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76 results on '"Charbonnier, Y."'

1. Photon production in heavy-ion collisions close to the pion threshold

Author

Martinez, G., Aphecetche, L., Charbonnier, Y., Delagrange, H., d'Enterria, D., Matulewicz, T., Schutz, Y., Turrisi, R., Appenheimer, M., Metag, V., Novotny, R., Stroeher, H., Wolf, A. R., Wolf, M., Weiss, J., Averbeck, R., Hlavavc, S., Holzmann, R., Lefevre, F., Simon, R. S., Stratmann, R., Wissmann, F., Hoefman, M., van Goethem, M. J., Loehner, H., Ostendorf, R. W, Siemssen, R. H., Vogt, P., Wilschut, H. W., Diaz, J., Marin, A., Kugler, A., Tlusty, P., Wagner, V., and Doeppenschmidt, A.

Subjects
Nuclear Experiment
Abstract

We report on a measurement of hard photons (Eg>30 MeV) in the reaction Ar+Ca at 180A MeV at an energy in which photons from the decay of pi0 mesons are dominating. Simultaneous measurement with the TAPS spectrometer of the photon spectrum and photon-photon coincidences used for the identification of pi0 enabled the subtraction of pi0 contribution. The resulting photon spectrum exhibits an exponential shape with an inverse slope of E0=(53+-0.03(stat)-5+8(syst)) MeV. The photon multiplicity, equal to (1.21+-0.03(stat)+0.3-0.2(syst))10E0-2, is roughly one order of magnitude larger than the value extrapolated from existing systematics. This enhancement of the hard photon production is attributed to a strong increase in the contribution of secondary np collisions to the total photon yield. We conclude that, on average, the number of np collisions which contribute to the hard photon production is 7 times larger than the number of first chance np collisions in the reaction Ar+Ca at 180A MeV., Comment: 15 pages, 4 figures, references added

Published
1999
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2. Elliptic flow of $\eta$ and $\pi^{0}$ Mesons in Heavy-Ion Collisions at 2 AGeV

Author

Taranenko, A., Kugler, A., Pleskac, R., Tlusty, P., Wagner, V., Lohner, H., Ostendorf, R. W., Siemssen, R. H., Vogt, P. H., Wilschut, H. W., Averbeck, R., Hlavac, S., Holzmann, R., Schubert, A., Simon, R. S., Stratmann, R., Wissmann, F., Charbonnier, Y., Martinez, G., Schutz, Y., Diaz, J., Marin, A., Doppenschmidt, A., Appenheimer, M., Hejny, V., Metag, V., Novotny, R., Stroher, H., Weiss, J., Wolf, A. R., Wolf, M., and Collaboration, TAPS

Subjects
Nuclear Experiment
Abstract

Azimuthal distributions of $\eta$ and $\pi^{0}$ mesons emitted at midrapidity in collisions of 1.9 AGeV $^{58}$Ni+$^{58}$Ni and 2 AGeV $^{40}$Ca+$^{nat}$Ca are studied as a function of the number of projectile-like spectator nucleons. The observed anisotropy corresponds to a negative elliptic flow signal for $\eta$ mesons, indicating a preferred emission perpendicular to the reaction plane. In contrast, only small azimuthal anisotropies are observed for $\pi^{0}$ mesons. This may indicate that $\eta$ mesons freeze out earlier from the fire ball than pions., Comment: 34 pages, presented at V TAPS workshop, Rez, September 4-8. 1999

Published
1999

3. Azimuthal Anisotropy of $\eta$ and $\pi^{0}$ Mesons in Heavy-Ion Collisions at 2 AGeV

Author

Taranenko, A., Kugler, A., Pleskac, R., Tlusty, P., Wagner, V., Lohner, H., Ostendorf, R. W., Siemssen, R. H., Vogt, P. H., Wilschut, H. W., Averbeck, R., Hlavac, S., Holzmann, R., Schubert, A., Simon, R. S., Stratmann, R., Wissmann, F., Charbonnier, Y., Martinez, G., Schutz, Y., Diaz, J., Marin, A., Doppenschmidt, A., Appenheimer, M., Hejny, V., Metag, V., Novotny, R., Stroher, H., Weiss, J., Wolf, A. R., Wolf, M., and Collaboration, TAPS

Subjects
Nuclear Experiment
Abstract

Azimuthal distributions of $\eta$ and $\pi^{0}$ mesons emitted at midrapidity in collisions of 1.9 AGeV $^{58}$Ni+$^{58}$Ni and 2 AGeV $^{40}$Ca+$^{nat}$Ca are studied as a function of the number of projectile-like spectator nucleons. The observed anisotropy corresponds to a negative elliptic flow signal for $\eta$ mesons, indicating a preferred emission perpendicular to the reaction plane. The effect is smallest in peripheral Ni+Ni collisions. In contrast, for $\pi^{0}$ mesons, elliptic flow is observed only in peripheral Ni+Ni collisions, changing from positive to negative sign with increasing pion transverse momentum., Comment: 4 pages, 2 figures, Submitted to Phys. Rev. Lett

Published
1999

4. Biodiversity conservation, ecosystem services and organic viticulture: A glass half-full

Author

Ministerio de Ciencia e Innovación (España), Austrian Science Fund, Federal Ministry of Education and Research (Germany), Beaumelle, L., Giffard, B., Tolle, P., Winter, S., Entling, M.H., Benítez León, Emilio, Zaller, J.G., Auriol, A., Bonnard, O., Charbonnier, Y., Fabreguettes, O., Joubard, B., Kolb, S., Ostandie, N., Reiff, J.M., Richart-Cervera, S., Rusch, A., Ministerio de Ciencia e Innovación (España), Austrian Science Fund, Federal Ministry of Education and Research (Germany), Beaumelle, L., Giffard, B., Tolle, P., Winter, S., Entling, M.H., Benítez León, Emilio, Zaller, J.G., Auriol, A., Bonnard, O., Charbonnier, Y., Fabreguettes, O., Joubard, B., Kolb, S., Ostandie, N., Reiff, J.M., Richart-Cervera, S., and Rusch, A.

Abstract

Organic farming is a promising but still debated option to ensure sustainable agriculture. However, whether organic farming fosters synergies or mitigates tradeoffs between biodiversity, ecosystem services and crop production has rarely been quantified. Here, we investigate relationships between multitrophic diversity (14 taxa above and belowground), yield, natural pest control and soil quality (14 proxies of ecosystem services) in organic and conventional vineyards along a landscape gradient. Organic farming enhanced biodiversity and pest control, but decreased wine production. Compared to conventional systems, multitrophic diversity was 15 % higher, and pest control services were 9 % higher in organic systems, while wine production was 11 % lower. Regardless of management type, we found a strong tradeoff between wine production and pest control, but not between wine production and biodiversity. The landscape context was not a strong moderator of organic farming effects across taxa groups and ecosystem services, but affected specific taxa and ecosystem services, especially natural pest control. Our study reveals that wine production and biodiversity conservation do not necessarily exclude each other, which implies the existence of a safe operating space where biodiversity and wine production can be combined. We conclude that organic farming can contribute to improve the sustainability of viticulture, but needs to be complemented by management options at the local and landscape scales in order to fully balance biodiversity conservation with the simultaneous provision of multiple ecosystem services.

Published
2023

5. Observation of Δ+→ pπ0 decay in heavy-ion collisions

Author

Matulewicz, T., Aphecetche, L., Charbonnier, Y., Delagrange, H., Gudima, K.K., Martınez, G., Płoszajczak, M., Schutz, Y., Toneev, V.D., Appenheimer, M., Averbeck, R., Dıaz, J., Döppenschmidt, A., van Goethem, M.J., Hlavač, S., Hoefman, M., Holzmann, R., Lefèvre, F., Kugler, A., Löhner, H., Marın, A., Metag, V., Novotny, R., Ostendorf, R.W., Siemssen, R.H., Simon, R.S., Stratmann, R., Ströher, H., Tlusty, P., Vogt, P.H., Wagner, V., Weiss, J., Wilschut, H.W., Wissmann, F., Wolf, A.R., and Wolf, M.

