7 research outputs found
LUNA: The 15N(p,γ)16O reaction study at low energies with a BGO detector
No full textThe 15N(p,γ )16O reaction has been intensively studied by the LUNA collaboration. In this contribution the measurements performed using a 4π -BGO detector and a solid target setup are described. The data, which are being analyzed, cover for the first time the entire Gamow peak for nova scenarios and investigate the Gamow energies for AGB and RGB stars. A detailed report of the target analysis and the procedure to determine the S-factor is described while the final results are still under evaluation. © Copyright owned by the author(s)
Scintillator developments for high energy physics and medical imaging
No full textScintillating crystals have been for a long time developed as a basic component in particle detectors with a strong spin-off in the field of medical imaging. A typical example is BGO, which has become the main component of PET scanners since the large effort made by the L3 experiment at CERN to develop low cost production methods for this crystal. Systematic R&D on basic mechanism in inorganic scintillators, initiated by the Crystal Clear Collaboration at CERN 10 years ago, has contributed not to a small amount, to the development of new materials for high energy physics and for a new generation of medical imaging devices with increased resolution and sensitivity. The examples of the lead tungstate crystal for the CMS experiment at CERN (high energy physics) as well as of new materials under development for medical imaging will be described with an emphasis on the mutual benefit both fields can extract from a common R&D effort. (14 refs)
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High Energy Physics
No full textThe Counter Group continues to work on data analysis for Fermilab Experiment E653. Altogether, they expect several thousand reconstructed charm events and approximately 25 B pair events of which 12 have been observed thus far. Preparation continue for Fermilab Experiment E781, a high statistics study of charm baryon production. In the Theory Group, Cutkosky and collaborators study hadron phenomenology and non-perturbative QCD calculations. Levine has a long standing program in computational QED to obtain improved theoretical values for g-2 of the electron. Wolfenstein, Li, and their collaborators have worked on areas of weak interaction phenomenology that may yield insights beyond the standard model, e.g. CP violation and non-zero neutrino masses. Holman has been concerned with phase transitions in gauge theories relevant to cosmological problems. During 1991 most of the group effort was concentrated on the L3 experiment at CERN. Highlights of the results from the analysis of the Z{degrees} resonance include (a) a measurement of the strong coupling constant {alpha}{sub s} for b quarks (b) a precision measurement of the average time of B hadrons and (c) a direct determination of the number of light neutrino faculties from the reaction e{sup +}e{sup {minus}} {yields} {nu}{bar {nu}}{gamma}. We also began a major upgrade of the L3 luminosity monitor by replacing PWC chamber by a Si strip system in front of the BGO calorimeters. Finally we have continued our SSC R&D work on BaF{sub 2} by joining the GEM collaboration
Recommended from our members
High Energy Physics
No full textThe Counter Group continues to work on data analysis for Fermilab Experiment E653. Altogether, they expect several thousand reconstructed charm events and approximately 25 B pair events of which 12 have been observed thus far. Preparation continue for Fermilab Experiment E781, a high statistics study of charm baryon production. In the Theory Group, Cutkosky and collaborators study hadron phenomenology and non-perturbative QCD calculations. Levine has a long standing program in computational QED to obtain improved theoretical values for g-2 of the electron. Wolfenstein, Li, and their collaborators have worked on areas of weak interaction phenomenology that may yield insights beyond the standard model, e.g. CP violation and non-zero neutrino masses. Holman has been concerned with phase transitions in gauge theories relevant to cosmological problems. During 1991 most of the group effort was concentrated on the L3 experiment at CERN. Highlights of the results from the analysis of the Z[degrees] resonance include (a) a measurement of the strong coupling constant [alpha][sub s] for b quarks (b) a precision measurement of the average time of B hadrons and (c) a direct determination of the number of light neutrino faculties from the reaction e[sup +]e[sup [minus]] [yields] [nu][bar [nu]][gamma]. We also began a major upgrade of the L3 luminosity monitor by replacing PWC chamber by a Si strip system in front of the BGO calorimeters. Finally we have continued our SSC R D work on BaF[sub 2] by joining the GEM collaboration
The Influence of Literature in 1960s British Popular Music: Approaches to Popular Composition
No full textThere is a noticeable influence of literature and literary techniques in the popular music songs of the countercultural period in Britain (1965-71). These dates, as noted by Jonathon Green, characterize the beginning of the UK countercultural movement of the 1960s, culminating with the 1971 trial of the OZ magazine, which Green regards as marking the end of the period (1999).
