Isomer beam elastic scattering: 26mAl(p, p) for astrophysics

D. Kahl, H. Shimizu, H. Yamaguchi, K. Abe, O. Beliuskina, S. M. Cha, K. Y. Chae, A. A. Chen, Z. Ge, S. Hayakawa, N. Imai, N. Iwasa (+19 others)
2017 EPJ Web of Conferences  
The advent of radioactive ground-state beams some three decades ago ultimately sparked a revolution in our understanding of nuclear physics. However, studies with radioactive isomer beams are sparse and have often required sophisticated apparatuses coupled with the technologies of ground-state beams due to typical mass differences on the order of hundreds of keV and vastly different lifetimes for isomers. We present an application of a isomeric beam of 26m Al to one of the most famous
more » ... st famous observables in nuclear astrophysics: galactic 26 Al. The characteristic decay of 26 Al in the Galaxy was the first such specific radioactivity to be observed originating from outside the Earth some four decades ago. We present a newly-developed, novel technique to probe the structure of low-spin states in 27 Si. Using the Center for Nuclear Study low-energy radioisotope beam separator (CRIB), we report on the measurement of 26m Al proton resonant elastic scattering conducted with a thick target in inverse kinematics. The preliminary results of this on-going study are presented. Motivation The observation of 1.809-MeV γ-rays associated with the decay of 26 Al across the Milky Way has attracted much attention in various subfields of nuclear astrophysics in the years since its discovery [1] . Observations point to massive stars as the main producers of the observed 26 Al [2], although it is unclear whether its production occurs mainly in the Wolf-Rayet phase or during subsequent supernova. The ground state of 26 Al, which we denote 26g Al, has a spin-parity J π = 5 + , a halflife of 0.72 Myr, and decays predominately through the first excited state in 26 Mg located at 1.809 MeV,
doi:10.1051/epjconf/201716501030 fatcat:ghytjnq7o5gytpu4djqilwyxcq