M1 Resonances in Unstable Magic Nuclei

Within a microscopic approach which takes into account RPA configurations, the single-particle continuum and more complex $1p1h\otimes phonon$ configurations isoscalar and isovector M1 excitations for the unstable nuclei ${56,78}$Ni and ${100,132}$Sn are calculated. For comparison, the experimentally known M1 excitations in ${40}$Ca and $^{208}$Pb have also been calculated. In the latter nuclei good agreement in the centroid energy, the total transition strength and the resonance width is obtained. With the same parameters we predict the magnetic excitations for the unstable nuclei. The strength is sufficiently concentrated to be measurable in radioactive beam experiments. New features are found for the very neutron rich nucleus ${78}$Ni and the neutron deficient nucleus ${100}$Sn.Comment: 17 pages (LATEX), 12 figures (available from the authors), KFA-IKP(TH)-1993-0

Fifth European Dirofilaria and Angiostrongylus Days (FiEDAD) 2016

Peer reviewe

A microscopic approach to self-consistent calculations in nuclei

A density-dependent effective interaction based on a modified G-matrix effective interaction which is suited for both the microscopic description of finite nuclei ground states and nuclear matter can be obtained within the framework of the Brueckner-Hartree-Fock theory. Such an effective interaction includes the correct long-range behavior of the N-N potential (via the OPEP), the tensor interaction, medium effects and short-range correlations. For a quantitative description of the bulk properties of nuclear matter and finite nuclei, it is necessary to account for effects beyond the standard two-body, non-relativistic approach of the G-matrix theory. A simple short-range semi-empirical model for these effects seems to be quite satisfactory especially for finite nuclei where the binding energies, radii and charge density distributions are well reproduced. (orig.)Available from TIB Hannover: H93B1188 / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEDEGerman

Inter-pack, seasonal and annual variation in prey consumed by wolves in Pollino National Park, southern Italy

Although understanding of food habits of wolves in human-modified landscapes is critical to inform conservation and conflict management, no such studies have ever been conducted in the southern Apennines, Italy, where wolves long coexisted with humans. By means of scat analysis (n = 1743) and log-linear modelling, we investigated diet composition in five wolf packs in the relatively simple prey system of the Pollino National Park (PNP), southern Italy (1999−2003). Overall, although wild boar was the most frequently consumed prey (mean frequency ± SD, 63.1 ± 23%), both wild boar and cattle predominated the diet in terms of biomass (45.3 ± 24 and 48.1 ± 21%, respectively). We revealed, however, a zonal (i.e. area, pack) followed by annual and seasonal effects on the wolf diet. Cattle consumption by wolf packs in the northern portion of PNP (Pollino subrange) was highest, especially during summer when cattle predominated the diet in terms of biomass (68.3 ± 20%). Instead, wild boar consumption was highest in the Orsomarso packs (biomass, 62.1 ± 13%), with increasing trends throughout the study period but no relevant seasonal variation. Wild boar piglets and cattle calves were the most frequently consumed age classes, revealing their availability year-round and higher profitability compared to other prey. Cattle consumption by wolves reflected prevailing husbandry techniques (free-ranging herds with unattended births) and determined a permanent state of conflict, often spurring retaliatory killing of wolves. Compatible cattle husbandry practices, along with the restoration of multi-prey communities, are needed to reduce wolf-livestock conflicts and possibly enhance the ecological role of wolves in human-altered ecosystems