There are three main questions that this project explores. In what ways did songwriters of the era use literature as an inspiration in the compositional process? How can literary influenced songwriting techniques be used and extended in contemporary popular composition? How useful are these techniques and the extensions of these techniques in the compositional process?
This project investigates the influence of literature on the songwriters of the era by analysing relevant song examples and subsequently inventing systematic forms that songwriters today can use as a basis for composition. A portfolio of original compositions is included, which demonstrates various approaches to composition that abide by the systematic forms, which stem from the literary influence of the 1960s songwriters. This project makes a contribution to our knowledge and understanding of popular music, as the influence of literature, especially the application of literary techniques in the compositional process, is a subject that has not been researched previously in any great depth. The abundance of available literary techniques and the possibilities for the invention of techniques is an exciting prospect when applied to popular composition.
After highlighting certain issues such as the homogeneity of songwriters and poets, a brief contextual background is given concerning 1960s counterculture and popular music. A taxonomy of systematic forms is created, into which are placed literary influenced techniques used by songwriters such as Syd Barrett and John Lennon, illustrated by a number of examples. Explanations of the original compositions included in the portfolio highlight the attributes of various songwriting approaches and conclusions are drawn that look into the differing levels of constraint and artistic intuition and how these factors affect the compositional process
X-ray and gamma-ray timing of GRB 180720B, GRB 181222B, GRB 211211A, and GRB 220910A observed with Fermi and ASIM
No full textWe present a timing study of the gamma and X-ray observations and analysis of a sample of bright gamma-ray bursts (GRBs;
i.e. GRB 180720B, GRB 181222B, GRB 211211A, and GRB 220910A), including the very bright and long GRB 211211A
(a.k.a. kilonova candidate). They have been detected and observed by the Atmosphere–Space Interactions Monitor (ASIM)
installed on the International Space Station (ISS) and the Gamma-ray Burst Monitor (GBM) onboard the Fermi mission. The
early (T − T0≈ s) and high-energy (0.3–20 MeV) ASIM High Energy Detector (HED) and (150 keV–30 MeV) Fermi (BGO)
light curves show well-defined peaks with a low quasi-periodic oscillation (QPO) frequency between 2.5 and 3.5 Hz that could
be identified with the spin of the neutron star (NS) in the binary mergers originating these GRBs. These QPOs consist on the first
detection of low-frequency QPOs (≤10 Hz) detected in magnetars so far. We also detect a strong QPO at 21.8 − 22 Hz in GRB
181222B together with its (less significant) harmonics. The low-frequency QPO would correspond to the signal of the orbiting
NS previous to the final coalescence giving rise to the gravitational wave (GW) signal. © 2025 The Author(s).MCG acknowledges S. Xiao, M. Marisaldi, and A. Mezentsev for useful discussions and feedback. MCG acknowledges financial support from the Spanish Ministry project MCI/AEI/PID2023-149817OB-C31. RSR, YDH, MCG, SG, IPG, EJFG, RGB, MPV, and AJCT acknowledge financial support from the Spanish Ministry project PID2023-151905OB-I00 and the Severo Ochoa grant CEX2021-001131-S funded by MICIU/AEI/10.13039/501100011033. RG and SBP acknowledge BRICS grant DST/IMRCD/BRICS/PilotCall1 /ProFCheap/2017(G) for the financial support. RG and SBP also acknowledge the financial support of ISRO under AstroSat archival Data utilization programme (DS
2B-13013(2)/1/2021-Sec.2). RG was sponsored by the National Aeronautics and Space Administration (NASA) through a contract with ORAU. AJCT acknowledges support from the Junta de Andalucia Project P20
01068. MM, AL, AM, and NØ acknowledge financial support from the Research Council of Norway under Contracts 208028/F50 and 223252/F50 (CoE). This research has used data obtained through the HEASARC Online Service, provided by the NASA-GSFC, in support of NASA High Energy Astrophysics Programs. The NASA’s FGST (Fermi) mission is an astrophysics and particle physics partnership, developed in collaboration with the U.S. Department of Energy, along with important contributions from academic institutions and partners in France, Germany, Italy, Japan, Sweden, and the United States. ASIM is a mission of ESA’s SciSpace programme for scientific utilization of the ISS and non-ISS space exploration platforms and space environment analogues. ASIM and the ASIM Science Data Centre are funded by ESA and by national grants of Denmark, Norway, and Spain.With funding from the Spanish government through the "Severo Ochoa Centre of Excellence" accreditation (CEX2021-001131-S).Peer reviewe
