Improvements to the X-ray Spectrometer at the Aerosol Laboratory, Instituto de Física, UNAM

 

• L V Mejía-PonceInstitute of Physics, National Autonomous University of Mexico (UNAM), PO Box 20-364, 01000 Mexico City, Mexico
• A E Hernández-LópezInstitute of Physics, National Autonomous University of Mexico (UNAM), PO Box 20-364, 01000 Mexico City, Mexico
• S Reynoso-CrucesInstitute of Physics, National Autonomous University of Mexico (UNAM), PO Box 20-364, 01000 Mexico City, Mexico
• J C PinedaInstitute of Physics, National Autonomous University of Mexico (UNAM), PO Box 20-364, 01000 Mexico City, Mexico
• J A Mendoza-FloresInstitute of Physics, National Autonomous University of Mexico (UNAM), PO Box 20-364, 01000 Mexico City, Mexico
• J MirandaInstitute of Physics, National Autonomous University of Mexico (UNAM), PO Box 20-364, 01000 Mexico City, Mexico

DOI: https://doi.org/10.15415/jnp.2018.61009

Keywords: X-ray fluorescence analysis, Silicon DriftDetector SDD, chemical composition of atmospheric aerosols, Standard Reference Material 2783

Abstract

Due to the demands of better (accurate and precise) analytical results using X-ray Fluorescence (XRF) at the Aerosol Laboratory, Instituto de Física, UNAM, it was necessary to carry out improvements in instrumentation and analytical procedures in the x-ray spectrometer located in this facility. A new turbomolecular vacuum system was installed, which allows reaching the working pressure in a shorter time. Characteristic x-rays are registered with a Silicon Drift Detector, or SDD, (8 mm thick Be window, 140 eV at 5.9 keV resolution), working directly in a high-vacuum, permitting the detection of x-rays with energies as low as 1 keV (Na Ka) and higher counting rates than in the past. Due to the interference produced by the Rh L x-rays emitted by the tube normally used for atmospheric and food analysis with Cl K x-rays, another tube with a W anode was mounted in the spectrometer to avoid this interference, with the possibility to select operation with any of these tubes. Examples of applications in atmospheric aerosols and other samples are presented, to demonstrate the enhanced function of the spectrometer. Other future modifications are also explained.

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Issue

Vol 6 No 1 (2018)

How to Cite

L V Mejía-Ponce; A E Hernández-López; S Reynoso-Cruces; J C Pineda; J A Mendoza-Flores; J Miranda. Improvements to the X-Ray Spectrometer at the Aerosol Laboratory, Instituto De Física, UNAM. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 57-60.

Jung’s Theorem Applied in Nuclear Track Methodology

 

• G. ChacinSimon Bolivar University. Physics Department. Caracas 1080A Venezuela
• L. Sajo-BohusSimon Bolivar University. Physics Department. Caracas 1080A Venezuela
• J.J. Rojas HanccoDepartment of Physics, Pontifical Catholic University of Peru, Lima, Peru
• G. EspinosaInstitute of Physics, National Autonomous University of Mexico (UNAM), 04520 Mexico City

DOI: https://doi.org/10.15415/jnp.2018.61008

Keywords: Nuclear track density, cr-39 detectors, beam diagnostics, charged particle sources

Abstract

Nuclear track density provides accelerator beam imaging and diagnostic employing CR-39 passive detectors. Counting charged particles related tracks by automated reading systems depend on the accuracy of microscope field view other that chemical etching procedure and frequency of overlapped tracks. The study, to propose a method to determined track density for analyser optical field view not calibrated. The approach Jungs’ theorem, provides the area value based on the maximum distance for two selected etched tracks. Results show that the new method has its importance when microscope field view calibration is not available with precision for accelerator beam diagnostics.

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Issue

Vol 6 No 1 (2018)

How to Cite

G. Chacin; L. Sajo-Bohus; J.J. Rojas Hancco; G. Espinosa. Jung’s Theorem Applied in Nuclear Track Methodology. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 51-55.

