Double Deeply Virtual Compton Scattering (DDVCS) is the only experimental channel for the determination of the dependence of the Generalized Parton Distributions (GPDs) on both the average and the ...transferred momentum independently. The physics observables of the electron induced di-muon production reaction
e
→
±
p
→
e
±
p
μ
+
μ
-
off unpolarized hydrogen are discussed. Their measurement with the high luminosity and large acceptance SoLID spectrometer at the Thomas Jefferson National Accelerator Facility, using polarized and unpolarized positron and electron beams at 11 GeV is investigated. This experimental configuration is shown to provide unprecedented access to the GPDs with the determination of the real and imaginary parts of the Compton Form Factor
H
in an unexplored phase space, and to enable an exploratory investigation of higher twist effects.
A set of measurements have been carried out in order to determine the activity-levels in some powdered milks available in Tunisia. The study has shown that the average activity is about 160 ± 19 and ...2.26 ± 0.5 Bq/kg respectively for
40
K and
137
Cs, whereas it is below the detection limit for
226
Ra and
232
Th. The mean annual ingestion dose is about 102 and 225
μ
Sv
/
y
for respectively ≤ 1 year and 1–2 years old infants. The calculation of the radiological risk show that no significant threat on the infant’s health due to consumption of these milks.
The momentum dependence of the vertical intensity of atmospheric muons has been measured for the first time in Tunisia (region of Monastir: 35.76 N, 10.81 E) at the ground level. The measurements ...were conducted using a variable thickness of a lead layer placed between two NaI(Tl) scintillators allowing a selection of muons with a minimal momentum ranging from 0.3 to 1.4 GeV/c. The number of detected muons and the corresponding vertical intensity were carefully evaluated exploiting the deposited energy spectrum in the scintillators and a Monte-Carlo simulation of the experimental setup. The comparison of our results to previous measurements is satisfactory and compatible with the geomagnetic latitude dependence of the muon flux. The present measurements could improve the modelization of cosmic ray intensity at sea level by filling the lack of experimental data in North Africa.
The article aims to analyze, evaluate, and improve solutions for the integration of hybrid energy sources (Solar Photovoltaic PV/Batteries/Diesel Generator (DG)) in mobile service units (MSU), ...designed to provide services to rural populations (drug delivery, vaccination, training, employment promotion, bank, laboratory, etc.). The first objective is to evaluate the performance of two already deployed photovoltaic systems installed on the roofs of trucks, with respective powers of 2.12 and 3.54 kWp. Solar production, consumption, and SOC (State of Charge) of batteries are collected and analyzed. We modelled the energy conversion chain and simulated its behavior on all days of the year. Simulated results are then compared to the on-site measurements. Several association scenarios (PV/batteries) are then studied to propose the optimal combination, taking into account the surface offered for the installation of the PV modules (roof of the truck), the weight, and the lifespan of the batteries. The developed and deployed solution proposes more advantageous association scenarios (PV/Storage), and reduces the time of recourse to the DG. From this perspective, we simulated the operation of the hybrid system for the three battery capacities: 40,000, 31,680, and 19,200 Wh (~1667, 1320, and 800 Ah). The results reveal that the uncaptured energy for a 3540 Wp field is five times greater than that of a 2120 Wp field. On the other hand, the number of battery charge/discharge cycles is divided by ten. Doi: 10.28991/CEJ-2022-08-07-07 Full Text: PDF
The all-electron full-potential linearized augmented plane-wave method is used to show that the variation of tetragonality of the L10 MnPt antiferromagnet switches the magnetization from an easy axis ...to an easy plane. The optimum lattice parameters are obtained and the changing from inplane to out-of plane is explained by a competition between the strong spin orbit coupling and weak magnetization of Pt with the large magnetization and weak spin–orbit coupling of Mn. Finally we present the X-ray magnetic linear dichroism used to investigate the magnetic anisotropy of the antiferromagnet MnPt.
•Structure, structural stability, dynamical properties and the phonon spectra of L10 MnPt.•Orbital and spin projected band structure and magnetic properties of Antiferromagnet MnPt.•Magnetocrystalline anisotropy as a competition between Mn and Pt atomic contribution.•Magnetocrystalline anisotropy can be tuned by strain.•XMLD as tool to investigate magnetism in L10 ordered antiferromagnetic MnPt.
In this paper, we present deeply virtual $\pi^0$ electroproduction cross-section measurements at $x_B$=0.36 and three different $Q^2$ values ranging from 1.5 to 2 GeV$^2$, obtained from Jefferson Lab ...Hall A experiment E07-007. The Rosenbluth technique is used to separate the longitudinal and transverse responses. Results demonstrate that the cross section is dominated by its transverse component and, thus, is far from the asymptotic limit predicted by perturbative quantum chromodynamics. Nonetheless, an indication of a nonzero longitudinal contribution is provided by the measured interference term $\sigma_{LT}$. Results are compared with several models based on the leading-twist approach of generalized parton distributions (GPDs). In particular, a fair agreement is obtained with models in which the scattering amplitude includes convolution terms of chiral-odd (transversity) GPDs of the nucleon with the twist-3 pion distribution amplitude. Finally, this experiment, together with previous extensive unseparated measurements, provides strong support to the exciting idea that transversity GPDs can be accessed via neutral pion electroproduction in the high-Q2 regime.
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