R. Orlandi
A5103036815- Nuclear physics research studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Nuclear reactor physics and engineering
- Quantum Chromodynamics and Particle Interactions
- Advanced Chemical Physics Studies
- Rare-earth and actinide compounds
- Advanced NMR Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Radioactive Decay and Measurement Techniques
- Astro and Planetary Science
- Nuclear Materials and Properties
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Laser-Plasma Interactions and Diagnostics
- Superconducting Materials and Applications
- Particle physics theoretical and experimental studies
- Nuclear and radioactivity studies
- Graphite, nuclear technology, radiation studies
- Radiation Detection and Scintillator Technologies
- Magnetic confinement fusion research
- Neutrino Physics Research
- Crystallography and Radiation Phenomena
- Radiation Therapy and Dosimetry
Advanced Science Research Center
2015-2024
KU Leuven
2013-2024
Japan Atomic Energy Agency
2015-2024
University of Warsaw
2009-2024
University of Surrey
2014-2024
National Centre for Nuclear Research
2024
Ludwig-Maximilians-Universität München
2023
Horia Hulubei National Institute for R and D in Physics and Nuclear Engineering
2021
Istituto Nazionale di Fisica Nucleare, Sezione di Milano
2009-2021
University of Milan
2009-2021
The β-decay half-lives of 110 neutron-rich isotopes the elements from _{37}Rb to _{50}Sn were measured at Radioactive Isotope Beam Factory. 40 new follow robust systematics and highlight persistence shell effects. data have direct implications for r-process calculations reinforce notion that second (A≈130) rare-earth-element (A≈160) abundance peaks may result freeze-out an (n,γ)⇄(γ,n) equilibrium. In such equilibrium, are important factors determining rare-earth elements, allow a more...
The "island of inversion" nucleus 32 Mg has been studied by a (t, p) two neutron transfer reaction in inverse kinematics at REX-ISOLDE. shape coexistent excited 0+ state identified the characteristic angular distribution protons Δ L=0 transfer. excitation energy 1058 keV is much lower than predicted any theoretical model. low γ-ray intensity observed for decay this indicates lifetime more 10 ns. Deduced spectroscopic amplitudes are compared with occupation numbers from shell-model calculations.
Coulomb-excitation experiments to study electromagnetic properties of radioactive even-even Hg isotopes were performed with $2.85\text{ }\mathrm{MeV}/\mathrm{nucleon}\text{ }\mathrm{mercury}$ beams from REX-ISOLDE. Magnitudes and relative signs the reduced $E2$ matrix elements that couple ground state low-lying excited states in $^{182\ensuremath{-}188}\mathrm{Hg}$ extracted. Information on deformation first ${0}^{+}$ was deduced using quadrupole sum rules approach. Results show is slightly...
Lifetimes of states in the ground-state bands $^{70}\mathrm{Se}$ and $^{72}\mathrm{Se}$ were measured using recoil-distance Doppler shift method. The results deviate significantly from earlier measurements, requiring a revision conclusions drawn recent Coulomb excitation experiment concerning shape $^{70}\mathrm{Se}$. new lead to coherent picture coexistence neutron-deficient selenium krypton isotopes. evolution oblate prolate shapes this mass region is for first time consistently described...
Almost fully stripped Fe ions accelerated up to 0.9 GeV are demonstrated with a 200 TW femtosecond high-intensity laser irradiating micron-thick Al foil impurity on the surface. An energetic low-emittance high-density beam of heavy large charge-to-mass ratio can be obtained, which is useful for many applications, such as compact radio isotope source in combination conventional technology.
Delayed γ-ray cascades, originating from the decay of (6⁺) isomeric states, in very neutron-rich, semimagic isotopes (136,138)Sn have been observed following projectile fission a ²³⁸U beam at RIBF, RIKEN. The wave functions these states are proposed to be predominantly fully aligned pair f(7/2) neutrons. Shell-model calculations, performed using realistic effective interaction, reproduce well energies excited nuclei and measured transition rates, with exception B(E2;6⁺→4⁺) rate ¹³⁶Sn, which...
