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Tiberiu Bogdan Sava

Tiberiu Bogdan Sava
Ionplus AG & IFIN-HH

Senior Researcher

About

143
Publications
26,689
Reads
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825
Citations
Citations since 2017
78 Research Items
474 Citations
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
2017201820192020202120222023020406080100
Introduction
I am a physicist with scientific interests in the fields of particle accelerators, experimental nuclear physics and applications of the nuclear methods in environmental studies and archaeometry. My latest expertise is Accelerator Mass Spectrometry with its core application, the radiocarbon dating. I am the founder of the RoAMS Laboratory and coordinator of a young group of scientists. My latest studies are directed towards Romanian paleo-sciences but also includes locations from US and Europe.
Additional affiliations
February 2017 - present
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering
Position
  • Head of Department
Description
  • Department management, project management, AMS research, technological development
December 2014 - December 2017
Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering
Position
  • Laboratory Manager

Publications

Publications (143)
Article
A B S T R A C T We report here on the 2019 discovery of an Upper Palaeolithic female figurine at the open-air site of Piatra Neamt; in the Bistrit;a valley, Romania. This figurine, the first ever to be discovered in Romania, was found in an area in which Palaeolithic figurative art is extremely poorly represented and such figurines are absent. We s...
Article
Noviodunum was the headquarters of the Roman Imperial fleet Classis Flavia Moesica from the 1st c. AD. Its importance as a river port is shown by its description in various ancient sources and itineraria. The settlement is located on a limestone promontory on the right bank of the River Danube (Romania). Its location is highly strategic, as it is t...
Preprint
Full-text available
Archaeological textiles are suitable material for radiocarbon dating since they are mainly made of organic matter, like plant and/or animal fibres. Radiocarbon dating provides objective age estimates of archaeological finds, based on measurements of the carbon-14 isotope present in the organic matter against an internationally used reference standa...
Article
Full-text available
Anoxic marine sediments at the confluence with large rivers are key archives for monitoring the anthropogenic impact in the environment and asses the carbon sink character of oxygen deprived waters. This data article describes the analysis methodology and the results of the deep-sea sediments sampled from the NW part of the Black Sea, using the ¹⁴C...
Article
The odd-mass Pd99–105 nuclei were studied via Zr90–96(C12,13,xnγ) fusion/evaporation reactions. The beam was provided by the IFIN-HH Tandem accelerator at energies of approximately 50 MeV. Emitted γ rays were detected by the hybrid multidetector system RoSphere. The structure of the low-lying excited states in Pd99–105 and their gamma-decay pattern...
Article
We constructed a high-resolution Bayesian sedimentation model spanning the last 5500 years based on 25 AMS radiocarbon dated sediments of bulk organic matter (OM) sampled from the NW Black Sea anoxic waters of the continental slope. The corrections for the ¹⁴C ages due to marine reservoir effect (MRE) and detritus organic carbon are correlated with...
Article
The Vârghiș Gorges karst system (Perșani Mountains, Eastern Carpathians) constituted a point of interest for speleologists, paleontologists and archaeologists since the second half of the 19th century. Their efforts succeeded in highlighting the notable archaeological potential of the area, although the actual research results were not always thoro...
Article
Half-lives of the low-lying yrast states of ²¹²Po have been measured using the delayed coincidence fast-timing method. We report on the first measurement of the 41+ half-life, as well as a new measurement of the 61+ half-life with improved accuracy compared to previous studies. The extracted lifetime of the 41+ and 61+ state have been determined to...
Article
Full-text available
The structure of Ge80 has been investigated at the ISOLDE facility at CERN. A previous study reported for the first time a low-lying 02+ intruder state at 639 keV, based on the coincidence with a previously unobserved 1764-keV γ ray, and suggested it as evidence for shape coexistence in Ge80. We used the β decay from the 3− 22.4-keV state in Ga80 t...
Preprint
Full-text available
Peatlands are one of the largest terrestrial carbon sinks on the planet, yet little is known about carbon accumulation rates (CARs) of mountainous examples. The long-term variability in the size of the associated carbon sink and its drivers remain largely unconstrained, especially when long-term anthropogenic impact is also considered. Here we pres...
Article
Full-text available
This paper documents the Late-Holocene environmental changes and human presence in the northern Danube delta using a multidisciplinary approach that combines geoscientific data with archaeological findings, historical texts, and maps. It follows the formation and progression of the Chilia distributary and the reconfiguration of socioeconomic activi...
Article
Full-text available
Peatlands are one of the largest terrestrial carbon sinks on the planet, yet little is known about the carbon accumulation rates (CARs) of mountainous peatlands. The long-term variability in the size of the associated carbon sink and its drivers remain largely unconstrained, especially when the long-term anthropogenic impact is also considered. Her...
