Reorientation Effect Measurements Research Articles

Reorientation effect measurements and multiple coulomb excitation in102Ru

The quadrupole moment of the first 2+ state in102Ru and fourB(E2) values have been measured by means of Coulomb excitation. The results are:Q2+=−0.68(8)eb;B(E2, 01/+→21/+)=0.617(5)e2b2;B(E2, 01+→22/+)=0.013 (2)e2b2;B(E2, 21/+→22/+)= 0.07(1)e2b2;B(E2, 21+→41+)=0.30(6)e2b2. The results are discussed within the frame of the Interacting Boson Approximation.

Reorientation effect measurements of even mercury isotopes

Reorientation effect and multiple Coulomb excitation measurements have been performed for198, 200, 202, 1204Hg. By measuring particle spectra after Coulomb excitation of an enriched198Hg target with4He and16O beams, a positive quadrupole moment of Q2 = 0.66±0.18 eb (for negative interference) or Q2=0.80±0.18 eb (for positive interference) andB(E2,0→2)=0.991±0.006 e2b2 were obtained. All otherB(E2) values and quadrupole moments were determined relative to these numbers from preciseγ-ray yields obtained from Coulomb excitation of a frozennatHg target with4He and16O projectiles. Oblate shapes of all Hg isotopes were found. The data have been interpreted in terms of triaxial rotation and anharmonic vibrations.

Systematics of coulomb-nuclear interference: Implications for reliable measurement of the reorientation effect

Data are presented which show an inverse correlation between Coulomb excitation probability and the nuclear separation corresponding to onset of Coulomb-nuclear interference. They demonstrate that the safe energy for reorientation effect measurements should always be determined experimentally.

Reorientation effect measurements inTe122andTe128

Measurements of the Coulomb excitation probabilities of the first ${2}^{+}$ state of $^{122}\mathrm{Te}$ and $^{128}\mathrm{Te}$ were carried out using back-scattered ions of $^{4}\mathrm{He}$, $^{14}\mathrm{N}$, $^{16}\mathrm{O}$, and $^{18}\mathrm{O}$. Quadrupole moments ${Q}_{{2}^{+}}$ and reduced transition probabilities $B(E2; {0}^{+}\ensuremath{\rightarrow}{2}^{+})$ were determined. The ${Q}_{{2}^{+}}$ deduced for the positive sign of the $2_{2}^{}{}_{}{}^{+}$ interference term are $\ensuremath{-}0.57\ifmmode\pm\else\textpm\fi{}0.05 e$ b and $\ensuremath{-}0.06\ifmmode\pm\else\textpm\fi{}0.05 e$ b for $^{122}\mathrm{Te}$ and $^{128}\mathrm{Te}$, respectively.[NUCLEAR REACTIONS $^{122,128}\mathrm{Te}(\ensuremath{\alpha},{\ensuremath{\alpha}}^{\ensuremath{'}})$, ${E}_{\ensuremath{\alpha}}=8\ensuremath{-}10$ MeV; $^{122,128}\mathrm{Te}$($^{14}\mathrm{N}$, $^{14}\mathrm{N}$'), ${E}_{{14}_{\mathrm{N}}}=32\ensuremath{-}37$ MeV; $^{122,128}\mathrm{Te}$($^{16}\mathrm{O}$, $^{16}\mathrm{O}$'), ${E}_{{16}_{\mathrm{O}}}=30.5\ensuremath{-}42$ MeV; $^{122}\mathrm{Te}$($^{18}\mathrm{O}$, $^{18}\mathrm{O}$'), ${E}_{{18}_{\mathrm{O}}}=34\ensuremath{-}35$ MeV; measured $\ensuremath{\sigma}({E}_{\ensuremath{\alpha}},{E}_{{\ensuremath{\alpha}}^{\ensuremath{'}}})$, $\ensuremath{\sigma}({E}_{{14}_{\mathrm{N}}},{E}_{{14}_{{\mathrm{N}}^{\ensuremath{'}}}})$, $\ensuremath{\sigma}({E}_{{16}_{\mathrm{O}}},{E}_{{16}_{{\mathrm{O}}^{\ensuremath{'}}}})$, $\ensuremath{\sigma}({E}_{{18}_{\mathrm{O}}},{E}_{{18}_{{\mathrm{O}}^{\ensuremath{'}}}})$. $^{122,128}\mathrm{Te}$ deduced ${Q}_{{2}^{+}}$, $B(E2,{0}^{+}\ensuremath{\rightarrow}{2}^{+})$. Enriched targets.]

Reorientation effect measurements for even mercury isotopes

Reorientation effect measurements for even mercury isotopes

Reorientation effect measurements of 122Te and 130Te

Coulomb excitation probabilities of the first 2 + states of 122Te and 130Te have been determined. The measurement was performed by resolving the inelastically and elastically scattered 4He and 16O projectiles using eight surface barrier detectors between 44° and 173°. Quadrupole moments Q 2 + as well as B(E2, 0 + → 2 +) values were deduced. The Q 2 + found for the positive sign of the 2 2 + interference term are −0.46±0.05 e · b and −0.15±0.10 e · b for 122Te and 130Te respectively.

Excitation of vibrational states in114Cd by inelastic electron scattering

Inelastic electron scattering form factors for excitation of states up to 2.4 MeV in 114Cd have been obtained in the momentum-transfer range between 0.37 and 1.09 fm-1. The 21+ quadrupole moment and 22+ radiative transition rates are deduced using a vibrational model in which one- and two-phonon states are mixed. The results obtained are in excellent agreement with recent reorientation effect measurements. Inclusion of higher momentum transfer data favours a 3- assignment for the 1.957 MeV level. The 4+ level at 2.35 MeV is shown to have an enhanced transition rate, making it a candidate for the single-phonon hexadecupole transition.

Reorientation effect measurements in 106, 114Cd

Abstract The static electric quadrupole moments Q 2 + of the first 2 + states of 106 Cd and 114 Cd were measured by the reorientation effect, using a particle-γ coincidence technique. The attenuation of the γ-ray angular distribution due to the hyperfine interaction was measured and its effect found to be important for the determination of the quadrupole moments. The values of Q 2 + obtained range from −0.63 b to −0.99 b for 106 Cd and from −0.21 b to −0.52 b for 114 Cd. The measured value for 114 Cd is 46 % of the value obtained without accounting for the hyperfine attenuation.