Bragg gravity-gradiometer using the 1^1S0_0-3^3P1_1 intercombination transition of 88^{88}Sr

We present a gradiometer based on matter-wave interference of alkaline-earth-metal atoms, namely $^{88}$Sr. The coherent manipulation of the atomic external degrees of freedom is obtained by large-momentum-transfer Bragg diffraction, driven by laser fields detuned away from the narrow $^1$S$_0$-$^3$P$_1$ intercombination transition. We use a well-controlled artificial gradient, realized by changing the relative frequencies of the Bragg pulses during the interferometer sequence, in order to characterize the sensitivity of the gradiometer. The sensitivity reaches $1.5 \times 10^{-5}$ s$^{-2}$ for an interferometer time of 20 ms, limited only by geometrical constraints. We observed extremely low sensitivity of the gradiometric phase to magnetic field gradients, approaching a value 10$^{5}$ times lower than the sensitivity of alkali-atom based gradiometers. An efficient double-launch technique employing accelerated red vertical lattices from a single magneto-optical trap cloud is also demonstrated. These results highlight strontium as an ideal candidate for precision measurements of gravity gradients, with potential application in future precision tests of fundamental physics.Comment: 10 pages, 7 figure

LEAF COMPRESSIONS FROM THE LATE MIOCENE SECTIONS OF NW ITALY: RESEARCH ON AN EFFICIENT, EASY AND QUICK CONSOLIDATION TREATMENT

Cimino, Dafne, Chiantore, Oscar, Martinetto, Edoardo, Damarco, Pero, Poli, Tommaso (2016): Leaf Compressions From The Late Miocene Sections Of Nw Italy: Research On An Efficient, Easy And Quick Consolidation Treatment. Fossil Imprint 72 (3-4): 172, DOI: 10.14446/FI.2016.172, URL: http://fi.nm.cz/clanek/leaf-compressions-from-the-late-miocene-sections-of-nw-italy-research-on-an-efficient-easy-and-quick-consolidation-treatment