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(URI)</option><option value="author_id">arXiv author ID</option><option value="help">Help pages</option><option value="full_text">Full text</option></select> <input id="query" name="query" type="text" value="Niemela, J"> <ul id="abstracts"><li><input checked id="abstracts-0" name="abstracts" type="radio" value="show"> <label for="abstracts-0">Show abstracts</label></li><li><input id="abstracts-1" name="abstracts" type="radio" value="hide"> <label for="abstracts-1">Hide abstracts</label></li></ul> </div> <div class="box field is-grouped is-grouped-multiline level-item"> <div class="control"> <span class="select is-small"> <select id="size" name="size"><option value="25">25</option><option selected value="50">50</option><option value="100">100</option><option value="200">200</option></select> </span> <label for="size">results per page</label>. </div> <div class="control"> <label for="order">Sort results by</label> <span class="select is-small"> <select id="order" name="order"><option selected value="-announced_date_first">Announcement date (newest first)</option><option value="announced_date_first">Announcement date (oldest first)</option><option value="-submitted_date">Submission date (newest first)</option><option value="submitted_date">Submission date (oldest first)</option><option value="">Relevance</option></select> </span> </div> <div class="control"> <button class="button is-small is-link">Go</button> </div> </div> </form> </div> </div> <ol class="breathe-horizontal" start="1"> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2403.05145">arXiv:2403.05145</a> <span> [<a href="https://arxiv.org/pdf/2403.05145">pdf</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1080/10619127.2023.2198913">10.1080/10619127.2023.2198913 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Investigating the Proton Structure: The FAMU experiment </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Vacchi%2C+A">A. Vacchi</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Baruzzo%2C+M">M. Baruzzo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Cabrera%2C+H">H. Cabrera</a>, <a href="/search/physics?searchtype=author&query=Carsi%2C+S">S. Carsi</a>, <a href="/search/physics?searchtype=author&query=Cirrincione%2C+D">D. Cirrincione</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">F. Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Vecchi%2C+C">C. De Vecchi</a>, <a href="/search/physics?searchtype=author&query=De+Vincenzi%2C+M">M. De Vincenzi</a>, <a href="/search/physics?searchtype=author&query=Fasci%2C+E">E. Fasci</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Gianfrani%2C+L">L. Gianfrani</a>, <a href="/search/physics?searchtype=author&query=Hillier%2C+A+D">A. D. Hillier</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a>, <a href="/search/physics?searchtype=author&query=King%2C+P+J+C">P. J. C. King</a> , et al. (24 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2403.05145v1-abstract-short" style="display: inline;"> The article gives the motivations for the measurement of the hyperfine splitting (hfs) in the ground state of muonic hydrogen to explore the properties of the proton at low momentum transfer. It summarizes these proposed measurement methods and finally describes the FAMU experiment in more detail. </span> <span class="abstract-full has-text-grey-dark mathjax" id="2403.05145v1-abstract-full" style="display: none;"> The article gives the motivations for the measurement of the hyperfine splitting (hfs) in the ground state of muonic hydrogen to explore the properties of the proton at low momentum transfer. It summarizes these proposed measurement methods and finally describes the FAMU experiment in more detail. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2403.05145v1-abstract-full').style.display = 'none'; document.getElementById('2403.05145v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 March, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2024. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Nuclear Physics News 33:4, 9-16, 2023 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2401.14808">arXiv:2401.14808</a> <span> [<a href="https://arxiv.org/pdf/2401.14808">pdf</a>, <a href="https://arxiv.org/format/2401.14808">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Computational Physics">physics.comp-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Biological Physics">physics.bio-ph</span> </div> </div> <p class="title is-5 mathjax"> Raman spectra of amino acids and peptides from machine learning polarizabilities </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Berger%2C+E">Ethan Berger</a>, <a href="/search/physics?searchtype=author&query=Niemel%C3%A4%2C+J">Juha Niemel盲</a>, <a href="/search/physics?searchtype=author&query=Lampela%2C+O">Outi Lampela</a>, <a href="/search/physics?searchtype=author&query=Juffer%2C+A+H">Andr茅 H. Juffer</a>, <a href="/search/physics?searchtype=author&query=Komsa%2C+H">Hannu-Pekka Komsa</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2401.14808v2-abstract-short" style="display: inline;"> Raman spectroscopy is an important tool in the study of vibrational properties and composition of molecules, peptides and even proteins. Raman spectra can be simulated based on the change of the electronic polarizability with vibrations, which can nowadays be efficiently obtained via machine learning models trained on first-principles data. However, the transferability of the models trained on sma… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.14808v2-abstract-full').style.display = 'inline'; document.getElementById('2401.14808v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2401.14808v2-abstract-full" style="display: