Log ASCII Standard (LAS) Files for Geophysical (Gamma Ray) Wireline Well Logs and Their Application to Geologic Cross Section C-C' Through the Central Appalachian Basin

2009 ◽  
Author(s):  
Michael H. Trippi ◽  
Robert D. Crangle
Keyword(s):  
Cross Section ◽  
Gamma Ray ◽  
Appalachian Basin ◽  
Well Logs

THE LITHO-DENSITY* LOG

1981 ◽  
Vol 21 (1) ◽  
pp. 200
Author(s):  
J. Bowler
Keyword(s):  
Bulk Density ◽  
Cross Section ◽  
Gamma Ray ◽  
Effective Atomic Number ◽  
Well Logs ◽  
Heavy Minerals ◽  
Shallow Marine ◽  
Natural Gamma ◽  
Chemical Content ◽  
Gas Bearing

The Litho-Density Log (LDT) measures a new formation parameter, Pe, the effective photoelectron cross-section. This measurement is made at the same time as the measurement of bulk density, ρb. The equipment is com bined with Gamma Ray and Compensated Neutron Loqqinq (CNL*) devices.Pe is a function of Z. the effective atomic number. The Z of a formation determines its chemical content and therefore its lithology.The effect of gas on the Pe measurement is almost neglible so it becomes a good lithology Indicator in non-shaly gas-bearing reservoirs. As a result, it provides a means for confirming porosity determinations made with corrected bulk density and CNL porosity data.The radioactive logging parameters for a number of sedimentary minerals have recently been computed. With this knowledge and the addition of the Pe measurement it is possible to discriminate between tight streaks and heavy minerals such as siderite.A number of clays, such as glauconite, may be identifiable with cross-plot methods. Knowledge of the presence of glauconite, which is thought to be formed in shallow marine waters, can be useful in establishing depositional environments.If a Natural Gamma Ray Spectroscopy (NGS*) Log is available, additional cross-plots are proposed which will enhance the identification of clay mineralsSeveral of the proposed interpretation techniques are illustrated with data from Australian and other well logs.*Mark of Schlumberger

scholarly journals Spin-one dark matter and gamma ray signals from the galactic center

2020 ◽  
Vol 2020 (8) ◽  
Author(s):  
H. Hernández-Arellano ◽  
M. Napsuciale ◽  
S. Rodríguez
Keyword(s):  
Dark Matter ◽  
Cross Section ◽  
Gamma Ray ◽  
Galactic Center ◽  
Photon Emission ◽  
Scalar Coupling ◽  
Initial State ◽  
Internal Bremsstrahlung ◽  
Resonance Effects ◽  
State Radiation

Abstract In this work we study the possibility that the gamma ray excess (GRE) at the Milky Way galactic center come from the annihilation of dark matter with a (1, 0) ⊕ (0, 1) space-time structure (spin-one dark matter, SODM). We calculate the production of prompt photons from initial state radiation, internal bremsstrahlung, final state radiation including the emission from the decay products of the μ, τ or hadronization of quarks. Next we study the delayed photon emission from the inverse Compton scattering (ICS) of electrons (produced directly or in the prompt decay of μ, τ leptons or in the hadronization of quarks produced in the annihilation of SODM) with the cosmic microwave background or starlight. All these mechanisms yield significant contributions only for Higgs resonant exchange, i.e. for M ≈ MH /2, and the results depend on the Higgs scalar coupling to SODM, gs. The dominant mechanism at the GRE bump is the prompt photon production in the hadronization of b quarks produced in $$ \overline{D}D\to \overline{b}b $$ D ¯ D → b ¯ b , whereas the delayed photon emission from the ICS of electrons coming from the hadronization of b quarks produced in the same reaction dominates at low energies (ω < 0.3 GeV ) and prompt photons from c and τ , as well as from internal bremsstrahlung, yield competitive contributions at the end point of the spectrum (ω ≥ 30 GeV ). Taking into account all these contributions, our results for photons produced in the annihilation of SODM are in good agreement with the GRE data for gs ∈ [0.98, 1.01] × 10−3 and M ∈ [62.470, 62.505] GeV . We study the consistency of the corresponding results for the dark matter relic density, the spin-independent dark matter-nucleon cross-section σp and the cross section for the annihilation of dark matter into $$ \overline{b}b $$ b ¯ b , τ+τ−, μ+μ− and γγ, taking into account the Higgs resonance effects, finding consistent results in all cases.

An investigation of effects of level density models and gamma ray strength functions on cross-section calculations for the production of 90Y, 153Sm, 169Er, 177Lu and 186Re therapeutic radioisotopes via (n,γ) reactions

2019 ◽  
Vol 108 (1) ◽  
pp. 11-17
Author(s):  
Mert Şekerci ◽  
Hasan Özdoğan ◽  
Abdullah Kaplan
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Production Cross Section ◽  
Gamma Ray ◽  
Production Cross ◽  
Level Density ◽  
Experimental Studies ◽  
Level Density Models ◽  
Strength Functions ◽  
Cancer Diseases

Abstract One of the methods used to treat different cancer diseases is the employment of therapeutic radioisotopes. Therefore, many clinical, theoretical and experimental studies are being carried out on those radioisotopes. In this study, the effects of level density models and gamma ray strength functions on the theoretical production cross-section calculations for the therapeutic radioisotopes 90Y, 153Sm, 169Er, 177Lu and 186Re in the (n,γ) route have been investigated. TALYS 1.9 code has been used by employing different level density models and gamma ray strength functions. The theoretically obtained data were compared with the experimental data taken from the literature. The results are presented graphically for better interpretation.

Revisiting the238U Thermal Capture Cross Section and Gamma-Ray Emission Probabilities from239Np Decay

2005 ◽  
Vol 150 (3) ◽  
pp. 336-348 ◽  
Author(s):  
A. Trkov ◽  
G. L. Molnár ◽  
Zs. Révay ◽  
S. F. Mughabghab ◽  
R. B. Firestone ◽  
...  
Keyword(s):  
Cross Section ◽  
Capture Cross Section ◽  
Gamma Ray ◽  
Capture Cross ◽  
Gamma Ray Emission
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