A. M. Rogers
A5025367439- Nuclear physics research studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- Nuclear reactor physics and engineering
- Advanced Chemical Physics Studies
- Atomic and Subatomic Physics Research
- Astro and Planetary Science
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Advanced NMR Techniques and Applications
- Particle accelerators and beam dynamics
- Gamma-ray bursts and supernovae
- Medical Imaging Techniques and Applications
- Particle Detector Development and Performance
- Quantum, superfluid, helium dynamics
- Superconducting Materials and Applications
- Radiation Therapy and Dosimetry
- Rare-earth and actinide compounds
- Magnetic confinement fusion research
- X-ray Spectroscopy and Fluorescence Analysis
- Astrophysics and Cosmic Phenomena
- Cold Fusion and Nuclear Reactions
University of Massachusetts Lowell
2015-2025
Children's Hospital of Pittsburgh
2025
The University of Queensland
2022-2024
The University of Melbourne
2024
Ecosystem Sciences
2024
Argonne National Laboratory
2011-2022
RELX Group (Netherlands)
2022
Stanford Synchrotron Radiation Lightsource
2018
Stanford University
2018
SLAC National Accelerator Laboratory
2018
This is an exciting time for the study of r-process nucleosynthesis. Recently, a neutron star merger GW170817 was observed in extraordinary detail with gravitational waves and electromagnetic radiation from radio to γ rays. The very red color associated kilonova suggests that mergers are important site. Astrophysical simulations core collapse supernovae making rapid progress. Detection both electron neutrinos antineutrinos next galactic supernova will constrain composition neutrino-driven...
Recent measurements of pre-equilibrium neutron and proton transverse emission from (112,124)Sn+(112,124)Sn reactions at 50 MeV/A have been completed the National Superconducting Cyclotron Laboratory. Free nucleon ratios are compared to those A=3 mirror nuclei. Comparisons made BUU transport calculations conclusions concerning density dependence asymmetry term nuclear equation-of-state sub-nuclear densities made. The double-ratio neutron-proton between two is employed as a means reducing...
We report the first observation of ^{108}Xe→^{104}Te→^{100}Sn α-decay chain. The α emitters, ^{108}Xe [E_{α}=4.4(2) MeV, T_{1/2}=58_{-23}^{+106} μs] and ^{104}Te [E_{α}=4.9(2) T_{1/2}<18 ns], decaying into doubly magic ^{100}Sn were produced using a fusion-evaporation reaction ^{54}Fe(^{58}Ni,4n)^{108}Xe, identified with recoil mass separator an implantation-decay correlation technique. This is time radioactivity has been observed to heavy self-conjugate nucleus. A previous benchmark for...
Spectroscopic factors have been extracted for proton-rich $^{34}\mathrm{Ar}$ and neutron-rich $^{46}\mathrm{Ar}$ using the ($p$, $d$) neutron transfer reaction. The experimental results show little reduction of ground state spectroscopic factor nucleus compared to that $^{46}\mathrm{Ar}$. suggest correlations, which generally reduce such factors, do not depend strongly on neutron-proton asymmetry in this isotopic region as was reported knockout reactions. present are consistent with from...
We have measured fragment cross-sections of projectile fragmentation reactions using primary beams $^{40}\mathrm{Ca}$, $^{48}\mathrm{Ca}$, $^{58}\mathrm{Ni}$, and $^{64}\mathrm{Ni}$ at 140 MeV/nucleon on $^{9}\mathrm{Be}$ $^{181}\mathrm{Ta}$ targets. The were obtained by integrating the momentum distributions isotopes with $Z\ensuremath{\geqslant}5$ in A1900 separator. compare extracted to predictions empirical parametrization (EPAX).
The low-spin level scheme of ${}^{68}$Ni was investigated following two-neutron-knockout and multinucleon-transfer reactions. energy the first excited state determined to be ${E}_{x}({0}_{2}^{+})=1603.5(3)$ keV. Relative $B(E2)$ transition probabilities were deduced compared with shell-model calculations using several modern effective interactions. Theory reproduces data well, but indicates substantial mixing multi-particle, multi-hole configurations for lowest observed ${0}^{+}$ ${2}^{+}$ states.
