Mössbauer emission spectrum of 121Sb after the β− decay of 121mSn in SnS2: Nuclear decay synthesis of antimony (V) sulfide

1975 ◽  
Vol 63 (9) ◽  
pp. 4077 ◽  
Author(s):  
S. Ambe ◽  
F. Ambe
Keyword(s):  
Emission Spectrum ◽  
Nuclear Decay ◽  
Β Decay

scholarly journals The PANDORA project: an experimental setup for measuring in-plasma β-decays of astrophysical interest

2020 ◽  
Vol 227 ◽  
pp. 01013
Author(s):  
David Mascali ◽  
Maurizio Busso ◽  
Alberto Mengoni ◽  
Simone Amaducci ◽  
Castro Giuseppe ◽  
...  
Keyword(s):  
Nuclear Astrophysics ◽  
Charge State Distribution ◽  
Decay Rates ◽  
Nuclear Decay ◽  
Early Solar System ◽  
State Distribution ◽  
Β Decay ◽  
Plasma Trap ◽  
First Time ◽  
Magnetic Plasma

Experiments performed on Storage Rings have shown that lifetimes of beta-radionuclides can change dramatically as a function of theionization state. PANDORA (Plasmas for Astrophysics, Nuclear Decay Observation and Radiation for Archaeometry) aims at measuring, for the first time, nuclear β-decay rates in stellar-like conditions, especially for radionuclides involved in nuclear-astrophysics processes (BBN, s- processing, CosmoChronometers, Early Solar System formation). Compact magnetic plasma traps, where plasmas reach density ne~10n-1014 cm-3, and temperature Te~0.1-30 keV, are suitable for such studies. The decay rates can be measured as a function of the charge state distribution of the inplasma ions. The collaboration is now designing the plasma trap able to reach the needed plasma densities, temperatures and charge states distributions. A first list of radioisotopes, including tens of physics cases of potential interest is now available. Possible physics cases include, among the others, 2°4Tl, 63Ni, 6°Co, 171Tm, 147Pm, 85Kr, 176Lu and the pairs 187Re-187Os and 87Sr-87Rb, which play a crucial role as cosmo-clock. Physics cases are now under evaluation in terms of lifetime measurements feasibility in a plasma trap.

Dynamics of nuclear recoil: QM-MD simulations ofmodel systems following β-decay

2021 ◽  
Author(s):  
Rasmus Fromsejer ◽  
Kurt V Mikkelsen ◽  
Lars Hemmingsen
Keyword(s):  
Daughter Nucleus ◽  
Md Simulations ◽  
Nuclear Recoil ◽  
Recoil Energy ◽  
Nuclear Decay ◽  
Β Decay ◽  
Chemical Systems

The kinetic recoil energy received by the daughter nucleus in a nuclear decay is often large enough to affect the structure around the nucleus in chemical systems. The coinciding element change...

Models of Thermodynamic Properties of Prominences

1979 ◽  
Vol 44 ◽  
pp. 349-355
Author(s):  
R.W. Milkey
Keyword(s):  
Thermodynamic Properties ◽  
Mass Transport ◽  
Emission Spectrum ◽  
Thermodynamic Parameters ◽  
Working Group ◽  
Physical Processes ◽  
Theoretical Concepts ◽  
Group 3 ◽  
Observational Techniques

The focus of discussion in Working Group 3 was on the Thermodynamic Properties as determined spectroscopically, including the observational techniques and the theoretical modeling of physical processes responsible for the emission spectrum. Recent advances in observational techniques and theoretical concepts make this discussion particularly timely. It is wise to remember that the determination of thermodynamic parameters is not an end in itself and that these are interesting chiefly for what they can tell us about the energetics and mass transport in prominences.

Assessment of the volume activity of α-radioactive wastes on surface and specific contamination by portable γ-spectrometry method

2020 ◽  
pp. 468-473
Author(s):  
I. P. Korenkov ◽  
A. I. Ermakov ◽  
A. B. Mayzik ◽  
T. N. Laschenova ◽  
V. N. Klochkov ◽  
...  
Keyword(s):  
Specific Activity ◽  
Experimental Studies ◽  
Germanium Detector ◽  
Low Energy ◽  
Gamma Ray Spectrometry ◽  
Building Structures ◽  
Germanium Detectors ◽  
Volume Activity ◽  
Β Decay ◽  
Γ Spectrometry

The aim of the study is to evaluate the volume activity of radioactive waste (RW) by surface and specific alpha contamination using portable gamma-spectrometry.Materials and methods. Methods of rapid assessment of the content of α-emitting radionuclides in solid waste of various morphologies using gamma-spectrometers based on germanium detectors are considered. Computational methods for determining the effectiveness of radionuclide registration are presented.Results. The possibility of using portable gamma-ray spectrometry to assess the surface and specific activity of various materials contaminated with α-emitters (232Th, 235U, 238U, 237Np, 239Pu, 240Pu and 241Am) is shown. The calculated values of the registration efficiency of low-energy gamma-emitters obtained by modeling the spatial-energy parameters of the detector are given.To simplify the solution of this problem, the calculation program used 20 standard templates of various geometries (rectangular, cylindrical, conical, spherical, etc.). The main sources of error in the survey of contaminated surfaces, largesized equipment and building structures were investigated.Conclusions. The possibilities of portable γ-spectrometry for estimating the volume of RW based on the surface density of contamination of materials with radionuclides of uranium and transuranic elements are investigated. When using γ-spectrometer with a high-purity germanium detector with a range of γ-quanta extended in the low-energy region, radionuclides such as 232Th, 235U,238U, 237Np, 241Am were determined by their own radiation or by the radiation of their daughter products.The “problem” element is plutonium, for rapid evaluation of which it is proposed, in accordance with the radionuclide vector methodology, to use 241Am, which accumulates during the β-decay of 241Pu.According to calculations, the most likely value of the activity ratio 239Pu/241Am for the object where the work was performed (scaling factor) varies in the range from 5.0 to 9.0.Based on the results of calculations and experimental studies, the parameters of the efficiency of registration of various α-emitting radionuclides by portable γ-spectrometers. It has been found that for germanium detectors with an absolute efficiency of registering a point source of 7÷15%, it is n×10–5÷n×10–4%.

Investigation of bound state β− decay half-lives of bare atoms

2021 ◽  
Vol 104 (2) ◽  
Author(s):  
Shuo Liu ◽  
Chao Gao ◽  
Chang Xu
Keyword(s):  
Bound State ◽  
Β Decay

scholarly journals Spontaneous Emission Spectrum of a WS2 Monolayer under Strong Coupling Conditions

2020 ◽  
Vol 4 (1) ◽  
pp. 9
Author(s):  
Vasilios Karanikolas ◽  
Ioannis Thanopulos ◽  
Emmanuel Paspalakis
Keyword(s):  
Emission Spectrum ◽  
Strong Coupling ◽  
Spontaneous Emission ◽  
Two Dimensional ◽  
Spontaneous Emission Spectrum ◽  
Light Confinement ◽  
Coupling Conditions ◽  
Two Dimensional Materials ◽  
All Optical ◽  
Ws2 Monolayer

Two-dimensional materials allow for extreme light confinement, thus becoming important candidates for all optical application platforms.  [...]

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