J. Hinnefeld

Search for

A search for the neutron-unbound nucleus

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C and constraints on

C was performed via the single proton removal reaction from a beam of 22 N at 68 MeV/u. Neutrons were detected with the Modular Neutron Array (MoNA) in coincidence with

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C

C fragments. No evidence for a low-lying state was found, and the reconstructed

Low-energy radioactive ion beam induced nuclear reactions

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Investigation of (α, p) reactions using a radioactive beam

C+n decay energy spectrum could be described with an s-wave line shape with a scattering length limit of |as| < 2.8 fm, consistent with shell model predictions. A comparison with a renormalized zero-range three-body model suggests that

The 15O(α,γ)19Ne∗ reaction using a 18Ne radioactive beam

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First observation of the13Li ground state

C is bound by less than 70 keV.

First observation of the 13 Li ground state

Low-energy post-accelerated radioactive ion beams have been used to study nuclear reactions addressing important nuclear structure and nuclear astrophysics questions. A high-granularity, large-solid-angle silicon strip detector array has been used to account for the low reaction products yields. First experiments using a He-6 beam on thin C-12 targets show the feasibility of direct reaction studies with good angular resolution and a detection limit in access of 0.1 mb sr(-1) cross sections. The measurement of the six alpha-decay channel in a N-13-induced reaction on a B-11 target shows the capabilities of this experimental technique even for sophisticated reaction studies. The study of stellar properties in ground-based experiments, in particular break-out reactions from the hot-CNO, i.e. O-15(alpha, gamma) Ne-19, can be pursued using these beams. Experiments are being performed to study these reactions by measurement of d(Ne-18, p) Ne-19*(alpha)O-15 and alpha(Ne-18, p), which might provide an alternative breakout route.