J. A. Swartz

Characterization of the proposed 4-α cluster state candidate in O 16

CITATION: Li, K. C. W., et al. 2017. Characterization of the proposed 4−α cluster state candidate in ¹⁶O. Physical Review C, 95(3):1-6, doi:10.1103/PhysRevC.95.031302.

Wavelet signatures of K -splitting of the Isoscalar Giant Quadrupole Resonance in deformed nuclei from high-resolution (p,p ′ ) scattering off 146, 148, 150 Nd

Abstract The phenomenon of fine structure of the Isoscalar Giant Quadrupole Resonance (ISGQR) has been studied with high energy-resolution proton inelastic scattering at iThemba LABS in the chain of stable even-mass Nd isotopes covering the transition from spherical to deformed ground states. A wavelet analysis of the background-subtracted spectra in the deformed 146, 148, 150 Nd isotopes reveals characteristic scales in correspondence with scales obtained from a Skyrme RPA calculation using the SVmas10 parameterization. A semblance analysis shows that these scales arise from the energy shift between the main fragments of the K = 0 , 1 and K = 2 components.

Search for highly excited states in 28Si

CITATION: Montanari, D., et al. 2017. Search for highly excited states in ²⁸Si. Journal of Physics: Conference Series, 863(1):012051, doi:10.1088/1742-6596/863/1/012051.

A high energy-resolution zero degree facility for (p,p′) and (p,t) reactions

Medium-energy hadronic scattering and reactions at zero degrees are very selective to excitations with low angular momentum transfer. Only a few facilities exist worldwide where high energy-resolution measurements of this nature can be performed. The K600 Zero-Degree Facility at iThemba LABS, South Africa, was recently successfully developed. Measurements were performed for inelastic proton scattering at an incident energy of 200 MeV for targets ranging from 27Al to 208Pb. Excitation energy-resolution of 50 keV (FWHM) was achieved. A reasonable background subtraction procedure allows for the extraction of excitation energy spectra with low background. Measurements of the (p,t) reaction at 100 MeV benefit from a large difference in magnetic rigidity between the reaction products and primary particles, resulting in almost background-free spectra with excitation energy-resolution of 32 keV (FWHM).

2{sup +} excitation of the {sup 12}C Hoyle state

A high-energy-resolution magnetic spectrometer has been used to measure the 12 C excitation energy spectrum to search for the 2 + excitation of the 7.65 MeV, 0 + Hoyle state. By measuring in the diffractive minimum of the angular distribution for the broad 0 + background, evidence is found for a possible 2 + state at 9.6(1) MeV with a width of 600(100) keV. The implications for the 8 Be + 4 He reaction rate in stellar environments are discussed.

Cluster Structure of 12Cand 11Be

The structure of 12C is discussed, in particular the spectrum of states above the α‐decay threshold. A search for the 2+ excitation of the Hoyle‐state is reported. The structural link between halo‐like states and molecular states is explored in the case of 11Be.

Cluster Structure of {sup 12}C and {sup 11}Be

The structure of 12C is discussed, in particular the spectrum of states above the α‐decay threshold. A search for the 2+ excitation of the Hoyle‐state is reported. The structural link between halo‐like states and molecular states is explored in the case of 11Be.

Cluster Structure of 12C and 11Be

The structure of 12C is discussed, in particular the spectrum of states above the α‐decay threshold. A search for the 2+ excitation of the Hoyle‐state is reported. The structural link between halo‐like states and molecular states is explored in the case of 11Be.