123191123
Nuclear rainbow in the 16O + 27AL system: The role of couplings at energies far above the barrier
Abstract High precision elastic and inelastic angular distributions have been measured for the 16 O +  27 Al system at a beam energy of 100 MeV. The data analysis confirms a rainbow formation as already predicted by parameter-free Coupled Channel calculations. It also helps to reveal the crucial role of inelastic couplings in the rainbow formation for heavier systems even at energies far above the Coulomb barrier. This feature, well known in atomic/molecular scattering, is experimentally studied for the first time in Nuclear Physics.
121674344
Influence of valence neutron configuration on quadrupole deformation in doubly-odd 134 Pr
Lifetimes of levels in two doubly-decoupled bands of ${}^{134}\mathrm{Pr}$ involving neutron intruder orbits have been measured using Doppler-shift techniques. The deduced transition quadrupole moments are consistent with total Routhian surface predictions for the suggested configurations of both bands. The negative-parity band with one neutron in the ${i}_{13/2}$ orbit has a much larger quadrupole deformation than the positive-parity band with a neutron in the ${(f}_{7/2}{/h}_{9/2})$ orbit, reflecting the strong polarizing effect of the $N=6$ intruder orbit on the nuclear shape.
29454387
Lifetimes of the decay from superdeformed to normal deformed in 135Nd.
Lifetimes of low-spin members of the superdeformed band in [sup 135]Nd have been determined by the Doppler-shift recoil-distance method. We find a quadrupole moment of 7.2[sub [minus]1.5][sup +1.2] b for the 677 keV (37/2- 33) / 2 transition in the band, confirming the large deformation previously measured by the Doppler-shift attenuation method. However, the quadrupole moment for the 620 keV transition deexciting the 3.324 MeV (25/2) state at the bottom of the band is much smaller. We conclude that the superdeformed potential-energy minimum disappears or the band drastically changes character at this point which causes the sudden depopulation.
120551728
Magnetic dipole and electric quadrupole rotational structures and chirality in Rh-105
The $^{105}\mathrm{Rh}$ nucleus has been studied with the $^{100}\mathrm{Mo}(^{11}\mathrm{B},\ensuremath{\alpha}2n\ensuremath{\gamma})$ reaction at $43\phantom{\rule{0.3em}{0ex}}\text{MeV}$ incident energy. A rich variety of structures was observed at high and low spins, using $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}\text{\ensuremath{-}}t$ and $\ensuremath{\gamma}\text{\ensuremath{-}}\ensuremath{\gamma}\text{\ensuremath{-}}\mathit{particle}$ coincidences and directional correlation ratios. A $\ensuremath{\gamma}$-vibrational band was observed for the first time in this nucleus. A new structure based on the intruder $1∕{2}^{+}$[431] proton orbital was identified. Four magnetic dipole bands have also been observed at high spin, three of which have negative parity and have similar characteristics: they are very regular in energy spacing, presenting nearly constant alignments and large values of $B(M1)∕B(E2)$ ratios. Two of them are nearly degenerate in excitation energy and could be chiral partners. The $\ensuremath{\pi}{g}_{9∕2}\ensuremath{\bigotimes}\ensuremath{\nu}{h}_{11∕2}({g}_{7∕2},{d}_{5∕2})$ configuration is tentatively assigned for these bands, with the angular momenta of the proton and neutron intruders and the collective angular momentum aligning along the three perpendicular axes of the triaxial core, as predicted by tilted axis cranking calculations.
1175616
Multiple dipole bands at prolate shapes in 136Nd and their description through the projected shell model.
Five bands dominated by strong {ital M}1 transitions have been observed in the {sup 136}Nd nucleus. Two of them consist of only dipole transitions, whereas the other three show also weak crossover transitions. The bands have been firmly connected to lower-spin states. Theoretical calculations using the projected shell model suggest quasiparticle configurations involving two protons and two neutrons for the four lowest-lying bands. {copyright} {ital 1996 The American Physical Society.}
120421643
Observation of double electron-positron pair production by γ rays reexamined
An experiment was conducted to observe triple- and quadruple-escape peaks, at a photon energy equal to 6.128 MeV, in the spectra recorded with a high-purity Ge detector working in coincidence with six bismuth germanate detectors. The peak intensities may be explained having recourse to only the bremsstrahlung cascade process of consecutive electron-positron pair creation; i.e., the contribution of simultaneous double pair formation (and other cascade effects) is much smaller. The experimental peak areas are in reasonably good agreement with those predicted by Monte Carlo simulations done with the general-purpose radiation-transport code PENELOPE.
119432093
Solutions for Klein-Gordon equation in Randall-Sundrum-Kerr scenario
We study the scalar perturbations of rotating black holes in framework of extra dimensions type Randall-Sundrum(RS).