Electron capture to positron emission ratio in the decay of 44Sc

1976 ◽  
Vol 54 (24) ◽  
pp. 2396-2402 ◽  
Author(s):  
H. Stocker ◽  
A. P. Baerg
Keyword(s):  
Electron Capture ◽  
Ground State ◽  
Present Value ◽  
Total Electron ◽  
Coincidence Technique ◽  
Total Uncertainty ◽  
Emission Ratio ◽  
Positron Emission ◽  
Measured Ratio ◽  
Good Agreement

A new measurement of the total electron capture to positron emission ratio, e/β+, for the allowed beta decay of the ground state of 44Sc has been carried out by a 4πβ–γ coincidence technique using a pressurized gas proportional 4πβ counter and a Ge(Li) γ detector. The result is 0.0497 with a standard error of 0.0023 and an estimated maximum systematic uncertainty of 0.0026. By this method, the total uncertainty in the measured ratio has been reduced by about a factor of three compared to the most accurate of earlier results. The present value of e/β+ is in good agreement with all current theoretical estimates for allowed transitions and a detailed summary of these estimates is presented.

scholarly journals Search for Double Beta Decay of 106Cd with an Enriched 106CdWO4 Crystal Scintillator in Coincidence with CdWO4 Scintillation Counters

Universe ◽  
2020 ◽  
Vol 6 (10) ◽  
pp. 182
Author(s):  
Pierluigi Belli ◽  
R. Bernabei ◽  
V.B. Brudanin ◽  
F. Cappella ◽  
V. Caracciolo ◽  
...  
Keyword(s):  
Electron Capture ◽  
Beta Decay ◽  
Ground State ◽  
Half Life ◽  
Double Beta Decay ◽  
Cadmium Tungstate ◽  
Positron Emission ◽  
Double Electron ◽  
Theoretical Predictions ◽  
Crystal Scintillator

Studies on double beta decay processes in 106Cd were performed by using a cadmium tungstate scintillator enriched in 106Cd at 66% (106CdWO4) with two CdWO4 scintillation counters (with natural Cd composition). No effect was observed in the data that accumulated over 26,033 h. New improved half-life limits were set on the different channels and modes of the 106Cd double beta decay at level of limT1/2∼1020−1022 yr. The limit for the two neutrino electron capture with positron emission in 106Cd to the ground state of 106Pd, T1/22νECβ+≥2.1×1021 yr, was set by the analysis of the 106CdWO4 data in coincidence with the energy release 511 keV in both CdWO4 counters. The sensitivity approaches the theoretical predictions for the decay half-life that are in the range T1/2∼1021−1022 yr. The resonant neutrinoless double-electron capture to the 2718 keV excited state of 106Pd is restricted at the level of T1/20ν2K≥2.9×1021 yr.

scholarly journals K-Electron-Capture-to-Positron-Emission Ratio in the Decays ofO15andNe19

1972 ◽  
Vol 6 (4) ◽  
pp. 1132-1136 ◽  
Author(s):  
W. Leiper ◽  
R. W. P. Drever
Keyword(s):  
Electron Capture ◽  
Emission Ratio ◽  
Positron Emission

VMC CALCULATIONS OF THE GROUND STATE PROPERTIES OF NUCLEAR MATTER

2005 ◽  
Vol 14 (02) ◽  
pp. 255-267 ◽  
Author(s):  
KAAN MANİSA ◽  
ÜLFET ATAV ◽  
RIZA OGUL
Keyword(s):  
Nuclear Matter ◽  
Ground State ◽  
Nucleon Nucleon ◽  
Neutron Matter ◽  
Potential Term ◽  
Ground State Properties ◽  
Dependent Potential ◽  
Variational Monte Carlo Method ◽  
Kinetic And Potential Energies ◽  
Good Agreement

A Variational Monte Carlo method (VMC) is described for the evaluation of the ground state properties of nuclear matter. Equilibrium properties of symmetric nuclear matter and neutron matter are calculated by the described VMC method. The Urbana ν14 potential is used for the nucleon–nucleon interactions in the calculations. Three- and more-body interactions are included as a density dependent potential term. Total, kinetic and potential energies per particle are obtained for nuclear and neutron matter. Pressure values of nuclear and neutron matter are also calculated at various densities. The binding energy of nuclear matter is found to be -16.06 MeV at a saturation density of 0.16 fm -3. The results obtained are in good agreement with those obtained by various authors with different potentials and techniques.