Published
2000
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6. Identifying the tree species compositions that maximize ecosystem functioning in European forests

Author

European Commission, Benavides, Raquel [0000-0003-2328-5371], Valladares, Fernando [0000-0002-5374-4682], Bastias, Cristina C. [0000-0002-2479-2001], Allan, Eric [0000-0001-9641-9436], Baeten, L., Bruelheide, H., van der Plas, F., Kambach, S., Ratcliffe, S., Jucker, T., Allan, Eric, Ampoorter, E., Barbaro, L., Bastias, Cristina C., Bauhus, J., Benavides, Raquel, Bonal, D., Bouriaud, O., Bussotti, F., Carnol, M., Castagneyrol, B., Charbonnier, Y., Checko, Ewa, Coomes, David A., Dahlgren, J., Dawud, S.M., De Wandeler, H., Domisch, Timo, Finér, Leena, Fischer, Markus, Fotelli, M., Gessler, A., Grossiord, C., Guyot, V., Hättenschwiler, S., Jactel, H., Jaroszewicz, B., Joly, François‐Xavier, Koricheva, J., Lehtonen, A., Müller, S., Muys, Bart, Nguyen, D., Pollastrini, M., Radoglou, K., Raulund-Rasmussen, K., Ruiz-Benito, P., Selvi, F., Stenlid, J., Valladares Ros, Fernando, Vesterdal, L., Verheyen, K., Wirth, C., Zavala, M.A., European Commission, Benavides, Raquel [0000-0003-2328-5371], Valladares, Fernando [0000-0002-5374-4682], Bastias, Cristina C. [0000-0002-2479-2001], Allan, Eric [0000-0001-9641-9436], Baeten, L., Bruelheide, H., van der Plas, F., Kambach, S., Ratcliffe, S., Jucker, T., Allan, Eric, Ampoorter, E., Barbaro, L., Bastias, Cristina C., Bauhus, J., Benavides, Raquel, Bonal, D., Bouriaud, O., Bussotti, F., Carnol, M., Castagneyrol, B., Charbonnier, Y., Checko, Ewa, Coomes, David A., Dahlgren, J., Dawud, S.M., De Wandeler, H., Domisch, Timo, Finér, Leena, Fischer, Markus, Fotelli, M., Gessler, A., Grossiord, C., Guyot, V., Hättenschwiler, S., Jactel, H., Jaroszewicz, B., Joly, François‐Xavier, Koricheva, J., Lehtonen, A., Müller, S., Muys, Bart, Nguyen, D., Pollastrini, M., Radoglou, K., Raulund-Rasmussen, K., Ruiz-Benito, P., Selvi, F., Stenlid, J., Valladares Ros, Fernando, Vesterdal, L., Verheyen, K., Wirth, C., and Zavala, M.A.

Abstract

Forest ecosystem functioning generally benefits from higher tree species richness, but variation within richness levels is typically large. This is mostly due to the contrasting performances of communities with different compositions. Evidence-based understanding of composition effects on forest productivity, as well as on multiple other functions will enable forest managers to focus on the selection of species that maximize functioning, rather than on diversity per se. We used a dataset of 30 ecosystem functions measured in stands with different species richness and composition in six European forest types. First, we quantified whether the compositions that maximize annual above-ground wood production (productivity) generally also fulfil the multiple other ecosystem functions (multifunctionality). Then, we quantified the species identity effects and strength of interspecific interactions to identify the “best” and “worst” species composition for multifunctionality. Finally, we evaluated the real-world frequency of occurrence of best and worst mixtures, using harmonized data from multiple national forest inventories. The most productive tree species combinations also tended to express relatively high multifunctionality, although we found a relatively wide range of compositions with high- or low-average multifunctionality for the same level of productivity. Monocultures were distributed among the highest as well as the lowest performing compositions. The variation in functioning between compositions was generally driven by differences in the performance of the component species and, to a lesser extent, by particular interspecific interactions. Finally, we found that the most frequent species compositions in inventory data were monospecific stands and that the most common compositions showed below-average multifunctionality and productivity. Synthesis and applications. Species identity and composition effects are essential to the development of high-performing product

Published
2019

7. The PHEMU15 catalogue and astrometric results of the Jupiter's Galilean satellite mutual occultation and eclipse observations made in 2014-2015

Author

Saquet, E. Emelyanov, N. Robert, V. Arlot, J.-E. Anbazhagan, P. Baillié, K. Bardecker, J. Berezhnoy, A.A. Bretton, M. Campos, F. Capannoli, L. Carry, B. Castet, M. Charbonnier, Y. Chernikov, M.M. Christou, A. Colas, F. Coliac, J.-F. Dangl, G. Dechambre, O. Delcroix, M. Dias-Oliveira, A. Drillaud, C. Duchemin, Y. Dunford, R. Dupouy, P. Ellington, C. Fabre, P. Filippov, V.A. Finnegan, J. Foglia, S. Font, D. Gaillard, B. Galli, G. Garlitz, J. Gasmi, A. Gaspar, H.S. Gault, D. Gazeas, K. George, T. Gorda, S.Y. Gorshanov, D.L. Gualdoni, C. Guhl, K. Halir, K. Hanna, W. Henry, X. Herald, D. Houdin, G. Ito, Y. Izmailov, I.S. Jacobsen, J. Jones, A. Kamoun, S. Kardasis, E. Karimov, A.M. Khovritchev, M.Y. Kulikova, A.M. Laborde, J. Lainey, V. Lavayssiere, M. Le Guen, P. Leroy, A. Loader, B. Lopez, O.C. Lyashenko, A.Y. Lyssenko, P.G. Machado, D.I. Maigurova, N. Manek, J. Marchini, A. Midavaine, T. Montier, J. Morgado, B.E. Naumov, K.N. Nedelcu, A. Newman, J. Ohlert, J.M. Oksanen, A. Pavlov, H. Petrescu, E. Pomazan, A. Popescu, M. Pratt, A. Raskhozhev, V.N. Resch, J.-M. Robilliard, D. Roschina, E. Rothenberg, E. Rottenborn, M. Rusov, S.A. Saby, F. Saya, L.F. Selvakumar, G. Signoret, F. Slesarenko, V.Y. Sokov, E.N. Soldateschi, J. Sonka, A. Soulie, G. Talbot, J. Tejfel, V.G. Thuillot, W. Timerson, B. Toma, R. Torsellini, S. Trabuco, L.L. Traverse, P. Tsamis, V. Unwin, M. Van Den Abbeel, F. Vandenbruaene, H. Vasundhara, R. Velikodsky, Y.I. Vienne, A. Vilar, J. Vugnon, J.-M. Wuensche, N. Zeleny, P.

Subjects
Physics::Space Physics, Astrophysics::Instrumentation and Methods for Astrophysics, Astrophysics::Solar and Stellar Astrophysics, Astrophysics::Earth and Planetary Astrophysics
Abstract

During the 2014-2015 mutual events season, the Institut de Mécanique Céleste et de Calcul des Éphémérides (IMCCE), Paris, France, and the Sternberg Astronomical Institute (SAI), Moscow, Russia, led an international observation campaign to record ground-based photometric observations of Galilean moon mutual occultations and eclipses.We focused on processing the complete photometric observations data base to compute new accurate astrometric positions. We used our method to derive astrometric positions from the light curves of the events. We developed an accurate photometric model of mutual occultations and eclipses, while correcting for the satellite albedos, Hapke's light scattering law, the phase effect, and the limb darkening. We processed 609 light curves, and we compared the observed positions of the satellites with the theoretical positions from IMCCE NOE-5-2010-GAL satellite ephemerides and INPOP13c planetary ephemeris. The standard deviation after fitting the light curve in equatorial positions is ±24 mas, or 75 km at Jupiter. The rms (O-C) in equatorial positions is ±50 mas, or 150 km at Jupiter. © 2017 The Author(s).

Published
2018

8. Continental mapping of forest ecosystem functions reveals widespread synergies

Author

Van Der Plas , F, Ratcliffe, Sophia, Ruiz Benito, Paloma, Scherer-Lorenzen , Michael, Verheyen , K., Wirth, C., Zavala Gironés, Miguel Ángel de, Ampoorter , E, Baeten , L, Barbaro , L, Crespo, C, Bauhus , J, Castagneyrol, Bastien, Charbonnier , Y, Cornelissen, J.H.C., Dahlgren, J., Checko , E, Coppi , A, Dawud , S, Deconchat , M, Desmedt , P, De Wandeler , H, Domisch , T, Finer , L., Fotelli , M, Gessler , A, Granier , A, Grossiord , C, Guyot , V, Haase , J, Hattenschwiler , S, Jactel , H, Jaroszewicz , B, Joly , F-X, Jucker , T, Kambach , S, Kändler, Gerald, Kattge, Jens, Koricheva , J, Kunstler, Georges, Lehtonen, Aleksi, Liebergesell, M, Manning , P, Milligan , H, Müller , S, Muys, Bart, Nguyen , D, Nock , C, Ohse , B, Paquette , A., Peñuelas Rubira, Juan Luis, Pollastrini , M, Radoglou , K, Raulund-Rasmussen , K, Roger , F, Seidl , R, Selvi , F, Stenlid , J, Valladares Ros, Fernando, Vesterdal , L, Fischer , M, Gamfeldt , L, Eric , E, and Universidad de Alcalá. Departamento de Ciencias de la Vida

Subjects
Medio Ambiente, Climate, Upscaling, Ecosystem services, Tree communities, Biodiversity, Forest, Environmental science, Ecosystem multifunctionality, Phylogenetic diversity
Abstract

Humans require multiple services from ecosystems, but it is largely unknown whether trade‐offs between ecosystem functions prevent the realisation of high ecosystem multifunctionality across spatial scales. Here, we combined a comprehensive dataset (28 ecosystem functions measured on 209 forest plots) with a forest inventory dataset (105,316 plots) to extrapolate and map relationships between various ecosystem multifunctionality measures across Europe. These multifunctionality measures reflected different management objectives, related to timber production, climate regulation and biodiversity conservation/recreation. We found that trade‐offs among them were rare across Europe, at both local and continental scales. This suggests a high potential for 'win‐win' forest management strategies, where overall multifunctionality is maximised. However, across sites, multifunctionality was on average 45.8‐49.8% below maximum levels and not necessarily highest in protected areas. Therefore, using one of the most comprehensive assessments so far, our study suggests a high but largely unrealised potential for management to promote multifunctional forests.

