28 May 2017 to 2 June 2017
US/Mountain timezone

Direct Measurements of α-capture Cross Sections Relevant for Nuclear Astrophysics

29 May 2017, 11:50
25m
Plenary-Longs Peak

Plenary-Longs Peak

Invited Presentation

Speaker

Melina Avila (Argonne National Laboratory)

Description

Since helium is the second most abundant element in the universe, there are numerous reaction rates involving α-particles that play a key role in nuclear astrophysics. For instance, some (α,p) reactions have been found to be fundamental for the understanding of X-ray bursts and the production of 44Ti in core-collapse supernovae. Furthermore, some (α,n) reactions are considered to be important neutron sources in different astrophysical scenarios. Direct measurements of these reactions at relevant astrophysical energies are experimentally challenging because of their small cross sections and the intensity limitation of radioactive beams. In this talk I will describe a novel technique to study (α,p) and (α,n) reactions using a Multi-Sampling Ionization Chamber (MUSIC), a simple and highly efficient active target system with a segmented anode that allows the investigation of a large energy range of the excitation function. Recent results on the direct measurement of (α,n) and (α,p) reactions in the MUSIC detector will be presented. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under contract number DE-AC02-06CH11357. This research used resources of ANL’s ATLAS facility, which is a DOE Office of Science User Facility.

Primary author

Melina Avila (Argonne National Laboratory)

Presentation materials

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