V. Bildstein
A5019209432- Nuclear physics research studies
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Quantum Chromodynamics and Particle Interactions
- Radiation Detection and Scintillator Technologies
- Advanced Chemical Physics Studies
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Neutrino Physics Research
- Radiation Therapy and Dosimetry
- X-ray Spectroscopy and Fluorescence Analysis
- Advanced NMR Techniques and Applications
- Superconducting Materials and Applications
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Particle accelerators and beam dynamics
- Quantum, superfluid, helium dynamics
- Radiopharmaceutical Chemistry and Applications
- Rare-earth and actinide compounds
- Astro and Planetary Science
- Mass Spectrometry Techniques and Applications
- Scientific Research and Discoveries
- Inorganic Fluorides and Related Compounds
- Radioactive Decay and Measurement Techniques
University of Guelph
2016-2025
Lawrence Berkeley National Laboratory
2019
Pierce College
2019
Michigan State University
2019
University of Massachusetts Lowell
2019
Bangor University
2019
Colorado School of Mines
2019
Idaho National Laboratory
2019
Université de Strasbourg
2019
Centre National de la Recherche Scientifique
2019
The Miniball germanium detector array has been operational at the REX (Radioactive ion beam EXperiment) post accelerator Isotope Separator On-Line facility ISOLDE CERN since 2001. During last decade, a series of successful Coulomb excitation and transfer reaction studies have performed with this array, utilizing unique high-quality radioactive beams which are available ISOLDE. In article, an overview is given technical details full setup, including description $\gamma$ -ray particle...
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.
Lead-208 is the heaviest known doubly magic nucleus and its structure therefore of special interest. Despite this magicity, which acts to provide a strong restorative force toward sphericity, it exhibit both octupole correlations some strongest quadrupole collectivity observed in systems. In Letter, we employ state-of-the-art experimental equipment conclusively demonstrate, through four Coulomb-excitation measurements, presence large, negative, spectroscopic moment for vibrational <a:math...
The neutron-rich nuclei 94,96Kr were studied via projectile Coulomb excitation at the REX-ISOLDE facility CERN. Level energies of first excited 2(+) states and their absolute E2 transition strengths to ground state are determined discussed in context E(2(1)(+)) B(E2;2(1)(+)→0(1)(+)) systematics krypton chain. Contrary previously published results no sudden onset deformation is observed. This experimental result supported by a new proton-neutron interacting boson model calculation based on...
From detailed spectroscopy of 110Cd and 112Cd following the β+/electron-capture decay 110,112In β− 112Ag, very weak branches from nonyrast states are observed. The transition rates determined measured branching ratios level lifetimes obtained with Doppler-shift attenuation method inelastic neutron scattering reveal collective enhancements that suggestive a series rotational bands. In 110Cd, γ band built on shape-coexisting intruder configuration is suggested. For 112Cd, 2+ 3+ γ-band members...
At the radioactive ion beam facility REX-ISOLDE, neutron-rich zinc isotopes were investigated using low-energy Coulomb excitation. These experiments have resulted in $B(E2,{2}_{1}^{+}\ensuremath{\rightarrow}{0}_{1}^{+})$ values $^{74\ensuremath{-}80}\mathrm{Zn}$, $B(E2,{4}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})$ $^{74,76}\mathrm{Zn}$ and determination of energy first excited ${2}_{1}^{+}$ states $^{78,80}\mathrm{Zn}$. The produced by high-energy proton- $(A=74,76,80)$ neutron- $(A=78)$...
Neutron-rich, radioactive Zn isotopes were investigated at the Radioactive Ion Beam facility REX-ISOLDE (CERN) using low-energy Coulomb excitation. The energy of 2(1)+ state in 78Zn could be firmly established and for first time 2+ --> 0(1)+ transition 80Zn was observed 1492(1) keV. B(E2,2(1)+ 0(1)+) values extracted (74,76,78,80)Zn compared to large scale shell model calculations. With only two protons outside Z=28 proton core, is lightest N=50 isotone which spectroscopic information has...
The 1789 keV state in 30Mg was identified as the first excited 0+ via its electric monopole (E0) transition to ground state. measured small value of rho2(E0,0(2)+-->0(1)+)=(26.2+/-7.5)x10(-3) implies within a two-level model mixing competing configurations with largely different intrinsic quadrupole deformation near neutron shell closure at N=20. Axially symmetric configuration calculations identify be based on below N=20 closure, while mainly consists two neutrons into nu 1f7/2 orbital....
From detailed spectroscopy of $^{110}\mathrm{Cd}$ and $^{112}\mathrm{Cd}$ following the ${\ensuremath{\beta}}^{+}/\mathrm{EC}$ decay $^{110,112}\mathrm{In}$ ${\ensuremath{\beta}}^{\ensuremath{-}}$ $^{112}\mathrm{Ag}$, presence very weak branches from nonyrast states is revealed. In $^{112}\mathrm{Cd}$, ${2}_{5}^{+}\ensuremath{\rightarrow}{0}_{4}^{+}$ ${4}_{6}^{+}\ensuremath{\rightarrow}{2}_{5}^{+}$ transitions are observed that yield...