none;"> Raman spectroscopy is an important tool in the study of vibrational properties and composition of molecules, peptides and even proteins. Raman spectra can be simulated based on the change of the electronic polarizability with vibrations, which can nowadays be efficiently obtained via machine learning models trained on first-principles data. However, the transferability of the models trained on small molecules to larger structures is unclear and direct training on large structures in prohibitively expensive. In this work, we first train two machine learning models to predict polarizabilities of all 20 amino acids. Both models are carefully benchmarked and compared to DFT calculations, with neural network method found to offer better transferability. By combining machine learning models with classical force field molecular dynamics, Raman spectra of all amino acids are also obtained and investigated, showing good agreement with experiments. The models are further extended to small peptides. We find that adding structures containing peptide bonds to the training set greatly improves predictions even for peptides not included in training sets. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2401.14808v2-abstract-full').style.display = 'none'; document.getElementById('2401.14808v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 29 April, 2024; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 26 January, 2024; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2024. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2312.04987">arXiv:2312.04987</a> <span> [<a href="https://arxiv.org/pdf/2312.04987">pdf</a>, <a href="https://arxiv.org/format/2312.04987">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="High Energy Physics - Experiment">hep-ex</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/19/02/C02034">10.1088/1748-0221/19/02/C02034 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Status of the detector setup for the FAMU experiment at RIKEN-RAL for a precision measurement of the Zemach radius of the proton in muonic hydrogen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Rossini%2C+R">R. Rossini</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Banfi%2C+S">S. Banfi</a>, <a href="/search/physics?searchtype=author&query=Baruzzo%2C+M">M. Baruzzo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">V. Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Cabrera%2C+H">H. Cabrera</a>, <a href="/search/physics?searchtype=author&query=Carsi%2C+S">S. Carsi</a>, <a href="/search/physics?searchtype=author&query=Cirrincione%2C+D">D. Cirrincione</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M+B">M. B. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=de+Vecchi%2C+C">C. de Vecchi</a>, <a href="/search/physics?searchtype=author&query=Fasci%2C+E">E. Fasci</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Gaigher%2C+R">R. Gaigher</a>, <a href="/search/physics?searchtype=author&query=Gianfrani%2C+L">L. Gianfrani</a>, <a href="/search/physics?searchtype=author&query=Hillier%2C+A+D">A. D. Hillier</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a> , et al. (24 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2312.04987v1-abstract-short" style="display: inline;"> The FAMU experiment at RIKEN-RAL is a muonic atom experiment with the aim to determine the Zemach radius of the proton by measuring the 1s hyperfine splitting in muonic hydrogen. The activity of the FAMU Collaboration in the years 2015-2023 enabled the final optimisation of the detector-target setup as well as the gas working condition in terms of temperature, pressure and gas mixture composition.… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.04987v1-abstract-full').style.display = 'inline'; document.getElementById('2312.04987v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2312.04987v1-abstract-full" style="display: none;"> The FAMU experiment at RIKEN-RAL is a muonic atom experiment with the aim to determine the Zemach radius of the proton by measuring the 1s hyperfine splitting in muonic hydrogen. The activity of the FAMU Collaboration in the years 2015-2023 enabled the final optimisation of the detector-target setup as well as the gas working condition in terms of temperature, pressure and gas mixture composition. The experiment has started its data taking in July 2023. The status of the detector setup for the 2023 experimental runs, for the beam characterisation and muonic X-ray detection in the 100-200 keV energy range, is presented and discussed. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2312.04987v1-abstract-full').style.display = 'none'; document.getElementById('2312.04987v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 December, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> December 2023. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Submitted to JINST</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2303.05608">arXiv:2303.05608</a> <span> [<a href="https://arxiv.org/pdf/2303.05608">pdf</a>, <a href="https://arxiv.org/format/2303.05608">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Statistical Mechanics">cond-mat.stat-mech</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Geophysics">physics.geo-ph</span> </div> </div> <p class="title is-5 mathjax"> Turbulent convection at very high Rayleigh numbers and the weakly nonlinear theory </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Sreenivasan%2C+K+R">Katepalli R. Sreenivasan</a>, <a href="/search/physics?searchtype=author&query=Niemela%2C+J+J">Joseph J. Niemela</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2303.05608v1-abstract-short" style="display: inline;"> To provide insights into the challenging problem of turbulent convection, Jack Herring used a greatly truncated version of the complete Boussinesq equations containing only one horizontal wavenumber. In light of later observations of a robust large scale circulation sweeping through convecting enclosures at high Rayleigh numbers, it is perhaps not an implausible point of view from which to reexami… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.05608v1-abstract-full').style.display = 'inline'; document.getElementById('2303.05608v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2303.05608v1-abstract-full" style="display: none;"> To provide insights into the challenging problem of turbulent convection, Jack Herring used a greatly truncated version of the complete Boussinesq equations containing only one horizontal wavenumber. In light of later observations of a robust large scale circulation sweeping through convecting enclosures at high Rayleigh numbers, it is perhaps not an implausible point of view from which to reexamine high-Rayleigh-number data. Here we compare past experimental data on convective heat transport at high Rayleigh numbers with predictions from Herring's model and, in fact, find excellent agreement. The model has only one unknown parameter compared to the two free parameters present in the lowest order least-squares power-law fit. We discuss why the underlying simplistic physical picture, meant to work at Rayleigh numbers slightly past the critical value of a few thousands, is consistent with the data, when the single free parameter in it is revised, over some eleven decades of the Rayleigh number -- stretching from about a million to about $10^{17}$. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2303.05608v1-abstract-full').style.display = 'none'; document.getElementById('2303.05608v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 9 March, 2023; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> March 2023. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/2105.06701">arXiv:2105.06701</a> <span> [<a href="https://arxiv.org/pdf/2105.06701">pdf</a>, <a href="https://arxiv.org/format/2105.06701">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physleta.2021.127401">10.1016/j.physleta.2021.127401 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Measurement of the muon transfer rate from muonic hydrogen to oxygen in the range 70-336 K </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Pizzolotto%2C+C">C. Pizzolotto</a>, <a href="/search/physics?searchtype=author&query=Sbrizzi%2C+A">A. Sbrizzi</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Baruzzo%2C+M">M. Baruzzo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Cabrera%2C+H">H. Cabrera</a>, <a href="/search/physics?searchtype=author&query=Cirrincione%2C+D">D. Cirrincione</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Vecchio%2C+C">C. De Vecchio</a>, <a href="/search/physics?searchtype=author&query=De+Vincenzi%2C+M">M. De Vincenzi</a>, <a href="/search/physics?searchtype=author&query=Fasci%2C+E">E. Fasci</a>, <a href="/search/physics?searchtype=author&query=Fuschino%2C+F">F. Fuschino</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Gianfrani%2C+L">L. Gianfrani</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a>, <a href="/search/physics?searchtype=author&query=Labanti%2C+C">C. Labanti</a>, <a href="/search/physics?searchtype=author&query=Maggi%2C+V">V. Maggi</a> , et al. (17 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="2105.06701v1-abstract-short" style="display: inline;"> The first measurement of the temperature dependence of the muon transfer rate from muonic hydrogen to oxygen was performed by the FAMU collaboration in 2016. The results provide evidence that the transfer rate rises with the temperature in the range 104-300 K. This paper presents the results of the experiment done in 2018 to extend the measurements towards lower (70 K) and higher (336 K) temperatu… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.06701v1-abstract-full').style.display = 'inline'; document.getElementById('2105.06701v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="2105.06701v1-abstract-full" style="display: none;"> The first measurement of the temperature dependence of the muon transfer rate from muonic hydrogen to oxygen was performed by the FAMU collaboration in 2016. The results provide evidence that the transfer rate rises with the temperature in the range 104-300 K. This paper presents the results of the experiment done in 2018 to extend the measurements towards lower (70 K) and higher (336 K) temperatures. The 2018 results confirm the temperature dependence of the muon transfer rate observed in 2016 and sets firm ground for comparison with the theoretical predictions. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('2105.06701v1-abstract-full').style.display = 'none'; document.getElementById('2105.06701v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 May, 2021; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2021. </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1905.02049">arXiv:1905.02049</a> <span> [<a href="https://arxiv.org/pdf/1905.02049">pdf</a>, <a href="https://arxiv.org/ps/1905.02049">ps</a>, <a href="https://arxiv.org/format/1905.02049">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1016/j.physleta.2020.126667">10.1016/j.physleta.2020.126667 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> First measurement of the temperature dependence of muon transfer rate from muonic hydrogen atoms to oxygen </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=FAMU+Collaboration"> FAMU Collaboration</a>, <a href="/search/physics?searchtype=author&query=Mocchiutti%2C+E">E. Mocchiutti</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">V. Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Morales%2C+H+C">H. Cabrera Morales</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">F. Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=de+Bari%2C+A">A. de Bari</a>, <a href="/search/physics?searchtype=author&query=De+Vecchi%2C+C">C. De Vecchi</a>, <a href="/search/physics?searchtype=author&query=De+Vincenzi%2C+M">M. De Vincenzi</a>, <a href="/search/physics?searchtype=author&query=Furlanetto%2C+E">E. Furlanetto</a>, <a href="/search/physics?searchtype=author&query=Fuschino%2C+F">F. Fuschino</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Guffanti%2C+D">D. Guffanti</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a>, <a href="/search/physics?searchtype=author&query=Labanti%2C+C">C. Labanti</a>, <a href="/search/physics?searchtype=author&query=Maggi%2C+V">V. Maggi</a> , et al. (17 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1905.02049v3-abstract-short" style="display: inline;"> We report the first measurement of the temperature dependence of muon transfer rate from $渭$p atoms to oxygen between 100 and 300 K. Data were obtained from the X-ray spectra of delayed events in gaseous target H$_2$/O$_2$ exposed to a muon beam. Based on the data, we determined the muon transfer energy dependence up to 0.1 eV, showing an 8-fold increase in contrast with the predictions of constan… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.02049v3-abstract-full').style.display = 'inline'; document.getElementById('1905.02049v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1905.02049v3-abstract-full" style="display: none;"> We report the first measurement of the temperature dependence of muon transfer rate from $渭$p atoms to oxygen between 100 and 300 K. Data were obtained from the X-ray spectra of delayed events in gaseous target H$_2$/O$_2$ exposed to a muon beam. Based on the data, we determined the muon transfer energy dependence up to 0.1 eV, showing an 8-fold increase in contrast with the predictions of constant rate in the low energy limit. This work set constraints on theoretical models of muon transfer, and is of fundamental importance for the measurement of the hyperfine splitting of $渭$p by the FAMU collaboration. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1905.02049v3-abstract-full').style.display = 'none'; document.getElementById('1905.02049v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 14 July, 2020; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 May, 2019; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> May 2019. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 4 figure</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Phys. Lett. A, 384/26 (2020) 126667 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1808.06380">arXiv:1808.06380</a> <span> [<a href="https://arxiv.org/pdf/1808.06380">pdf</a>, <a href="https://arxiv.org/ps/1808.06380">ps</a>, <a href="https://arxiv.org/format/1808.06380">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Nuclear Experiment">nucl-ex</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Data Analysis, Statistics and Probability">physics.data-an</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/1138/1/012017">10.1088/1742-6596/1138/1/012017 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> FAMU: study of the energy dependent transfer rate $螞_{渭p \rightarrow 渭O}$ </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=FAMU+Collaboration"> FAMU Collaboration</a>, <a href="/search/physics?searchtype=author&query=Mocchiutti%2C+E">E. Mocchiutti</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">V. Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Furlanetto%2C+E">E. Furlanetto</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">K. S. Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Guffanti%2C+D">D. Guffanti</a>, <a href="/search/physics?searchtype=author&query=Pizzolotto%2C+C">C. Pizzolotto</a>, <a href="/search/physics?searchtype=author&query=Rachevski%2C+A">A. Rachevski</a>, <a href="/search/physics?searchtype=author&query=Stoychev%2C+L">L. Stoychev</a>, <a href="/search/physics?searchtype=author&query=Vallazza%2C+E">E. Vallazza</a>, <a href="/search/physics?searchtype=author&query=Zampa%2C+G">G. Zampa</a>, <a href="/search/physics?searchtype=author&query=Niemela%2C+J">J. Niemela</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">K. Ishida</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Baccolo%2C+G">G. Baccolo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">R. Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">F. Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Curioni%2C+A">A. Curioni</a>, <a href="/search/physics?searchtype=author&query=Maggi%2C+V">V. Maggi</a>, <a href="/search/physics?searchtype=author&query=Mazza%2C+R">R. Mazza</a>, <a href="/search/physics?searchtype=author&query=Moretti%2C+M">M. Moretti</a> , et al. (31 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1808.06380v2-abstract-short" style="display: inline;"> The main goal of the FAMU experiment is the measurement of the hyperfine splitting (hfs) in the 1S state of muonic hydrogen $螖E_{hfs}(渭^-p)1S$. The physical process behind this experiment is the following: $渭p$ are formed in a mixture of hydrogen and a higher-Z gas. When absorbing a photon at resonance-energy $螖E_{hfs}\approx0.182$~eV, in subsequent collisions with the surrounding $H_2$ molecules,… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.06380v2-abstract-full').style.display = 