Published
2018

9. Continental mapping of forest ecosystem functions reveals a high but unrealised potential for forest multifunctionality

Author

German Research Foundation, European Commission, Ministerio de Agricultura, Pesca y Alimentación (España), Plas, Fons van der, Ratcliffe, Sophia, Ruiz‐Benito, Paloma, Scherer-Lorenzen, Michael, Verheyen, K., Wirth, Christian, Zavala, Miguel A., Ampoorter, E., Baeten, Lander, Barbaro, Luc, Bastias, Cristina C., Bauhus, Jürgen, Benavides, Raquel, Benneter, Adam, Bonal, Damien, Bouriaud, Olivier, Bruelheide, Helge, Bussotti, Filippo, Carnol, M., Castagneyrol, Bastien, Charbonnier, Y., Cornelissen, Johannes H. C., Dahlgren, Jonas, Checko, Ewa, Coppi, A., Muhie Dawud, Seid, Deconchat, Marc, Smedt, Pallieter De, Wandeler, Hans De, Domisch, Timo, Finér, Leena, Fotelli, Mariangela, Gessler, Arthur, Granier, André, Grossiord, Charlotte, Guyot, Virginie, Haase, Josephine, Hättenschwiler, S., Jaroszewicz, Bogdan, Joly, François‐Xavier, Jucker, Tommaso, Kambach, Stephan, Kaendler, Gerald, Kattge, Jens, Koricheva, J., Kunstler, Georges, Lehtonen, Aleksi, Liebergesell, Mario, Manning, Peter, Milligan, H., Müller, Sandra, Muys, Bart, Nguyen, Diem, Nock, Charles A., Ohse, Bettina, Paquette, Alain, Peñuelas, Josep, Pollastrini, Martina, Radoglou, Kalliopi, Raulund‐Rasmussen, Karsten, Roger, Fabian, Seidl, Rupert, Selvi, Federico, Stenlid, Jan, Valladares Ros, Fernando, Keer, Johan van, Vesterdal, Lars, Fischer, Markus, Gamfeldt, Lars, Allan, Eric, German Research Foundation, European Commission, Ministerio de Agricultura, Pesca y Alimentación (España), Plas, Fons van der, Ratcliffe, Sophia, Ruiz‐Benito, Paloma, Scherer-Lorenzen, Michael, Verheyen, K., Wirth, Christian, Zavala, Miguel A., Ampoorter, E., Baeten, Lander, Barbaro, Luc, Bastias, Cristina C., Bauhus, Jürgen, Benavides, Raquel, Benneter, Adam, Bonal, Damien, Bouriaud, Olivier, Bruelheide, Helge, Bussotti, Filippo, Carnol, M., Castagneyrol, Bastien, Charbonnier, Y., Cornelissen, Johannes H. C., Dahlgren, Jonas, Checko, Ewa, Coppi, A., Muhie Dawud, Seid, Deconchat, Marc, Smedt, Pallieter De, Wandeler, Hans De, Domisch, Timo, Finér, Leena, Fotelli, Mariangela, Gessler, Arthur, Granier, André, Grossiord, Charlotte, Guyot, Virginie, Haase, Josephine, Hättenschwiler, S., Jaroszewicz, Bogdan, Joly, François‐Xavier, Jucker, Tommaso, Kambach, Stephan, Kaendler, Gerald, Kattge, Jens, Koricheva, J., Kunstler, Georges, Lehtonen, Aleksi, Liebergesell, Mario, Manning, Peter, Milligan, H., Müller, Sandra, Muys, Bart, Nguyen, Diem, Nock, Charles A., Ohse, Bettina, Paquette, Alain, Peñuelas, Josep, Pollastrini, Martina, Radoglou, Kalliopi, Raulund‐Rasmussen, Karsten, Roger, Fabian, Seidl, Rupert, Selvi, Federico, Stenlid, Jan, Valladares Ros, Fernando, Keer, Johan van, Vesterdal, Lars, Fischer, Markus, Gamfeldt, Lars, and Allan, Eric

Abstract

Humans require multiple services from ecosystems, but it is largely unknown whether trade‐offs between ecosystem functions prevent the realisation of high ecosystem multifunctionality across spatial scales. Here, we combined a comprehensive dataset (28 ecosystem functions measured on 209 forest plots) with a forest inventory dataset (105,316 plots) to extrapolate and map relationships between various ecosystem multifunctionality measures across Europe. These multifunctionality measures reflected different management objectives, related to timber production, climate regulation and biodiversity conservation/recreation. We found that trade‐offs among them were rare across Europe, at both local and continental scales. This suggests a high potential for ‘win‐win’ forest management strategies, where overall multifunctionality is maximised. However, across sites, multifunctionality was on average 45.8‐49.8% below maximum levels and not necessarily highest in protected areas. Therefore, using one of the most comprehensive assessments so far, our study suggests a high but largely unrealised potential for management to promote multifunctional forests.

Published
2018

10. Photon production in heavy-ion collisions close to the pion threshold

Author

Martı́nez, G., Aphecetche, L., Charbonnier, Y., Delagrange, H., d'Enterria, D., Matulewicz, T., Schutz, Y., Turrisi, R., Appenheimer, M., Metag, V., Novotny, R., Ströher, H., Wolf, A.R., Wolf, M., Weiß, J., Averbeck, R., Hlaváč, S., Holzmann, R., Lefèvre, F., Simon, R.S., Stratmann, R., Wissmann, F., Hoefman, M., van Goethem, M.J., Löhner, H., W Ostendorf, R., Siemssen, R.H., Vogt, P., Wilschut, H.W., Dı́az, J., Marı́n, A., Kugler, A., Tlusty, P., Wagner, V., and Döppenschmidt, A.

Published
1999
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11. Continental mapping of forest ecosystem functions reveals a high but unrealised potential for forest multifunctionality

Author

van der Plas, F., Ratcliffe, S., Ruiz-Benito, P., Scherer-Lorenzen, M., Verheyen, K., Wirth, C., Zavala, M.A., Ampoorter, E., Baeten, L., Barbaro, L., Bastias, C.C., Bauhus, J., Benavides, R., Benneter, A., Bonal, D., Bouriaud, O., Bruelheide, H., Bussotti, F., Carnol, M., Castagneyrol, B., Charbonnier, Y., Cornelissen, J.H.C., Dahlgren, J., Checko, E., Coppi, A., Dawud, S.M., Deconchat, M., De Smedt, P., De Wandeler, H., Domisch, T., Finér, L., Fotelli, M., Gessler, A., Granier, A., Grossiord, C., Guyot, V., Haase, J., Hättenschwiler, S., Jactel, H., Jaroszewicz, B., Joly, F.-X., Jucker, T., Kambach, Stephan, Kaendler, G., Kattge, J., Koricheva, J., Kunstler, G., Lehtonen, A., Liebergesell, M., Manning, P., Milligan, H., Müller, S., Muys, B., Nguyen, D., Nock, C., Ohse, B., Paquette, A., Peñuelas, J., Pollastrini, M., Radoglou, K., Raulund-Rasmussen, K., Roger, F., Seidl, R., Selvi, F., Stenlid, J., Valladares, F., van Keer, J., Vesterdal, L., Fischer, M., Gamfeldt, L., Allan, E., van der Plas, F., Ratcliffe, S., Ruiz-Benito, P., Scherer-Lorenzen, M., Verheyen, K., Wirth, C., Zavala, M.A., Ampoorter, E., Baeten, L., Barbaro, L., Bastias, C.C., Bauhus, J., Benavides, R., Benneter, A., Bonal, D., Bouriaud, O., Bruelheide, H., Bussotti, F., Carnol, M., Castagneyrol, B., Charbonnier, Y., Cornelissen, J.H.C., Dahlgren, J., Checko, E., Coppi, A., Dawud, S.M., Deconchat, M., De Smedt, P., De Wandeler, H., Domisch, T., Finér, L., Fotelli, M., Gessler, A., Granier, A., Grossiord, C., Guyot, V., Haase, J., Hättenschwiler, S., Jactel, H., Jaroszewicz, B., Joly, F.-X., Jucker, T., Kambach, Stephan, Kaendler, G., Kattge, J., Koricheva, J., Kunstler, G., Lehtonen, A., Liebergesell, M., Manning, P., Milligan, H., Müller, S., Muys, B., Nguyen, D., Nock, C., Ohse, B., Paquette, A., Peñuelas, J., Pollastrini, M., Radoglou, K., Raulund-Rasmussen, K., Roger, F., Seidl, R., Selvi, F., Stenlid, J., Valladares, F., van Keer, J., Vesterdal, L., Fischer, M., Gamfeldt, L., and Allan, E.

Abstract

Humans require multiple services from ecosystems, but it is largely unknown whether trade-offs between ecosystem functions prevent the realisation of high ecosystem multifunctionality across spatial scales. Here, we combined a comprehensive dataset (28 ecosystem functions measured on 209 forest plots) with a forest inventory dataset (105,316 plots) to extrapolate and map relationships between various ecosystem multifunctionality measures across Europe. These multifunctionality measures reflected different management objectives, related to timber production, climate regulation and biodiversity conservation/recreation. We found that trade-offs among them were rare across Europe, at both local and continental scales. This suggests a high potential for ‘win-win’ forest management strategies, where overall multifunctionality is maximised. However, across sites, multifunctionality was on average 45.8-49.8% below maximum levels and not necessarily highest in protected areas. Therefore, using one of the most comprehensive assessments so far, our study suggests a high but largely unrealised potential for management to promote multifunctional forests.