Article
Full-text available
Istros, founded during the 7th century BCE, is one of the oldest Greek colonies on the shores of the Black Sea. On the southern margin of the Danube delta, what was an ancient maritime city is now a landlocked archaeological site. Even though archaeological investigations have continued since 1914, the location of the harbour(s) remains unknown. Ef...
Conference Paper
Istros, founded during the 7th century BCE, is one of the oldest Greek colonies on the shores of the Black Sea. On the southern margin of the Danube delta, what was an ancient maritime city is now a landlocked archaeological site. Even though archaeological investigations have continued since 1914, the location of the harbour(s) remains unknown. Ef...
Article
Lifetimes of the low-energy levels in Nd136, populated in the reaction Te124(O16,4n), were measured with the ROSPHERE array at the Horia Hulubei National Institute for Physics and Nuclear Engineering (IFIN-HH), Bucharest-Magurele. The data were analyzed using the recoil distance Doppler shift method, and, in the cases where lifetimes were τ⩽1 ps, D...
Article
Full-text available
Forest steppes are dynamic ecosystems, highly susceptible to changes in climate, disturbances and land use. Here we examine the Holocene history of the European forest steppe ecotone in the lower Danube Plain to better understand its sensitivity to climate fluctuations, fire and human impact, and the timing of its transition into a cultural forest...
Article
Full-text available
Feature 96 (Cx 96) from Site 9 at Sânpaul–Usturiș is a unique discovery in the Gáva culture. This feature is a pit in which were found: a partial human skeleton, one unattached human long bone, the complete skeleton of a hare, a part of a channeled amphora and various other potsherds, a small fragment of a hearth-surface, and a fragment of a sandst...
Chapter
Full-text available
Peștera Izbucu Topliţei de Vida (sat Luncasprie, comuna Dobrești, județul Bihor), care adăpostește un sit preistoric puțin explorat, este amplasată de altitudinea de 250 m deasupra nivelului mării, în partea de nord a lacului de acumulare de la Luncasprie. Situl a fost descoperit în anul 1982 și studiat în condiții dificile de către speologi și cer...
Article
Full-text available
The elastic scattering process for the nuclear reactions induced by the Radioactive Ion Beams ⁷ Be and ⁸ B on a ²⁰⁸ Pb target was measured for the first time in the energy range around the Coulomb barrier. Extensive theoretical calculations within the framework of the optical model were performed. An excellent agreement between experimental data an...
Article
Full-text available
The systematic research started in 2010 at Tărtăria continue to this day. To clarify the problem of the absolute chronology of the site we have researched on a checkered row (Carriage 25-32) from the SI surface (2019) and carried out sampling for this operation. On this occasion we obtained the evidence published in this article.
Article
Full-text available
The tell settlement from “Măgura Gumelnița” is the eponymous site of the Eneolithic civilization with the same name. It is probably the most significant tell settlement north of the Danube, and it belonged to the Kodjadermen ‐ Gumelnița ‐ Karanovo VI cultural complex that occupied the Balkan area in the second half of 5th millennium BC. During 2018...
Article
Full-text available
Water availability for Native Americans in the southwestern United States during periods of prolonged droughts is poorly understood as regional hydroclimate records are scant or contradicting. Here, we show that radiocarbon-dated charcoal recovered from an ice deposit accumulated in Cave 29, western New Mexico, provide unambiguous evidence for five...
Preprint
Full-text available
Forest steppes are dynamic ecosystems, highly susceptible to changes in climate and land use. Here we examine the Holocene history of the European forest steppe ecotone in the Lower Danube Plain to better understand its sensitivity to climate fluctuations and human impact, and the timing of its transition into a cultural forest steppe. We used mult...
Article
The β− decay of Zn81 to the neutron magic N=50 nucleus Ga81, with only three valence protons with respect to Ni78, was investigated. The study was performed at the ISOLDE facility at CERN by means of γ spectroscopy. The Zn81 half-life was determined to be T1/2=290(4) ms while the β-delayed neutron emission probability was measured as Pn=23(4)%. The...
Article
The Eastern Romanian Carpathians harbor a rich Upper Paleolithic archaeological record, mostly concentrated on the Bistrița river terraces. Despite extensive field research spanning decades, the regional archaeological record has long suffered from poor chronometric support and contradictory taxonomy. The recently excavated spot at Bistricioara-Lut...
Preprint
Full-text available
The $\beta^{-}$ decay of $^{81}$Zn to the neutron magic $N=50$ nucleus $^{81}$Ga, with only three valence protons with respect to $^{78}$Ni, was investigated. The study was performed at the ISOLDE facility at CERN by means of $\gamma$ spectroscopy. The $^{81}$Zn half-life was determined to be $T_{1/2}=290(4)$ ms while the $\beta$-delayed neutron em...