scholarly journals THE METHOD OF INCREMENTS — A WAVEFUNCTION-BASED AB-INITIO CORRELATION METHOD FOR SOLIDS

2007 ◽  
Vol 21 (13n14) ◽  
pp. 2204-2214 ◽  
Author(s):  
BEATE PAULUS
Keyword(s):  
Experimental Data ◽  
Ab Initio ◽  
Ground State ◽  
Infinite System ◽  
Correlation Energy ◽  
Correlation Method ◽  
Many Body ◽  
Hartree Fock ◽  
The Many ◽  
Good Agreement

The method of increments is a wavefunction-based ab initio correlation method for solids, which explicitly calculates the many-body wavefunction of the system. After a Hartree-Fock treatment of the infinite system the correlation energy of the solid is expanded in terms of localised orbitals or of a group of localised orbitals. The method of increments has been applied to a great variety of materials with a band gap, but in this paper the extension to metals is described. The application to solid mercury is presented, where we achieve very good agreement of the calculated ground-state properties with the experimental data.

scholarly journals Ab-initio study of electronic and magneto-optical properties of InAs:Mn

2018 ◽  
Vol 185 ◽  
pp. 06008 ◽  
Author(s):  
Elena Gan’shina ◽  
Erkin Kulatov ◽  
Leonard Golik ◽  
Zoya Kun’kova ◽  
Yurii Uspenskii ◽  
...  
Keyword(s):  
Optical Properties ◽  
Ground State ◽  
Kerr Effect ◽  
Energy Difference ◽  
Dielectric Tensor ◽  
Ab Initio Study ◽  
State Distribution ◽  
Electron Energy Loss ◽  
Electron Energy Loss Spectra ◽  
Good Agreement

Energy difference between the ferromagnetic and antiferromagnetic collinear orderings has been calculated for the uniform and dimer Mn-pair geometries in order to find the ground state distribution of the Mn atoms in InAs host. We find the preference of the dimer ferromagnetic configuration of Mn dopants and an importance of optimizing the atomic site positions. The frequency-dependent optical and magneto-optical properties, namely the dielectric tensor (on-and off-diagonal components), the electron energy loss spectra, and the transversal Kerr effect (TKE), are calculated. Calculated TKE resonance in In1-xMnxAs (x=0.0625) is found to be in good agreement with corresponding experimental magneto-optical spectra. The origin of the large TKE is discussed.

A Density Functional Study of Structures and Vibrations of Ta3O and Ta3O−

2005 ◽  
Vol 1 (4) ◽  
pp. 164-171 ◽  
Author(s):  
Patrizia Calaminici ◽  
Roberto Flores–Moreno ◽  
Andreas M. Köster
Keyword(s):  
Ground State ◽  
Photoelectron Spectroscopy ◽  
Density Functional ◽  
Equilibrium Structure ◽  
Negative Ion ◽  
Functional Study ◽  
Experimental Prediction ◽  
Extra Electron ◽  
Ground State Structures ◽  
Good Agreement

Density functional calculations of neutral and anionic tantalum trimer monoxide are presented. The calculations were performed employing scalar quasi–relativistic effective core potentials. Different isomers of Ta3O and Ta3O- were studied in order to determinethe ground state structures. For both systems a planar C2vstructure with an edge-boundoxygen atom was found as ground state. Equilibrium structure parameters, harmonic frequencies, adiabatic electron affinity and Kohn-Sham orbital diagrams are reported. The calculated values are in good agreement with the available experimental data obtained from negative ion photoelectron spectroscopy. The correlation diagram between the neutral and anionic Ta3O shows that, in agreement with the experimental prediction, the extra electron in the anionic system occupies a nonbonding orbital.

Contribution of transfer ionization to total electron capture from a helium target

1987 ◽  
Vol 36 (4) ◽  
pp. 1952-1954 ◽  
Author(s):  
J. A. Tanis ◽  
M. W. Clark ◽  
R. Price ◽  
R. E. Olson
Keyword(s):  
Electron Capture ◽  
Total Electron ◽  
Transfer Ionization ◽  
Helium Target
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