The level structures of the very neutron-rich nuclei 128Pd and 126Pd have been investigated for first time. In r-process waiting-point nucleus 128Pd, a new isomer with half-life 5.8(8) μs is proposed to spin parity 8(+) associated maximally aligned configuration arising from g(9/2) proton subshell seniority υ=2. For 126Pd, two isomers identified half-lives 0.33(4) 0.44(3) μs. yrast 2(+) energy much higher in than while sequence below similar that N=82 isotone 130Cd. electric quadrupole...
Background: Neutron-rich nuclei with protons in the fp shell show an onset of collectivity around N=40. Spectroscopic information is required to understand underlying mechanism and determine relevant terms nucleon-nucleon interaction that are responsible for evolution structure this mass region. Methods: We report on lifetime measurement first 2+ 4+ states 70,72,74Zn 6+ state 72Zn using recoil distance Doppler shift method. The experiment was carried out at INFN Laboratory Legnaro AGATA...
Fission-fragment mass distributions were measured for ^{237-240}U, ^{239-242}Np, and ^{241-244}Pu populated in the excitation-energy range from 10 to 60 MeV by multinucleon transfer channels reaction ^{18}O+^{238}U at Japan Atomic Energy Agency tandem facility. Among them, data ^{240}U ^{240,241,242}Np observed first time. It was found that all studied nuclides maintain a double-humped shape up highest energy contrast expectations of predominantly symmetric fission due washing out nuclear...
The neutron-rich Fe isotopes from $A=61$ to 66 were studied through multinucleon transfer reactions by bombarding a $^{238}\mathrm{U}$ target with 400 MeV $^{64}\mathrm{Ni}$ beam. Unambiguous identification of prompt \ensuremath{\gamma} rays belonging each nucleus was achieved using coincidence relationships the ions detected in high-acceptance magnetic spectrometer. new data extend our knowledge level structure isotopes, which is discussed terms systematics region and compared large-scale...
The neutron-rich cobalt isotopes up to $A=67$ have been studied through multinucleon transfer reactions by bombarding a ${}^{238}$U target with 460-MeV ${}^{70}$Zn beam. Unambiguous identification of prompt $\ensuremath{\gamma}$ rays belonging each nucleus has achieved using coincidence relationships the ions detected in high-acceptance magnetic spectrometer. new data are discussed terms systematics and interpreted large-scale shell-model calculations $fpgd$ model space. In particular, very...
The $\ensuremath{\gamma}$ decays of neutron-rich Ca isotopes around ${}^{48}$Ca were measured at Legnaro National Laboratory with the PRISMA-CLARA setup, using heavy-ion transfer reactions on ${}^{64}$Ni and ${}^{208}$Pb $\ensuremath{\approx}$6 MeV/A. work shows feasibility to perform full in-beam spectroscopy (in terms angular distributions, polarizations, lifetimes analysis), providing a method that can be further exploited in future heavy targets radioactive beams. For one-neutron...
A low-lying state in 131In82, the one-proton hole nucleus with respect to double magic 132Sn, was observed by its γ decay Iπ=1/2- β-emitting isomer. We identify new at an excitation energy of Ex=1353 keV, which populated both β 131Cd83 and after β-delayed neutron emission from 132Cd84, as previously unknown πp3/2 single-hole 132Sn core. Exploiting this crucial experimental information, shell-model calculations were performed study structure experimentally inaccessible N=82 isotones below...
It is shown that the multinucleon transfer reactions a powerful tool to study fission of exotic neutron-rich actinide nuclei, which cannot be accessed by particle-capture or heavy-ion fusion reactions. In this work, channels 18O + 232Th reaction are used fourteen nuclei 231,232,233,234Th, 232,233,234,235,236Pa, and 234,235,236,237,238U. Identification fissioning their excitation energy performed on an event-by-event basis, through measurement outgoing ejectile particle in coincidence with...