The clustering of $\ensuremath{\alpha}$ particles in atomic nuclei results the self-organization various geometrical arrangements at femtometer scale. one-dimensional alignment multiple is known as linear-chain structure, evidence which has been highly elusive. We show via resonant elastic and inelastic scattering a radioactive $^{10}\mathrm{Be}$ beam that excited states neutron-rich nucleus $^{14}\mathrm{C}$ agree with recent predictions structure based on an antisymmetrized molecular...
Received 9 September 1964DOI:https://doi.org/10.1103/PhysRevLett.13.636©1964 American Physical Society
Two isomers decaying by electromagnetic transitions with half-lives of 4.7(1.1) and $247(73)\text{ }\text{ }\ensuremath{\mu}\mathrm{s}$ have been discovered in the heavy $^{254}\mathrm{Rf}$ nucleus. The observation shorter-lived isomer was made possible a novel application digital data acquisition system. were interpreted as ${K}^{\ensuremath{\pi}}={8}^{\ensuremath{-}}$, ${\ensuremath{\nu}}^{2}(7/{2}^{+}[624],9/{2}^{\ensuremath{-}}[734])$ two-quasineutron ${K}^{\ensuremath{\pi}}=1{6}^{+}$,...
The structure of semi-magic 2870Ni42 was investigated following complementary multinucleon-transfer and secondary fragmentation reactions. Changes to the higher-spin, presumed negative-parity states based on observed γ-ray coincidence relationships result in better agreement with shell-model calculations using effective interactions neutron f5/2pg9/2 model space. second 2+ (4+) states, however, can only be successfully described when proton excitations across Z=28 shell gap are included....
An exponential dependence of the fragmentation cross section on average binding energy is observed and reproduced with a statistical model. The functional robust allows extraction energies from measured sections. From systematics Cu isotope sections, $^{76,77,78,79}\mathrm{Cu}$ have been extracted. They are $636.94\ifmmode\pm\else\textpm\fi{}0.4,647.1\ifmmode\pm\else\textpm\fi{}0.4,651.6\ifmmode\pm\else\textpm\fi{}0.4$, $657.8\ifmmode\pm\else\textpm\fi{}0.5$ MeV, respectively. Specifically,...
The location of electron capture heat sources in the crust accreting neutron stars depends on masses extremely neutron-rich nuclei. We present first results from a new implementation time-of-flight technique to measure nuclear rare isotopes at National Superconducting Cyclotron Laboratory. 16 nuclei scandium -- nickel range were determined simultaneously, improving accuracy compared previous data 12 cases. $^{61}${V}, $^{63}${Cr}, $^{66}${Mn}, and $^{74}${Ni} measured for time with mass...
Single-neutron-transfer measurements using ($p$,$d$) reactions have been performed at 33 MeV per nucleon with proton-rich $^{34}\mathrm{Ar}$ and neutron-rich $^{46}\mathrm{Ar}$ beams in inverse kinematics. The extracted spectroscopic factors are compared to the large-basis shell-model calculations. Relatively weak quenching of is observed between $^{46}\mathrm{Ar}$. experimental results suggest that neutron correlations a dependence on asymmetry nucleus over this isotopic region. present...
We report the observation of a very exotic decay mode at proton drip line, β-delayed γ-proton decay, clearly seen in β Tz=−2 nucleus Zn56. Three sequences have been observed after decay. Here this mode, already sd shell, is for first time fp shell. Both γ and decays taken into account estimation Fermi Gamow-Teller strengths. Evidence fragmentation strength due to strong isospin mixing found.Received 13 February 2014DOI:https://doi.org/10.1103/PhysRevLett.112.222501© 2014 American Physical Society
In the pursuit of identifying rare two-particle events within GADGET II Time Projection Chamber (TPC), this paper presents a comprehensive approach for leveraging Convolutional Neural Networks (CNNs) and various data processing methods. To address inherent complexities 3D TPC track reconstructions, is expressed in 2D projections 1D quantities. This capitalizes on diverse modalities TPC, allowing efficient representation distinct features events, with no loss topology uniqueness....