Here we present the ELI Gamma Above Neutron Threshold setup recently implemented at the Extreme Light Infrastructure – Nuclear Physics. The main goals of the detector array are presented, as well as the mechanical design and the performance of the individual detectors. In addition, we have performed Geant4 simulations for realistic beam conditions. Finally, we show the performance of the array as a whole and outline the analysis procedure for complex experimental measurements by reproducing the angular correlations of neutrons following spontaneous fission of a 252Cf source. 

http://manuscript.elsevier.com/S0168900221010494/pdf/S0168900221010494.pdf

ELIGANT-GN — ELI Gamma Above Neutron Threshold: The Gamma-Neutron setup

Investigating the predicted breathing-mode excitation of the Hoyle state

This project aimed to investigate proton unbound states in 32Cl
using the 32S(3He; t) charge-exchange reaction. This research is
relevant both in the context of nuclear structure and astrophysics.
Excited states in 32Cl up to Ex 6 MeV were produced using a
50 MeV 3He++ beam from the K200 separated sector cyclotron
at iThemba LABS. The triton ejectiles were mass analysed and
detected at the focal plane of the K600 magnetic spectrometer.
An additional segmented silicon detector array called CAKE was
used to detect the unbound protons from states in 32Cl in conjunction
with the tritons. In this work we looked for potential
sources of isospin admixture that could explain the apparent violation
of the Isobaric Multiplet Mass Equation (IMME) for the
A = 32, T = 2 quintet. We also investigated the possibility of determining
the 31S(p; 
) reaction rate indirectly, via measurements
of the partial proton widths of unbound states in 32Cl.

Spectroscopy of proton unbound states in 32Cl

The Silicon Array for Branching Ratio Experiments (SABRE) has been developed for use to study reactions of interest to nuclear structure and astrophysics . The array has been incorporated into the Super Enge Split-Pole Spectrograph (SE-SPS) experimental setup at Florida State University’s John D. Fox accelerator laboratory to detect charged-particle decays in coincidence with reaction products detected by the SE-SPS focal plane detector. Its construction and electronics processing are discussed, as well as the commissioning data used to validate its performance.

SABRE: The Silicon Array for Branching Ratio Experiments

Knowledge of the low-lying monopole strength in $\mathrm{^{12}C}$, the Hoyle state in particular, is crucial for our understanding of both the astrophysically important $3\alpha$ reaction and of $\alpha$-particle clustering. The $\mathrm{^{12}C}(\alpha, \alpha^{\prime})\mathrm{^{12}C}$ and $\mathrm{^{14}C}(p, t)\mathrm{^{12}C}$ reactions were employed to populate states in $^{12}$C. A self-consistent, simultaneous analysis of the inclusive spectra with lineshapes was performed, which accounted for distortion due to nuclear dynamics and experimental effects. Clear evidence was found for excess monopole strength at $E_{x} \sim 9$ MeV, particularly in the $\mathrm{^{12}C}(\alpha, \alpha^{\prime})\mathrm{^{12}C}$ reaction at $0^{\circ}$. This additional strength cannot be reproduced by the previously established monopole states between $E_{x} = 7$ and 13 MeV. An additional $0^{+}$ state at $E_{x} \sim 9$ MeV yielded a significantly improved fit of the data and is the leading candidate for the predicted breathing-mode excitation of the Hoyle state. Alternatively, the results may suggest that a more sophisticated, physically motivated parameterization of the astrophysically important monopole strengths in $\mathrm{^{12}C}$ is required.

Multi-probe study of excited states in $\mathrm{^{12}C}$: disentangling the sources of monopole strength between the Hoyle state and $E_{x} = 13$ MeV

The combination of a magnetic spectrometer and ancillary detectors such as silicon detectors is a powerful tool for the study of nuclear reactions and nuclear structure This paper discusses the recently commissioned silicon array called the CAKE which is designed for use with the K600 magnetic spectrometer at iThemba LABS

CAKE: The Coincidence Array for K600 Experiments

The combination of a magnetic spectrometer and ancillary detectors such as silicon detectors is a powerful tool for the study of nuclear reactions and nuclear structure. This paper discusses the recently commissioned silicon array called the "CAKE" which is designed for use with the K600 magnetic spectrometer at iThemba LABS.

https://iopscience.iop.org/article/10.1088/1748-0221/12/02/T02004/pdf

CAKE: the coincidence array for K600 experiments

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CAKE: The Coincidence Array for K600 Experiments

CAKE: the coincidence array for K600 experiments