86 research outputs found
On the critical energy required for homogeneous nucleation in bubble chambers employed in dark matter searches
Two equations for the calculation of the critical energy required for
homogeneous nucleation in a superheated liquid, and the related critical radius
of the nucleated vapour bubble, are obtained, the former by the direct
application of the first law of thermodynamics, the latter by considering that
the bubble formation implies the overcoming of a barrier of the free enthalpy
potential. Comparisons with the currently used relationships demonstrate that
the sensitivity of the bubble chambers employed in dark matter searches can be
sometimes notably overestimated.Comment: 15 pages, 5 figures, 1 tabl
Ensilagem de gramíneas tropicais em sistema de integração lavoura pecuária.
O objetivo deste estudo foi avaliar a ensilagem de Brachiaria brizantha cv. BRS Piatã e de Sorghum spp. cv. BRS 800, em monocultivo e em consórcio, em sucessão à cultura da soja, em sistema de integração lavoura-pecuária
Realistic loophole-free Bell test with atom-photon entanglement
The establishment of nonlocal correlations, obtained through the violation of
a Bell inequality, is not only important from a fundamental point of view, but
constitutes the basis for device-independent quantum information technologies.
Although several nonlocality tests have been performed so far, all of them
suffered from either the locality or the detection loopholes. Recent studies
have suggested that the use of atom-photon entanglement can lead to Bell
inequality violations with moderate transmission and detection efficiencies. In
this paper we propose an experimental setup realizing a simple atom-photon
entangled state that, under realistic experimental parameters available to
date, achieves a significant violation of the Clauser-Horn-Shimony-Holt
inequality. Most importantly, the violation remains when considering typical
detection efficiencies and losses due to required propagation distances.Comment: 21 pages, 5 figures, 3 table, to appear in Nature Com
Effects of the thermodynamic conditions on the acoustic signature of bubble nucleation in superheated liquids used in dark matter search experiments
[EN] In the framework of the search for dark matter in the form of WIMPs using superheated liquids, a study is conducted to establish a computational procedure aimed at determining how the thermodynamic conditions kept inside a particle detector affect the acoustic signal produced by bubble nucleation. It is found that the acoustic energy injected into the liquid by the growing vapour bubble increases as the liquid pressure is decreased and the superheat degree is increased, the former effect being crucial for the generation of a well-intelligible signal. A good agreement is met between the results of the present study and some experimental data available in the literature for the amplitude of the acoustic signal. Additionally, the higher loudness of the alpha-decay events compared with those arising from neutron-induced nuclear recoils is described in terms of multiple nucleations.The authors are grateful to Walter Fulgione for the valuable discussions and suggestions and for his help in reviewing the manuscript.Ardid Ramírez, M.; Baschirotto, A.; Burgio, N.; Corcione, M.; Cretara, L.; De Matteis, L.; Felis-Enguix, I.... (2019). Effects of the thermodynamic conditions on the acoustic signature of bubble nucleation in superheated liquids used in dark matter search experiments. The European Physical Journal C. 79(11):1-9. https://doi.org/10.1140/epjc/s10052-019-7485-xS197911W.J. Bolte et al., Nucl. Instr. Meth. Phys. Res. A 577, 569–573 (2007)E. Behnke et al., Astropart. Phys. 90, 85–92 (2017)M. Felizardo et al., E3S Web Conf. 12, 03002 (2016)E. Behnke et al., Phys. Rev. D 88, 021101 (2013)C. Amole et al., Phys. Rev. Lett. 118, 251301 (2017)A. Antonicci et al., Eur. Phys. J. C 77, 752 (2017)D.A. Glaser, Phys. Rev. 87, 655 (1952)F. Seitz, Phys. Fluids 1, 2–13 (1958)E. Behnke et al., Phys. Rev. Lett. 106, 021303 (2011)D.A. Glaser, D.C. Rahm, Phys. Rev. 97, 474–479 (1955)Yu.N. Martynyuk, N.S. Smirnova, Sov. Phys. Acoust. 37, 376–378 (1991)F. Aubin et al., New J. Phys. 10, 103017 (2008)M. Felizardo et al., Nucl. Instr. Meth. Phys. Res. A 589, 72–84 (2008)P.K. Mondal, B.K. Chatterjee, Phys. Lett. A 375, 237–244 (2011)S. Archambault et al., New J. Phys. 13, 043006 (2011)C. Amole et al., Phys. Rev. Lett. 114, 231302 (2015)R. Sarkar et al., Phys. Lett. A 381, 2531–2537 (2017)I.A. Pless, R.J. Plano, Rev. Sci. Instr. 27, 935–937 (1956)D.V. Bugg, Progr. Nucl. Phys. 7, 2–52 (1959)A. Norman, P. Spiegler, Nucl. Sci. Eng. 16, 213–217 (1963)A.G. Tenner, Nucl. Instr. Meth. 22, 1–42 (1963)Ch. Peyrou, In Bubble and Spark Chambers (Academic Press, New York, 1967)C.R. Bell et al., Nucl. Sci. Eng. 53, 458–465 (1974)G. Bruno et al., Eur. Phys. J. C 79, 183 (2019)B.M. Dorofeev, V.I. Volkova, High Temp. 43, 620–627 (2005)L.D. Landau, E.M. Lifshitz, Fluid Mechanics. Course of Theoretical Physics, vol 6, 2nd edn. (Butterworth-Heinemann, Kidlington, Oxford, 1987)Y.Y. Sun, B.T. Chu, R.E. Apfel, J. Comp. Phys. 103, 126–140 (1992)M.S. Plesset, S.A. Zwick, J. Appl. Phys. 25, 493–500 (1954)L.E. Scriven, Chem. Eng. Sci. 10, 1–13 (1959)H.S. Lee, H. Merte, Int. J. Heat Mass Transf. 39, 2427–2447 (1996)A.J. Robinson, R.L. Judd, Int. J. Heat Mass Transf. 47, 5101–5113 (2004)F. d’Errico, Rad. Prot. Dos. 84, 55–62 (1999)B.B. Mikic, W.M. Rohsenow, P. Griffith, Int. J. Heat Mass Transf. 13, 657–666 (1970)P.J. Linstrom, W.G. Mallard (eds.) NIST Chemistry WebBook, NIST-SRD 69 (National Institute of Standards and Technology, Gaithersburg, MD). https://doi.org/10.18434/T4D303M. Barnabé-Heider et al., Nucl. Instr. Meth. Phys. Res. A 555, 184–204 (2005)D.V. Jordan et al., Appl. Rad. Isot. 63, 645–653 (2005
VizieR Online Data Catalog: Catalog of dense cores in Aquila from Herschel (Konyves+, 2015)
Based on Herschel Gould Belt survey (Andre et al., 2010A&A...518L.102A) observations of the Aquila cloud complex, and using the multi-scale, multi-wavelength source extraction algorithm getsources (Men'shchikov et al., 2012A&A...542A..81M), we identified a total of 749 dense cores, including 685 starless cores and 64 protostellar cores. The observed properties of all dense cores are given in tablea1.dat, and their derived properties are listed in tablea2.dat. (4 data files)
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