Branching ratio

Top PDF Branching ratio:

High-precision half-life and branching-ratio measurements for superallowed Fermi β+ emitters at TRIUMF – ISAC

A program at the Isotope Separator and Accelerator (ISAC) facility at TRIUMF, Canada’s national laboratory for particle and nuclear physics, is in place to perform high-precision half-life, branching- ratio, and Q value studies for these superallowed β emitters. These experiments are performed us- ing TRIUMF’s Ion Trap for Atomic and Nuclear Science (TITAN) [13]; a 4π gas proportional β counter; and the 8π γ-ray Spectrometer [14], a spherical array consisting of 20 Compton-suppressed high-purity germanium (HPGe) detectors, with ancillary detection systems including the Zero-Degree Scintillator (ZDS), the Scintillating Electron-Positron Tagging Array (SCEPTAR), and the Pentago- nal Array for Conversion Electron Spectroscopy (PACES) [15]. With the capability of measuring all experimental quantities required for determining superallowed f t values, ISAC is providing crucial data to help distinguish between the theoretical models used for calculating ISB corrections.

Calculation of Beta Decay Half-Lives and Delayed Neutron Branching Ratio of Fission Fragments with Skyrme-QRPA

Abstract. Nuclear β-decay and delayed neutron (DN) emission is important for the r- process nucleosynthesis after the freeze-out, and stable and safe operation of nuclear re- actors. Even though radioactive beam facilities have enabled us to measure β-decay and branching ratio of neutron-rich nuclei apart from the stability line in the nuclear chart, there are still a lot of nuclei which one cannot investigate experimentally. In particular, information on DN is rather scarce than that of T 1/2 . To predict T 1/2 and the branching

Evaluation of the 10B(n,α) Cross Section and Branching Ratio EUR 3950

MORET European Atomic Energy Community ­ EURATOM Joint Nuclear Research Center Geel Establishment ­ Belgium Central Bureau for Nuclear Measurements ­ CBNM Brussels, June 1968 ­ 36 Pages [r]

Pr 3+ Doped Aluminobismuthphosphate Glasses as Optical Amplifiers

The spectroscopic analysis of Nd 3+ , Eu 3+ , Pr 3+ rare earth ions in the ABP laser host has been performed following the standard J-O model that predicts the three phenomological parameters. Values of this parameters were then employed to obtain spontaneous emission probability, stimulated emission cross section , decay rates, radiative lifetimes and branching ratio of the principal intermainfold transitions to the lower lying mainfolds.

Nuclear data uncertainty analysis for the Po-210 production in MYRRHA

The results obtained in this work call attention to the 209 Bi evaluations and uncertainties. Signi ﬁ cant efforts are necessary to reduce the discrepancies between evaluated data. In particular, accurate measurements should be carried out to increase our knowledge of the 209 Bi activation cross section and the branching ratio, not only at thermal energy and for the ﬁ rst resonance at about 800 eV, but also in the energy ranges of interest for LBE reactors such MYRRHA, as made clear by the sensitivity plots. Because of the disagreement between libraries, a consistent evaluation for the branching ratios should be elaborated that also includes the energy-dependent behavior in the resonance region and above. This evaluation should be supported by additional experimental measurements, since the existing databases only contain a few data point.

Search for K+ → π+νν̄ at the NA62 experiment

Abstract. Looking for phenomena beyond the Standard Model (SM) in rare decays is a complementary approach to direct searches for New Physics (NP) at colliders. One of the theoretically cleanest processes is the ultra rare decay K + → π + ν¯ ν. The goal of the NA62 experiment at CERN SPS is to measure the branching ratio (BR) of this decay with 10% precision. The experiment has been launched in 2014. In 2015, the detector was commissioned at a low intensity beam. The experimental setup is described and performances achieved in 2015 are discussed in view of the ﬁnal measurement.

Search for Standard Model Higgs boson in H → τ+τ− decay with the ATLAS detector

The statistical analysis of the data employs a binned likelihood function constructed as a product of the like- lihood terms for each category. The likelihood in each category is a product over bins in the distributions of the ττ mass. In each bin of the mass distributions, the likeli- hood function for the observed number of events is mod- eled according to a Poisson distribution based upon the expected signal and background contributions. The “sig- nal strength” parameter (µ) multiplying the expected sig- nal yield in each bin is the parameter of interest in the fit procedure. This µ is defined as the ratio of the measured cross section normalized to the Standard Model cross sec- tion times the branching ratio for H → ττ (σ S M ). Signal

The Gamma Ray Transmission Factor of Spent Fuel

Because ofself-absorption in sample depend on a number of factors, including spentfuel composition, density, dimensions and gamma-ray energy [4]. Hence, the transmission factor was too difficult to be obtained directly from the formulas (2) and (3). In this case,the infinite energy method was considered to determine this factor.The method supposes that all gamma rays would through the fuel at infinite energy or F ∞ = 1 and the logarithm of thecount rate over branching ratio is linearly