The first measurement of the low-lying states neutron-rich ^{110}Zr and ^{112}Mo was performed via in-beam γ-ray spectroscopy after one proton removal on hydrogen at ∼200 MeV/nucleon. 2_{1}^{+} excitation energies were found 185(11) keV in ^{110}Zr, 235(7) ^{112}Mo, while R_{42}=E(4_{1}^{+})/E(2_{1}^{+}) ratios are 3.1(2), close to rigid rotor value, 2.7(1), respectively. These results compared modern energy density functional based configuration mixing models using Gogny Skyrme effective...
In the EXILL campaign a highly efficient array of high purity germanium (HPGe) detectors was operated at cold neutron beam facility PF1B Institut Laue-Langevin (ILL) to carry out nuclear structure studies, via measurements γ-rays following neutron-induced capture and fission reactions. The setup consisted collimation system producing pencil with thermal equivalent flux about 108 n s−1cm−2 target position negligible halo. surrounded by an eight ten anti-Compton shielded EXOGAM Clover...
Microsecond isomers in the In and Cd isotopes, mass range $A=123\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}130$, were investigated at ILL reactor, Grenoble, using LOHENGRIN spectrometer, through thermal-neutron induced fission reactions of Pu targets. The level schemes odd-mass $^{123--129}\mathrm{In}$ new measurements $\ensuremath{\mu}\mathrm{s}$ half-lives odd-odd $^{126--130}\mathrm{In}$ are reported. However, expected ${8}^{+}$ even-mass isotopes not observed....
Lifetimes of exited states in $^{134}\mathrm{Pr}$ were measured by means the recoil distance Doppler-shift and attenuation techniques. The branching ratios electric or magnetic character transitions also investigated. experiments performed at IReS, Strasbourg, using EUROBALL IV spectrometer, conjunction with inner bismuth germanate ball Cologne coincidence plunger apparatus. Exited populated fusion-evaporation reaction $^{119}\mathrm{Sn}$($^{19}\mathrm{F}$, 4$n$)$^{134}\mathrm{Pr}$. possible...
Neutron rich nuclei around 48Ca have been measured with the CLARA–PRISMA setup, making use of on 64Ni binary reactions, at 5.9 MeV/A. Angular distributions γ rays give evidence, in several transfer channels, for a large spin alignment (≈70%) perpendicular to reaction plane, it possible firmly establish and parities excited states. In case 49Ca, states arising from different types particle–core couplings are, first time, unambiguously identified basis angular distribution, polarization...
We report on the first γ-ray spectroscopy of low-lying states in neutron-rich 98,100Kr isotopes obtained from 99,101Rb(p,2p) reactions at ∼220 MeV/nucleon. A reduction 2+1 state energies beyond N=60 demonstrates a significant increase deformation, shifted neutron number compared to sharper transition observed strontium and zirconium isotopes. State-of-the-art beyond-mean-field calculations using Gogny D1S interaction predict level good agreement with experimental results. The identification...
The level structures of 70Co and 70Ni, populated from the β decay 70Fe, have been investigated using β-delayed γ-ray spectroscopy following in-flight fission a 238U beam. experimental results are compared to Monte-Carlo Shell-Model calculations including pf+g9/2+d5/2 orbitals. strong population (1+) state at 274 keV in is variance with expected excitation energy ∼1 MeV near spherical single-particle estimates. This observation indicates dominance prolate-deformed intruder configurations...
Fragment mass distributions from fission of the excited compound nucleus 178Pt have been deduced measured fragment velocities. The was created at JAEA tandem facility in a complete fusion reaction 36Ar + 142Nd, beam energies 155, 170 and 180 MeV. data are indicative mixture mass-asymmetric mass-symmetric modes associated with higher lower total kinetic fragments, respectively. yields dominated by asymmetric splits, symmetric mode contributing level ≈1/3. This constitutes first observation...
Lifetimes of low-lying excited states the neutron-rich $^{44,46}\mathrm{Ar}$ nuclei, populated via multinucleon transfer reactions, are measured by means differential recoil distance Doppler shift method. The extracted electromagnetic transition probabilities compared with previous intermediate-energy Coulomb-excitation measurements and large-scale shell-model calculations. increase in deduced $B$($E2;{2}^{+}\ensuremath{\rightarrow}{0}^{+}$) probability from $^{44}\mathrm{Ar}$ to...