Ψηφιοποίηση και ενοποίηση γεωλογικών σχηματισμών ενοτήτων Πελαγονικής και Μαλιακής

Η εργασία αυτή αποτελεί τμήμα μιας ολοκληρωμένης προσπάθειας με σκοπό την ενοποίηση των γεωλογικών σχηματισμών ανά γεωτεκτονική ενότητα του Ελλαδικού χώρου και αφορά τις ενότητες Πελαγονικής και Μαλιακής. Η ενοποίηση των γεωλογικών σχηματισμών βασίστηκε στους γεωλογικούς χάρτες του Ινστιτούτου Γεωλογικών και Μεταλλευτικών Ερευνών (Κλίμακα 1:50.000), που υφίστανται σε αναλογική μορφή, οι οποίοι στην συνέχεια ψηφιοποιήθηκαν με την βοήθεια του Συστήματος Γεωγραφικών Πληροφοριών ArcGIS (ESRI). Λόγω της ανομοιογένειας κατά την κατασκευή τους, τόσο σε διαφορετικές χρονικές περιόδους, όσο και από διαφορετικούς ερευνητές κρίθηκε επιτακτική η ανάγκη επανεπεξεργασίας τους για την δημιουργία ενός ενιαίου ψηφιακού γεωλογικού χάρτη. Με τη χρήση του Συστήματος Γεωγραφικών Πληροφοριών, διακρίθηκαν οι γεωτεκτονικές ενότητες με τους σχηματισμούς τους, και στη συνέχεια ομαδοποιήθηκαν, κωδικοποιήθηκαν και αποτυπώθηκαν χρωματικά με την χρήση της Ευρωπαϊκής Γεωβάσης Inspire για την ηλικία, και την παλέτα συμβόλων της Αμερικάνικης Γεωλογικής Εταιρίας (USGS) για τη λιθολογία, δημιουργώντας έτσι μια εμπλουτισμένη βάση δεδομένων, η οποία είναι δυνατόν να δεχθεί και περαιτέρω επεξεργασία. Τέλος, δημιουργήθηκε μία νέα παλέτα συμβόλων για κάθε γεωλογικό σχηματισμό, έτσι ώστε να μπορεί να χρησιμοποιηθεί αυτούσια από τους ερευνητές – μελετητές.This work is part of an integrated effort to unify the geological formations according to the Geotectonic Unit of Greece and concerns the Pelagonian and Maliac Units. The integration of geological formations was based on geological maps of IGME (Scale 1:50.000), which exist in analog form, which were subsequently digitized with the help of the ArcGIS (ESRI) Geographical Information System. Because of the heterogeneity in their construction, both at different times and by different researchers, it was considered imperative to reprocess them to create a single digital geological map. With the use of the Geographic Information System, geotechnical units were identified with their formations, then grouped, encoded and color-coded using the European Geospatial Inspire for Geological Age, and the United States Geological Survey (USGS) symbol palette for lithology, thus creating an enriched database that can be further processed. Finally, a new palette of symbols was created for each geological formation, so that it could be used in the same way by researchers - scholars

Proton Unbound States in T=3/2 and T=2 Nuclei and the Reaction Rates for Sequential Two-proton Capture Reactions in the rp-Process

This research was sponsored by the National Science Foundation Grant NSF PHY-931478

Measurement of the Transverse-Longitudinal Cross Sections in the p (e,e'p)pi0 Reaction in the Delta Region

