable just 
a decade ago. However, a major obstacle in doing so is the current 
uncertainty in the isotopic production cross sections that can be as 
high as 20--50\% or even larger in some cases. While there is a recently 
reached consensus in the astrophysics community that new measurements of 
cross sections are desirable, no attempt to evaluate the importance of 
particular reaction channels and their required accuracy has been made 
yet. It is, however, clear that it is a huge work that requires an 
incremental approach. The goal of this study is to provide the ranking 
of the isotopic cross sections contributing to the production of the 
most astrophysically important CR Li, Be, B, C, and N species. In this 
paper, we (i) rank the reaction channels by their importance for a 
production of a particular isotope, (ii) provide comparisons plots 
between the models and data used, and (iii) evaluate a generic beam time 
necessary to reach a 3\% precision in the production cross-sections 
pertinent to the AMS-02 experiment. This first roadmap may become a 
starting point in the planning of new measurement campaigns that could 
be carried out in several nuclear and/or particle physics facilities 
around the world. A comprehensive evaluation of other isotopes Z≤30 will 
be a subject of follow-up studies.

Comments: 	37 pages, many figures and tables. Comments are welcome