Published
2017

12. Biotic homogenization is more detrimental than local species loss for landscape-scale forest multifunctionality

Author

van der Plas, F., Manning, P., Soliveres, S., Allan, E., Scherer-Lorenzen, M., Verheyen, K., Wirth, C., Zavala, M., Ampoorter, E., Baeten, L., Barbaro, L., Bauhus, J., Benavides, R., Benneter, A., Bonal, D., Bouriaud, O., Bruelheide, H., Bussotti, F., Carnol, M., Castagneyrol, B., Charbonnier, Y., Coomes, D., Coppi, A., Bastias, C., Dawud, S., Wandeler, H., Domisch, T., Finér, L., Gessler, A., Granier, A., Grossiord, C., Guyot, V., Hättenschwiler, S., Jactel, H., Jaroszewicz, B., Joly, F., Jucker, T., Koricheva, J., Milligana, H., Mueller, S., Muys, B., Nguyenb, D., Pollastrini, M., Ratcliffe, S., Raulund-Rasmussen, K., Selvi, F., Stenlid, J., Valladares, F., Vesterdal, L., Zielínski, D., and Fischer, M.

Abstract

Many experiments have shown that local biodiversity loss impairs the ability of ecosystems to maintain multiple ecosystem functions at high levels (multifunctionality). In contrast, the role of biodiversity in driving ecosystem multifunctionality at landscape scales remains unresolved. We used a comprehensive pan-European dataset, including 16 ecosystem functions measured in 209 forest plots across six European countries, and performed simulations to investigate how local plot-scale richness of tree species (α-diversity) and their turnover between plots (β-diversity) are related to landscape-scale multifunctionality. After accounting for variation in environmental conditions, we found that relationships between α-diversity and landscape-scale multifunctionality varied from positive to negative depending on the multifunctionality metric used. In contrast, when significant, relationships between β-diversity and landscape-scale multifunctionality were always positive, because a high spatial turnover in species composition was closely related to a high spatial turnover in functions that were supported at high levels. Our findings have major implications for forest management and indicate that biotic homogenization can have previously unrecognized and negative consequences for large-scale ecosystem multifunctionality

Published
2016

13. The PHEMU15 catalogue and astrometric results of the Jupiter's Galilean satellite mutual occultation and eclipse observations made in 2014–2015

Author

Saquet, E, primary, Emelyanov, N, additional, Robert, V, additional, Arlot, J-E, additional, Anbazhagan, P, additional, Baillié, K, additional, Bardecker, J, additional, Berezhnoy, A A, additional, Bretton, M, additional, Campos, F, additional, Capannoli, L, additional, Carry, B, additional, Castet, M, additional, Charbonnier, Y, additional, Chernikov, M M, additional, Christou, A, additional, Colas, F, additional, Coliac, J-F, additional, Dangl, G, additional, Dechambre, O, additional, Delcroix, M, additional, Dias-Oliveira, A, additional, Drillaud, C, additional, Duchemin, Y, additional, Dunford, R, additional, Dupouy, P, additional, Ellington, C, additional, Fabre, P, additional, Filippov, V A, additional, Finnegan, J, additional, Foglia, S, additional, Font, D, additional, Gaillard, B, additional, Galli, G, additional, Garlitz, J, additional, Gasmi, A, additional, Gaspar, H S, additional, Gault, D, additional, Gazeas, K, additional, George, T, additional, Gorda, S Y, additional, Gorshanov, D L, additional, Gualdoni, C, additional, Guhl, K, additional, Halir, K, additional, Hanna, W, additional, Henry, X, additional, Herald, D, additional, Houdin, G, additional, Ito, Y, additional, Izmailov, I S, additional, Jacobsen, J, additional, Jones, A, additional, Kamoun, S, additional, Kardasis, E, additional, Karimov, A M, additional, Khovritchev, M Y, additional, Kulikova, A M, additional, Laborde, J, additional, Lainey, V, additional, Lavayssiere, M, additional, Le Guen, P, additional, Leroy, A, additional, Loader, B, additional, Lopez, O C, additional, Lyashenko, A Y, additional, Lyssenko, P G, additional, Machado, D I, additional, Maigurova, N, additional, Manek, J, additional, Marchini, A, additional, Midavaine, T, additional, Montier, J, additional, Morgado, B E, additional, Naumov, K N, additional, Nedelcu, A, additional, Newman, J, additional, Ohlert, J M, additional, Oksanen, A, additional, Pavlov, H, additional, Petrescu, E, additional, Pomazan, A, additional, Popescu, M, additional, Pratt, A, additional, Raskhozhev, V N, additional, Resch, J-M, additional, Robilliard, D, additional, Roschina, E, additional, Rothenberg, E, additional, Rottenborn, M, additional, Rusov, S A, additional, Saby, F, additional, Saya, L F, additional, Selvakumar, G, additional, Signoret, F, additional, Slesarenko, V Y, additional, Sokov, E N, additional, Soldateschi, J, additional, Sonka, A, additional, Soulie, G, additional, Talbot, J, additional, Tejfel, V G, additional, Thuillot, W, additional, Timerson, B, additional, Toma, R, additional, Torsellini, S, additional, Trabuco, L L, additional, Traverse, P, additional, Tsamis, V, additional, Unwin, M, additional, Abbeel, F Van Den, additional, Vandenbruaene, H, additional, Vasundhara, R, additional, Velikodsky, Y I, additional, Vienne, A, additional, Vilar, J, additional, Vugnon, J-M, additional, Wuensche, N, additional, and Zeleny, P, additional

Published
2017
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15. The PHEMU15 catalogue and astrometric results of the Jupiter’s Galilean satellite mutual occultation and eclipse observations made in 2014–2015.

Author

Saquet, E., Emelyanov, N., Robert, V., Arlot, J. -E., Anbazhagan, P., Baillié, K., Bardecker, J., Berezhnoy, A. A., Bretton, M., Campos, F., Capannoli, L., Carry, B., Castet, M., Charbonnier, Y., Chernikov, M. M., Christou, A., Colas, F., Coliac, J. -F., Dangl, G., and Dechambre, O.

Subjects
PLANETARY observations, PHOTOMETRY, GALILEAN satellites, LIGHT curves, ASTROPHYSICS
Abstract

During the 2014–2015 mutual events season, the Institut de Mécanique Céleste et de Calcul des Éphémérides (IMCCE), Paris, France, and the Sternberg Astronomical Institute (SAI), Moscow, Russia, led an international observation campaign to record ground-based photometric observations of Galilean moon mutual occultations and eclipses. We focused on processing the complete photometric observations data base to compute new accurate astrometric positions. We used our method to derive astrometric positions from the light curves of the events. We developed an accurate photometric model of mutual occultations and eclipses, while correcting for the satellite albedos, Hapke's light scattering law, the phase effect, and the limb darkening. We processed 609 light curves, and we compared the observed positions of the satellites with the theoretical positions from IMCCE NOE-5-2010-GAL satellite ephemerides and INPOP13c planetary ephemeris. The standard deviation after fitting the light curve in equatorial positions is ±24 mas, or 75 km at Jupiter. The rms (O−C) in equatorial positions is ±50 mas, or 150 km at Jupiter. [ABSTRACT FROM AUTHOR]

Published
2018
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17. A novel comparative research platform designed to determine the functional significance of tree species diversity in European forests

Author

Baeten, L., Verheyen, K., Wirth, C., Bruelheide, H., Bussotti, F., Finér, L., Jaroszewicz, B., Selvi, F., Valladares, F., Allan, E., Ampoorter, E., Auge, Harald, Avăcăriei, D., Barbaro, L., Bărnoaiea, I., Bastias, C.C., Bauhus, J., Beinhoff, C., Benavides, R., Benneter, A., Berger, S., Berthold, F., Boberg, J., Bonal, D., Brüggemann, W., Carnol, M., Castagneyrol, B., Charbonnier, Y., Chećko, E., Coomes, D., Coppi, A., Dalmaris, E., Dănilă, G., Dawud, S.M., de Vries, W., De Wandeler, H., Deconchat, M., Domisch, T., Duduman, G., Fischer, M., Fotelli, M., Gessler, A., Gimeno, T.E., Granier, A., Grossiord, C., Guyot, V., Hantsch, L., Hättenschwiler, S., Hector, A., Hermy, M., Holland, V., Jactel, H., Joly, F.-X., Jucker, T., Kolb, S., Koricheva, J., Lexer, M.J., Liebergesell, M., Milligan, H., Müller, S., Muys, B., Nguyen, D., Nichiforel, L., Pollastrini, M., Proulx, R., Rabasa, S., Radoglou, K., Ratcliffe, S., Raulund-Rasmussen, K., Seiferling, I., Stenlid, J., Vesterdal, L., von Wilpert, K., Zavala, M.A., Zielinski, D., Scherer-Lorenzen, M., Baeten, L., Verheyen, K., Wirth, C., Bruelheide, H., Bussotti, F., Finér, L., Jaroszewicz, B., Selvi, F., Valladares, F., Allan, E., Ampoorter, E., Auge, Harald, Avăcăriei, D., Barbaro, L., Bărnoaiea, I., Bastias, C.C., Bauhus, J., Beinhoff, C., Benavides, R., Benneter, A., Berger, S., Berthold, F., Boberg, J., Bonal, D., Brüggemann, W., Carnol, M., Castagneyrol, B., Charbonnier, Y., Chećko, E., Coomes, D., Coppi, A., Dalmaris, E., Dănilă, G., Dawud, S.M., de Vries, W., De Wandeler, H., Deconchat, M., Domisch, T., Duduman, G., Fischer, M., Fotelli, M., Gessler, A., Gimeno, T.E., Granier, A., Grossiord, C., Guyot, V., Hantsch, L., Hättenschwiler, S., Hector, A., Hermy, M., Holland, V., Jactel, H., Joly, F.-X., Jucker, T., Kolb, S., Koricheva, J., Lexer, M.J., Liebergesell, M., Milligan, H., Müller, S., Muys, B., Nguyen, D., Nichiforel, L., Pollastrini, M., Proulx, R., Rabasa, S., Radoglou, K., Ratcliffe, S., Raulund-Rasmussen, K., Seiferling, I., Stenlid, J., Vesterdal, L., von Wilpert, K., Zavala, M.A., Zielinski, D., and Scherer-Lorenzen, M.

