I.G. Irastorza
A5068635247- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Solar and Space Plasma Dynamics
- Superconducting and THz Device Technology
- Nuclear Physics and Applications
- Astronomy and Astrophysical Research
- Scientific Research and Discoveries
- Photocathodes and Microchannel Plates
- Nuclear physics research studies
- Geophysics and Gravity Measurements
- Plasma Diagnostics and Applications
- CCD and CMOS Imaging Sensors
- Radioactive Decay and Measurement Techniques
- Muon and positron interactions and applications
- Physics of Superconductivity and Magnetism
- Quantum, superfluid, helium dynamics
- Spectroscopy and Laser Applications
- Quantum Chromodynamics and Particle Interactions
- Superconducting Materials and Applications
Universidad de Zaragoza
2016-2025
Canfranc Underground Laboratory
2010-2022
European Organization for Nuclear Research
2003-2021
Max Planck Institute for Physics
2018
Max Planck Society
2018
University of South Carolina
2002-2016
University of Coimbra
2015-2016
CEA Paris-Saclay
2005-2015
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2005-2015
Acıbadem Adana Hospital
2015
Hypothetical low-mass particles, such as axions, provide a compelling explanation for the dark matter in universe. Such particles are expected to emerge abundantly from hot interior of stars. To test this prediction, CERN Axion Solar Telescope (CAST) uses 9 T refurbished Large Hadron Collider magnet directed towards Sun. In strong magnetic field, solar axions can be converted X-ray photons which recorded by detectors. 2013–2015 run, thanks low-background detectors and new telescope,...
We have searched for solar axions or similar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup with improved conditions in all detectors. From absence of excess X-rays when magnet was pointing Sun, we set an upper limit on axion-photon coupling 8.8 x 10^{-11} GeV^{-1} at 95% CL m_a <~ 0.02 eV. This result is best experimental over a broad range axion masses and eV also supersedes previous derived from energy-loss arguments globular-cluster stars.
Four decades after its prediction, the axion remains most compelling solution to Strong-CP problem and a well-motivated dark matter candidate, inspiring host of elegant ultrasensitive experiments based on axion-photon mixing. This report reviews experimental situation several fronts. The microwave cavity experiment is making excellent progress in search for axions microelectronvolt range may be plausibly extended up 100 mu eV. Within past years however, it has been realized that are...
The International Axion Observatory (IAXO) will be a forth generation axion helioscope. As its primary physics goal, IAXO look for axions or axion-like particles (ALPs) originating in the Sun via Primakoff conversion of solar plasma photons. In terms signal-to-noise ratio, about 4–5 orders magnitude more sensitive than CAST, currently most powerful helioscope, reaching sensitivity to axion-photon couplings down few × 10−12 GeV−1 and thus probing large fraction unexplored ALP parameter space....
Abstract The Physics Beyond Colliders initiative is an exploratory study aimed at exploiting the full scientific potential of CERN’s accelerator complex and infrastructures through projects complementary to LHC other possible future colliders. These will target fundamental physics questions in modern particle physics. This document presents status proposals presented framework Standard Model working group, explore their reach impact that CERN could have next 10–20 years on international landscape.
Abstract With the establishment and maturation of experimental programs searching for new physics with sizeable couplings at LHC, there is an increasing interest in broader particle astrophysics community exploring light feebly-interacting particles as a paradigm complementary to New Physics sector TeV scale beyond. FIPs 2020 has been first workshop fully dedicated was held virtually from 31 August 4 September 2020. The gathered together experts collider, beam dump, fixed target experiments,...
There are a number of observational hints from astrophysics which point to the existence stellar energy losses beyond ones accounted for by neutrino emission. These excessive may be explained new sub-keV mass pseudoscalar Nambu-Goldstone boson with tiny couplings photons, electrons, and nucleons. An attractive possibility is identify this particle axion—the hypothetical pseudo predicted Peccei-Quinn solution strong CP problem. We explore in terms DFSZ-type axion KSVZ-type axion/majoron,...
The International Germanium Experiment (IGEX) has analyzed 117 mol yr of 76Ge data from its isotopically enriched (86% 76Ge) germanium detectors. Applying pulse-shape discrimination to the more recent data, lower bound on half-life for neutrinoless double-beta decay is T1/2(0ν)>1.57×1025yr (90% C.L.). This corresponds an upper in Majorana neutrino mass parameter, ⟨mν⟩, between 0.33 and 1.35 eV, depending choice theoretical nuclear matrix elements used analysis.Received 29 October...
