2024-09-12 アルゴンヌ国立研究所(ANL)
＜関連情報＞
- https://www.anl.gov/article/unraveling-the-mystery-surrounding-the-creation-of-heavy-elements-in-stars
- https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.132.202701
天体物理的過程の条件を制約するための139Ba(,)140Ba 反応の最初の研究 First Study of the 139Ba(,)140Ba Reaction to Constrain the Conditions for the Astrophysical Process
A. Spyrou et al.
Physical Review Letters Published 17 May 2024
DOI:https://doi.org/10.1103/PhysRevLett.132.202701
Abstract
New astronomical observations point to a nucleosynthesis picture that goes beyond what was accepted until recently. The intermediate “” process was proposed as a plausible scenario to explain some of the unusual abundance patterns observed in metal-poor stars. The most important nuclear physics properties entering -process calculations are the neutron-capture cross sections and they are almost exclusively not known experimentally. Here we provide the first experimental constraints on the 139Ba(,)140Ba reaction rate, which is the dominant source of uncertainty for the production of lanthanum, a key indicator of -process conditions. This is an important step towards identifying the exact astrophysical site of stars carrying the -process signature.