Abstract

One of the current advances in functional biodiversity research is the move away from short-lived test systems towards the exploration of diversity-ecosystem functioning relationships in structurally more complex ecosystems. In forests, assumptions about the functional significance of tree species diversity have only recently produced a new generation of research on ecosystem processes and services. Novel experimental designs have now replaced traditional forestry trials, but these comparatively young experimental plots suffer from specific difficulties that are mainly related to the tree size and longevity. Tree species diversity experiments therefore need to be complemented with comparative observational studies in existing forests. Here we present the design and implementation of a new network of forest plots along tree species diversity gradients in six major European forest types: the FunDivEUROPE Exploratory Platform. Based on a review of the deficiencies of existing observational approaches and of unresolved research questions and hypotheses, we discuss the fundamental criteria that shaped the design of our platform. Key features include the extent of the species diversity gradient with mixtures up to five species, strict avoidance of a dilution gradient, special attention to community evenness and minimal covariation with other environmental factors. The new European research platform permits the most comprehensive assessment of tree species diversity effects on forest ecosystem functioning to date since it offers a common set of research plots to groups of researchers from very different disciplines and uses the same methodological approach in contrasting forest types along an extensive environmental gradient.

Published
2013

18. Observation of $\Delta^+$ $\rightarrow$ p$\pi^0$ decay in heavy-ion collisions

Author

Matulewicz, T., Aphecetche, Laurent, Charbonnier, Y., Delagrange, H., Gudima, K.K., Martinez Garcia, Gines, Ploszajczak, M., Schutz, Y., Toneev, V.D., Appenheimer, M., Averbeck, R., Diaz, J., Doeppenschmidt, A., Von Goethem, M.J., Hlavac, S., Hoefman, M., Holzmann, R., Lefevre, F., Kugler, A., Loehner, H., Marin, A., Metag, V., Novotny, R., Ostendorf, R.W., Siemssen, R.H., Simon, R.S., Stratmann, R., Stroeber, H., Tlussty, P., Vogt, P.H., Wagner, V., Weiss, J., Wilschut, H.W., Wissmann, F., Wolf, A.R., Wolf, M., Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2000

19. Deep-Subthreshold \eta and \pi Production Probing Pion Dynamics in the Reaction Ar+Ca at 180 A MeV

Author

Martinez, G., Charbonnier, Y., Aphecetche, L., Delagrange, H., Gudima, K.K., Matulewicz, T., Ploszajczak, M., Schutz, Y., Toneev, V.D., Turrisi, R., Appenheimer, M., Metag, V., Novotny, R., Ströher, H., Wolf, A.R., Wolf, M., Weiss, J., Averbeck, R., Hlavác, S., Holzmann, R., Lefèvre, F., Simon, R.S., Stratmann, R., Wissmann, F., Hoefman, M., van Goethem, M.J., Löhner, H., Ostendorf, R.W., Siemssen, R.H., Vogt, P.H., Wilschut, H.W.E.M., Díaz, J., Marín, A., Kugler, A., Tlustý, P., Wagner, V., Döppenschmidt, A., and KVI - Center for Advanced Radiation Technology

Abstract

We report on a measurement of subthreshold η and π 0 mesons in the reaction Ar + Ca at 1 8 0 A MeV. We find that the ratio of the η to π 0 meson-production cross section is more than a factor of 20 smaller than the one expected from threshold-energy scaling of meson production. In addition, the multiplicity of high m t π 0 increases faster with the centrality of the reaction than the multiplicity of the bulk of π 0 mesons. This behavior is explained by the rescattering of π mesons in nuclear matter at the origin of most energetic particles.

Published
1999

20. Deep-subthreshold n and n production probing pion dynamics in the reaction Ar+Ca at 180A MeV

Author

Martinez Garcia, Gines, Charbonnier, Y., Aphecetche, Laurent, Delagrange, H., Gudima, K.K., Matulewicz, T., Ploszajczak, M., Schutz, Y., Toneev, V., Turrisi, R., Appenheimer, M., Metag, V., Novotny, R., Stroher, H., Wolf, A.R., Wolf, M., Wei, J., Averbeck, R., Hlav, S., Holzmann, R., Lefevre, F., Simon, R.S., Stratmann, R., Wissmann, F., Hoefman, M., Van Goethem, M.J., Lhoner, H., Ostendorf, R.W., Siemssen, R.H., Vogt, P., Wilschutz, H.W., Diaz, J., Marin, A., Kugler, A., Tlusty, P., Wagner, V., Laboratoire SUBATECH Nantes (SUBATECH), and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
Published
1999

21. Seasonal variation in oceanographic habitat and behaviour of white-chinned petrels Procellaria aequinoctialis from Kerguelen Island

Author

Péron, C., Delord, K., Phillips, R.A., Charbonnier, Y., Marteau, C., Louzao, Maite, Weimerskirch, H., Péron, C., Delord, K., Phillips, R.A., Charbonnier, Y., Marteau, C., Louzao, Maite, and Weimerskirch, H.

Abstract

Marine environments experience seasonal variation in physical and biological parameters, with consequent changes in predator distributions. During the breeding period, proximity to suitable feeding sites is essential for central place foragers, whereas during the non-breeding period their distribution is relatively unconstrained. We combined light-based geolocation and satellite tracking to investigate seasonal variation in foraging grounds and behaviour of white-chinned petrels from Kerguelen Island. Birds were associated with highly productive areas throughout the year. During breeding (summer), they performed long commuting trips from the colony to distant, productive Antarctic waters. Thereafter, birds migrated 5200 km westwards to the Benguela upwelling system off Namibia and South Africa to spend the winter. This seasonal shift of foraging grounds coincides with a change in activity patterns; much less time was spent in flight in winter than in summer. Individual variability in the locations of foraging zones and seasonal/daily activity patterns was low. Trip durations were shorter during chick-rearing than incubation, although birds often travelled as far or farther, tracking the gradual break up of pack ice. Habitat use models revealed an association with distance to sea-ice edge and chlorophyll a gradient during incubation, whereas sea surface temperature and chlorophyll a gradient best explained habitat use during chick rearing. White-chinned petrels are likely to overlap with other marine predators and fisheries throughout the year. Fishery bycatch constitutes the most significant direct threat to petrels at sea. Moreover, future climate-induced reductions in productivity could affect birds year-round.

Published
2010

22. Multistep production of eta and hard pi(0) mesons in subthreshold Au-Au collisions

Author

Appenheimer, M, Averbeck, R, Charbonnier, Y, Diaz, J, Doppenschmidt, A, Hejny, [No Value], Hlavac, S, Holzmann, R, Kugler, A, Lohner, H, Marin, A, Metag, [No Value], Novotny, R, Ostendorf, RW, Pleskac, R, Schubert, A, Schutz, Y, Simon, RS, Stratmann, R, Stroher, H, Tlusty, P, Vogt, PH, Wagner, [No Value], Weiss, J, Wilschut, HW, Wissmann, F, Wolf, M, KVI - Center for Advanced Radiation Technology, and Weissing group

Subjects
TAPS, Nuclear Theory, High Energy Physics::Experiment, SPECTROMETER, PARTICLE-PRODUCTION, HEAVY-ION COLLISIONS, Nuclear Experiment, MATTER
Abstract

The neutral pi(o) and eta mesons are studied in Au-197-Au-197 collisions at an incident energy of 800A MeV, substantially below the threshold for eta production in N-N collisions. While the gross pi(o) multiplicity increases almost linearly with the number of participant nucleons, the multiplicities of eta and hard pi(o) mesons show a stronger than linear dependence. The nonlinearity is governed by the average transverse-mass excess [m(t)] - (root s - 2m(N)) of the mesons and is insensitive to their final-state interaction in the nuclear medium.