'inline'; document.getElementById('1808.06380v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1808.06380v2-abstract-full" style="display: none;"> The main goal of the FAMU experiment is the measurement of the hyperfine splitting (hfs) in the 1S state of muonic hydrogen $螖E_{hfs}(渭^-p)1S$. The physical process behind this experiment is the following: $渭p$ are formed in a mixture of hydrogen and a higher-Z gas. When absorbing a photon at resonance-energy $螖E_{hfs}\approx0.182$~eV, in subsequent collisions with the surrounding $H_2$ molecules, the $渭p$ is quickly de-excited and accelerated by $\sim2/3$ of the excitation energy. The observable is the time distribution of the K-lines X-rays emitted from the $渭Z$ formed by muon transfer $(渭p) +Z \rightarrow (渭Z)^*+p$, a reaction whose rate depends on the $渭p$ kinetic energy. The maximal response, to the tuned laser wavelength, of the time distribution of X-ray from K-lines of the $(渭Z)^*$ cascade indicate the resonance. During the preparatory phase of the FAMU experiment, several measurements have been performed both to validate the methodology and to prepare the best configuration of target and detectors for the spectroscopic measurement. We present here the crucial study of the energy dependence of the transfer rate from muonic hydrogen to oxygen ($螞_{渭p \rightarrow 渭O}$), precisely measured for the first time. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1808.06380v2-abstract-full').style.display = 'none'; document.getElementById('1808.06380v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 22 January, 2019; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 20 August, 2018; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2018. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">11 pages, 4 figures, published on Journal of Physics: Conference Series, proc. of International Conference on Precision Physics of Simple Atomic Systems - PSAS2018. arXiv admin note: text overlap with arXiv:1708.03172</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> J. Phys.: Conf. Ser. 1138 012017 (2018) </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1708.03172">arXiv:1708.03172</a> <span> [<a href="https://arxiv.org/pdf/1708.03172">pdf</a>, <a href="https://arxiv.org/ps/1708.03172">ps</a>, <a href="https://arxiv.org/format/1708.03172">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Atomic Physics">physics.atom-ph</span> <span class="tag is-small is-grey tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> </div> <p class="title is-5 mathjax"> First FAMU observation of muon transfer from mu-p atoms to higher-Z elements </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=FAMU+Collaboration"> FAMU Collaboration</a>, <a href="/search/physics?searchtype=author&query=Mocchiutti%2C+E">Emiliano Mocchiutti</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">Valter Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Carbone%2C+R">Rita Carbone</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">Miltcho Danailov</a>, <a href="/search/physics?searchtype=author&query=Furlanetto%2C+E">Elena Furlanetto</a>, <a href="/search/physics?searchtype=author&query=Gadedjisso-Tossou%2C+K+S">Komlan Segbeya Gadedjisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Guffanti%2C+D">Daniele Guffanti</a>, <a href="/search/physics?searchtype=author&query=Pizzolotto%2C+C">Cecilia Pizzolotto</a>, <a href="/search/physics?searchtype=author&query=Rachevski%2C+A">Alexandre Rachevski</a>, <a href="/search/physics?searchtype=author&query=Stoychev%2C+L">Lyubomir Stoychev</a>, <a href="/search/physics?searchtype=author&query=Vallazza%2C+E+S">Erik Silvio Vallazza</a>, <a href="/search/physics?searchtype=author&query=Zampa%2C+G">Gianluigi Zampa</a>, <a href="/search/physics?searchtype=author&query=Niemela%2C+J">Joseph Niemela</a>, <a href="/search/physics?searchtype=author&query=Ishida%2C+K">Katsuhiko Ishida</a>, <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">Andrzej Adamczak</a>, <a href="/search/physics?searchtype=author&query=Baccolo%2C+G">Giovanni Baccolo</a>, <a href="/search/physics?searchtype=author&query=Benocci%2C+R">Roberto Benocci</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">Roberto Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">Maurizio Bonesini</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">Francesco Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">Massimiliano Clemenza</a>, <a href="/search/physics?searchtype=author&query=Curioni%2C+A">Alessandro Curioni</a>, <a href="/search/physics?searchtype=author&query=Maggi%2C+V">Valter Maggi</a>, <a href="/search/physics?searchtype=author&query=Mazza%2C+R">Roberto Mazza</a> , et al. (32 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1708.03172v3-abstract-short" style="display: inline;"> The FAMU experiment aims to accurately measure the hyperfine splitting of the ground state of the muonic hydrogen atom. A measurement of the transfer rate of muons from hydrogen to heavier gases is necessary for this purpose. In June 2014, within a preliminary experiment, a pressurized gas-target was exposed to the pulsed low-energy muon beam at the RIKEN RAL muon facility (Rutherford Appleton Lab… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.03172v3-abstract-full').style.display = 'inline'; document.getElementById('1708.03172v3-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1708.03172v3-abstract-full" style="display: none;"> The FAMU experiment aims to accurately measure the hyperfine splitting of the ground state of the muonic hydrogen atom. A measurement of the transfer rate of muons from hydrogen to heavier gases is necessary for this purpose. In June 2014, within a preliminary experiment, a pressurized gas-target was exposed to the pulsed low-energy muon beam at the RIKEN RAL muon facility (Rutherford Appleton Laboratory, UK). The main goal of the test was the characterization of both the noise induced by the pulsed beam and the X-ray detectors. The apparatus, to some extent rudimental, has served admirably to this task. Technical results have been published that prove the validity of the choices made and pave the way for the next steps. This paper presents the results of physical relevance of measurements of the muon transfer rate to carbon dioxide, oxygen, and argon from non-thermalized excited mu-p atoms. The analysis methodology and the approach to the systematics errors are useful for the subsequent study of the transfer rate as function of the kinetic energy of the mu-p currently under way. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1708.03172v3-abstract-full').style.display = 'none'; document.getElementById('1708.03172v3-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 15 December, 2017; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 10 August, 2017; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> August 2017. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">15 pages, 3 figures, 2 tables</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1604.01572">arXiv:1604.01572</a> <span> [<a href="https://arxiv.org/pdf/1604.01572">pdf</a>, <a href="https://arxiv.org/ps/1604.01572">ps</a>, <a href="https://arxiv.org/format/1604.01572">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1748-0221/11/05/P05007">10.1088/1748-0221/11/05/P05007 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Steps towards the hyperfine splitting measurement of the muonic hydrogen ground state: pulsed muon beam and detection system characterization </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Adamczak%2C+A">A. Adamczak</a>, <a href="/search/physics?searchtype=author&query=Baccolo%2C+G">G. Baccolo</a>, <a href="/search/physics?searchtype=author&query=Bakalov%2C+D">D. Bakalov</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G. Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Bertoni%2C+R">R. Bertoni</a>, <a href="/search/physics?searchtype=author&query=Bonesini%2C+M">M. Bonesini</a>, <a href="/search/physics?searchtype=author&query=Bonvicini%2C+V">V. Bonvicini</a>, <a href="/search/physics?searchtype=author&query=Campana%2C+R">R. Campana</a>, <a href="/search/physics?searchtype=author&query=Carbone%2C+R">R. Carbone</a>, <a href="/search/physics?searchtype=author&query=Cervi%2C+T">T. Cervi</a>, <a href="/search/physics?searchtype=author&query=Chignoli%2C+F">F. Chignoli</a>, <a href="/search/physics?searchtype=author&query=Clemenza%2C+M">M. Clemenza</a>, <a href="/search/physics?searchtype=author&query=Colace%2C+L">L. Colace</a>, <a href="/search/physics?searchtype=author&query=Curioni%2C+A">A. Curioni</a>, <a href="/search/physics?searchtype=author&query=Danailov%2C+M">M. Danailov</a>, <a href="/search/physics?searchtype=author&query=Danev%2C+P">P. Danev</a>, <a href="/search/physics?searchtype=author&query=D%27Antone%2C+I">I. D'Antone</a>, <a href="/search/physics?searchtype=author&query=De%2C+A">A. De</a>, <a href="/search/physics?searchtype=author&query=De%2C+C">C. De</a>, <a href="/search/physics?searchtype=author&query=De%2C+M">M. De</a>, <a href="/search/physics?searchtype=author&query=Furini%2C+M">M. Furini</a>, <a href="/search/physics?searchtype=author&query=Fuschino%2C+F">F. Fuschino</a>, <a href="/search/physics?searchtype=author&query=Gadejisso-Tossou%2C+K">K. Gadejisso-Tossou</a>, <a href="/search/physics?searchtype=author&query=Guffanti%2C+D">D. Guffanti</a>, <a href="/search/physics?searchtype=author&query=Iaciofano%2C+A">A. Iaciofano</a> , et al. (30 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1604.01572v2-abstract-short" style="display: inline;"> The high precision measurement of the hyperfine splitting of the muonic-hydrogen atom ground state with pulsed and intense muon beam requires careful technological choices both in the construction of a gas target and of the detectors. In June 2014, the pressurized gas target of the FAMU experiment was exposed to the low energy pulsed muon beam at the RIKEN RAL muon facility. The objectives of the… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.01572v2-abstract-full').style.display = 'inline'; document.getElementById('1604.01572v2-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1604.01572v2-abstract-full" style="display: none;"> The high precision measurement of the hyperfine splitting of the muonic-hydrogen atom ground state with pulsed and intense muon beam requires careful technological choices both in the construction of a gas target and of the detectors. In June 2014, the pressurized gas target of the FAMU experiment was exposed to the low energy pulsed muon beam at the RIKEN RAL muon facility. The objectives of the test were the characterization of the target, the hodoscope and the X-ray detectors. The apparatus consisted of a beam hodoscope and X-rays detectors made with high purity Germanium and Lanthanum Bromide crystals. In this paper the experimental setup is described and the results of the detector characterization are presented. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1604.01572v2-abstract-full').style.display = 'none'; document.getElementById('1604.01572v2-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 21 June, 2016; <span class="has-text-black-bis has-text-weight-semibold">v1</span> submitted 6 April, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">22 pages, 14 figures, published and open access on JINST</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Journal ref:</span> Journal of Instrumentation 11/05, P05007, 2016 </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1601.02784">arXiv:1601.02784</a> <span> [<a href="https://arxiv.org/pdf/1601.02784">pdf</a>, <a href="https://arxiv.org/format/1601.02784">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Instrumentation and Detectors">physics.ins-det</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1088/1742-6596/689/1/012017">10.1088/1742-6596/689/1/012017 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Development and tests of a new prototype detector for the XAFS beamline at Elettra Synchrotron in Trieste </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Fabiani%2C+S">S Fabiani</a>, <a href="/search/physics?searchtype=author&query=Ahangarianabhari%2C+M">M Ahangarianabhari</a>, <a href="/search/physics?searchtype=author&query=Baldazzi%2C+G">G Baldazzi</a>, <a href="/search/physics?searchtype=author&query=Bellutti%2C+P">P Bellutti</a>, <a href="/search/physics?searchtype=author&query=Bertuccio%2C+G">G Bertuccio</a>, <a href="/search/physics?searchtype=author&query=Bruschi%2C+M">M Bruschi</a>, <a href="/search/physics?searchtype=author&query=Bufon%2C+J">J Bufon</a>, <a href="/search/physics?searchtype=author&query=Carrato%2C+S">S Carrato</a>, <a href="/search/physics?searchtype=author&query=Castoldi%2C+A">A Castoldi</a>, <a href="/search/physics?searchtype=author&query=Cautero%2C+G">G Cautero</a>, <a href="/search/physics?searchtype=author&query=Ciano%2C+S">S Ciano</a>, <a href="/search/physics?searchtype=author&query=Cicuttin%2C+A">A Cicuttin</a>, <a href="/search/physics?searchtype=author&query=Crespo%2C+M+L">M L Crespo</a>, <a href="/search/physics?searchtype=author&query=Santos%2C+M+D">M Dos Santos</a>, <a href="/search/physics?searchtype=author&query=Gandola%2C+M">M Gandola</a>, <a href="/search/physics?searchtype=author&query=Giacomini%2C+G">G Giacomini</a>, <a href="/search/physics?searchtype=author&query=Giuressi%2C+D">D Giuressi</a>, <a href="/search/physics?searchtype=author&query=Guazzoni%2C+C">C Guazzoni</a>, <a href="/search/physics?searchtype=author&query=Menk%2C+R+H">R H Menk</a>, <a href="/search/physics?searchtype=author&query=Niemela%2C+J">J Niemela</a>, <a href="/search/physics?searchtype=author&query=Olivi%2C+L">L Olivi</a>, <a href="/search/physics?searchtype=author&query=Picciotto%2C+A">A Picciotto</a>, <a href="/search/physics?searchtype=author&query=Piemonte%2C+C">C Piemonte</a>, <a href="/search/physics?searchtype=author&query=Rashevskaya%2C+I">I Rashevskaya</a>, <a href="/search/physics?searchtype=author&query=Rachevski%2C+A">A Rachevski</a> , et al. (8 additional authors not shown) </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1601.02784v1-abstract-short" style="display: inline;"> The XAFS beamline at Elettra Synchrotron in Trieste combines X-ray absorption spectroscopy and X-ray diffraction to provide chemically specific structural information of materials. It operates in the energy range 2.4-27 keV by using a silicon double reflection Bragg monochromator. The fluorescence measurement is performed in place of the absorption spectroscopy when the sample transparency is too… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.02784v1-abstract-full').style.display = 'inline'; document.getElementById('1601.02784v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1601.02784v1-abstract-full" style="display: none;"> The XAFS beamline at Elettra Synchrotron in Trieste combines X-ray absorption spectroscopy and X-ray diffraction to provide chemically specific structural information of materials. It operates in the energy range 2.4-27 keV by using a silicon double reflection Bragg monochromator. The fluorescence measurement is performed in place of the absorption spectroscopy when the sample transparency is too low for transmission measurements or the element to study is too diluted in the sample. We report on the development and on the preliminary tests of a new prototype detector based on Silicon Drift Detectors technology and the SIRIO ultra low noise front-end ASIC. The new system will be able to reduce drastically the time needed to perform fluorescence measurements, while keeping a short dead time and maintaining an adequate energy resolution to perform spectroscopy. The custom-made silicon sensor and the electronics are designed specifically for the beamline requirements. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1601.02784v1-abstract-full').style.display = 'none'; document.getElementById('1601.02784v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 12 January, 2016; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> January 2016. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">Proceeding of the 6YRM 12th-14th Oct 2015 - L'Aquila (Italy). Accepted for publication on Journal of Physics: Conference Series</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/1309.6672">arXiv:1309.6672</a> <span> [<a href="https://arxiv.org/pdf/1309.6672">pdf</a>, <a href="https://arxiv.org/ps/1309.6672">ps</a>, <a href="https://arxiv.org/format/1309.6672">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevLett.113.114301">10.1103/PhysRevLett.113.114301 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Heat transport in the geostrophic regime of rotating Rayleigh-B{茅}nard convection </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Ecke%2C+R+E">Robert E. Ecke</a>, <a href="/search/physics?searchtype=author&query=Niemela%2C+J+J">Joseph J. Niemela</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="1309.6672v1-abstract-short" style="display: inline;"> We report experimental measurements of heat transport in rotating Rayleigh-B{茅}nard convection in a cylindrical