1,512 research outputs found
Scaling behavior in the adiabatic Dicke Model
We analyze the quantum phase transition for a set of -two level systems
interacting with a bosonic mode in the adiabatic regime. Through the
Born-Oppenheimer approximation, we obtain the finite-size scaling expansion for
many physical observables and, in particular, for the entanglement content of
the system.Comment: 4 pages, 3 figure
The PADME experiment
The PADME experiment, hosted at the Laboratori Nazionali di Frascati, will
search for a Dark Photon that decays in invisible channels with a mass up to
23.7\,\mbox{MeV} and coupling constant down to .Comment: 3 pages, 2 figures, to be published in the IFAE2016 proceedings on
Nuovo Cimento C - Colloquia on Physic
Low energy analysis in CUORE-0
The majority of the mass of the Universe appears to be made of an unknown form of matter, called Dark Matter. The upcoming CUORE experiment, thanks to its large mass and low background, will be able to search for a DM annual modulation signal. The final sensitivity will depend on the achievable energy threshold. Here we present the low energy trigger developed for CUORE, some examples obtained with its application to CUORE-0 (the CUORE test detector) and the tools for the low energy analysis
Dark photon search with the PADME experiment
The PADME experiment, at the Laboratori Nazionali di Frascati, is dedicated to the search for a dark photon that decays into invisible channels. Its aim is to observe the reaction e+ e− → A γ, by searching for unbalanced final state events (A undetected), with a missing energy equal to the non-interacting A mass. With the present beam energy of 550 MeV it is possible to search for masses up to 23.7 MeV, while the foreseen statistics allows to scan coupling constants down to ∼ 10−3
Performance of the PADME calorimeter prototype at the DANE BTF
The PADME experiment at the DANE Beam-Test Facility (BTF) aims at
searching for invisible decays of the dark photon by measuring the final state
missing mass in the process , with undetected. The
measurement requires the determination of the 4-momentum of the recoil photon,
performed using a homogeneous, highly segmented BGO crystals calorimeter. We
report the results of the test of a 55 crystals prototype performed
with an electron beam at the BTF in July 2016
Measurements and optimization of the light yield of a TeO crystal
Bolometers have proven to be good instruments to search for rare processes
because of their excellent energy resolution and their extremely low intrinsic
background. In this kind of detectors, the capability of discriminating alpha
particles from electrons represents an important aspect for the background
reduction. One possibility for obtaining such a discrimination is provided by
the detection of the Cherenkov light which, at the low energies of the natural
radioactivity, is only emitted by electrons. This paper describes the method
developed to evaluate the amount of light produced by a crystal of TeO when
hit by a 511 keV photon. The experimental measurements and the results of a
detailed simulation of the crystal and the readout system are shown and
compared. A light yield of about 52 Cherenkov photons per deposited MeV was
measured. The effect of wrapping the crystal with a PTFE layer, with the aim of
maximizing the light collection, is also presented
Cancer treatment-induced oral mucositis
Oral mucositis is one of the main complications in non-surgical cancer treatments. It represents the major dose-limiting toxicity for some chemotherapeutic agents, for radiotherapy of the head and neck region and for some radiochemotherapy combined treatments. Many reviews and clinical studies have been published in order to define the best clinical protocol for prophylaxis or treatment of mucositis, but a consensus has not yet been obtained. This paper represents an updated review of prophylaxis and treatment of antineoplastic-therapy-related mucositis using a MEDLINE search up to May 2006, in which more than 260 clinical studies have been found. They have been divided according to antineoplastic therapy (chemotherapy, radiotherapy, chemo-radiotherapy, high-dose chemotherapy). The prophylactic or therapeutic use of the analysed agents, the number of enrolled patients and the study design (randomized or not) were also specified for most studies. Accurate pre-treatment assessment of oral cavity hygiene, frequent review of symptoms during treatment, use of traditional mouthwashes to obtain mechanical cleaning of the oral cavity and administration of some agents like benzydamine, imidazole antibiotics, tryazolic antimycotics, povidone iodine, keratinocyte growth factor and vitamin E seem to reduce the intensity of mucositis. Physical approaches like cryotherapy, low energy Helium-Neon laser or the use of modern radiotherapy techniques with the exclusion of the oral cavity from radiation fields have been shown to be efficacious in preventing mucositis onset. Nevertheless a consensus protocol of prophylaxis and treatment of oral mucositis has not yet been obtained
Italy Made in Britain: Contemporary British Perspectives on Italian Culture
Introduzione a "Italy Made in England
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