A5029107277- Nuclear physics research studies
- Astronomical and nuclear sciences
- Nuclear Physics and Applications
- Atomic and Molecular Physics
- Gamma-ray bursts and supernovae
- Neutrino Physics Research
- Isotope Analysis in Ecology
- Scientific Research and Discoveries
- Atomic and Subatomic Physics Research
- Mass Spectrometry Techniques and Applications
- Particle physics theoretical and experimental studies
- Advanced X-ray Imaging Techniques
- Radioactive element chemistry and processing
- Quantum Chromodynamics and Particle Interactions
- History and Developments in Astronomy
- Dark Matter and Cosmic Phenomena
- Medical Imaging Techniques and Applications
- Advanced Semiconductor Detectors and Materials
- Boron and Carbon Nanomaterials Research
- Enzyme Structure and Function
- Radioactive contamination and transfer
- Superconductivity in MgB2 and Alloys
- Muon and positron interactions and applications
- Pulsars and Gravitational Waves Research
- Astrophysical Phenomena and Observations
Michigan State University
2018-2025
Facility for Rare Isotope Beams
2023-2025
National Superconducting Cyclotron Laboratory
2018-2023
As a step towards the ultimate goal of high-precision mass measurement doubly magic 100Sn, 103Sn was measured at Low Energy Beam and Ion Trap (LEBIT) located Facility for Rare Isotope Beams (FRIB). Utilizing time-of-flight ion cyclotron resonance technique, uncertainty 3.7 keV achieved, an improvement by more than order magnitude compared to recent performed in 2023 Cooler Storage Ring (CSRe) Lanzhou. Although LEBIT CSRe measurements are agreement, they diverge from experimental value...
We report the first mass measurement of proton-halo candidate $^{22}\mathrm{Al}$ performed with low energy beam ion trap facility's 9.4 T Penning spectrometer at facility for rare isotope beams. This completes information lightest remaining proton-dripline nucleus achievable traps. has been subject recent interest regarding a possible halo structure from observation an exceptionally large isospin asymmetry [J. Lee et al., Large in Si22/O22 Mirror Gamow-Teller transitions reveals...
We report high-precision mass measurements of $^{50--55}\mathrm{Sc}$ isotopes performed at the LEBIT facility NSCL and TITAN TRIUMF. Our results provide a substantial reduction their uncertainties indicate significant deviations, up to 0.7 MeV, from previously recommended values for $^{53--55}\mathrm{Sc}$. The this work an important update description emerging closed-shell phenomena neutron numbers $N=32$ $N=34$ above proton-magic $Z=20$. In particular, they finally enable complete precise...
We report the mass measurement of $^{56}$Cu, using LEBIT 9.4T Penning trap spectrometer at National Superconducting Cyclotron Laboratory Michigan State University. The $^{56}$Cu is critical for constraining reaction rates $^{55}$Ni(p,$\gamma$)$^{56}$Cu(p,$\gamma$)$^{57}$Zn($\beta^+$)$^{57}$Cu bypass around $^{56}$Ni waiting point. Previous recommended excess values have disagreed by several hundred keV. Our new value, ME=$-38 626.7(6.4)$ keV, a factor 30 more precise than suggested value...
We report the first direct measurement of nuclear electron-capture (EC) decay $Q$ value $^{7}\mathrm{Be}\ensuremath{\rightarrow}^{7}\mathrm{Li}$ via high-precision Penning trap mass spectrometry (PTMS). This was performed using LEBIT located at National Superconducting Cyclotron Laboratory/Facility for Rare Isotope Beams (NSCL/FRIB) newly commissioned Batch-Mode Ion-Source (BMIS) to deliver unstable $^{7}\mathrm{Be}^{+}$ samples. With a measured ${Q}_{EC}=861.963(23)$ keV, this result is...
Background: Mainly because of its long half-life and despite scientific relevance, spectroscopic measurements $^{176}\mathrm{Lu}$ forbidden $\ensuremath{\beta}$ decays are very limited lack formulation shape factors. A direct precise measurement Q value is also presently unreported. In addition, the description provides interesting challenges for nuclear theory. The comparison experimental results with theoretical calculations these can help to test underlying models aid interpretation data...
Nuclear mass measurements of isotopes are key to improving our understanding nuclear structure across the chart nuclides, in particular, for determination appearance or disappearance shell closures. We present high-precision neutron-rich Ca, Ti, and V performed at TRIUMF's Ion Trap Atomic science (TITAN) Low Energy Beam (LEBIT) facilities. These were made using TITAN multiple-reflection time-of-flight spectrometer (MR-ToF-MS) LEBIT 9.4T Penning trap spectrometer. In total, 13 masses...
Background: Ultralow $Q$-value $\ensuremath{\beta}$ decays are interesting processes to study with potential applications nuclear $\ensuremath{\beta}$-decay theory and neutrino physics. While a number of ultralow candidates exist, improved mass measurements necessary determine which these energetically allowed.Purpose: To perform precise atomic $^{89}\mathrm{Y}$ $^{139}\mathrm{La}$. Use new along the precisely known masses $^{89}\mathrm{Sr}$ $^{139}\mathrm{Ba}$ energy level data for...