convection cell with aspect ratio $螕= 1/2$. The fluid was helium gas with Prandtl number Pr = 0.7. The range of control parameters was Rayleigh number $4 \times 10^9 < {\rm Ra} < 4 \times 10^{11}$ and Ekman number $2 \times 10^{-7} < {\rm Ek} < 3 \times 10^{-5}$(corresponding to Taylor n… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1309.6672v1-abstract-full').style.display = 'inline'; document.getElementById('1309.6672v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="1309.6672v1-abstract-full" style="display: none;"> We report experimental measurements of heat transport in rotating Rayleigh-B{茅}nard convection in a cylindrical convection cell with aspect ratio $螕= 1/2$. The fluid was helium gas with Prandtl number Pr = 0.7. The range of control parameters was Rayleigh number $4 \times 10^9 < {\rm Ra} < 4 \times 10^{11}$ and Ekman number $2 \times 10^{-7} < {\rm Ek} < 3 \times 10^{-5}$(corresponding to Taylor number $4 \times 10^9 < {\rm Ta} < 1 \times 10^{14}$ and convective Rossby number $0.07 < {\rm Ro} < 5$). We determine the crossover from weakly rotating turbulent convection to rotation dominated geostrophic convection through experimental measurements of the normalized heat transport Nu. The heat transport for the rotating state in the geostrophic regime, normalized by the zero-rotation heat transport, is consistent with scaling of $({\rm RaEk}^{-7/4})^尾$ with $尾\approx 1$. A phase diagram is presented that encapsulates measurements on the potential geostrophic turbulence regime of rotating thermal convection. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('1309.6672v1-abstract-full').style.display = 'none'; document.getElementById('1309.6672v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 25 September, 2013; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> September 2013. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 pages, 4 figures</span> </p> </li> <li class="arxiv-result"> <div class="is-marginless"> <p class="list-title is-inline-block"><a href="https://arxiv.org/abs/physics/0404048">arXiv:physics/0404048</a> <span> [<a href="https://arxiv.org/pdf/physics/0404048">pdf</a>, <a href="https://arxiv.org/ps/physics/0404048">ps</a>, <a href="https://arxiv.org/format/physics/0404048">other</a>] </span> </p> <div class="tags is-inline-block"> <span class="tag is-small is-link tooltip is-tooltip-top" data-tooltip="Fluid Dynamics">physics.flu-dyn</span> </div> <div class="is-inline-block" style="margin-left: 0.5rem"> <div class="tags has-addons"> <span class="tag is-dark is-size-7">doi</span> <span class="tag is-light is-size-7"><a class="" href="https://doi.org/10.1103/PhysRevE.72.066308">10.1103/PhysRevE.72.066308 <i class="fa fa-external-link" aria-hidden="true"></i></a></span> </div> </div> </div> <p class="title is-5 mathjax"> Critical Fluctuation of Wind Reversals in Convective Turbulence </p> <p class="authors"> <span class="search-hit">Authors:</span> <a href="/search/physics?searchtype=author&query=Hwa%2C+R+C">Rudolph C. Hwa</a>, <a href="/search/physics?searchtype=author&query=Yang%2C+C+B">C. B. Yang</a>, <a href="/search/physics?searchtype=author&query=Bershadskii%2C+S">S. Bershadskii</a>, <a href="/search/physics?searchtype=author&query=Niemela%2C+J+J">J. J. Niemela</a>, <a href="/search/physics?searchtype=author&query=Sreenivasan%2C+K+R">K. R. Sreenivasan</a> </p> <p class="abstract mathjax"> <span class="has-text-black-bis has-text-weight-semibold">Abstract</span>: <span class="abstract-short has-text-grey-dark mathjax" id="physics/0404048v1-abstract-short" style="display: inline;"> The irregular reversals of wind direction in convective turbulence are found to have fluctuating intervals that can be related to critical behavior. It is shown that the net magnetization of a 2D Ising lattice of finite size fluctuates in the same way. Detrended fluctuation analysis of the wind reversal time series results in a scaling behavior that agrees with that of the Ising problem. The pro… <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0404048v1-abstract-full').style.display = 'inline'; document.getElementById('physics/0404048v1-abstract-short').style.display = 'none';">▽ More</a> </span> <span class="abstract-full has-text-grey-dark mathjax" id="physics/0404048v1-abstract-full" style="display: none;"> The irregular reversals of wind direction in convective turbulence are found to have fluctuating intervals that can be related to critical behavior. It is shown that the net magnetization of a 2D Ising lattice of finite size fluctuates in the same way. Detrended fluctuation analysis of the wind reversal time series results in a scaling behavior that agrees with that of the Ising problem. The properties found suggest that the wind reversal phenomenon exhibits signs of self-organized criticality. <a class="is-size-7" style="white-space: nowrap;" onclick="document.getElementById('physics/0404048v1-abstract-full').style.display = 'none'; document.getElementById('physics/0404048v1-abstract-short').style.display = 'inline';">△ Less</a> </span> </p> <p class="is-size-7"><span class="has-text-black-bis has-text-weight-semibold">Submitted</span> 8 April, 2004; <span class="has-text-black-bis has-text-weight-semibold">originally announced</span> April 2004. </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Comments:</span> <span class="has-text-grey-dark mathjax">4 RevTeX pages + 3 figures in eps</span> </p> <p class="comments is-size-7"> <span class="has-text-black-bis has-text-weight-semibold">Report number:</span> OITS-738 </p> </li> </ol> <div class="is-hidden-tablet"> <!-- feedback for mobile only --> <span class="help" 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