A5085619582- Nuclear physics research studies
- Nuclear Physics and Applications
- Astronomical and nuclear sciences
- Atomic and Molecular Physics
- Particle Detector Development and Performance
- Radiation Detection and Scintillator Technologies
- Advanced Chemical Physics Studies
- Advanced NMR Techniques and Applications
- Muon and positron interactions and applications
- Rare-earth and actinide compounds
- Atomic and Subatomic Physics Research
- Dark Matter and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Chronic Obstructive Pulmonary Disease (COPD) Research
- Quantum Chromodynamics and Particle Interactions
- Homelessness and Social Issues
- Gamma-ray bursts and supernovae
- Molecular Spectroscopy and Structure
- Neutrino Physics Research
- Superconducting Materials and Applications
- Quantum, superfluid, helium dynamics
- Emergency and Acute Care Studies
- X-ray Spectroscopy and Fluorescence Analysis
- Contemporary Literature and Criticism
- Psychoanalysis and Psychopathology Research
Michigan State University
2020-2024
Facility for Rare Isotope Beams
2024
National Superconducting Cyclotron Laboratory
2020-2023
Alberta Health Services
2020
University of Virginia
2015-2018
The $B(E2,\phantom{\rule{0.16em}{0ex}}{0}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})$ strengths of $^{36}\mathrm{Ca}$ and $^{38}\mathrm{Ca}$ are measured to be 131(20) ${e}^{2}{\mathrm{fm}}^{4}$ 101(11) ${e}^{2}{\mathrm{fm}}^{4}$, respectively. $B(E2)$ value for required a measurement the $p$/$\ensuremath{\gamma}$ branching ratio because ${2}^{+}$ state is proton unbound. This ${B}_{p}=0.087(8)$. These branching-ratio values can reproduced in shell-model with ZMB2 interaction, an...
In the Ge-Sr mass region, isotopes with neutron number $N \leq 40$ are known to feature rapid shape changes both nucleon and angular momentum. To gain new insights into their structure, inelastic proton scattering experiments in inverse kinematics were performed on rare $^{74,76}$Kr. This work focuses observables related $J^{\pi} = 4^+_1$ states of Kr and, particular, hexadecapole degree freedom. By performing coupled-channels calculations, deformation parameters $\beta_4$ determined for...
The electromagnetic properties of $^{126,128}\mathrm{Xe}$ were studied in subbarrier Coulomb excitation measurements performed at the National Superconducting Cyclotron Laboratory Re-accelerator facility, ReA3, Michigan State University (MSU). $^{126}\mathrm{Xe}$ and $^{128}\mathrm{Xe}$ nuclei accelerated to 3.74 3.81 MeV/nucleon, respectively, impinged on $^{196}\mathrm{Pt}$ $^{208}\mathrm{Pb}$ targets. $\ensuremath{\gamma}$ rays deexciting populated low-lying states detected coincidence...
The region of neutron-rich Cr isotopes has garnered much attention in recent years due to a rapid onset collectivity near neutron number $N=40$. We report here on the first $\ensuremath{\gamma}$-ray spectroscopy beyond $({4}_{1}^{+})$ state $^{62,64}\mathrm{Cr}$, using nucleon removal reactions from several projectiles within rare-isotope beam cocktail. A candidate for ${6}^{+}$ $^{64}\mathrm{Cr}$ is presented as well one for, possibly, second excited ${0}^{+}$ $^{62}\mathrm{Cr}$. results...
Bound states of the neutron-deficient, near-dripline nucleus $^{36}$Ca were populated in two-neutron removal from ground state $^{38}$Ca, a direct reaction sensitive to single-particle configurations and couplings removed neutrons projectile wave function. Final-state exclusive cross sections for formation corresponding longitudinal momentum distributions, both determined through combination particle $\gamma$-ray spectroscopy, are compared predictions combining eikonal theory shell-model...
Enhanced octupole collectivity is expected in the neutron-deficient Ge, Se, and Kr isotopes with neutron number $N\ensuremath{\approx}40$ has indeed been observed for $^{70,72}\mathrm{Ge}$. Shape coexistence configuration mixing are, however, a notorious challenge theoretical models trying to reliably predict this mass region, which known feature rapid shape changes changing nucleon spin of system. To further investigate microscopic configurations causing prolate-oblate-triaxial transition...
The discrepancy between observations from γ-ray astronomy of the Fe60/Al26 flux ratio and recent calculations is an unresolved puzzle in nuclear astrophysics. stellar β-decay rate Fe59 one major uncertainties impeding us a precise prediction. important Gamow-Teller strengths low-lying states to Co59 ground state are measured for first time using exclusive measurement Co59(t,He3+γ)Fe59 charge-exchange reaction. new decay factor 3.5±1.1 larger than currently adopted at T=1.2 GK. Stellar...
In-beam $\gamma$-ray spectroscopy was used to study excited states of the neutron-deficient nucleus $^{37}$K populated in fast-beam inelastic-scattering and proton-removal reactions at high-momentum loss. New transitions $\gamma\gamma$ coincidence relationships were established using tracking array GRETINA. The extension level scheme up first $(13/2^-)$ state highlights potential this recently demonstrated population pathway for studies isospin symmetry involving mirror-energy differences....
