Ingo Wiedenhöver, Florida State University
Argonne Physics Division Seminar - 3 Dec 2012

Rare Ion Beam experiments with ANASEN at the RESOLUT facility

The RESOLUT facility at Florida State University's accelerator laboratory produces beams of short-lived nuclei using the in-flight method. Beams such as He-6, Be-7, Li-8, B-8, O-19 and Al-25 have been successfully used in experiments. Recently, the program has focused on experiments with the new ANASEN detector system, which was commissioned in 2011 and 2012 during a series of experiments. ANASEN is an active-target detector system developed for resonant scattering and transfer reactions, including alpha-resonant scattering, proton-resonant scattering, (α,p) and (d,p) reactions. In particular, ANASEN was used in two experiments studying the energetic location of the d3/2-orbital in neutron-rich nuclei, which is of interest as it determines the location of the neutron drip-line in the Oxygen isotopes. Its unexpected behavior has recently been explained as a consequence of three-body forces [1]. I will present the methods used and the first results of these experiments regarding the spectrum of unbound d3/2 resonances in O-20.

The ANASEN project is a collaboration between Florida State University and Louisiana State University. It is funded by an NSF Major Research Instrumentation grant.

[1] T. Otsuka et al., Phys. Rev. Lett 105, 032501 (2010)

Argonne Physics Division Seminar Schedule