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The measurement of the production of deuterons, tritons and 3He and their antiparticles in Pb-Pb collisions at √sNN = 5.02 TeV is presented in this article. The measurements are carried out at midrapidity (y|< 0.5) as a function of collision centrality using the ALICE detector. The pT-integrated yields, the coalescence parameters and the ratios to protons and antiprotons are reported and compared with nucleosynthesis models. The comparison of these results in different collision systems at different center-of-mass collision energies reveals a suppression of nucleus production in small systems. In the Statistical Hadronisation Model framework, this can be explained by a small correlation volume where the baryon number is conserved, as already shown in previous fluctuation analyses. However, a different size of the correlation volume is required to describe the proton yields in the same data sets. The coalescence model can describe this suppression by the fact that the wave functions of the nuclei are large and the fireball size starts to become comparable and even much smaller than the actual nucleus at low multiplicities.
Four new species of Chrysina Kirby (Coleoptera: Scarabaeidae: Rutelinae) from Guatemala and Honduras
(2017)
Four new species of the genus Chrysina Kirby (Coleoptera: Scarabaeidae: Rutelinae) are described from cloud forests of Guatemala and Honduras. The Guatemalan species are C. alexae n. sp. from Purulhá, Baja Verapáz in the central mountains and C. woodruffi n. sp. from Bulej, Huehuetenango in Los Cuchumatanes Mountains at elevations from 1500 to 2000 meters. The species from Honduras are C. antonkozlovi n. sp. from Celaque, Lempira and C. maishei n. sp. from El Güisayote, Ocotepeque, at elevations between 2000 and 2600 meters above sea level.
Three species of bees (Hymenoptera: Apidae, Colletidae) are newly recorded for Guatemala: Centris obscurior Michener, Centris vidua Mocsáry, and Zikanapis inbio (Michener, Engel and Ayala). We discuss aspects of their biology and circumstances of the collecting events and provide information on their presently known distribution.
ZooBank registration. urn:lsid:zoobank.org:pub:A19C3260-B215-4F61-AF9C-72D88DD06456
A new species of Chrysina Kirby, C. clavellina Monzón, Blackaller, and Hawks (Coleoptera: Scarabaeidae: Rutelinae: Rutelini) is described from Santiago Clavellinas in the Sierra Azul in Oaxaca, Mexico. Chrysina cosijoezai (Ramírez-Ponce and Curoe) is placed as a junior synonym of C. lacordairei (Boucard), and notes on the Chrysina fauna of this mountain range are included.
A new species of the genus Onychopygia Beier, 1962 Orthoptera: Tettigoniidae: Pseudophyllinae) from the northern slopes of Los Cuchumatanes Mountains, Huehuetenango, Guatemala is described and illustrated. The morphological differences and peculiarities between O. panamensis Beier, 1962 and O. brachyptera n. sp. are discussed. The finding of this new taxon extends considerably into entral America our previous knowledge on the distribution of the Eucocconotini tribe. Finally we provide a revised taxonomic key to the Eucocconotini tribe.