Observation of T = 2 level in 20Ne as a compound nucleus resonance

Isobaric Analog States and Coulomb Displacement Energies in the (1d52) Shell

“…As was the case with the T=2 states in mass 24, the lowest analog states in 20 Ne and 20 F have been identified previously, 16,[23][24][25] so no angular distributions were obtained in this experiment. Figure 5 shows triton and Ne(i>, 3 He) 20 F taken at 0 Iab =36.2° for 9280 M C The target was a 50:50 mixture of neon and methane, the neon being 92.0% enriched in 22 Ne.…”

“…The T=2 states in 24 Mg and 24 Na have both been identified previously [15][16][17][18][19] and, in fact, the angular distribution of the (p, t) reaction to the state in 24 Mg has also been extensively studied. 20 Consequently, no attempt was made here to obtain angular distributions; both telescopes were set at 0i ab = 22.3°, this being near a maximum in the L==0 angular distribution as well as being an angle at which the analog states were resolved from nearby impurity levels.…”

“…A114, 1 (1968). 24 Na; l T==2 States Figure 2 shows triton and 3 He spectra observed from a 1.26-mg/cm 2 self-supporting magnesium foil enriched to 99.2% in 26 Mg; the data were taken at 0i ab =22.3° for 3200 JUC It is evident from the figure that a significant amount of carbon was present in the target, and the peaks corresponding to states in 10 C and 10 B provided the principal sources of calibration although all other peaks with (unbracketed) energies marked in the figure were also used.…”

“…Values for the excitation energies were obtained and the results are given in Table 1. [15][16][17][18][19][21][22][23][24][25] gi ve n in the table are weighted averages of all previous measurements, and a final overall average which also includes the present results.…”

“…Based on the predictions in Table VIII, the undiscovered nuclei 20 Mg and 24 Si are certainly stable, since their last proton is bound by more than 2.70 MeV. The nuclei 22 A1 and 23 A1 are predicted stable against proton emission by 0.15 and 0.16 MeV, respectively, while 19 Na is predicted unstable by 0.36 MeV.…”