Abstract Background Chronic obstructive pulmonary disease (COPD) is one of the most common causes mortality and morbidity in high-income countries. In addition to high costs initial hospitalization, COPD patients frequently return emergency department (ED) are readmitted hospital within 30 days discharge. A acute care discharge bundle focused on optimizing for with an exacerbation has been shown reduce ED revisits readmissions. The aim this study was explore understand factors influencing...
The neutron-deficient Ca isotopes continue to attract attention due their importance for testing isospin symmetry and relevance in capture reactions of interest nova nucleosynthesis the shape light curves Type I x-ray bursts. To date, spectroscopic information on $^{38,39}\mathrm{Ca}$ is largely limited data lower-spin excited states. Here, we report in-beam $\ensuremath{\gamma}$-ray spectroscopy complementary higher-spin, complex-structure states $^{39}\mathrm{Ca}$ populated...
The heavy-ion inelastic scattering of the neutron-rich nucleus 29Ne to its excited states was studied using a 100.1 MeV/u rare isotope beam on 181Ta and 9Be targets. combined setup consisting GRETINA array, TRIPLEX device S800 Spectrograph facilitates simultaneous measurements two reactions, providing first measurement transition strengths for this isotope. A sizable E2 strength B(E2↑) which amounts 163(30) e2 fm4 determined in excitation 931-keV state, demonstrating large degree...
We report on the first in-beam $\gamma$-ray spectroscopy of proton-dripline nucleus $^{40}$Sc using two-nucleon pickup onto an intermediate-energy rare-isotope beam $^{38}$Ca. The $^{9}$Be($^{38}$Ca,$^{40}$Sc$+\gamma$)X reaction at 60.9 MeV/nucleon mid-target energy selectively populates states in for which transferred proton and neutron couple to high orbital angular momentum. In turn, due angular-momentum selection rules emission nuclear structure energetics $^{39}$Ca, such then exhibit...
The shape and collectivity of $^{80}\mathrm{Ge}$ were investigated via a sub-barrier-energy Coulomb excitation measurement using the JANUS setup at NSCL ReA3 facility. spectroscopic quadrupole moment ${Q}_{s}({2}_{1}^{+})$ ${2}_{1}^{+}$ state was measured for first time, precision $B(E2;{0}_{1}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})$ transition strength increased. experimental value indicates large, prolate deformation $^{80}\mathrm{Ge}$, which is consistent with large-scale shell-model...
The cosmic-ray-veto detector (CRV) for the Mu2e experiment consists of four layers plastic scintillating counters read out by silicon photo-multipliers (SiPM) through wavelength-shifting fibers. This paper reports light properties several fiber samples with diameters 1.0 mm, 1.4 and 1.8 mm that were considered CRV system. A diameter was selected as optimal CRV, measurements prototype production this are presented. Fiber performance found to exceed requirements >99% spools. performed using a...
The level schemes of the neutron-rich $^{37--42}\mathrm{P}$ isotopes are investigated via in-beam $\ensuremath{\gamma}$-ray spectroscopy following fragmentation a $^{45}\mathrm{Cl}$ projectile beam at intermediate energies. Information on $\ensuremath{\gamma}\ensuremath{\gamma}$ coincidence relationships complemented by comparisons to shell-model calculations in $sd\text{\ensuremath{-}}pf$ model space were used construct excitation for these nuclei. For odd-mass $^{37,39}\mathrm{P}$...
We report experimental data for excited states of ${}^{72,74}\mathrm{Se}$ obtained from proton removal ${}^{73,75}\mathrm{Br}$ secondary beams on a target. The experiments were performed with the Ursinus-NSCL liquid hydrogen target and combined $\mathrm{GRETINA}+\mathrm{S}800$ setup at Coupled Cyclotron Facility National Superconducting Laboratory Michigan State University. Within uncertainties, inclusive cross sections are identical suggesting that same single-particle orbitals contribute...
Lying between $^{16}\mathrm{O}$ and $^{40}\mathrm{Ca}$, the $sd$ shell is well described by robust phenomenological ab initio nuclear theories. In this work, however, we highlight an unexplained reduction in electric-quadrupole strength rare isotope $^{32}\mathrm{Si}$, studied through sub-barrier Coulomb excitation. It found that oblate nature of deformation reproduced, while absolute scale quadrupole deformation, inhibited approximately a factor 2 compared to theoretical predictions....
Excited states in the neutron-rich nucleus $^{68}\mathrm{Fe}$ were populated using a $^{9}\mathrm{Be}$($^{68}\mathrm{Co}, {}^{68}\mathrm{Fe}+\ensuremath{\gamma})\mathrm{X}$ charge-exchange reaction at 95 MeV/u. The new $\ensuremath{\gamma}$-ray transitions reported here for first time complement data from $\ensuremath{\beta}$-decay studies and nucleon knockout reactions. In comparison to shell-model calculations with LNPS effective interaction, two candidate ${6}_{1}^{+}$ level emerge....
The Muon-to-Electron Conversion experiment (Mu2e) will operate at a single event sensitivity of 3x10^{−17} with total background less than 1 over the three-year lifetime experi- ment. To achieve this level background, Cosmic Ray Veto detector (CRV) surround Mu2e apparatus to veto penetrating particles that cause background. CRV is required have detection efficiency 99.99% throughout experiment. comprised extruded polystyrene scintillating strips and fiber which degrade time, decreas- ing...