Results 1 - 10 of 45797
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[en] The shape of platinum isotopes is considered. Microscopic calculations of the potential energy surface contradict suggestions that these nuclei should be triaxial. The proof of resolving of the platinum isotopes structure using results of Coulomb excitation is made. (S.B.)
[en] We investigate the many-body quantum states of a laser-driven gas of Rydberg atoms confined to a large spacing ring lattice. If the laser driving is much stronger than the van der Waals interaction among the Rydberg atoms, these many-body states are collective fermionic excitations. The first excited state is a spin wave that extends over the entire lattice. We demonstrate that our system permits us to study fermions in the presence of disorder although no external atomic motion takes place. We analyze how this disorder influences the excitation properties of the fermionic states. Our work shows a route towards the creation of complex many-particle states with atoms in lattices.
[en] The 242mAm isomer, a well-known candidate for photo-depopulation research, has been studied in this first ever Coulomb excitation of a nearly pure (∼ 98%) isomer target. Thirty new states, including a new rotational band built on a Kπ = 6- state have been identified. Strong K-mixing results in nearly equal populations of the Kπ = 5- and 6- states. Newly identified states have been assigned to the Kπ = 3- rotational band, the lowest states of which are known to decay into the ground-state band. Implications regarding K-mixing and Coulomb excitation paths to the ground state are discussed
[en] In this paper the relevant aspects of the semiclassical theory of coulomb excitation is first outlined. This is followed by a discussion of the influence of nuclear interactions on the interpretation of the reorientation effect measurements. Experimental techniques with emphasis on recent developments, in light of the present understanding of the various corrections, are then touched upon. The discussion concludes with a critical survey of reorientation results in the A approximately 100 region. (Auth.)
[en] Collective properties of 206Pb, 207Pb, 208Pb and 209Bi have been investigated with gamma-ray spectroscopy using electromagnetic excitation by 208Pb projectiles. By measuring the absolute yields of the de-excitation γ-rays, B(E3) values for the 1-phonon octupole vibrational states were obtained. While the present data for 208Pb and 209Bi are consistent with earlier publications, much smaller values have been found for 206Pb abd 207Pb. Only for the doubly magic nucleus 208Pb one observes the largest octupole collectivity of 34 Weisskopf units (W.u.), which is reduced to 60-70% by the particle-vibration coupling in nuclei which consist of the 208Pb core plus (or minus) a few nucleons. As a consequence of the phonon vibration character of the 3- state, one expects a quadruplet of 2-phonon octupole states with spins and parities 0+, 2+, 4+ and 6+ at about twice the energy of the 1-phonon state. A first scattering experiment suggesting the observation of at least one member of the 2-phonon multiplet was performed via the reaction 208Pb+208Pb at an incident energy well above the Coulomb barrier. In the present experiment the system 208Pb+208Pb has been reinvestigated via Coulomb excitation at a safe bombarding energy at 5.0 MeV/u. The reduced cross-section for the excitation of the octupole states has been compensated by the higher full energy efficiency of five EUROBALL CLUSTER detectors. With the present experimental set-up transition probabilities down to 10-5-10-6 can be measured