No abstract

No abstract

No abstract

It is proposed to measure the magnetic moment of 49 Sc by the Nuclear Magnetic Resonance on Oriented Nuclei (NMR-ON) method using the NICOLE on-line nuclear orientation facility. 49Sc is the neutron rich, doubly closed-shell, nucleus 48 Ca plus one proton. Results will be used to deduce the effective g-factors in the 48 Ca region with reference to nuclear structure and meson exchange current effects.

No abstract

Abstract:The analyses of radioactive isotopes 14 C, 137 Cs and 210 Pb, and stable isotope 13 C were performed in the sediment cores, top 40 cm, taken in 2011 from karst lakes Prošće and Kozjak in the Plitvice Lakes National Park, central Croatia. Frozen sediment cores were cut into 1 cm thick layers and dried. 14 C activity in both carbonate and organic fractions was measured using accelerator mass spectrometry technique with graphite synthesis. 137 Cs, 210 Pb, 214 Pb and 214 Bi were measured by low level gamma spectrometry method on ORTECHPGe detector with the efficiency of 32%. Distribution of 14 C activity from both lakes showed increase of the 14 C activity in the top 10 − 12 cm in both carbonate and organic fractions as a response to thermonuclear bomb-produced 14 C in the atmosphere in the sixties of the 20th century. Anthropogenically produced 137 Cs was also observed in sediment profiles. Sedimentation rates for both lake sediments were estimated based on the unsupported 210 Pb activity. Different 14 C activity of the carbonate fraction (63−80 pMC, percent of modern carbon) and organic fraction (82 − 93 pMC) is the result of geochemical and biological processes of the sediment precipitation in the lake waters. This is also confirmed by the δ 13 C values of both fractions. Carbon isotope composition, 14 C and δ 13 C , was compared with the lake sediments from the same lakes collected in 1989 and 2003. 29.30 Kv, 91.65.Dt, 91.67.Qr, 91.67.Rx, 92.20.Td, 92.20.Xy PACS (2008):

No abstract

No abstract