Accurate measurements of the p(e,e?p)pi0 reaction were performed at Q^2=0.127(GeV/c)^2 in the Delta resonance energy region. The experiments at the MIT-Bates Linear Accelerator used an 820 MeV polarized electron beam with the out of plane magnetic spectrometer system (OOPS). In this paper we report the first simultaneous determination of both the TL and TL? (``fifth" or polarized) cross sections at low Q^{2} where the pion cloud contribution dominates the quadrupole amplitudes (E2 and C2). The real and imaginary parts of the transverse-longitudinal cross section provide both a sensitive determination of the Coulomb quadrupole amplitude and a test of reaction calculations. Comparisons with model calculations are presented. The empirical MAID calculation gives the best overall agreement with this accurate data. The parameters of this model for the values of the resonant multipoles are |M_{1+}(I=3/2)|= (40.9 \pm 0.3)10^{-3}/m_pi, CMR= C2/M1= -6.5 \pm 0.3%, EMR=E2/M1=-2.2 \pm 0.9%, where the errors are due to the experimental uncertainties.Comment: 10 pages, 3 figures, minor corrections and addition

Relativistic effects and two-body currents in 2H(e⃗,e′p)n^{2}H(\vec{e},e^{\prime}p)n using out-of-plane detection

Measurements of the ${^2}H(\vec{e},e^{\prime}p)n$ reaction were performed using an 800-MeV polarized electron beam at the MIT-Bates Linear Accelerator and with the out-of-plane magnetic spectrometers (OOPS). The longitudinal-transverse, $f_{LT}$ and $f_{LT}^{\prime}$, and the transverse-transverse, $f_{TT}$, interference responses at a missing momentum of 210 MeV/c were simultaneously extracted in the dip region at Q$^2$=0.15 (GeV/c)$^2$. On comparison to models of deuteron electrodisintegration, the data clearly reveal strong effects of relativity and final-state interactions, and the importance of the two-body meson-exchange currents and isobar configurations. We demonstrate that these effects can be disentangled and studied by extracting the interference response functions using the novel out-of-plane technique.Comment: 4 pages, 4 figures, and submitted to PRL for publicatio

Measurement of the RLT_{LT} response function for π0\pi^0 electroproduction at Q2Q^2 = 0.070 (GeV/c)2^2 in the N→ΔN\to\Delta transition}

Quadrupole amplitudes in the $\gamma^{*}N\to\Delta$ transition are associated with the issue of nucleon deformation. A search for these small amplitudes has been the focus of a series of measurements undertaken at Bates/MIT by the OOPS collaboration. We report on results from H$(e,e^\prime p)\pi^0$ data obtained at $Q^2= 0.070$ (GeV/c)$^2$ and invariant mass of W=1155 MeV using the out-of-plane detection technique with the OOPS spectrometers. The $\sigma_{LT}$ and $\sigma_{T}+\epsilon\cdot$ $\sigma_{L}$ response functions were isolated. These results, along with those of previous measurements at $W$=1172 MeV and $Q^2= 0.127$ (GeV/c)$^2$, aim in elucidating the interplay between resonant and non resonant amplitudes

Recent Measurements of gamma*N -> Delta Response Functions at Bates

A series of high precision measurements on the N ->Delta transition involving polarized beams, out-of-plane detection and focal plane polarimetry in the H((e) over bar, e’p)pi(0) and H((e) over bar, e’pi(+))n channels have been pursued at Bates during the last three years. They are geared towards the precise determination of the quadrupole amplitudes in the N -> Delta transition and the isolation of the coherent, competing processes at low Q(2)

RESONEUT: A detector system for spectroscopy with (d,n) reactions in inverse kinematics

The RESONEUT detector setup is described, which was developed for resonance spectroscopy using (d,n) reactions with radioactive beams in inverse kinematics and at energies around the Coulomb barrier. The goal of experiments with this setup is to determine the spectrum and proton-transfer strengths of the low-lying resonances, which have an impact on astrophysical reaction rates. The setup is optimized for l=0 proton transfers in inverse kinematics, for which most neutrons are emitted at backward angles with energies in the 80–300 keV range. The detector system is comprised of 9 p-terphenyl scintillators as neutron detectors, two annular silicon-strip detectors for light charged particles, one position-resolving gas ionization chamber for heavy ion detection, and a barrel of NaI-detectors for the detection of γ-rays. The detector commissioning and performance characteristics are described with an emphasis on the neutron-detector components