J. Dopfer

ORCID: 0009-0007-9235-4824
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About
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Research Areas
  • Nuclear physics research studies
  • Astronomical and nuclear sciences
  • Particle physics theoretical and experimental studies
  • Atomic and Subatomic Physics Research
  • Particle Detector Development and Performance
  • Advanced X-ray Imaging Techniques
  • Nuclear reactor physics and engineering
  • Electron and X-Ray Spectroscopy Techniques
  • Nuclear Physics and Applications
  • X-ray Spectroscopy and Fluorescence Analysis
  • Atomic and Molecular Physics
  • Particle Accelerators and Free-Electron Lasers
  • Astro and Planetary Science

Michigan State University
2022-2024

University of Massachusetts Lowell
2024

Excited-state spectroscopy from the first Facility for Rare Isotope Beams (FRIB) experiment is reported. A 24(2)-$\mu$s isomer was observed with FRIB Decay Station initiator (FDSi) through a cascade of 224- and 401-keV $\gamma$ rays in coincidence $^{32}\textrm{Na}$ nuclei. This only known microsecond ($1{\text{ }\mu\text{s}}\leq T_{1/2} < 1\text{ ms}$) region. nucleus at heart $N=20$ island shape inversion crossroads spherical shell-model, deformed ab initio theories. It can be represented...

10.1103/physrevlett.130.242501 article EN Physical Review Letters 2023-06-13

New half-lives for exotic isotopes approaching the neutron drip-line in vicinity of N∼28 Z=12-15 were measured at Facility Rare Isotope Beams (FRIB) with FRIB decay station initiator. The first experimental results are compared to latest quasiparticle random phase approximation and shell-model calculations. Overall, consistent available theoretical descriptions suggest a well-developed region deformation below ^{48}Ca N=28 isotones. erosion Z=14 subshell closure Si is experimentally...

10.1103/physrevlett.129.212501 article EN publisher-specific-oa Physical Review Letters 2022-11-14

The astrophysical origin for the chemical elements between first and second $r$-process peaks is a matter of intense debate, with number nucleosynthesis processes at explosive stellar environments possibly contributing to their production. Modeling neutron-capture that would produce these requires reliable data on trends neutron separation energies neutron-rich isotopes which are highly unstable not readily accessible by experiment. This work describes application an experimental technique,...

10.1103/physrevc.109.035806 article EN Physical review. C 2024-03-28

Background: The established GAseous Detector with GErmanium Tagging (GADGET) detection system is used to measure weak, low-energy β-delayed proton decays.It consists of the gaseous Proton equipped a MICROMEGAS (MM) readout detect protons and other charged particles calorimetrically, surrounded by Segmented Germanium Array (SeGA) for high-resolution prompt γ-rays.Purpose: To upgrade GADGET's operate as compact Time Projection Chamber (TPC) detection, 3D imaging identification singleand...

10.1103/physrevc.110.035807 article EN Physical review. C 2024-09-12

Excited-state spectroscopy from the first Facility for Rare Isotope Beams (FRIB) experiment is reported. A 24(2)-$μ$s isomer was observed with FRIB Decay Station initiator (FDSi) through a cascade of 224- and 401-keV $γ$ rays in coincidence $^{32}\textrm{Na}$ nuclei. This only known microsecond ($1{\text{ }μ\text{s}}\leq T_{1/2} &lt; 1\text{ ms}$) region. nucleus at heart $N=20$ island shape inversion crossroads spherical shell-model, deformed ab initio theories. It can be represented as...

10.48550/arxiv.2302.11607 preprint EN other-oa arXiv (Cornell University) 2023-01-01
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