One-crystal NaI spectrometer

Evidence for a Giant Quadrupole Resonance inO16

“…It is to be distinguished from the isoscalar E2 radiation reported in (/>, p') experiments 3 at energies a few MeV below the GDR of nuclei and also from the lower lying isoscalar El radiation observed in (a,y) reactions on even-even nuclei. 4 The experimental procedure consisted in measuring the reaction yields v u (6) and a d (0), corresponding to the spin of the incident protons being "up" and "down" relative to the reaction plane. The polarized proton beam was obtained from an atomic-beam source 5 and the Stanford FN tandem accelerator.…”

Giant Resonances

“…The 15N target consisted of 15N gas (> 90 %) at 200 torr in a gas cell 5 cm long. The y rays from the reaction were detected with the Stanford 24 x 24 cm NaI spectrometer (Suffert et al 1968). To minimize the background, the cell was equipped with an exit window in addition to the entrance window.…”

Evidence for an Anomaly in the Excitation Function of the ReactionH2(p,γ)3Chang1, Diener2, Ventura3 1972Phys. Rev. Lett.21010View full textAdd to dashboardCite

“…Details of this y-ray spectrometer have been described elsewhere. 9 Excitation curves were taken with the spectrometer fixed at 90° in the laboratory system. Because of the low cross section (peak cross section -1 /ib/sr) and low Q value (+5.495 MeV) of the reaction 2 H(£,y) 3 He, it was necessary to reduce the background y rays resulting from neutron capture in the Nal crystal itself and in the surrounding material.…”