15 research outputs found
Measurement of the full excitation spectrum of the 7Li(p,{\gamma}){\alpha}{\alpha} reaction at 441 keV
A current challenge for ab initio calculations is systems that contain large
continuum contributions such as 8Be. We report on new measurements of radiative
decay widths in this nucleus that test recent Green's function Monte Carlo
calculations.
Traditionally, {\gamma} ray detectors have been utilized to measure the high
energy photons from the 7Li(p, {\gamma}){\alpha}{\alpha} reaction. However, due
to the complicated response function of these detectors it has not yet been
possible to extract the full {\gamma} ray spectrum from this reaction. Here we
present an alternative measurement using large area Silicon detectors to detect
the two {\alpha} particles, which provides a practically background free
spectrum and retains good energy resolution.
The resulting spectrum is analyzed using a many-level multi channel R-matrix
parametrization. Improved values for the radiative widths are extracted from
the R-matrix fit. We find evidence for significant non-resonant continuum
contributions and tentative evidence for a broad 0+ resonance at 12 MeV.Comment: Accepted version. Fixed Fig. 5 ordinate label
Forskere og ingeniør:Potentialet for atomkraft i Danmark skal have en mere helstøbt og åben vurdering
Der er behov for en grundig vurdering af mulighederne for atomkraft i Danmark, hvor reelt forskellige scenarier tages i betragtning, og hvor både forsyningssikkerhed, prisstabilitet og miljøhensyn indgår i overvejelserne, mener tre forskere og en civilingeniør
Resolving the
Although the reaction has been widely studied for its relevance in material science, nuclear structure, nuclear astrophysics, and fusion science, significant discrepancies exist in the data. For the channel proceeding via the ground state of , the available cross-section data shows large discrepancies of both normalization and energy scale. The present paper reports on a measurement of the cross-section using an array of large area segmented silicon detectors and low beam current on an enriched thin target with the aim of resolving the discrepancies amongst previous measurements