Article
The unraveling of the geological processes, which are recorded in the chemical and isotopic fingerprinting of the deep-sea sediments, demands the introduction of a sensitive parameter over time. The aim of this study is to analyze the deep-sea sediments from the Black Sea, using the stable isotopic and elemental content. For this purpose, 41 sedime...
Article
The Carpathian island-type glaciokarst has a great potential of preserving signals of past environments, archived in cave deposits like speleothems and clastic infills. We present here the geomorphology and structural control of several relict alpine caves and the surrounding glaciated marble karst in the Făgăraș Mountains. Four truncated and parti...
Article
Full-text available
The aim of this paper is to present a series of discoveries attributed to the Turkic nomadic populations (11th– 12th centuries), resulting from archaeological research conducted in 2018 and 2019 in several burial mounds placed in the localities of Târgșoru Nou and Inotești from Prahova County, as well as Lunca from Buzău county. It includes descrip...
Article
Full-text available
Zusammenfassung: Die begleitenden archäologischen Rettungsmasnahmen entlang der Autobahn Nr. 2 führten im Abschnitt Cernavodă-Medgidia, beim km. 152, zur Entdeckung eines Grubenfeldes, das allerdings nicht vollständig ausgegraben werden konnte. Die Fundstelle liegt südlich der Stadt Cernavodă bei „Dealurile [Hügel] Cochirlenilor“, auf einer hohen D...
Article
Full-text available
Human skeletal remains of at least three individuals were unearthed during excavations at the Early Neolithic site of Grumăzeşti-Deleni in northeast Romania (Moldova region) between 1968 and 1978. They comprise the articulated skeleton of an adult buried in a crouched position (M1), and the disarticulated remains of another adult and a juvenile fou...
Article
Full-text available
The preventive archaeological researches of 2011 led to sensational discoveries. These include evidence for the extraction of radiocarbon data. We analyze new evidence from the periods: neolithic and eneolithic (Turdaş culture), eneolithic (Petreşti culture) and classical dacian period (1st century AD).
Article
Full-text available
Two horses were uncovered at Negrileşti, laid in a pit (feature 22) within the Noua settlement, towards its eastern limit. The archaeological investigations uncovered the burial of two horses, whose skeletons were relatively complete. The animals were placed facing one another, lying on their left side (Horse 1), respectively on their right side (H...
Article
Full-text available
The modern antiquities market uses radiocarbon ( ¹⁴ C) dating to screen for forged objects. Although this fact shows the potential and power of the method, the circumstances where it is applied can be questionable and call for our attention. Here we present an outline of a call to radiocarbon laboratories for due diligence and best practice approac...
Article
At ELI-NP, isotopes of refractory elements and heavy rare earth elements will be investigated by using the ion guide isotope separation on-line technique (IGISOL). A two-chamber cryogenic stopping cell with orthogonal extraction will be used together with RF carpets for the production and extraction of radioactive ions. In the present work, the ext...
Article
Full-text available
The Holocene fluvial history of rivers draining the Romanian Carpathians has been assessed using a database resulting from the authors’ own field research at more than 50 sites comprising natural exposures (riverbanks), anthropogenic exposures (gravel pits) and manual boreholes carried out in floodplains, as well as on the analysis of over 30 publi...
Article
The aim is to introduce and characterize a new experimental demonstrative model contributing to the increase of measurement accuracy, in terms of Minimum Detectable Activity (MDA) and Background reduction, for the analysis of samples having low concentrations in tritium and radiocarbon on Quantulus 1220™. The clue is related to the qualitative and...
Article
Full-text available
The elastic scattering of the weakly bound radioactive nuclei B8 and Be7 from a Pb208 target was measured for the first time in the energy range around the Coulomb barrier. The data were analyzed using the optical model and the continuum discretized coupled channels (CDCC) formalisms. The reaction cross sections extracted from the optical model fit...
Article
Full-text available
The modern antiquities market uses radiocarbon (14 C) dating to screen for forged objects. Although this fact shows the potential and power of the method, the circumstances where it is applied can be questionable and call for our attention. Here we present an outline of a call to radiocarbon laboratories for due diligence and best practice approach...
Article
Full-text available
We present a comparative study on a 700-year sequence of dendrochronology ordered tree-rings of Pinus cembra originating from Eastern Carpathians for the period AD 1009 to1709. This period covers the solar minima of the Little Ice Age. The aim of this study is to assess the accuracy of our 14C determinations interpreted on the IntCal13 calibration...
Presentation
A rich photo-fission program is proposed at the new Extreme Light Infrastructure - Nuclear Physics (ELI-NP) facility in Magurele-Bucharest, Romania. It is based on the highest brilliance gamma beam system (GBS) that will be available at ELI-NP with energies up to 20 MeV. In one type of experiments, radioactive ion beams (RIBs), formed from the fiss...
