Speaker
Description
Experiment was done by our group on $^{12}$C($^{3}$He,t)$^{12}$N reaction. The measurements were conducted at the University of Jyväskylä (Finland) using the K130 cyclotron to produce a $^{3}$He beam at E($^{3}$He)=40 MeV. The 150 cm diameter Large Scattering Chamber was equipped with three ΔE-E detector telescopes, each containing two independent ΔE detectors and one common E detector. So each device allowed carrying out measurements at two angles. The differential cross sections of the ($^{3}$He,t) reaction on $^{12}$C were measured in the c.m. angular range 8°–70°. Self-supported $^{12}$C foils of 0.23 and 0.5 mg/cm$^{2}$ thicknesses were used as targets. It should be mentioned that, before starting measurements, beam monochromatization was done [1], which made it possible to diminish beam energy spreading up to three times and obtain a total energy resolution about 140 keV. Triton angular distributions for the g.s. and three first excited states of $^{12}$N: 0.96-MeV 2$^{+}$, 1.19-MeV 2$^{−}$, and 1.80-MeV 1$^{−}$ were measured. Modified Diffraction Model (MDM) analysis [2] of ($^{3}$He,t) experimental data was done. Enhanced rms radii were obtained for the 2$^{−}$ (1.19-MeV) and 1$^{−}$ (1.80-MeV) states of $^{12}$N. It can be an argument for existence of halo in these states.
- W.H. Trzaska et al. Nucl. Instrum. Methods Phys. Res. A 903, 241
(2018). - A.S. Demyanova et al., Physics of Atomic Nuclei 80, 831
(2017).
