C. Costache
A5072635832- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Quantum Chromodynamics and Particle Interactions
- Advanced Chemical Physics Studies
- Nuclear reactor physics and engineering
- Advanced NMR Techniques and Applications
- Radiation Detection and Scintillator Technologies
- Atomic and Subatomic Physics Research
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Nuclear Materials and Properties
- Radioactive contamination and transfer
- Superconducting Materials and Applications
- Rare-earth and actinide compounds
- Gamma-ray bursts and supernovae
- Radioactive Decay and Measurement Techniques
- High-Energy Particle Collisions Research
- Radiation Therapy and Dosimetry
- Medical Imaging Techniques and Applications
- Scientific Research and Discoveries
- Neutrino Physics Research
- Quantum, superfluid, helium dynamics
- Magnetic properties of thin films
Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering
2016-2025
Czech Academy of Sciences, Institute of Physics
2024
University of Warsaw
2024
National Centre for Nuclear Research
2024
Universitatea Națională de Știință și Tehnologie Politehnica București
2017
An enhanced electric octupole (E3) strength of 45(5) W.u. has been measured for the <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:msup><a:mrow><a:mn>3</a:mn></a:mrow><a:mrow><a:mo>−</a:mo></a:mrow></a:msup><a:mo stretchy="false">→</a:mo><a:msup><a:mrow><a:mn>0</a:mn></a:mrow><a:mrow><a:mo>+</a:mo></a:mrow></a:msup></a:mrow></a:math> transition in <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"...
Mean lifetime measurements of low-lying yrast positive- and negative-parity states <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mmultiscripts><a:mi>Gd</a:mi><a:mprescripts/><a:none/><a:mn>150</a:mn></a:mmultiscripts></a:math> have been performed with the ROSPHERE array using <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mrow><b:mmultiscripts><b:mi>Ce</b:mi><b:mprescripts/><b:none/><b:mn>140</b:mn></b:mmultiscripts><b:mo>(</b:mo><b:mmultiscripts><b:mi...
A search for shape isomers in the ^{66}Ni nucleus was performed, following old suggestions of various mean-field models and recent ones, based on state-of-the-art Monte Carlo shell model (MCSM), all considering as lightest nuclear system with isomerism. By employing two-neutron transfer reaction induced by an ^{18}O beam a ^{64}Ni target, at sub-Coulomb barrier energy 39 MeV, three lowest-excited 0^{+} states were populated their γ decay observed γ-coincidence technique. The lifetimes...
The N=48 Ge80 nucleus is studied by means of β-delayed electron-conversion spectroscopy at ALTO. radioactive Ga80 beam produced through the isotope separation on line photofission technique and collected a movable tape for measurement γ e− emission following β decay. An electric monopole E0 transition, which points to 639(1) keV intruder 02+ state, observed first time. This new state lower than 21+ level in Ge80, provides evidence shape coexistence close one most neutron-rich doubly magic...
We have extracted the nuclear level density of ${}^{128}$Te from a $(\mathrm{p},\mathrm{p} '\gamma)$ scattering experiment using large-volume \labr\ and \cebr\ detectors ELI-NP at 9~MV Tandem facilities IFIN-HH. The decay data were normalised photonuclear data, resulting in densities without intrinsic model dependencies constant temperature or Fermi gas models. measured follows closely between expectations these two models, but we observe clear divergence microscopic based on Skyrme force.
Polonium isotopes having two protons above the shell closure at Z=82 show a wide variety of low-lying, high-spin isomeric states across whole chain. The structure neutron-deficient up to ^{210}Po (N=126) is well established as they are easily produced through various methods. However, there not much information available for neutron-rich counterparts which only selective techniques can be used their production. We report on first fast-timing measurements yrast 8^{+} level in ^{214,216,218}Po...
The low-spin structure of the semimagic ^{64}Ni nucleus has been considerably expanded: combining four experiments, several 0^{+} and 2^{+} excited states were identified below 4.5 MeV, their properties established. Monte Carlo shell model accounts for results unveils an unexpectedly complex landscape coexisting shapes: a prolate excitation is located at surprisingly high energy (3463 keV), with collective state 286 keV above it, first such observation in Ni isotopes. evolution minimum...
The decay properties of 133In were studied in detail at the ISOLDE Decay Station. implementation Resonance Ionization Laser Ion Source allowed separate measurements its 9/2+ ground state (133gIn) and 1/2− isomer (133mIn). With use β-delayed neutron γ spectroscopy, strengths above separation energy quantified this neutron-rich nucleus for first time. Gamow-Teller transition 9/2+→7/2+ was located 5.93 MeV 133gIn with a logft=4.7(1). In addition, several neutron-unbound states populated lower...
Background: The high complexity of the deuteron-nucleus interaction from deuteron weak binding energy 2.224 MeV is also related to a variety reactions induced by deuteron-breakup (BU) nucleons. Thus, specific noncompound processes as BU and direct (DR) make deuteron-induced so different with other incident particles. scarce consideration only pre-equilibrium emission (PE) compound-nucleus (CN) mechanisms led significant discrepancies experimental results that recommended reaction cross...
A detailed <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mi>β</a:mi></a:math>-decay study of the low- and high-spin states in <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:mmultiscripts><b:mi>Bi</b:mi><b:mprescripts/><b:none/><b:mn>216</b:mn></b:mmultiscripts></b:math> has been performed at ISOLDE Decay Station CERN-ISOLDE facility. In total, 48 new levels 83 transitions <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mi>β</c:mi></c:math>-decay daughter <d:math...
