Neutrino mixings as a source of charged lepton flavor violations

Within the left–right symmetric model (LRM) the Z boson decay into the channel Z→τμ are investigated. The branching ratios of this decay is found in the third order of the perturbation theory. The obtained expression does not equal to zero only at the existence of the neutrino mixings. This means that from the point of view of the LRM, the nonconservations of the neutral and the charged lepton flavors have the same nature. As a result, the elucidation of the decays Z→lil̄ k(i≠k) could provide data concerned the neutrino sector structure of the LRM. The neutrino sector parameters which could be measured in that case are as follows: (i) difference of the heavy neutrino masses; (ii) heavy–heavy neutrino mixing; (iii) heavy–light neutrino mixing

Efficient, highly selective laser isotope separation of carbon-13

We recently demonstrated an original approach to highly selective laser isotope separation of carbon-13 that employs vibrational overtone pre-excitation of CF3 H together with infrared multiphoton dissociation [O.V. Boyarkin, M. Kowalczyk, T.R. Rizzo, J. Chem. Phys. 118, 93 (2003)]. The practical implementation of this approach was complicated by the long absorption path length needed for the overtone excitation laser beam. In the present work, we employ a low overtone level for the pre-excitation that shortens this pathway, facilitating engineering of the process. We propose an optimal configuration of the isotope separation scheme and consider a realistic example of a separation unit for isotopic enrichment of carbon-13 to 94–98%. The photon energy expenditure of 97 eV per separated atom is much lower than that of the current commercial laser technology, making this process economically feasible

Neutrino oscillations in intensive magnetic fields

The evolution of the neutrino flux traveling through condensed matter and intensive magnetic field is considered. As the examples of the intensive magnetic field the magnetic fields of the coupled sunspots and the collapsar jets are considered. It is assumed that the neutrinos possess both the dipole magnetic moment and the anapole moment while the magnetic field may takes the values ≥ 105 Gs and has the twisting nature. The problem is investigated within three neutrino generations. The possible resonance conversions of the neutrino flux are examined

The (g−2) µ Anomaly Within the Left-Right Symmetric Model

Within the model based on the SU(2)L × SU(2)R × U(1)B−L gauge group (leftright symmetric model- LRM) the influence of the Higgs sector on the value of the muon magnetic moment (MMM) is investigated. The contributions caused by the doubly charged Higgs boson ∆ (−−) 2 are found. The obtained value of the MMM is the function of the mass of ∆ (−−) 2 boson and the triplet Yukawa coupling constants. We demonstrate that at the definite values of these parameters the LRM provides an explanation of the E989 experiment at Fermilab

Conformational distribution of bradykinin [bk+2H]2+ revealed by cold ion spectroscopy coupled with FAIMS

We employ Cold Ion Spectroscopy (CIS) in conjunction with high-Field Asymmetric Waveform Ion Mobility Spectrometry (FAIMS) to study the peptide bradykinin in its doubly protonated charge state ([bk+2H]2+). Using FAIMS we partially separate the electrosprayed [bk+2H]2+ ions into two conformational families and selectively introduce one of them at a time into a cold ion trap mass spectrometer, where we probe them by UV photofragment spectroscopy. Although the two conformational families have distinct electronic spectra, some cross-conformer contamination can be observed under certain conditions. We demonstrate that this contamination comes from isomerization of ions energized during and/or after their separation and not from incomplete separation of the initially electrosprayed conformations in the FAIMS stage. By varying the injection voltage of the ions into our mass spectrometer we can intentionally induce isomerization to produce what seems to be a gas phase equilibrium distribution of conformers. This distribution is different from the one produced initially by electrospray, indicating that some of the conformers are kinetically trapped and may be related to conformers that are more favored in solution

UV and IR Spectroscopy of Metal Ion-Crown Ether Complexes in the Gas Phase

Seventh International Conference on Advanced Vibrational Spectroscopy (ICAVS-7), 2013年8月25日-30日, 神戸国際会議

On-line recognition of supernova neutrino bursts in the LVD detector

In this paper we show the capabilities of the Large Volume Detector (INFN Gran Sasso National Laboratory) to identify a neutrino burst associated to a supernova explosion, in the absence of an "external trigger", e.g., an optical observation. We describe how the detector trigger and event selection have been optimized for this purpose, and we detail the algorithm used for the on-line burst recognition. The on-line sensitivity of the detector is defined and discussed in terms of supernova distance and electron anti-neutrino intensity at the source.Comment: Accepted for pubblication on Astroparticle Physics. 13 pages, 10 figure

Cold Spectroscopy of Metal Ion-Crown Ether Complexes in the Gas Phase

Seventh International Conference on Advanced Vibrational Spectroscopy (ICAVS-7), 2013年8月25日-30日, 神戸国際会議

First CNGS events detected by LVD

The CERN Neutrino to Gran Sasso (CNGS) project aims to produce a high energy, wide band $\nu_{\mu}$ beam at CERN and send it toward the INFN Gran Sasso National Laboratory (LNGS), 732 km away. Its main goal is the observation of the $\nu_{\tau}$ appearance, through neutrino flavour oscillation. The beam started its operation in August 2006 for about 12 days: a total amount of $7.6~10^{17}$ protons were delivered to the target. The LVD detector, installed in hall A of the LNGS and mainly dedicated to the study of supernova neutrinos, was fully operating during the whole CNGS running time. A total number of 569 events were detected in coincidence with the beam spill time. This is in good agreement with the expected number of events from Montecarlo simulations.Comment: Accepted for publication by the European Physical Journal C ; 7 pages, 11 figure