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[en] It is shown that 152Sm and other N=90 isotones are the first empirical manifestation of the newly predicted analytic description of nuclei at the critical point of a vibrator to axial rotor phase transition
[en] The region of light actinides (Z∼88,N∼134), which is thought to exhibit signs of stable octupole deformation, offers a real challenge for nuclear structure models. We study the even-even Ra-Th nuclei in the framework of the spdf interacting boson model and we find that while the properties of the low-lying states can be understood without stable octupole deformation, higher spin states (J∼>12ℎ) in some of these nuclei (e.g., 226Ra) suggest that octupole deformation develops with increasing spin. We also discuss how octupole deformation can arise in the rotational (dynamical symmetry) limit
[en] In a study parallel to one recently carried out for the interacting boson model, the behavior of the geometric collective model (GCM) with (partially restricted) random interactions is studied. In particular, we study the frequency distribution of E(41+)/E(21+) ratios. In addition, we characterize those GCM potentials giving E(5) spectra and distinguish them from others giving R4/2∼2.3 but non-E(5) spectra
[en] The Extreme Light Infrastructure - Nuclear Physics facility (ELI-NP) to be constructed in Bucharest-Magurele will be one of the three pillars of ELI and will consist of two components: a very high intensity laser beam and a very intense (1013 γ/s), brilliant γ beam, 0.1% bandwidth, with Eγ = 19 MeV. ELI-NP will allow either combined experiments between the high-power laser and the γ beam or stand-alone experiments. This facility will create a new European laboratory with a broad range of science covering frontier fundamental physics, new nuclear physics and astrophysics as well as applications. A review of the Project and the Status of its implementation will be presented.
[en] Recent theoretical and experimental work focusing on nuclei in spherical-deformed transition regions has sparked considerable interest in phase transitional nuclei. A review of searches and experimental results on critical point nuclei in the A = 130 and A = 150 regions is presented
[en] It is shown that the Mallmann's energy ratio correlations, first time proposed 50 years ago for the ground state bands of the even-even nuclei, are universal: all band structures in collective nuclei obey the same systematics. Based on a second order anharmonic vibrator description, parameter-free recurrence relations are proposed for Mallmann-type energy ratios, which can be used to extrapolate band structures to higher spin.
[en] It is shown that the Mallmann's energy correlations, introduced a long time ago for the ground state bands of the even-even nuclei are, in fact, universal. Various bands in all collective nuclei (even-even, odd-even, and odd-odd) obey the same systematics. This unique, universal behaviour indicates the same spin dependence of the energy of the levels and, consequently, a common structure of all collective bands. Based on the second-order anharmonic vibrator description, parameter-free recurrence relations between energy ratios are deduced. These relations can be used to predict levels of higher spins in various bands.
[en] Recent experiments on 152Sm have revealed a possibly unique type of phase transitional behavior and phase coexistence in nuclei and focus attention on a potential signature for such a phenomenon. The question of the existence of true phase transitional behavior and phase coexistence in finite nuclei is discussed in terms of the discrete nature of nucleon number and a possible control parameter for nuclear structural evolution