A5067411918- Nuclear physics research studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Quantum Chromodynamics and Particle Interactions
- Advanced NMR Techniques and Applications
- Particle Detector Development and Performance
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Radiation Detection and Scintillator Technologies
- Advanced Chemical Physics Studies
- Atomic and Subatomic Physics Research
- Rare-earth and actinide compounds
- Astro and Planetary Science
- High-Energy Particle Collisions Research
- Particle accelerators and beam dynamics
- X-ray Spectroscopy and Fluorescence Analysis
- Photocathodes and Microchannel Plates
- Dark Matter and Cosmic Phenomena
- Quantum, superfluid, helium dynamics
- Particle Accelerators and Free-Electron Lasers
- Radiation Therapy and Dosimetry
- Scientific Research and Discoveries
- Electron and X-Ray Spectroscopy Techniques
- Boron and Carbon Nanomaterials Research
University of York
2008-2024
University of Warsaw
2024
National Centre for Nuclear Research
2024
Instituto de Estructura de la Materia
2024
Lawrence Berkeley National Laboratory
2010-2023
Technical University of Darmstadt
2012-2020
GSI Helmholtz Centre for Heavy Ion Research
2015-2019
University of Giessen
1998-2019
University of Liverpool
2005-2018
Florida State University
2017-2018
The new, neutron-deficient, superheavy element isotope ²⁸⁵114 was produced in ⁴⁸Ca irradiations of ²⁴²Pu targets at a center-of-target beam energy 256 MeV (E*=50 MeV). α decay ²⁸⁵114was followed by the sequential four daughter nuclides, 281Cn, 277Ds, 273Hs, and 269Sg. 265Rf observed to spontaneous fission. measured α-decay Q values were compared with those from macroscopic-microscopic nuclear mass model give insight into shell effects. The²⁴²Pu (⁴⁸Ca,5n²)²⁸⁵114 cross section 0.6(-0.5)+0.9 pb.
Excited states in $^{38,40,42}\mathrm{Si}$ nuclei have been studied via in-beam $\ensuremath{\gamma}$-ray spectroscopy with multinucleon removal reactions. Intense radioactive beams of $^{40}\mathrm{S}$ and $^{44}\mathrm{S}$ provided at the new facility RIKEN Radioactive Isotope Beam Factory enabled $\ensuremath{\gamma}\mathrm{\text{\ensuremath{-}}}\ensuremath{\gamma}$ coincidence measurements. A prominent $\ensuremath{\gamma}$ line observed an energy 742(8) keV $^{42}\mathrm{Si}$ confirms...
Intermediate-energy Coulomb excitation measurements are performed on the N ≥ 40 neutron-rich nuclei (66,68)Fe and (64)Cr. The reduced transition matrix elements providing a direct measure of quadrupole collectivity B(E2;2(1)(+) → 0(1)(+)) determined for first time in (68)Fe(42) (64)Cr(40) confirm previous recoil distance method lifetime measurement (66)Fe(40). results compared to state-of-the-art large-scale shell-model calculations within full fpgd neutron orbital model space using...
Quasifree one-proton knockout reactions have been employed in inverse kinematics for a systematic study of the structure stable and exotic oxygen isotopes at ${\mathrm{R}}^{3}\mathrm{B}/\mathrm{LAND}$ setup with incident beam energies range $300--450\text{ }\mathrm{MeV}/\mathrm{u}$. The isotopic chain offers large variation separation that allows quantitative understanding single-particle strength changing isospin asymmetry. provide complementary approach to intermediate-energy one-nucleon...
A new experimental technique is presented using proton-$\ensuremath{\gamma}\mathrm{\text{\ensuremath{-}}}\ensuremath{\gamma}$ correlations from $^{94}\mathrm{Mo}(d,p)^{95}\mathrm{Mo}$ reactions which allows for the model-independent extraction of photon strength function at various excitation energies primary $\ensuremath{\gamma}$-ray decay quasicontinuum to individual low-lying levels. Detected particle provide entrance into residual nucleus while transitions levels specify discrete states...
One of the most exotic light neutron-rich nuclei currently accessible for experimental study is 40Mg, which lies at intersection nucleon magic number N=28 and neutron drip line. Low-lying excited states 40Mg have been studied first time following a one-proton removal reaction from 41Al, performed Radioactive Isotope Beam Factory RIKEN Nishina Center with DALI2 γ-ray array ZeroDegree spectrometer. Two transitions were observed, suggesting an excitation spectrum that shows unexpected...
Quasi-free scattering reactions of the type (p,2p) were measured for first time exclusively in complete and inverse kinematics, using a 12C beam at an energy ∼400MeV/u as benchmark. This new technique has been developed to study single-particle structure exotic nuclei experiments with radioactive-ion beams. The outgoing pair protons fragments simultaneously, enabling unambiguous identification reaction channels redundant measurement kinematic observables. Both valence deeply-bound nucleon...
The atomic masses of ^{55}Sc, ^{56,58}Ti, and ^{56-59}V have been determined using the high-precision multireflection time-of-flight technique. radioisotopes produced at RIKEN's Radioactive Isotope Beam Factory (RIBF) delivered to novel designed gas cell system, which has recently commissioned downstream ZeroDegree spectrometer following BigRIPS separator. For ^{56,58}Ti ^{56-59}V, mass uncertainties reduced down order 10 keV, shedding new light on N=34 shell effect in Ti V isotopes by first...
