Papers by Filippo Terrasi
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2015
Cited References Count:21|AMERICAN PHYSICAL SOC|ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 US... more Cited References Count:21|AMERICAN PHYSICAL SOC|ONE PHYSICS ELLIPSE, COLLEGE PK, MD 20740-3844 USA|Espinoza-Quinones, FR|Rizzutto, MA|Cybulska, EW|Seale, WA|Oliveira, JRB|Medina, NH|Ribas, RV|Rao, MN|Bazzacco, D|Brandolini, F|Lunardi, S|Petrache, CM|Podolyak, Z|Rossi-Alvarez, C|Soramel, F|Ur, CA|Cardona, MA|de Angelis, G|Napoli, DR|Spolaore, P|Gadea, A|De Acuna, D|De Poli, M|Farnea, E|Foltescu, D|Ionescu-Bujor, M|Iordachescu, A|Roca, V|Terrasi, F|Chatterjee, A|Saxena, A|Bohus, LS|ISI Document Delivery No.:257EB
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2013
Nuclear Physics A, 1993
Complex fragments have been detected in singles and in gamma-particle coincidence measurements fo... more Complex fragments have been detected in singles and in gamma-particle coincidence measurements for the 19F + 64Ni system, at 118 MeV incident energy. Cross sections for the excited states of the complex fragments were measured detecting the characteristic gamma-transitions deexciting these states. The measurement of cross sections for the population of the ground and excited states of 18O and 13C,
Radiocarbon, 2008
The pretreatment of samples for radiocarbon measurements, transforming a variety of materials int... more The pretreatment of samples for radiocarbon measurements, transforming a variety of materials into graphite solid targets, represents a critical point in the accelerator mass spectrometry (AMS) procedure. We describe the new, state-of-the-art CIRCE AMS preparation laboratory, particularly the setup and optimization of an alternative method, the zinc reduction method, for graphite target production, compared to the more common hydrogen reduction method. Measured 14C values on standard and blank samples reduced via zinc reaction revealed mean background levels, accuracy, and sensitivity comparable to those obtained by our conventional hydrogen reaction lines. Zinc line reduction at the CIRCE laboratory represents an effective and powerful alternative to the conventional hydrogen reduction, ensuring higher sample throughput with lower costs at a comparable performance level.
Radiocarbon, 2019
ABSTRACTTo determine the 237Np concentration originating from global fallout in the environment, ... more ABSTRACTTo determine the 237Np concentration originating from global fallout in the environment, samples were collected from Guangxi, south of China, and measured by accelerator mass spectrometry (AMS) at CIRCE. Serials standard samples and environment samples were prepared and measured using 242Pu as a tracer. The result indicates that the detection limit of 237Np as low as 10–15 g can be obtained. The concentration of 237Np in the environmental samples is less than 49.09 pg/kg (i.e. 1.280 mBq/kg), and the most probable value of 237Np is approximately 20 pg/kg (i.e. 0.53 mBq/kg).
Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 2019
A new multi-isotope plutonium standard for isotopic ratio measurements with Accelerator Mass Spec... more A new multi-isotope plutonium standard for isotopic ratio measurements with Accelerator Mass Spectrometry (AMS) was created by gravimetric mixing of different single-isotope standards provided by IRMM
PloS one, 2015
It is still unclear whether the exponential rise of atmospheric CO2 concentration has produced a ... more It is still unclear whether the exponential rise of atmospheric CO2 concentration has produced a fertilization effect on tropical forests, thus incrementing their growth rate, in the last two centuries. As many factors affect tree growth patterns, short -term studies might be influenced by the confounding effect of several interacting environmental variables on plant growth. Long-term analyses of tree growth can elucidate long-term trends of plant growth response to dominant drivers. The study of annual rings, applied to long tree-ring chronologies in tropical forest trees enables such analysis. Long-term tree-ring chronologies of three widespread African species were measured in Central Africa to analyze the growth of trees over the last two centuries. Growth trends were correlated to changes in global atmospheric CO2 concentration and local variations in the main climatic drivers, temperature and rainfall. Our results provided no evidence for a fertilization effect of CO2 on tree ...
Plant and Soil, 2010
Above ground litter decomposition is the result of three interlinked processes: leaching, fragmen... more Above ground litter decomposition is the result of three interlinked processes: leaching, fragmentation and catabolism. Litter decomposition estimates are most commonly based on measurements of mass loss from litter residues, confined in mesh bags. This method provides a rough estimate of leaching and catabolism, while preventing fragmentation from occurring. Alternatively, litter decomposition is studied in the laboratory as microbial respiration of litter residue. In this case, generally only catabolism is measured. While those limits are often discussed, their careful assessment has never been attempted. We present here results from a study where the decomposition rate of Arbutus unedo leaf litter, at a throughfall manipulation experiment, was investigated using: 1) litterbags; 2) turnover based on litter input/standing litter pool; 3) 14 C-bomb spike; 4) laboratory incubation; 5) DayCent modeling. Aims of this study were: 1) to quantitatively assess the hypothesis that the litterbags and the laboratory incubation methods, by preventing fragmentation, overestimate above ground litter mean residence time; 2) to evaluate the ability of the above methods to capture the effects of changes in precipitation on litter decay rates. Results confirmed our hypothesis and demonstrated that the litterbag and the laboratory incubation methods do capture the effects of the water manipulation treatment on litter decay rates.
Physical Review C, 1989
Measurements of γ-ray multiplicity in coincidence with the projectile-like fragments from inelast... more Measurements of γ-ray multiplicity in coincidence with the projectile-like fragments from inelastic collision of 32 S on 64 Ni at 160.5 MeV lab bombarding energy are reported. The experimental multiplicity increases with increasing total kinetic energy loss and shows a plateau above ...