Published
1998

23. Multistep Production of $\meson$ and Hard$\pi\/^{0}$ Mesons in Subthreshold Au-Au Collisions

Author

Wolf, A.R., Appenheimer, M., Averbeck, R., Charbonnier, Y., Díaz, J., Döppenschmidt, A., Hejny, V., Hlavác, S., Holzmann, R., Kugler, A., Löhner, H., Marín, A., Metag, V., Novotny, R., Ostendorf, R.W., Pleskac, R., Schubert, A., Schutz, Y., Simon, R.S., Stratmann, R., Ströher, H., Tlustý, P., Vogt, P.H., Wagner, V., Weiss, J., Wilschut, H.W.E.M., Wissmann, F., Wolf, M., Research unit Nuclear & Hadron Physics, and KVI - Center for Advanced Radiation Technology

Published
1998

24. Multistep production of $\eta$ and hard $\pi^0$ mesons in subthreshold Au-Au collisions

Author

Wolf, A.R., Appenheimer, M., Averbeck, R., Charbonnier, Y., Daz, J., Dppenschmidt, A., Hejny, V., Hlavac, S., Holzmann, R., Kugler, A., Lhoner, H., Marn, A., Metag, V., Novotny, R., Ostendorf, R.W., Pleska, R., Schubert, A., Schutz, Y., Siemssen, R.H., Simon, R.S., Stratmann, R., Stroher, H., Tlusty, P., Vogt, P.H., Wagner, V., Wei, J., Wilschut, H.W., Wissmann, F., Wolf, M., Laboratoire SUBATECH Nantes (SUBATECH), and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Computer Science::Machine Learning, ComputingMethodologies_PATTERNRECOGNITION, Online handwriting, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Allographs, Sequence clustering, Hidden Markov Models (HMM)
Abstract

We present an unsupervised approach to cluster sequences. This method is inspired by topology learning methods for hidden Markov models, and is built upon the definition of a distance between Markov models. This type of technique may be used to learn Markovian character models from data or to identify allographs or handwriting styles.

Published
1998

25. Processus collectifs et individuels de production de particules sous le seuil. Production de pions neutres et mésons $\eta$ dans la réaction Ar+Ca a 180 A MeV

Author

Charbonnier, Y., Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Université de Caen, and Y. Schutz

Subjects
Multiplicité, Pion production, Domaine énergie 100-1000 MeV, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Etude expérimentale, Production particule, Production pion, Calcium ion, Argon ion, Heavy ion reactions, Particle production, Calcium ions, 2575D, Excitation, MeV range 100-1000, Experimental study, Résonance, Section efficace, Meson production, Réaction ion lourd, Argon ions, Cross sections, Production méson, Multiplicity, Nucleon-nucleon interactions, Interaction nucléon nucléon
Abstract

The subject of this work is the study of the collective processes and individual nucleon-nucleon collisions Involved in sub-threshold particles production. For this purpose, aad for the first time, neutral pions and etas have been simultaneously measured well below the free nucleon-nucleon threshold, in the reaction Ar+Ca at 180 A MeV. This experiment has been performed at GSI with the multidetector TAPS. The measured eta probability seems to be 20 times lower than expected from the systematics. Surprisingly, the mt scaling law appears to be still valid at so low energy. Experimental results point out that most of the observed pions are mediated by Δ resonances. Finally, the high mt pions multiplicity increases much faster than low mt pion multiplicity with the number of participants. This fact is a strong evidence of the role of collective and cooperative processes for the production of energetic particles beyond the picture of particles produced in first chance nucleon-nucleon collisions. Experimental results have been confronted to the predictions of two dynamical and one statistical models, but these models fail to provide a consistent picture of the processes involved in sub-threshold particle production.; Ce travail a pour objet l'étude des processus collectifs et de collision nucléon-nucléon individuelle dans la production de particules sous le seuil. Dans ce but, et pour la première fois, nous avons simultanément étudié les taux de production des mésons π° et η produits sous le seuil dans la réaction Ar+Ca à 180A MeV. Notre revue des données expérimentales préexistantes souligne l'intérêt spécifique de ces particules comme sonde de la matière nucléaire dense et chaude formée au cours des collisions entre ions lourds. Cette expérience a été réalisée avec le multidétecteur TAPS au GSI. Le dispositif expérimental et les techniques d'analyse utilisées nous ont permis d'obtenir les multiplicités et les sections efficaces de production de ces mésons. Il s'est avéré que la production des mésons η est 20 fois plus faibles que celle prévue par la systématique. De façon surprenante, il semble que la loi d'échelle en masse transverse soit encore valide à si faible énergie. Nous avons démontré que la plupart des pions observés interagissent avec la matière nucléaire via l'excitation des résonances Δ. Enfin, nous avons observé que la multiplicité des pions augmente avec le nombre de nucléons participants mais de façon plus marquée pour les pions de grande masse transverse que pour l'ensemble des pions. Ceci est une indication claire que le mécanisme de production des particules très énergétiques, au delà de l'image d'un superposition de collisions de première chance, implique des processus collectifs et coopératifs. Ces résultats ont été confrontés avec les prédictions de deux modèles dynamiques, et d'un modèle statistique. Ces modèles sous-estiment fortement les sections efficaces et aucun n'est en mesure de fournir une vision cohérente des processus mis en jeu.

Published
1997

26. Contribution of pi(0) and eta Dalitz decays to the dilepton invariant-mass spectrum in 1A GeV heavy-ion collisions

Author

Holzmann, R, Appenheimer, M, Averbeck, R, Charbonnier, Y, Delagrange, H, Diaz, J, Doppenschmidt, A, Hejny, [No Value], Hlavac, S, Kugler, A, Lefevre, F, Lohner, H, Marin, A, Martinez, G, Matulewicz, T, Metag, [No Value], Novotny, R, Ostendorf, RW, Pleskac, R, Schutz, Y, Siemssen, RH, Simon, RS, Stroher, H, Tlusty, P, Vogt, PH, Wagner, [No Value], Weiss, J, Wilschut, HW, Wissmann, F, Wolf, M, KVI - Center for Advanced Radiation Technology, and Weissing group

Subjects
TRANSVERSE-MOMENTUM DEPENDENCE, P-BE COLLISIONS, Nuclear Theory, High Energy Physics::Experiment, P+P COLLISIONS, SPECTROMETER, CA+CA COLLISIONS, Nuclear Experiment, DIELECTRON PRODUCTION, MESONS
Abstract

The Dalitz-decay contributions of pi(0) and eta mesons to the di-electron invariant-mass spectrum at 1A GeV have been obtained from a systematics of inclusive meson production cross sections measured for the collision systems C-12 + C-nat and Ar-40, Ca-40 + Ca-nat in the bombarding-energy range of 0.8-2.0 A GeV. These results are compared with the recently published di-electron mass spectra of the DLS collaboration. Systematic errors and angular-distribution effects are discussed. We conclude that the low-mass part of the DLS data cannot be explained by the Dalitz decays of light neutral mesons only.

Published
1997

27. Exclusive pi degrees- and eta-meson production in Ar-40+Ca-nat at 800A MeV

Author

Marin, A, Diaz, J, Averbeck, R, Hlavac, S, Holzmann, R, Lefevre, F, Schubert, A, Simon, RS, Charbonnier, Y, Martinez, G, Schutz, Y, Marques, FM, Appenheimer, M, Berg, FD, Metag, [No Value], Novotny, R, Stroher, H, Weib, J, Wolf, M, Lohner, H, Ostendorf, RW, Siemssen, RH, Vogt, P, Wilschut, HW, Kugler, A, Pleskac, R, Tlusty, P, Wagner, [No Value], Wolf, G, and Research unit Nuclear & Hadron Physics

Subjects
ENERGY, TAPS, DEPENDENCE, PIONS, Nuclear Theory, NUCLEUS-NUCLEUS COLLISIONS, EQUATION, High Energy Physics::Experiment, LIGHT FRAGMENTS, HEAVY-ION COLLISIONS, Nuclear Experiment, PHOTONS, PROBE
Abstract

The impact-parameter dependence of pi degrees- and eta-meson production is reported for the system Ar-40+Ca-nat at a beam energy of 800 A MeV. Scaling of the meson abundances with the transverse mass is observed. The experimental results are compared to calculations within the BUU model

Published
1997

28. Production of pi(0) and eta mesons in carbon-induced relativistic heavy-ion collisions

Author

Averbeck, R, Doppenschmidt, A, Appenheimer, M, Charbonnier, Y, Diaz, J, Hejny, [No Value], Hlavac, S, Holzmann, R, Kugler, A, Lefevre, F, Lohner, H, Marin, A, Metag, [No Value], Niebur, W, Ostendorf, RW, Pleskac, R, Schubert, A, Schutz, Y, Siemssen, H, Simon, RS, Stratmann, R, Stroher, H, Tlusty, P, Vogt, PH, Wagner, [No Value], Weiss, J, Wilschut, HW, Wissmann, F, Wolf, M, KVI - Center for Advanced Radiation Technology, and Weissing group

Subjects
HADRONIC MATTER, ENERGY, NUCLEUS-NUCLEUS COLLISIONS, EQUATION, High Energy Physics::Experiment, SUBTHRESHOLD ANTIPROTON, LIGHT FRAGMENTS, COMPRESSION, PARTICLE-PRODUCTION, Nuclear Experiment, PION-PRODUCTION, STATE
Abstract

The production of pi(0) and eta mesons has been investigated in the system C-12+C-12 at 0.8A GeV, 1.0A GeV, and 2.0A GeV using the TAPS photon detector. The production cross sections and transverse-momentum distributions measured around midrapidity extend the existing systematics of neutral-meson production to light systems and the highest energy available at the GSI accelerator facility. At all beam energies scaling of the differential production cross section with the transverse mass of the emitted meson is observed. In addition pi(0) production has been studied in the mass-asymmetric systems C-12+Au-197 and Au-197+C-12 at 0.8A GeV.