The excited states of N=44 ^{74}Zn were investigated via γ-ray spectroscopy following ^{74}Cu β decay. By exploiting γ-γ angular correlation analysis, the 2_{2}^{+}, 3_{1}^{+}, 0_{2}^{+}, and 2_{3}^{+} in firmly established. branching E2/M1 mixing ratios for transitions deexciting measured, allowing extraction relative B(E2) values. In particular, 2_{3}^{+}→0_{2}^{+} 2_{3}^{+}→4_{1}^{+} observed first time. results show excellent agreement with new microscopic large-scale shell-model...
We report on the first radioactive beam experiment performed at recently commissioned REX-ISOLDE facility CERN in conjunction with highly efficient gamma spectrometer MINIBALL. Using 30Mg ions accelerated to an energy of 2.25 MeV/u together a thin (nat)Ni target, Coulomb excitation excited 2+ states projectile and target nuclei well below barrier was observed. From measured relative deexcitation gamma-ray yields B(E2;0(+)gs-->2(+)1) value determined be 241(31)e2 fm4. Our result is lower than...
A high-statistics \(\beta \)-decay experiment was conducted at the TRIUMF-ISAC facility using \(8\pi \) \(\gamma \)-ray spectrometer and its ancillary detectors to study low-spin structure of \(^{98}\)Zr. The analysis \)–\(\gamma \(e^-\)–\(\gamma coincidence data is presented. New measurements branching ratios mixing are reported for four \(J^{\pi } = 2^+\) states located above 2 MeV excitation energy in Based on these measurements, \(B\)(E2) values transitions lower-lying levels determined,...
A campaign of Coulomb-excitation experiments to study the electromagnetic structure \(^{110}\)Cd was performed using beams \(^{14}\)N, \(^{32}\)S, and \(^{60}\)Ni. The use various reaction partners enables disentangling contributions individual matrix elements involved in excitation process, yielding, among others, a precise determination lifetime 2\(^+_2\) state \(^{110}\)Cd. Abstract Published by Jagiellonian University 2025 authors
Calculation of the thermonuclear $^{30}\mathrm{P}$($p$,\ensuremath{\gamma})$^{31}\mathrm{S}$ rate in oxygen-neon nova explosions depends critically upon nuclear structure information for states within \ensuremath{\sim}600 keV ${}^{30}\mathrm{P}+p$ threshold $^{31}\mathrm{S}$. We have studied $^{31}\mathrm{P}$(${}^{3}\mathrm{He},t$)$^{31}\mathrm{S}$ reaction at 25 MeV using a high-resolution quadrupole-dipole-dipole-dipole magnetic spectrograph. Tritons corresponding to...
Coulomb-excitation experiments are performed with postaccelerated beams of neutron-deficient $^{196,198,200,202}\mathrm{Po}$ isotopes at the REX-ISOLDE facility. A set matrix elements, coupling low-lying states in these isotopes, is extracted. In two heaviest $^{200,202}\mathrm{Po}$, transitional and diagonal elements ${2}_{1}^{+}$ state determined. $^{196,198}\mathrm{Po}$ multistep Coulomb excitation observed, populating ${4}_{1}^{+},\phantom{\rule{0.28em}{0ex}}{0}_{2}^{+}$, ${2}_{2}^{+}$...
The bound states of ${}^{12}$Be have been studied through a ${}^{11}$Be${(d,p)}^{12}$Be transfer reaction experiment in inverse kinematics. A 2.8 MeV/u beam ${}^{11}$Be was produced using the REX-ISOLDE facility at CERN. outgoing protons were detected with T-REX silicon detector array. MINIBALL germanium array used to detect gamma rays from excited ${}^{12}$Be. gamma-ray detection enabled clear identification four known ${}^{12}$Be, and each has individually. Differential cross sections over...
The isotopes Cd122,124,126 were studied in a “safe” Coulomb-excitation experiment at the radioactive ion-beam facility REX-ISOLDE CERN. reduced transition probabilities B(E2;0g.s.+→21+) and limits for quadrupole moments of first 2+ excited states three determined. onset collectivity vicinity Z=50 N=82 shell closures is discussed by comparison with model beyond mean-field calculations.2 MoreReceived 20 December 2013DOI:https://doi.org/10.1103/PhysRevC.89.014313©2014 American Physical Society
How does nature hold together protons and neutrons to form the wide variety of complex nuclei in Universe? Describing many-nucleon systems from fundamental theory quantum chromodynamics has been greatest challenge answering this question. The chiral effective field description nuclear force now makes possible but requires certain parameters that are not uniquely determined. Defining needs identification observables sensitive different parametrizations. From a measurement proton elastic...
Lifetimes of $2^+_1$ and $4^+_1$ states, as well some negative-parity non-yrast in $^{188-200}$Hg were measured using $\gamma-\gamma$ electronic fast timing techniques with the LaBr$_3$(Ce) detector array GRIFFIN spectrometer. The excited states populated $\epsilon/\beta^+$-decay $J^\pi =7^+/2^-$ $^{188-200}$Tl produced at TRIUMF-ISAC facility. deduced B(E2) values are compared to different interacting boson model predictions. precision achieved this work over previous ones allows for a...