Measurement of 25Mg(p; gamma)26Al resonance strengths via gamma spectrometry

TL;DR

This study measures resonance strengths of the 25Mg(p; gamma)26Al reaction at various energies using gamma spectrometry, providing data crucial for understanding galactic 26Al production.

Contribution

It presents new resonance strength measurements at multiple energies, including underground measurements, improving reaction rate accuracy for astrophysical models.

Findings

Resonance strengths at 745, 418, 374, 304 keV measured.

First underground measurement at 189 keV resonance.

Results will refine models of 26Al production in the galaxy.

Abstract

The COMPTEL instrument performed the first mapping of the 1.809 MeV photons in the Galaxy, triggering considerable interest in determing the sources of interstellar 26Al. The predicted 26Al is too low compared to the observation, for a better understanding more accurate rates for the 25Mg(p; gamma)26Al reaction are required. The 25Mg(p;gamma)26Al reaction has been investigated at the resonances at Er= 745; 418; 374; 304 keV at Ruhr-Universitat-Bochum using a Tandem accelerator and a 4piNaI detector. In addition the resonance at Er = 189 keV has been measured deep underground laboratory at Laboratori Nazionali del Gran Sasso, exploiting the strong suppression of cosmic background. This low resonance has been studied with the 400 kV LUNA accelerator and a HPGe detector. The preliminary results of the resonance strengths will be reported.