Published
1997

29. Contribution of $\pi^0$ and $\eta$ Dalitz decays of the dilepton invariant-mass spectrum in 1A GeV heavy-ion collisions

Author

Holzmann, R., Appenheimer, M., Averbeck, R., Charbonnier, Y., Delagrange, H., Daz, J., Dppenschmidt, A., Hejny, V., Hlavac, S., Kugler, A., Lefevre, F., Lhoner, H., Marn, A., Martinez Garcia, Gines, Matulewicz, T., Metag, V., Novotbny, R., Ostendorf, R.W., Pleska, R., Schutz, Y., Siemssen, R.H., Simon, R.S., Stroher, H., Tlust, P., Vogt, P.H., Wagner, V., Wei, J., Wilschutt, H.W., Wissmann, F., Wolf, A.R., Wolf, M., Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Bardon, Peggy, Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes)

Subjects
[PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
Published
1997

30. Contribution of $\pi^{0}$ and $\eta$ Dalitz decays to the dilepton invariant-mass spectrum in 1 A-GeV heavy-ion collisions

Author

Holzmann, R, Appenheimer, M, Averbeck, R, Charbonnier, Y, Delagrange, H, Díaz, J, Döppenschmidt, A, Hejny, V, Hlavác, S, Kugler, A, Lefèvre, F, Löhner, H, Marin, A, Martínez, G, Matulewicz, T, Metag, V, Novotny, R, Ostendorf, R W, Pleskac, R, Schutz, Y, Siemssen, R H, Simon, R S, Ströher, H, Tlustý, P, Vogt, P H, Wagner, V, Weiss, J, Wilschut, H W, Wissmann, F, Wolf, A R, and Wolf, M

Subjects
Particle Physics - Experiment
Published
1997

31. Exclusive and meson production in Ar + Ca at 800 MeV

Author

Marin, A., Diaz, J., Averbeck, R., Hlavac, S., Holzmann, R., Lefèbvres, F., Schubert, A., Simon, R.S., Charbonnier, Y., Martinez Garcia, Gines, Schutz, Y., Marqués, F.M., Appenheimer, M., Berg, F.D., Metag, V., Novotny, R., Stroher, H., Wei, J., Wolf, A.R., Wolf, M., Lhoner, H., Ostendorf, R.W., Siemssen, R.H., Vogt, P., Wilschut, H.W., Kugler, A., Pleska, P., Tlust, P., Wagner, V., Wolf, GY., Bardon, Peggy, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire SUBATECH Nantes (SUBATECH), Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes)

Subjects
[PHYS.HPHE] Physics [physics]/High Energy Physics - Phenomenology [hep-ph], [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
Published
1997

32. KANE: a simulation tool for TAPS user manual

Author

Aphecetche, Laurent, Charbonnier, Y., Martinez Garcia, Gines, Matulewicz, T., Schutz, Y., Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), GANIL, and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
1997

33. Contributions of pi^{0} and eta Dalitz Decays to the Dilepton Invariant-mass Spectrum in 1A GeV Heavy-ion Collisions

Author

Holzmann, R., Appenheimer, M., Averbeck, R., Charbonnier, Y., Delagrange, H., Díaz, J., Döppenschmidt, A., Hejny, V., Hlavác, S., Kugler, A., Lefèvre, F., Löhner, H., Marín, A., Martínez, G., Matulewicz, T., Metag, V., Novotny, R., Ostendorf, R.W., Pleskac, R., Schutz, Y., Siemssen, R.H., Simon, R.S., Ströher, H., Tlustý, P., Vogt, P.H., Wagner, V., Weiss, J., Wilschut, H.W.E.M., Wissmann, F., Wolf, A.R., Wolf, M., Research unit Nuclear & Hadron Physics, and KVI - Center for Advanced Radiation Technology

Abstract

The Dalitz-decay contributions of π 0 and η mesons to the di-electron invariant-mass spectrum at 1 A GeV have been obtained from a systematics of inclusive meson production cross sections measured for the collision systems 12 C + nat C and 40 Ar , 40 Ca + nat Ca in the bombarding-energy range of 0.8–2.0 A GeV. These results are compared with the recently published di-electron mass spectra of the DLS collaboration. Systematic errors and angular-distribution effects are discussed. We conclude that the low-mass part of the DLS data cannot be explained by the Dalitz decays of light neutral mesons only.

Published
1997

34. Exclusive $\pi^0$- and $\eta$-meson production in $^{40}$Ar +$^{nat}$Ca at 800A MeV

Author

Marin, A., Diaz, J., Averbeck, R., Hlavac, S., Holzmann, R., Lefevre, F., Schubert, A., Simon, R.S., Charbonnier, Y., Martinez Garcia, Gines, Schutz, Y., Marqués, F.M., Appenheimer, M., Berg, F.D., Metag, V., Novotny, R., Stroher, H., Weiss, J., Wolf, A.R., Wolf, M., Lohner, H., Ostendorf, R.W., Siemssen, R.H., Vogt, P., Wilshut, H.W., Kugler, A., Pleskac, R., Tlusty, P., Wagner, V., Wolf, Gy., Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
1997

35. Collective and individual processes of sub-threshold particles production. Pions neutral and η mesons production in the Ar+Ca 180 A MeV reaction

Author

Charbonnier, Y. and Lion, Michel

Subjects
Experimental study, Résonance, Multiplicité, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Section efficace, Meson production, Pion production, Réaction ion lourd, Domaine énergie 100-1000 MeV, Argon ions, Cross sections, Production méson, Etude expérimentale, Multiplicity, Production particule, Production pion, Calcium ion, Nucleon-nucleon interactions, Argon ion, Heavy ion reactions, Particle production, Calcium ions, Interaction nucléon nucléon, Excitation, MeV range 100-1000
Abstract

The subject of this work is the study of the collective processes and individual nucleon-nucleon collisions Involved in sub-threshold particles production. For this purpose, aad for the first time, neutral pions and etas have been simultaneously measured well below the free nucleon-nucleon threshold, in the reaction Ar+Ca at 180 A MeV. This experiment has been performed at GSI with the multidetector TAPS. The measured eta probability seems to be 20 times lower than expected from the systematics. Surprisingly, the mt scaling law appears to be still valid at so low energy. Experimental results point out that most of the observed pions are mediated by Δ resonances. Finally, the high mt pions multiplicity increases much faster than low mt pion multiplicity with the number of participants. This fact is a strong evidence of the role of collective and cooperative processes for the production of energetic particles beyond the picture of particles produced in first chance nucleon-nucleon collisions. Experimental results have been confronted to the predictions of two dynamical and one statistical models, but these models fail to provide a consistent picture of the processes involved in sub-threshold particle production., Ce travail a pour objet l'étude des processus collectifs et de collision nucléon-nucléon individuelle dans la production de particules sous le seuil. Dans ce but, et pour la première fois, nous avons simultanément étudié les taux de production des mésons π° et η produits sous le seuil dans la réaction Ar+Ca à 180A MeV. Notre revue des données expérimentales préexistantes souligne l'intérêt spécifique de ces particules comme sonde de la matière nucléaire dense et chaude formée au cours des collisions entre ions lourds. Cette expérience a été réalisée avec le multidétecteur TAPS au GSI. Le dispositif expérimental et les techniques d'analyse utilisées nous ont permis d'obtenir les multiplicités et les sections efficaces de production de ces mésons. Il s'est avéré que la production des mésons η est 20 fois plus faibles que celle prévue par la systématique. De façon surprenante, il semble que la loi d'échelle en masse transverse soit encore valide à si faible énergie. Nous avons démontré que la plupart des pions observés interagissent avec la matière nucléaire via l'excitation des résonances Δ. Enfin, nous avons observé que la multiplicité des pions augmente avec le nombre de nucléons participants mais de façon plus marquée pour les pions de grande masse transverse que pour l'ensemble des pions. Ceci est une indication claire que le mécanisme de production des particules très énergétiques, au delà de l'image d'un superposition de collisions de première chance, implique des processus collectifs et coopératifs. Ces résultats ont été confrontés avec les prédictions de deux modèles dynamiques, et d'un modèle statistique. Ces modèles sous-estiment fortement les sections efficaces et aucun n'est en mesure de fournir une vision cohérente des processus mis en jeu.