Radiocarbon, 2012
The Ansanto Valley (southern Italy) is characterized by hydrothermal phenomena, with volcanic gas... more The Ansanto Valley (southern Italy) is characterized by hydrothermal phenomena, with volcanic gas emissions arising from some vents. In the 1 st millennium BC, a sanctuary dedicated to the goddess Mephitis was built but later destroyed by landslides in the valley. During archaeological excavations in the 1950s, many items were found including wooden artifacts, preserved thanks to the imbibition and subsequent mineralization of the wood tissues due to the gas emissions. Radiocarbon dating of these objects is underway at CIRCE (Centre for Isotopic Research on Cultural and Environmental Heritage), in Caserta, Italy. Unfortunately, 2 main problems arise in dating these materials. The first is possible fossil dilution caused by the CO2 emitted from the nearby volcanic vents, which could affect the trees of the valley and also the archaeological materials. In order to determine the magnitude of the fossil dilution in the area, 14C measurements were performed on contemporaneous wood cored ...
Physical Review Letters, 2006
Andean Geology, 2021
In this paper we illustrate the stratigraphy, geochronology, and geochemistry (major, minor, trac... more In this paper we illustrate the stratigraphy, geochronology, and geochemistry (major, minor, trace elements and Sr-isotopes) of a Holocene tephra layer found within coastal sedimentary deposits north of Caleta Olivia (Santa Cruz Province, Argentina). The stratigraphic succession comprises beach deposits with basal erosive surface resting on the local substrate (“Formación Patagonia”) followed by a poorly developed paleosoil. The paleosoil is covered by a lenticular fine-grained (Mdφ: 5.2, 0.027 mm), well sorted (σφ: 1.2) volcanic ash layer and aeolian sands. The geochemical composition of shard fragments points to an origin from the Hudson volcano, located in the southern Andes, ca. 400 km to the west. The geochemistry, Sr-isotopes and the radiometric constraints (younger than the age of the underlying marine layer dated at ca. 4,100 a cal BP) further allow correlating this tephra with the so-called H2 eruption (ca. 3,900 a cal BP). This finding is of interest owing to the poor pres...
Radiocarbon, 2021
ABSTRACTThe Iron Age chronology at Arslantepe is the result of the interpretation of Luwian hiero... more ABSTRACTThe Iron Age chronology at Arslantepe is the result of the interpretation of Luwian hieroglyphic inscriptions and archaeological data coming from the site and its surrounding region. A new round of investigations of the Iron Age levels has been conducted at the site over the last 10 years. Preliminary results allowed the combination of the archaeological sequence with the historical events that extended from the collapse of the Late Bronze Age empires to the formation and development of the new Iron Age kingdoms. The integration into this picture of a new set of radiocarbon (14C) dates is aimed at establishing a more solid local chronology. High precision 14C dating by accelerator mass spectrometry (AMS) and its correlation with archaeobotanical analysis and stratigraphic data are presented here with the purpose of improving our knowledge of the site’s history and to build a reliable absolute chronology of the Iron Age. The results show that the earliest level of the sequenc...
European Physical Journal A, 2020
Journal of Coastal Conservation, 2017
A multi-proxy approach has been adopted to reconstruct the Holocene history of the St. Eufemia Pl... more A multi-proxy approach has been adopted to reconstruct the Holocene history of the St. Eufemia Plain (western Calabria, Italy) and to discern the influence that sea level rise and tectonics exerted in its evolution. Sedimentological, paleoecological and palynological data have been obtained from a 24-m long core, mostly made of pelitic back-barrier sediments, chronologically constrained by twelve AMS 14 C dates. Radiocarbon ages of lagoon samples have been corrected by taking into account the influence of both the marine and hardwater effect on the reservoir age. The new data have been integrated with those of pre-existing stratigraphies in order to better characterize the overall sedimentary architecture of the plain. In the early Holocene (from ca. 8300 to ca. 6900 yr. cal BP), eustasy largely prevailed on the tectonic uplift, causing coastline ingression and aggradation. From ca. 6900 to ca. 2800 yr. cal BP, coastline progradation and aggradation were driven by high detrital inputs and slowdown of sea level rise, during a phase characterized by a general weak subsidence. From ca. 2800 to ca. 1400 yr. cal BP, higher rates of subsidence favored the establishment of marsh and flooded alluvial plain environments in the back-barrier domain. After ca. 1400 yr. cal BP, a substantial stability characterized the St. Eufemia Plain.
Applied Sciences
We report a high sensitivity study of actinides content in water and sediment matrices performed ... more We report a high sensitivity study of actinides content in water and sediment matrices performed for the first time along the Garigliano river, near the nuclear power plant currently undergoing decommissioning, and in the marine environment surrounding the river mouth up to a depth of 100 m. Ultrasensitive accelerator mass spectrometry measurements were carried out to estimate the absolute values of 236U, 238U, 239Pu, and 240Pu concentrations and 236U/238U, and 239Pu/240Pu ratios. The accuracy of the measurements and the spatial distribution of the radionuclides enable us to discriminate the anthropogenic from the natural radionuclide’s contribution to the environmental radioactivity. The results indicate that the contribution to the anthropogenic contamination of past power plant operations is, in most of the examined environmental compartments, negligible compared to fallout. High resolution γ-ray spectrometry measurements for 137Cs and 40K show interesting correlations with the a...
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Papers by Filippo Terrasi