Background: The quadratic isobaric multiplet mass equation (IMME) has been very successful at predicting the masses of analog states in same multiplet, while its coefficients are known to follow specific trends as functions number. Atomic Mass Evaluation 2016 [Chin. Phys. C 41, 030003 (2017)] $^{44}\mathrm{V}$ value results an anomalous negative $c$ coefficient for IMME term; a consequence large uncertainty and unresolved isomeric state. $b$ can provide useful constraints construction...
Background: The understanding and description of forbidden decays provides interesting challenges for nuclear theory. These calculations could help to test underlying models interpret experimental data. Purpose: Compare a direct measurement the $^{138}$La $\beta$-decay $Q$ value with spectrum end-point energy measured by Quarati et al. using LaBr$_3$ detectors [Appl. Radiat. Isot. 108, 30 (2016)]. Use new precise measurements electron capture (EC) values improve theoretical EC probabilities....
Background: The $^{51}\mathrm{Fe}(p,\ensuremath{\gamma})^{52}\mathrm{Co}$ reaction lies along the main rp-process path leading up to $^{56}\mathrm{Ni}$ waiting point. uncertainty in $Q$ value, which determines equilibrium between forward proton-capture and reverse photodisintegration $^{52}\mathrm{Co}(\ensuremath{\gamma},p)^{51}\mathrm{Fe}$ reaction, contributes considerable rate temperature range of interest for Type I x-ray bursts thus an $\ensuremath{\approx}10%$ burst ashes lighter than...
Isobaric quintets provide the best test of isobaric multiplet mass equation (IMME) and can uniquely identify higher order corrections suggestive isospin symmetry breaking effects in nuclear Hamiltonian. The Generalized IMME (GIMME) is a novel microscopic interaction theory that predicts an extension to quadratic form IMME. Only $A=20, 32$ $T=2$ have exotic $T_z = -2$ member ground state determined high-precision by Penning trap spectrometry. In this work, we establish $A=36$ as third quintet...
Background: Low-energy $\ensuremath{\beta}$ and electron-capture (EC) decays are important systems in neutrino mass determination experiments. An isotope with an ultralow-$Q$-value decay to excited state the daughter ${Q}_{\mathrm{es}}<1$ keV could provide a promising alternative candidate for future $^{75}\mathrm{Se}$ EC $^{75}\mathrm{Ge}\phantom{\rule{4pt}{0ex}}\ensuremath{\beta}$ represent such candidates, but more precise of common daughter, $^{75}\mathrm{As}$, is required evaluate...
Background: Light curves are the primary observable of type-I x-ray bursts. Computational burst models must match simulations to observed light curves. Most error in simulated comes from uncertainties $rp$ process reaction rates, which can be reduced via precision mass measurements neutron-deficient isotopes path.Purpose: Perform a precise atomic measurement $^{27}\mathrm{P}$. Use this new calculate rates and input these into an model reduce curve uncertainty. $^{27}\mathrm{P}$ validate...
As a step towards the ultimate goal of high-precision mass measurement doubly-magic $^{100}$Sn, $^{103}$Sn was measured at Low Energy Beam and Ion Trap (LEBIT) located Facility for Rare Isotope Beams (FRIB). Utilizing time-of-flight ion cyclotron resonance (ToF-ICR) technique, uncertainty 3.7~keV achieved, an improvement by more than order magnitude compared to recent performed in 2023 Cooler Storage Ring (CSRe) Lanzhou. Although LEBIT CSRe measurements are agreement, they diverge from...
We performed a Penning trap mass measurement of $^{61}{\rm Zn}$ at the National Superconducting Cyclotron Laboratory and NuShellX calculations $^{62}{\rm Ga}$ structure using GXPF1A Hamiltonian to obtain improved estimates Zn}(p,\gamma)^{62}{\rm $^{60}{\rm Cu}(p,\gamma)^{61}{\rm reaction rates. Surveying astrophysical conditions for type-I X-ray bursts with code MESA, implementing our rates, taking into account updated nuclear masses V}$ Cr}$ from recent literature, we refine neutrino...
We report a high-precision mass measurement of $^{24}\mathrm{Si}$, performed with the Low Energy Beam and Ion Trap (LEBIT) facility at National Superconducting Cyclotron Laboratory. The atomic excess, $10\phantom{\rule{0.16em}{0ex}}753.8$(37) keV, is factor 5 more precise than previous results. This substantially reduces uncertainty $^{23}\mathrm{Al}(p,\ensuremath{\gamma})^{24}\mathrm{Si}$ reaction rate, which key part rapid proton capture ($rp$) process powering type I x-ray bursts. updated...
Light curves are the primary observable of type-I x-ray bursts. Computational burst models must match simulations to observed light curves. Most error in simulated comes from uncertainties $rp$ process reaction rates, which can be reduced via precision mass measurements neutron-deficient isotopes path. We perform a precise Penning trap measurement $^{27}$P utilizing ToF-ICR technique. use this calculate rates and input these into an model reduce curve uncertainty. also validate Isobaric...
We report the first mass measurement of proton-halo candidate $^{22}$Al performed with LEBIT facility's 9.4~T Penning trap spectrometer at FRIB. This completes information for lightest remaining proton-dripline nucleus achievable traps. has been subject recent interest regarding a possible halo structure from observation an exceptionally large isospin asymmetry [Phys. Rev. Lett. \textbf{125} 192503 (2020)]. The measured excess value $\text{ME}=18\;093.6(7)$~keV, corresponding to small proton...