Electric moments of the first excited state of 18O

Electric Quadrupole Excitation of the First Excited State of 11B

“…2 as a function of bombarding energy E and of the distance s of closest approach between the nuclear surfaces. The quantity s is defined in equation (2) of Fewell et al (1979). The apparent decrease in Pexp/P c at the higher energies in Fig.…”

“…2 may be due to the onset of nuclear interference effects; e.g. in the case of projectile excitation of 18 0 by backscattering from 208Pb, Coulombnuclear interference has depressed the excitation probability by about 15 % at s = 5·4 fm (Fewell et al 1979). Therefore, to be conservative, the E2 transition probability is inferred from the two lowest energy data points only.…”

Static Quadrupole Moment of the First Excited State of 28Si

“…Principles of the experimental procedure, which used the reorientation effect in Coulomb excitation of 28Si projectiles, have been described in previous publications (Fewell et al 1979a(Fewell et al , 1979b. In order to determine both Q2+ and B(E2;0+ ~2+), two independent measurements of the excitation probability Pexp of the 2+ state are required.…”

“…An annular silicon surface barrier detector was mounted at a distance of 51 mm from the target,corresponding to a mean laboratory scattering angle of 172· 7°. Detectors were also placed on either side of the target to detect ions scattered through 90°, the mean scattering angle being known to ±O· 3°, corresponding to an uncertainty of ± 0·6 % in the determination of P expo The precautions described by Fewell et al (1979aFewell et al ( , 1979b were taken in order to minimize the effects of uncertainties in the trajectory of the incident beam and in the collinearity of the beam spot and the defining slits of the 90° detectors.…”

“…Christy and Hausser (1972) comment that the bombarding energies used by Pelte et al (1969) and Hausser et al (1969) were both too high to safely exclude nuclear interference. Some of the data used by Nakai et al (1970) correspond to a distance s of closest approach between the nuclear surfaces of 4·7 fm (the values of s quoted in the present paper are derived from equation (2) of Fewell et al (1979a), assuming a nuclear radius of 1 . 25 At fm).…”