Published
1997

38. Deep-Subthresholdηandπ0Production Probing Pion Dynamics in the ReactionAr+Caat180AMeV

Author

Martínez, G., primary, Charbonnier, Y., additional, Aphecetche, L., additional, Delagrange, H., additional, Gudima, K. K., additional, Matulewicz, T., additional, Ploszajczak, M., additional, Schutz, Y., additional, Toneev, V., additional, Turrisi, R., additional, Appenheimer, M., additional, Metag, V., additional, Novotny, R., additional, Ströher, H., additional, Wolf, A. R., additional, Wolf, M., additional, Weiß, J., additional, Averbeck, R., additional, Hlaváč, S., additional, Holzmann, R., additional, Lefèvre, F., additional, Simon, R. S., additional, Stratmann, R., additional, Wissmann, F., additional, Hoefman, M., additional, van Goethem, M. J., additional, Löhner, H., additional, Ostendorf, R. W., additional, Siemssen, R. H., additional, Vogt, P., additional, Wilschut, H. W., additional, Díaz, J., additional, Marín, A., additional, Kugler, A., additional, Tlusty, P., additional, Wagner, V., additional, and Döppenschmidt, A., additional

Published
1999
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39. Detection of charged pions and protons in the segmented electromagnetic calorimeter TAPS

Author

Marı́n, A., primary, Dı́az, J., additional, Averbeck, R., additional, Döppenschmidt, A., additional, Hlaváč, S., additional, Holzmann, R., additional, Lefèvre, F., additional, Schubert, A., additional, Simon, R.S., additional, Charbonnier, Y., additional, Martı́nez, G., additional, Schutz, Y., additional, Marqués, F.M., additional, Appenheimer, M., additional, Berg, F.D., additional, Metag, V., additional, Novotny, R., additional, Ströher, H., additional, Weiß, J., additional, Wolf, A.R., additional, Wolf, M., additional, Löhner, H., additional, Ostendorf, R.W., additional, Vogt, P., additional, Wilschut, H.W., additional, Kugler, A., additional, Pleskač, R., additional, Tlustý, P., additional, and Wagner, V., additional

Published
1998
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40. Multistep Production ofηand Hardπ0Mesons in Subthreshold Au-Au Collisions

Author

Wolf, A. R., primary, Appenheimer, M., additional, Averbeck, R., additional, Charbonnier, Y., additional, Díaz, J., additional, Döppenschmidt, A., additional, Hejny, V., additional, Hlaváč, S., additional, Holzmann, R., additional, Kugler, A., additional, Löhner, H., additional, Marín, A., additional, Metag, V., additional, Novotny, R., additional, Ostendorf, R. W., additional, Pleskač, R., additional, Schubert, A., additional, Schutz, Y., additional, Simon, R. S., additional, Stratmann, R., additional, Ströher, H., additional, Tlustý, P., additional, Vogt, P. H., additional, Wagner, V., additional, Weiß, J., additional, Wilschut, H. W., additional, Wissmann, F., additional, and Wolf, M., additional

Published
1998
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41. Contribution ofπ0and η Dalitz decays to the dilepton invariant-mass spectrum in1AGeV heavy-ion collisions

Author

Holzmann, R., primary, Appenheimer, M., additional, Averbeck, R., additional, Charbonnier, Y., additional, Delagrange, H., additional, Díaz, J., additional, Döppenschmidt, A., additional, Hejny, V., additional, Hlaváč, S., additional, Kugler, A., additional, Lefèvre, F., additional, Löhner, H., additional, Marin, A., additional, Martínez, G., additional, Matulewicz, T., additional, Metag, V., additional, Novotny, R., additional, Ostendorf, R. W., additional, Pleskaĉ, R., additional, Schutz, Y., additional, Siemssen, R. H., additional, Simon, R. S., additional, Ströher, H., additional, Tlustý, P., additional, Vogt, P. H., additional, Wagner, V., additional, Weiß, J., additional, Wilschut, H. W., additional, Wissmann, F., additional, Wolf, A. R., additional, and Wolf, M., additional

Published
1997
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42. Exclusive πo- and η-meson production in 40Ar + natCa at 800A MeV

Author

Marín, A., primary, Díaz, J., additional, Averbeck, R., additional, Hlaváč, S., additional, Holzmann, R., additional, Lefèvre, F., additional, Schubert, A., additional, Simon, R.S., additional, Charbonnier, Y., additional, Martínez, G., additional, Schutz, Y., additional, Marqués, F.M., additional, Appenheimer, M., additional, Berg, F.D., additional, Metag, V., additional, Novotny, R., additional, Ströher, H., additional, Weiß, J., additional, Wolf, A.R., additional, Wolf, M., additional, Löhner, H., additional, Ostendorf, R.W., additional, Siemssen, R.H., additional, Vogt, P., additional, Wilschut, H.W., additional, Kugler, A., additional, Pleskač, R., additional, Tlustý, P., additional, Wagner, V., additional, and Wolf, Gy., additional

Published
1997
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44. Experimental Study of Pionic Flow in Relativistic Heavy Ion Collisions

Author

Kugler, A., primary, Tlustý, P., additional, Wagner, V., additional, Pleskač, R., additional, Taranenko, A., additional, Hlaváč, S., additional, Averbeck, R., additional, Döppenschmidt, A., additional, Holzmann, R., additional, Metag, V., additional, Simon, R. S., additional, Stratmann, R., additional, Wissman, F., additional, Charbonnier, Y., additional, Marqués, M., additional, Martínez, G., additional, Schutz, Y., additional, Löhner, H., additional, Ostendorf, R., additional, Siemssen, R. H., additional, Vogt, P., additional, Wilschut, H. W., additional, Appenheimer, M., additional, Franke, M., additional, Gabler, A. R., additional, Weiss, J., additional, Novotny, R., additional, Röbig-Landau, M., additional, Ströher, H., additional, Wolf, M., additional, Díaz, J., additional, and Marín, A., additional

Published
1996
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46. Observation of Δ+→ pπ0 decay in heavy-ion collisions.

Author

Matulewicz, T., Aphecetche, L., Charbonnier, Y., Delagrange, H., Gudima, K.K., Martınez, G., Płoszajczak, M., Schutz, Y., Toneev, V.D., Appenheimer, M., Averbeck, R., Dıaz, J., Döppenschmidt, A., van Goethem, M.J., Hlavač, S., Hoefman, M., Holzmann, R., Lefèvre, F., Kugler, A., and Löhner, H.

Abstract

Proton-π0 coincidences have been measured at the beam energy of 180 A MeV in the reaction Ar+Ca studied by TAPS at SIS/GSI. In the proton-π0 invariant mass spectrum we observe a significant excess of strength above the background obtained by event mixing. We attribute this signal to the strength distribution NΔ of the Δ baryonic resonance. No correlation is observed in the case of deuteron-π0 coincidences. Assuming isotropic emission of π0 and Δ+ from a midrapidity thermal source and isospin symmetry, we determined the global NΔ/ Nπratio of 0.79 ±0.30(stat) ±0.2(syst). This value indicates that most pions produced at subthreshold energy in heavy-ion reaction are mediated by the Δ-resonance. [ABSTRACT FROM AUTHOR]

Published
2000
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48. Exclusive πo- and η-meson production in 40Ar + natCa at 800 A MeV

Author

Marín, A., Díaz, J., Averbeck, R., Hlaváč, S., Holzmann, R., Lefèvre, F., Schubert, A., Simon, R.S., Charbonnier, Y., Martínez, G., Schutz, Y., Marqués, F.M., Appenheimer, M., Berg, F.D., Metag, V., Novotny, R., Ströher, H., Weiß, J., Wolf, A.R., Wolf, M., Löhner, H., Ostendorf, R.W., Siemssen, R.H., Vogt, P., Wilschut, H.W., Kugler, A., Pleskač, R., Tlustý, P., Wagner, V., and Wolf, Gy.

Published
1997
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50. Biotic predictors complement models of bat and bird responses to climate and tree diversity in European forests.

Author

Barbaro L, Allan E, Ampoorter E, Castagneyrol B, Charbonnier Y, De Wandeler H, Kerbiriou C, Milligan HT, Vialatte A, Carnol M, Deconchat M, De Smedt P, Jactel H, Koricheva J, Le Viol I, Muys B, Scherer-Lorenzen M, Verheyen K, and van der Plas F

Subjects
Animals, Environment, Europe, Models, Biological, Biodiversity, Birds, Chiroptera, Forests
Abstract

Bats and birds are key providers of ecosystem services in forests. How climate and habitat jointly shape their communities is well studied, but whether biotic predictors from other trophic levels may improve bird and bat diversity models is less known, especially across large bioclimatic gradients. Here, we achieved multi-taxa surveys in 209 mature forests replicated in six European countries from Spain to Finland, to investigate the importance of biotic predictors (i.e. the abundance or activity of defoliating insects, spiders, earthworms and wild ungulates) for bat and bird taxonomic and functional diversity. We found that nine out of 12 bird and bat diversity metrics were best explained when biotic factors were added to models including climate and habitat variables, with a mean gain in explained variance of 38% for birds and 15% for bats. Tree functional diversity was the most important habitat predictor for birds, while bats responded more to understorey structure. The best biotic predictors for birds were spider abundance and defoliating insect activity, while only bat functional evenness responded positively to insect herbivory. Accounting for potential biotic interactions between bats, birds and other taxa of lower trophic levels will help to understand how environmental changes along large biogeographical gradients affect higher-level predator diversity in forest ecosystems.

Published
2019
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