Temperature Effects in the Composition of Metal Halide Perovskite thin Films

 

• M. Castro-ColinBruker AXS, Karlsruhe, Germany
• L. BanuelosDept. of Physics, U. of Texas at El Paso, El Paso, TX, USA
• C. Diaz-MorenoDept. of Physics, U. of Texas at El Paso, El Paso, TX, USA
• D. HodgesElectrical and Computer Eng. Dept., U. of Texas at El Paso, El Paso, TX, USA
• E. Ramirez-HomsDept. of Physics, U. of Texas at El Paso, El Paso, TX, USA
• D. KorolkovBruker AXS, Karlsruhe, Germany
• N. SharminDept. of Physics, U. of Texas at El Paso, El Paso, TX, USA
• J. A. LopezDept. of Physics, U. of Texas at El Paso, El Paso, TX, USA

DOI: https://doi.org/10.15415/jnp.2018.61007

Keywords: Perovskites, Photovoltaic, Energy Conversion, X-ray Reflectivity, X-ray Fluorescence

Abstract

Metal halide perovskites have shown to be a structure with great promise as an efficient photovoltaic, but at the same time it is affected by instability problems that degrade their performance. Degradation mechanisms vary with temperature, moisture, oxidation, and energy conversion during light exposure. We study performance loss due to temperature by probing diffusion of elemental composition across the thickness of films produced by spin coating and for temperatures ranging from 20 to 200°C. X-ray reflectivity was used to identify the electron density, composition, and quality of the films, aided with X-ray fluorescence and X-ray photoelectron spectroscopy studies to obtain information about degradation of the organic phase of the films.

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Issue

Vol 6 No 1 (2018)

How to Cite

M. Castro-Colin; L. Banuelos; C. Diaz-Moreno; D. Hodges; E. Ramirez-Homs; D. Korolkov; N. Sharmin; J. A. Lopez. Temperature Effects in the Composition of Metal Halide Perovskite Thin Films. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 39-49.

Annihilation of Dipolar Dark Matter: χχ→γγ

 

• E. Barradas-GuevaraFaculty of Physical Mathematical Sciences, Meritorious Autonomous University of Puebla (BUAP), PO Box 1152, Puebla 72000, Mexico
• J. L. Díaz-CruzFaculty of Physical Mathematical Sciences, Meritorious Autonomous University of Puebla (BUAP), PO Box 1152, Puebla 72000, Mexico
• O. G. Félix BeltránFaculty of Electronics Sciences, Meritorious Autonomous University of Puebla (BUAP), PO Box 542, Puebla 72000, Mexico
• C. Arellano CelizFaculty of Physical Mathematical Sciences, Meritorious Autonomous University of Puebla (BUAP), PO Box 1152, Puebla 72000, Mexico

DOI: https://doi.org/10.15415/jnp.2018.61006

Keywords: dark matter annihilation, dipolar dark matter, gamma-ray signatures, annihilation cross section, relic density

Abstract

In this work we study the annihilation of dark matter, considering it as a neutral particle with magnetic and/or electric moments not null. The calculation of the effective section of the process χχbar→γγ is made starting from a general form of coupling χ χbar γ in the framework of an extension of the Standard Model. We found, when taking into account an annihilation of DDM-antiDDM to monoenergetic photons, that for small masses, mχ ≤ 0 GeV, an electric dipole moment ~10–6 e cm is required to satisfy the current residual density, while for the range of greater sensitivity of HAWC, 10 TeV < Eg < 20 TeV, the electrical dipole moment must be of the order of 10–8 e cm.

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Issue

Vol 6 No 1 (2018)

How to Cite

E. Barradas-Guevara; J. L. Díaz-Cruz; O. G. Félix Beltrán; C. Arellano Celiz. Annihilation of Dipolar Dark Matter: χχ→γγ. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 33-38.