Chapter
Full-text available
Free access to the whole book on: www.archaeopress.com/ArchaeopressShop/Public/defaultAll.asp?intro=Home&PublishedDateGT=16+Apr+2018. This paper discusses the absolute dating of the Wietenberg culture based on five new radiocarbon dates and the assessment of the 34 previously published dates. In contradistinction to earlier research that situated t...
Chapter
Full-text available
Free access on: www.archaeopress.com/ArchaeopressShop/Public/defaultAll.asp?intro=Home&PublishedDateGT=16+Apr+2018. The article discusses the results of the radiocarbon dating and a few analyses of carbon and nitrogen stable isotopes for diet reconstruction and elemental composition of metal from the late medieval cemetery (14th/15th to mid-17th ce...
Chapter
Full-text available
Free access to the whole book on: www.archaeopress.com/ArchaeopressShop/Public/defaultAll.asp?intro=Home&PublishedDateGT=16+Apr+2018. This article presents the results of radiocarbon dating and wood anatomy analyses of the wooden church built in Borovinești (Argeș County, Southern Romania) in 1869. The aim was to verify whether the church was made...
Conference Paper
Hydraulic lime mortars have been an important segment of human society for thousands of years. Recipes of production, construction behavior over time and physico-chemical investigations for material characterization and reconstitution of recipe for buildings restoration are continuing challenges. Neither radiocarbon method is an exception; the dati...
Conference Paper
There is a broad area of applications that can result by “exploiting” small tandem accelerators. The 3 MV TandetronTM from IFIN-HH has been operational for 6 years now and more than 4000 h of beam time per year has been provided so far. The applications performed at this machine comprise a broad area of interdisciplinary activities with direct appl...
Conference Paper
Full-text available
Radiocarbon dating of archaeological bones may sometimes provide erroneous data when they contain contaminants having exogenous carbon. To solve this problem, in RoAMS Laboratory from IFIN-HH, dating individual amino acids was achieved. First results obtained for amino acid standards show that the standards ages were in concordance with those obtai...
Conference Paper
Full-text available
We present a short laboratory portrait which includes the main directions of research regarding the radiocarbon dating, together with our dedicated instrumentation and infrastructure. Different results obtained in different research fields like archaeology, environmental studies and cultural heritage are presented, as well as comments on sample pre...
Article
An IGISOL beamline that produces neutron-rich nuclei via photo- fission induced by a high-brilliance gamma beam is being developed at the Extreme Light Infrastructure - Nuclear Physics (ELI-NP) facility. The core device will be a cryogenic stopping cell with an actinide target system in its center. We report on some of the latest simulation results...
Article
Preventive archaeological research from 2011 led to sensational discoveries. Between these, samples were collected for the extraction of radiocarbon data. We analyze them in these lines. !ey belong to the epochs: early Neolithic and Eneolithic (Turdaş culture), developed Eneolithic (Petreşti culture) and the classical dacian period (1 st century BC...
Article
Full-text available
This study proposes a local paleo-landscape reconstruction of the Danube floodplain based on a stratigraphic sequence retrieved from Brateș Lake which, by its emplacement near the confluence of Danube-Prut rivers, was fully receptive to changes associated to hydrological, geomorphological or anthropogenic driven events. Due to its intermediate posi...
Article
Full-text available
The present study presents the investigations of some osteological assemblages from the deposits of the Museum of Dacian and Roman Civilisation, Deva, and the National Museum of Transylvanian History. Chronologically, the materials belong to contexts from the final stage of the Early Iron Age (EIA) and, possibly, to the period of the early La Tène...
Article
Full-text available
The accelerator mass spectrometry (AMS) center at Horia Hulubei National Institute for R&D in Physics and Nuclear Engineering, Bucharest, is based on the latest-generation 1 MV Tandetron ® accelerator, produced by High Voltage Engineering Europa (HVEE), The Netherlands. The AMS center became fully functional at the start of 2013, and at the end of...
Article
Full-text available
Archaeological data provide evidence of human inhabitation in the Danube Delta since the Early Neolithic with once flourishing human settlements such is the case of Enisala and Babadag settlements. Their remains dating back from Eneolithic (Enisala) or Iron Age (Babadag) or from their revivals in Antiquity and Medieval Age have been found on higher...
Article
Full-text available
In this contribution we describe the first results obtained for the investigation of the elastic scattering process in the reactions induced by the Radioactive Ion Beams ⁷Be and ⁸B on a ²⁰⁸Pb target at Coulomb barrier energies. The experimental data were analyzed within the framework of the optical model in order to extract the total reaction cross...
Article
The Paleolithic settlement of Poiana Cireșului is located in north-eastern Romania (the city of Piatra Neamț), on the right side of the Bistrița valley, near the confluence with the Doamna river. Recent investigations have revealed four archaeological layers: one Epigravettian layer and three Gravettian ones. The first Gravettian layer, which is co...