In this work, we computed the equation of state dense QCD in presence background magnetic fields using lattice simulations at imaginary baryon chemical potential. Our include 2+1+1 flavors stout-smeared staggered fermions with masses physical point and a tree-level Symanzik-improved gauge action. Using several expansion schemes, tuned our simulation parameters such that satisfies strangeness neutrality isospin asymmetry constraints, which are relevant to phenomenology heavy-ion collisions....
In this article, we discuss some aspects of the quenching single-particle strength with emphasis on isospin dependence long- and short-range correlations. A phenomenological analysis that connects recent Jefferson Laboratory studies data spectroscopic factors, is contrasted results Dispersive Optical Model approach. We consider consequences model nature dressed nucleons in nuclear medium, their effective masses, as well other structure such charge radii, charges, spin-spin Qualitative...
Using a method whereby molecular and atomic ions are independently selected, an isobarically pure beam of $^{70}\mathrm{Se}$ was postaccelerated to energy 206 MeV using REX-ISOLDE. Coulomb-excitation yields for states in the target nuclei were deduced by recording deexcitation $\ensuremath{\gamma}$ rays highly segmented MINIBALL $\ensuremath{\gamma}$-ray spectrometer coincidence with scattered particles silicon detector. At these energies, yield first ${2}^{+}$ state is expected be strongly...
Establishing how and when large N/Z values require modified or new theoretical tools is a major quest in nuclear physics. Here we report the first measurement of lifetime 2+1 state near-dripline nucleus 20C. The deduced value τ2+1=9.8±2.8(stat)+0.5−1.1(syst) ps gives reduced transition probability B(E2;2+1→0+g.s.)=7.5+3.0−1.7(stat)+1.0−0.4(syst) e2 fm4 good agreement with shell model calculation using isospin-dependent effective charges.Received 21 January...
Excited states in 16C were populated via the 9Be(17N,16C+γ)X one-proton knockout reaction. The lifetime of 21+ state was measured using recoil distance method. extracted τ21+=11.4−0.9+0.8(stat)±0.7(systBρ)−1.5+0.0(systfeeding) ps yields a deduced B(E2;21+→01+)=4.21−0.26+0.34(stat)−0.24+0.28(systBρ)−0.00+0.64(systfeeding)e2fm4 value good agreement with previous measurement. cross section is used to extract proton amplitude state, which confirms neutron dominant character this state. Gamma-ray...
We propose a phenomenological approach to examine the role of short- and long-range nucleon-nucleon correlations in quenching single-particle strength atomic nuclei their evolution asymmetric neutron matter. These are thought be reason for spectroscopic factors observed $\rm (e,e'p)$, (p,2p)$ transfer reactions. show that recently increase high-momentum component protons neutron-rich is consistent with reduced proton factors. Our connects recent results on short-range from high-energy...
The transition quadrupole moments, $Q_{\rm t}$, of four weakly populated collective bands up to spin $\sim$ $65\hbar$ in $^{157,158}$Er have been measured be ${\sim}11 {\rm eb}$ demonstrating that these sequences are associated with large deformations. However, the data inconsistent calculated values from cranked Nilsson-Strutinsky calculations predict lowest energy triaxial shape rotation about short principal axis. appear favor either a stable rotating intermediate axis or, alternatively,...
Excited states in ${}^{18}$C were populated by the one-proton knockout reaction of an intermediate energy radioactive ${}^{19}$N beam. The lifetime first ${2}^{+}$ state was measured with K\"oln/NSCL plunger via recoil distance method to be $\ensuremath{\tau}({2}_{1}^{+})=22.4\ifmmode\pm\else\textpm\fi{}0.9{(\mathrm{stat})}_{\ensuremath{-}2.2}^{+3.3}(\mathrm{syst})$ ps, which corresponds a reduced quadrupole transition strength...
A measurement of the direct two-proton removal from $^{42}\mathrm{Si}$ has provided first structural information on $N=28$ isotone $^{40}\mathrm{Mg}$. The value for inclusive cross section 40${}_{\ensuremath{-}17}^{+27}$ $\ensuremath{\mu}$b is significantly lower than that predicted by structure calculations using recent SDPF-MU shell-model effective interaction combined with eikonal reaction theory. This observed discrepancy consistent interpretation only one low-lying 0${}^{+}$ states in...
The quasi-free scattering reactions 11C(p,2p) and 10,11,12C(p,pn) have been studied in inverse kinematics at beam energies of 300–400 MeV/u the R3B-LAND setup. outgoing proton-proton proton-neutron pairs were detected coincidence with reaction fragments kinematically complete measurements. efficiency to detect these has obtained from GEANT4 simulations which tested using 12C(p,2p) 12C(p,pn) reactions. Experimental cross sections momentum distributions compared DWIA calculations based on...
Excited states in the extremely neutron-deficient nucleus Pb180 have been identified for first time using JUROGAM II array conjunction with RITU recoil separator at Accelerator Laboratory of University Jyväskylä. This study lies limit what is presently achievable in-beam spectroscopy, an estimated cross section only 10 nb Mo92(Zr90,2n)Pb180 reaction. A continuation trend observed Pb182 and Pb184 seen, where prolate minimum continues to rise beyond N=104 midshell respect spherical ground...
The ground state of the proton-rich nucleus 23Al has been studied by one-proton removal on a carbon target at about 50 MeV/nucleon using EXOGAM + SPEG experimental setup GANIL. Longitudinal momentum distributions 22Mg breakup fragments, inclusive and in coincidence with γ rays de-exciting residues, were measured. ground-state structure is found to be configuration mixing d-orbital valence proton coupled four core states—0+gs, 2+1, 4+1, 4+2. We confirm spin parity as Jπ=5/2+. measured...