Dependence on the Identification of the Scale Energy Parameter Q 2 in the Quark Distribution Functions for a DIS Production of Za

 

• M. Gómez-BockInstitute of Physics, Meritorious Autonomous University of Puebla (BUAP), PO Box J-48, 52570 Puebla, Mexico.
• W. GonzalezInstitute of Physics, Meritorious Autonomous University of Puebla (BUAP), PO Box J-48, 52570 Puebla, Mexico.
• L. López LozanoAcademic area of Mathematics and Physics. Hidalgo State Autonomous University. Kilometer 4.5 Pachuca-Tulancingo highway. 42184 Pachuca, Hidalgo. México.
• S. Rosado-NavarroFaculty of Physical Mathematical Sciences, Meritorious Autonomous University of Puebla (BUAP), PO Box 1364, 72000 Puebla, Mexico.
• A. RosadoInstitute of Physics, Meritorious Autonomous University of Puebla (BUAP), PO Box J-48, 52570 Puebla, Mexico.

DOI: https://doi.org/10.15415/jnp.2018.61005

Keywords: Bosonic Production, Deep inelastic scattering, Momentum Transferred, Parton Distribution Function, Parton Model

Abstract

We discuss the Z-production in a DIS (Deep Inelastic Scattering) process e + p → e + Z + X using the Parton Model, within the context of the Standard Model. In contrast with deep inelastic eP-scattering (e + p → e + X), where the choice of Q2, as the transferred momentum squared, is unambiguous; whereas in the case of boson production, the transferred momentum squared, at quark level, depends on the reaction mechanism (where is the EW interaction taking place). We suggest a proposal based on the kinematics of the process considered and the usual criterion for Q2, which leads to a simple and practical prescription to calculate Z-production via ep-DIS. We also introduce different options in order o perform the convolution of the Parton distribution functions (PDFs) and the scattering amplitude of the quark processes. Our aim in this work is to analyze and show how large could be the dependence of the total cross-section rates on different possible prescriptions used for the identification of the scale energy parameter Q2. We present results for the total cross-section as a function of the total energy √s of the system ep, in the range 300 <√s ≤ 1300 GeV.

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Issue

Vol 6 No 1 (2018)

How to Cite

M. Gómez-Bock; W. Gonzalez; L. López Lozano; S. Rosado-Navarro; A. Rosado. Dependence on the Identification of the Scale Energy Parameter Q 2 in the Quark Distribution Functions for a DIS Production of Za. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 27-32.

Signal of h → µτ, ττ in ν2HDM⊕S3

 

• E Barradas GuevaraFaculty of Physical Mathematical Sciences, Meritorious Autonomous University of Puebla (BUAP), PO Box 1152, Puebla 72000, Mexico
• F. Cazarez-BushInstitute of Mathematics, National Autonomous University of Mexico (UNAM), PO Box 139-B 6219, 04510 Mexico City. Mexico
• O. Felix Beltran5Faculty of Electronics Sciences, Meritorious Autonomous University of Puebla (BUAP), PO Box 542, Puebla 72000, Mexico
• F. Gonzalez-CanalesInstitute of Mathematics, National Autonomous University of Mexico (UNAM), PO Box 139-B 6219, 04510 Mexico City. Mexico

DOI: https://doi.org/10.15415/jnp.2018.61004

Keywords: Leptons, Seesaw mechanism, flavour symmetry, 2HDM-III

Abstract

Nowadays in particle physics, the exploration of the flavor physics through the Higgs boson phenomenology is one of the main goals in the field. In particular we are interested in the Lepton Flavour Violation (LFV) processes. In this work, we explore the processes h → µτ, ττ in the theoretical framework of a flavored extension of the Standard Model, which has two Higgs fields and the horizontal permutation symmetry S3 imposed in the Yukawa sector, this extension is called v2HDM⊗S3.We obtain the couplings Φµτ, ττ as well as Br(h → µτ) in function of the model parameters in function of the model parameters, which are constricted by means the experimental results of  ΦMS → µτ reported in the literature.

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Issue

Vol 6 No 1 (2018)

How to Cite

E Barradas Guevara; F. Cazarez-Bush; O. Felix Beltran; F. Gonzalez-Canales. Signal of H → µτ, ττ in ν2HDM⊕S3. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 23-26.

