Isotropy of Cosmic Rays beyond 10^{20} eV Favors Their Heavy Mass Composition.

We report an estimation of the injected mass composition of ultrahigh energy cosmic rays (UHECRs) at energies higher than 10 EeV. The composition is inferred from an energy-dependent sky distribution of UHECR events observed by the Telescope Array surface detector by comparing it to the Large Scale Structure of the local Universe. In the case of negligible extragalactic magnetic fields (EGMFs), the results are consistent with a relatively heavy injected composition at E∼10  EeV that becomes lighter up to E∼100  EeV, while the composition at E>100  EeV is very heavy.

A systematic review of rural community-based mental health interventions in the United States.

Background: Mental health impacts a person's quality of life and ability to engage in healthy behaviors. Rural communities in the United States have limited access to mental and behavioral health treatment.

Aim: To conduct a systematic review to identify existing rural community-based mental health interventions and identify commonalities and differences by extracting study attributes and intervention components.