Hypothetical axionlike particles with a two-photon interaction would be produced in the sun by Primakoff process. In laboratory magnetic field ("axion helioscope"), they transformed into x-rays energies of few keV. Using decommissioned Large Hadron Collider test magnet, CERN Axion Solar Telescope ran for about 6 months during 2003. The first results from analysis these data are presented here. No signal above background was observed, implying an upper limit to axion-photon coupling...
We have searched for solar axions or other pseudoscalar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup. Whereas we previously reported results from CAST with evacuated magnet bores (Phase I), setting limits on lower mass axions, here report where were filled 4He gas II) of variable pressure. The introduction generates a refractive photon mγ, thereby achieving maximum possible conversion rate those axion masses ma match mγ. With 160 different...
The possibility to probe new physics scenarios of light Majorana neutrino exchange and right-handed currents at the planned next generation neutrinoless double beta decay experiment SuperNEMO is discussed. Its ability study different isotopes track outgoing electrons provides means discriminate underlying mechanisms for by measuring half-life electron angular energy distributions.
We present the case for a dark matter detector with directional sensitivity. This document was developed at 2009 CYGNUS workshop on detection, and contains contributions from theorists experimental groups in field. describe need sensitivity; each experiment presents their project's status; we close feasibility study scaling up to one ton detector, which would cost around $150M.
Dark sectors, consisting of new, light, weakly-coupled particles that do not interact with the known strong, weak, or electromagnetic forces, are a particularly compelling possibility for new physics. Nature may contain numerous dark each their own beautiful structure, distinct particles, and forces. This review summarizes physics motivation sectors exciting opportunities experimental exploration. It is summary Intensity Frontier subgroup "New, Light, Weakly-coupled Particles" Community...
The CERN Axion Solar Telescope (CAST) has extended its search for solar axions by using 3He as a buffer gas. At T=1.8 K this allows larger pressure settings and hence sensitivity to higher axion masses than our previous measurements with 4He. With about 1 h of data taking at each 252 different we have scanned the mass range 0.39 eV < m_a 0.64 eV. From absence excess X-rays when magnet was pointing Sun set typical upper limit on axion-photon coupling g_ag 2.3 x 10^{-10} GeV^{-1} 95% CL, exact...
We study the feasibility of a new generation axion helioscope, most ambitious and promising detector solar axions to date. show that large improvements in magnetic field volume, x-ray focusing optics backgrounds are possible beyond those achieved CERN Axion Solar Telescope (CAST). For hadronic models, sensitivity axion-photon coupling gaγ ≳ few × 10−12 GeV−1 is conceivable, 1–1.5 orders magnitude CAST sensitivity. If also couple electrons, Sun produces larger flux for same value Peccei-Quinn...
A new Micromegas manufacturing technique, based on kapton etching technology, has been developed recently, resulting in further improvement of the characteristics detector, such as uniformity and stability. Excellent energy resolution obtained, reaching 11% FWHM for 5.9 keV photon peak the55Fe X-ray source 1.8% (with possible evidence less than 1%) 5.5 MeV alpha 241Am source. The Microbulk detector shows several advantages like flexible structure, low material high radio-purity, opening thus...
The CERN Axion Solar Telescope has finished its search for solar axions with (3)He buffer gas, covering the range 0.64 eV ≲ ma 1.17 eV. This closes gap to cosmological hot dark matter limit and actually overlaps it. From absence of excess x rays when magnet was pointing Sun we set a typical upper on axion-photon coupling gaγ 3.3 × 10(-10) GeV(-1) at 95% C.L., exact value depending pressure setting. Future direct axion searches will focus increasing sensitivity smaller values gaγ, example by...
Several stellar systems (white dwarfs, red giants, horizontal branch stars and possibly the neutron star in supernova remnant Cassiopeia A) show a mild preference for non-standard cooling mechanism when compared with theoretical models. This exotic could be provided by Weakly Interacting Slim Particles (WISPs), produced hot cores abandoning unimpeded, contributing directly to energy loss. Taken individually, these excesses do not strong statistical weight. However, if one consistently...
We review the physics potential of a next generation search for solar axions: International Axion Observatory (IAXO) . Endowed with sensitivity to discover axion-like particles (ALPs) coupling photons as small gaγ∼ 10−12 GeV−1, or electrons gae∼10−13, IAXO has find QCD axion in 1 meV∼1 eV mass range where it solves strong CP problem, can account cold dark matter Universe and be responsible anomalous cooling observed number stellar systems. At same time, will have enough detect lower axions...