Spontaneous CP Violation Jarlskog Invariant in SM ⊗ S3

 

• J. Montano-PerazaFaculty of Electronics Sciences, Meritorious Autonomous University of Puebla (BUAP), PO Box 542, Puebla 72000, Mexico
• E. Barradas-GuevaraDepartment of Physics Investigation, University of Sonora, PO Box 1626, 83000 Hermosillo, Sonora. México
• O. Felix-BeltranFaculty of Physical Mathematical Sciences, Meritorious Autonomous University of Puebla (BUAP), PO Box 1152, Puebla 72000, Mexico
• E. Rodriguez-JaureguiDepartment of Physics, University of Sonora, PO Box 1626, 83000 Hermosillo, Sonora. México

DOI: https://doi.org/10.15415/jnp.2018.61003

Keywords: CP violation, Jarlskog invariant, S3 Symmetry

Abstract

In our days, CP (Charge Parity) violation in the Standar Model of fundamental interactions still remains as an open problem. It is well known that explicit CP violation may be included by impossing complex Yukawa couplings in the Yukawa sector or complex Higgs couplings in exttended Higgs sectors with more than one Higgs field. It is desirable to have a fundamental CP violation theory, in that sence, we analyse the diferent secenarios for Spontaneous CP violation in an exteded Higgs model with three Higgs fields and a discrete flavour permutational symmetry S3. Spontaneous CP violation effects contribute to the Higgs mass matrix, as well as, up and down quark mass matrices. This complex quark mass matrices allow us to study the conditions for a non-vanishing Jarlskog invariant J which provides a necessary and sufficient contribution for a spontaneous CPV coming from SM ⊗ S3.

References

Barradas-Guevara, E., Felix-Beltran, O., RodriguezJauregui, E., (2014). Trilinear selfcouplings in an S(3) flavored Higgs model. Phys. Rev., D90(9):095001. https://doi.org/10.1103/PhysRevD.90.095001

Barradas-Guevara, E., Felix-Beltran, O., RodriguezJauregui, E., (2016). Doi:10.15415/jnp.2016.41022, https://doi.org/10.15415/jnp.2016.41022

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Issue

Vol 6 No 1 (2018)

How to Cite

J. Montano-Peraza; E. Barradas-Guevara; O. Felix-Beltran; E. Rodriguez-Jauregui. Spontaneous CP Violation Jarlskog Invariant in SM ⊗ S3. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 17-21.

Redistribution of Nickel Ions Embedded within Indium Phosphide Via Low Energy Dual Ion Implantations

 

• Daniel C. JonesIon Beam Modification and Analysis Laboratory, Department of Physics, University of North Texas, Denton, Texas 76203, USA
• Joshua M. YoungIon Beam Modification and Analysis Laboratory, Department of Physics, University of North Texas, Denton, Texas 76203, USA
• Wickramaarachchige J. LakshanthaIon Beam Modification and Analysis Laboratory, Department of Physics, University of North Texas, Denton, Texas 76203, USA
• Satyabrata SinghIon Beam Modification and Analysis Laboratory, Department of Physics, University of North Texas, Denton, Texas 76203, USA
• Todd A. ByersIon Beam Modification and Analysis Laboratory, Department of Physics, University of North Texas, Denton, Texas 76203, USA
• Duncan L. WeathersIon Beam Modification and Analysis Laboratory, Department of Physics, University of North Texas, Denton, Texas 76203, USA
• Floyd D. McDanielIon Beam Modification and Analysis Laboratory, Department of Physics, University of North Texas, Denton, Texas 76203, USA
• Bibhudutta RoutIon Beam Modification and Analysis Laboratory, Department of Physics, University of North Texas, Denton, Texas 76203, USA

DOI: https://doi.org/10.15415/jnp.2018.61002

Keywords: InP based optoelectronics devices, Ni nanoclusters, Dual Ion Implantations, Rutherford Backscattering, X-ray Photoelectron Spectroscopy