Excited states in B10 were populated with the B10(p,p′γ)B10* reaction at 8.5 MeV and their γ decay was investigated via coincidence γ-ray spectroscopy. The emitted rays measured using large-volume LaBr3:Ce CeBr3 detectors placed anti-Compton shields. This allowed observation of weak transitions, such as M3 transition between Jπ,T=0+,1 isobaric analog state (IAS) Jπ,T=3+,0 ground E2 Jπ,T=21+,0 IAS, i.e., performing measurements branching ratios level λ≥10−4. For first time B10, competing M1...
The occurrence of octupolar shapes in the Ba isotopic chain was recently established experimentally up to $N=90$. To further extend systematics, evolution most neutron-rich members $Z=56$ accessible at present, $^{148,150}\mathrm{Ba}$, has been studied via $\ensuremath{\beta}$ decay ISOLDE Decay Station. This paper reports on first measurement positive- and negative-parity low-spin excited states $^{150}\mathrm{Ba}$ presents an extension $\ensuremath{\beta}$-decay scheme $^{148}\mathrm{Cs}$....
The β− decay of 34Mg was used to study the 34Al nucleus through γ spectroscopy at Isotope Separator On-Line facility CERN. Previous studies identified two β-decaying states in having spin-parity assignments Jπ=4− dominated by normal configuration π(d5/2)−1⊗ν(f7/2) and Jπ=1+ intruder π(d5/2)−1⊗ν(d3/2)−1(f7/2)2. Their unknown ordering relative energy have been subject debate for placement inside or outside N=20 "island inversion." We report here that 1+ lies only 46.6 keV above 4− ground...
The N=52 Ga83 β decay was studied at ALTO. radioactive 83Ga beam produced through the ISOL photofission technique and collected on a movable tape for measurement of γ-ray emission following decay. While β-delayed neutron has been measured to be 56–85% path, in this experiment an unexpected high-energy 5–9 MeV yield 16(4)% observed, coming from states several MeVs above separation threshold. This result is compared with cutting-edge QRPA calculations, which show that when neutrons deeply...
Abstract Following the EUROfusion PPPT-programme action for an advanced modeling approach of deuteron-induced reaction cross sections, as well specific data evaluations in addition TENDL files, assessment details and corresponding outcome latter option TALYS breakup model has been carried out. The enhancement obtained meantime within computer code TALYS, by using evaluated nucleon-induced TENDL-2019, is particularly concerned. Discussion results, reactions on $$^{58}$$ <mml:math...
Neutron-rich Ba isotopes are expected to exhibit octupolar correlations, reaching their maximum in around mass A = 146. The odd-A neutron-rich members of this isotopic chain show typical patterns related non-axially symmetric shapes, which however less marked compared even-A ones, pointing a major contribution from vibrations. In the present paper we results recent study focused on 148–150Cs β-decay performed at ISOLDE Decay Station equipped with fast-timing detectors. detailed analysis...
The β decays from both the ground state and a long-lived isomer of ^{133}In were studied at ISOLDE Decay Station (IDS). With hybrid detection system sensitive to β, γ, neutron spectroscopy, comparative partial half-lives (logft) have been measured for all their dominant β-decay channels first time, including low-energy Gamow-Teller transition several first-forbidden (FF) transitions. Uniquely such heavy neutron-rich nucleus, selectively populate only few isolated unbound states in ^{133}Sn....
Abstract The activities of the EUROfusion consortium on development high quality nuclear data for fusion applications include evaluations deuteron induced reactions and related libraries needs DEMO power plant IFMIF-DONES neutron-source analyses. Molybdenum is one major constituents reference stainless steels used in critical components these projects. While TENDL library was current by EUROfusion, need its further improvement has already been pointed out. weak binding energy responsible...
The excited structure of the single-hole nucleus <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"><a:mmultiscripts><a:mi>Sn</a:mi><a:mprescripts/><a:none/><a:mn>131</a:mn></a:mmultiscripts></a:math> populated by <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"><b:msup><b:mi>β</b:mi><b:mo>−</b:mo></b:msup></b:math> decay <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"><c:mmultiscripts><c:mi>In</c:mi><c:mprescripts/><c:none/><c:mn>131</c:mn></c:mmultiscripts></c:math> was...
In the present work, a dedicated experimental study of lifetimes in Te and Sb isotopes was undertaken at 9 MV Tandem accelerator IFIN-HH. Beams 11B 35 MeV impinged on natAg target to populate nuclei interest their decay using activation method. The emitted gamma rays charged particles were detected by ROSPHERE SORCERER arrays. Lifetimes decaying isomeric ground states 117Te 115,117Sb measured. results update existing literature data from half century ago employing new reaction mechanism...
The $B(E3)$ transition strengths in $^{90}\mathrm{Zr}$ and $^{91}\mathrm{Zr}$ isotopes were determined based on the half-life measurements of first ${3}^{\ensuremath{-}}$ ${(11/2)}^{\ensuremath{-}}$ states, i.e., ${T}_{1/2}=7.8(16)$ ps 500(16) ps, respectively. plunger method fast-timing techniques employed. values 16(3) 20.5(7) W.u. for derived, pointing to a sizable octupole collectivity both cases. value complements systematics strength even-even Zr isotopic chain, revealing smooth trend...
Background: Specific noncompound processes such as breakup (BU) and distinct direct reactions (DR) make deuteron-induced different from with other incident particles. Significant discrepancies measured cross sections were caused by taking into account only the pre-equilibrium emission (PE) compound-nucleus (CN) mechanisms while microscopic calculation of inclusive BU DR is still investigated numerically. Thus, reaction recommended most recently for high-priority elements are based on data...