77 resultados para REGIME SHIFTS
Filtro por publicador
- Aberystwyth University Repository - Reino Unido (1)
- Academic Archive On-line (Stockholm University; Sweden) (1)
- Acceda, el repositorio institucional de la Universidad de Las Palmas de Gran Canaria. España (3)
- AMS Tesi di Dottorato - Alm@DL - Università di Bologna (8)
- AMS Tesi di Laurea - Alm@DL - Università di Bologna (16)
- Aquatic Commons (29)
- ArchiMeD - Elektronische Publikationen der Universität Mainz - Alemanha (5)
- Archimer: Archive de l'Institut francais de recherche pour l'exploitation de la mer (1)
- Archive of European Integration (16)
- Archivo Digital para la Docencia y la Investigación - Repositorio Institucional de la Universidad del País Vasco (3)
- Aston University Research Archive (1)
- Avian Conservation and Ecology - Eletronic Cientific Hournal - Écologie et conservation des oiseaux: (1)
- Biblioteca Digital da Câmara dos Deputados (19)
- Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (19)
- Biblioteca Digital da Produção Intelectual da Universidade de São Paulo (BDPI/USP) (8)
- Biblioteca Digital de Teses e Dissertações Eletrônicas da UERJ (8)
- BORIS: Bern Open Repository and Information System - Berna - Suiça (45)
- Boston University Digital Common (2)
- Brock University, Canada (5)
- Bucknell University Digital Commons - Pensilvania - USA (4)
- CaltechTHESIS (3)
- Cambridge University Engineering Department Publications Database (45)
- CentAUR: Central Archive University of Reading - UK (66)
- Central European University - Research Support Scheme (2)
- Chinese Academy of Sciences Institutional Repositories Grid Portal (61)
- CiencIPCA - Instituto Politécnico do Cávado e do Ave, Portugal (1)
- Clark Digital Commons--knowledge; creativity; research; and innovation of Clark University (1)
- Cochin University of Science & Technology (CUSAT), India (5)
- Comissão Econômica para a América Latina e o Caribe (CEPAL) (17)
- CORA - Cork Open Research Archive - University College Cork - Ireland (1)
- Corvinus Research Archive - The institutional repository for the Corvinus University of Budapest (1)
- Dalarna University College Electronic Archive (3)
- Deakin Research Online - Australia (53)
- DI-fusion - The institutional repository of Université Libre de Bruxelles (1)
- Digital Commons - Michigan Tech (3)
- Digital Peer Publishing (3)
- DigitalCommons - The University of Maine Research (1)
- DigitalCommons@The Texas Medical Center (1)
- DigitalCommons@University of Nebraska - Lincoln (1)
- Diposit Digital de la UB - Universidade de Barcelona (6)
- Duke University (3)
- eResearch Archive - Queensland Department of Agriculture; Fisheries and Forestry (1)
- Gallica, Bibliotheque Numerique - Bibliothèque nationale de France (French National Library) (BnF), France (1)
- Greenwich Academic Literature Archive - UK (1)
- Helda - Digital Repository of University of Helsinki (6)
- Indian Institute of Science - Bangalore - Índia (36)
- Instituto Politécnico do Porto, Portugal (24)
- Lume - Repositório Digital da Universidade Federal do Rio Grande do Sul (12)
- Memoria Académica - FaHCE, UNLP - Argentina (9)
- Ministerio de Cultura, Spain (1)
- Plymouth Marine Science Electronic Archive (PlyMSEA) (47)
- Portal de Revistas Científicas Complutenses - Espanha (1)
- Publishing Network for Geoscientific & Environmental Data (10)
- QUB Research Portal - Research Directory and Institutional Repository for Queen's University Belfast (77)
- Queensland University of Technology - ePrints Archive (65)
- RDBU - Repositório Digital da Biblioteca da Unisinos (4)
- ReCiL - Repositório Científico Lusófona - Grupo Lusófona, Portugal (8)
- Repositório Científico da Universidade de Évora - Portugal (1)
- Repositório digital da Fundação Getúlio Vargas - FGV (60)
- Repositório Digital da Universidade Municipal de São Caetano do Sul - USCS (1)
- Repositório Institucional da Universidade de Aveiro - Portugal (1)
- Repositório Institucional UNESP - Universidade Estadual Paulista "Julio de Mesquita Filho" (95)
- RUN (Repositório da Universidade Nova de Lisboa) - FCT (Faculdade de Cienecias e Technologia), Universidade Nova de Lisboa (UNL), Portugal (10)
- SAPIENTIA - Universidade do Algarve - Portugal (5)
- School of Medicine, Washington University, United States (1)
- Universidad del Rosario, Colombia (2)
- Universidade de Lisboa - Repositório Aberto (4)
- Universidade Federal do Pará (5)
- Universidade Federal do Rio Grande do Norte (UFRN) (14)
- Universitat de Girona, Spain (1)
- Universitätsbibliothek Kassel, Universität Kassel, Germany (6)
- Université de Lausanne, Switzerland (3)
- Université de Montréal, Canada (4)
- University of Connecticut - USA (1)
- University of Queensland eSpace - Australia (1)
- University of Washington (1)
Resumo:
Spectrally-peaked proton beams of high charge (Ep ≈ 8 MeV, ΔE ≈ 4 MeV, N ≈ 50 nC ) have been observed from the interaction of an intense laser (>1019Wcm-2) with ultrathinCHfoils, as measured by spectrally-resolved full beam profiles. These beams are reproducibly generated for foil thicknesses 5-100 nm, and exhibit narrowing divergence with decreasing target thickness down to ≈8° for 5 nm. Simulations demonstrate that the narrow energy spread feature is a result of buffered acceleration of protons. The radiation pressure at the front of the target results in asymmetric sheath fields which permeate throughout the target, causing preferential forward acceleration. Due to their higher chargeto-mass ratio, the protons outrun a carbon plasma driven in the relativistic transparency regime.