Abstract

Transition-metal doped Indium Phosphide (InP) has been studied over several decades for utilization in optoelectronics applications. Recently, interesting magnetic properties have been reported for metal clusters formed at different depths surrounded by a high quality InP lattice. In this work, we have reported accumulation of Ni atoms at various depths in InP via implantation of Ni- followed by H– and subsequently thermal annealing. Prior to the ion implantations, the ion implant depth profile was simulated using an ion-solid interaction code SDTrimSP, incorporating dynamic changes in the target matrix during ion implantation. Initially, 50 keV Ni- ions are implanted with a fluence of 2 × 1015 atoms cm-2, with a simulated peak deposition profile approximately 42 nm from the surface. 50 keV H- ions are then implanted with a fluence of 1.5 × 1016 atoms cm-2. The simulation result indicates that the H- creates damages with a peak defect center ~400 nm below the sample surface. The sample has been annealed at 50°C in an Ar rich environment for approximately 1hr. During the annealing, H vacates the lattice, and the formed nano-cavities act as trapping sites and a gettering effect for Ni diffusion into the substrate. The distribution of Ni atoms in InP samples are estimated by utilizing Rutherford Backscattering Spectrometry and X-ray Photoelectron Spectroscopy based depth profiling while sputtering the sample with Ar-ion beams. In the sample annealed after H implantation, the Ni was found to migrate to deeper depths of 125 nm than the initial end of range of 70 nm.

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Issue

Vol 6 No 1 (2018)

How to Cite

Daniel C. Jones; Joshua M. Young; Wickramaarachchige J. Lakshantha; Satyabrata Singh; Todd A. Byers; Duncan L. Weathers; Floyd D. McDaniel; Bibhudutta Rout. Redistribution of Nickel Ions Embedded Within Indium Phosphide Via Low Energy Dual Ion Implantations. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 9-15.

Radon in Workplaces the Urgent Need of New Measurements and Devices

 

• L TommasinoNational Energy for Environmental Protection (Retired) Via Cassia 1727, Roma, Italy.
• G EspinosaInstitute of Physics, National Autonomous University of Mexico (UNAM), 04520 Mexico City, Mexico

DOI: https://doi.org/10.15415/jnp.2018.61001

Keywords: Radon in workplaces, personnel neutron dosimetry, radon film badges, radon risk assessment

Abstract

The existing passive radon monitors, their relative calibration facilities together with the past intercomparison exercises have been mission-oriented towards radon measurements in dwellings. These monitors have been successfully applied throughout the world for radon measurements in homes, characterized by temperatures in the range from 20 to 25°C and a relative humidity less than 50 R.H. A multitude of different problems may arise when these passive monitors are used in environment other than homes, such as in soil and in workplaces, where large humidity up to 100 RH and temperatures anywhere from 0°C to 40°C may be encountered. Under severe environmental conditions, different measurement errors may occur which have remained concealed to date. These errors may be caused by a drastic change of both the radon diffusivity through the and for the monitor housing respectively. permeation membranes or the radon absorption by the plastics, used for the track detector. For the compliance to the assessment of the occupational exposures, it is necessary to eliminate all the possible sources of errors, which may be conducive to litigation. Another important shortcoming of the existing passive monitors is the difficult to turn them on/off daily, as required for radon measurements in workplaces. Finally, most of the problems, listed above, can be solved by the exploitation of a new generation of passive monitors, known as Rn film-badges. These monitors are similar and often identical to neutron film-badges, which have proved to be very successful throughout the world for the personnel neutron dosimetry. In particular, the present paper will describe the unique characteristics of these radon film badges, such as compactness, fast time response, any desired response sensitivity, simplicity in turning them on and off, etc.

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Issue

Vol 6 No 1 (2018)

How to Cite

L Tommasino; G Espinosa. Radon in Workplaces the Urgent Need of New Measurements and Devices. J. Nucl. Phy. Mat. Sci. Rad. A. 2018, 6, 1-7.