Extension of Wavelength Range in Absolute Intensity Calibration of Space-Resolved EUV Spectrometer for LHD Diagnostics

Extreme ultraviolet (EUV) spectroscopy plays an es- sential role in the impurity diagnostics of high-temperature plasmas, since impurities are ionized into highly charge states and wavelengths emitted from such impurity ions be- come shorter. A space-resolved EUV spectrometer work- ing in wavelength range of 60-400Å has been installed in Large Helical Device (LHD) to measure radial profiles of impurity line emissions and bremsstrahlung continuum for the impurity transport study and eﬀective ion charge (Z eﬀ ) measurement, respectively [1]. For these purposes the absolute intensity calibration of the space-resolved EUV spectrometer is required. Due to a qualitative limitation of conventional methods for the absolute intensity calibration using synchrotron orbital radiation source and branching ratio technique, a new method based on the bremsstrahlung continuum measurement in EUV and visible range has been developed, and could be successfully applied to cal- ibration of the space-resolved EUV spectrometer in wave- length range of 80-400 Å [2].

Investigation of the direct-capture reaction, He^3(α,γ)Be^7

Over the entire energy region the measured total cross section and branching ratio confirm theoretical predictions based on calculati ons neglecting the contributions to t[r]

Studying η-Meson Decays with WASA-at-COSY

the relative branching ratio will be determined for the high statistics proton-proton data set, in order to decrease the statistical uncertainties and to recheck the existing results.. H[r]

A New Type of Radical Pair Based Model for Magnetoreception

b Cycle of the compass molecule: after photoexcitation from jS0i to jS1i, the branching ratio of direct relaxation into the ground state or via a long-lived triplet state jT0i depends on[r]

Very rare, exclusive, hadronic decays in QCD factorization

The case of h → Vγ is similar to the Z-boson decays, with the diﬀerence of an important additional contribution, where the Higgs decays into a pair of photons or into a photon and a Z-boson. Here, either the o ﬀ -shell photon or Z-boson converts to the ﬁnal state meson. The hγγ- and hγZ-couplings are generated at 1-loop in the SM or can occur at tree-level in our e ﬀ ective Lagrangian [22]. Generally, these “indirect” contributions are dominant over the ones that directly involve the Yukawa couplings of the valence quarks of the vector meson V . When one wants to use these decays to probe said Yukawa couplings, it is useful to normalize the branching ratios to the branching ratio of h → γγ, since all NP eﬀects in the indirect contribution will aﬀect h → γγ in the same way (up to small corrections due to the oﬀ-shellness of the photon and the Z-boson diagram). Expanding in small parameters, we ﬁnd:

New Physics Models in the Diphoton Final State at CMS

photon pairs is randomly set aside to be counted as an alternate channel. We apply a 57.8% chance that this pair should be counted as a H → b ¯ b decay channel to simulate the branching ratio [18]. Then, with every b-jet in the event, we emulate the b-tagging efficiency by randomly tagging 60% of generator level b-jets. This approximately corresponds to the efficiency of a CSV medium b-tag requirement (see Section 3.5). The reason this artificial handling of bottom quarks is necessary so we do not overestimate the number of events that would fall in the Hbb box. These box definitions are important for future inclusive analyses and will be used in the later statistical study in Section 4.11.

Luminescence studies of Sm3+ ion in LiF-MO-B2O3 (M = Ca, Cd, Ba and Pb) glasses

KEYWORDS: Alkali fluoroborate glass, JO Parameters, Emission probability, The radiative life time, Fluorescent branching ratio.. INTRODUCTION.[r]

Strong D2*(2460)0 → D+π− Transition in QCD

branching ratio of the considered transition. These are not physical parameters therefore the results of the coupling constant calculations should have no dependency on these auxiliary p[r]

Cavity Ringdown Spectroscopy, Kinetics, and Quantum Chemistry of Atmospherically Relevant Reactions

The chemical systems and techniques used are  Peroxynitrous acid HOONO—electronic structure calculations to interpret previous spectroscopic experiments on the branching ratio of OH + N[r]

Ridgeness Based Vessel Feature Detection for Endoscopic Images

The detected candidates of branching points might contain blobs, specular reflections, branching points, and spurs. This section focuses on how to further distinguish branching points from the others. The major differences are their local structure patterns. One distinctive characteristic of branching points is that they have three or four connecting vessels. Many vessel segmentation methods have been proposed and the branching points can be identiﬁed after the vessels are success fully segmented. Compare with those methods, the methods proposed in this paper have the advantage that they do not rely on any image segmentation techniques. Therefore, the proposed methods do not need to solve optimization problems required by many image segmentation methods. Inspired by FAST feature point detector , we propose to place a circle centered at each candidate point on the ridgeness image and examine the ridgeness value and intensity of each point along the circle to determine whether it is a branching point or not. For clarity, this process of using a circle is termed as Ridgness Based Circle Test (RBCT)[9].