A5083450655- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Advanced NMR Techniques and Applications
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Cold Atom Physics and Bose-Einstein Condensates
- Astronomical and nuclear sciences
- Astro and Planetary Science
- Quantum chaos and dynamical systems
- Inorganic Fluorides and Related Compounds
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Spectroscopy and Quantum Chemical Studies
- Nuclear reactor physics and engineering
- Quantum many-body systems
- High-pressure geophysics and materials
- Rare-earth and actinide compounds
- Scientific Research and Discoveries
- Physics of Superconductivity and Magnetism
- Geology and Paleoclimatology Research
- Numerical methods for differential equations
- Quantum Computing Algorithms and Architecture
- Radioactive Decay and Measurement Techniques
University of Notre Dame
2015-2024
TRIUMF
2021
San Diego State University
2021
University of Washington
2021
Yale University
2003-2017
Louisiana State University
2010
Grinnell College
2010
University of Toronto
2009
Center for Theoretical Biological Physics
2005-2007
European Centre for Theoretical Studies in Nuclear Physics and Related Areas
2004
New sideband partners of the yrast bands built on pi(h11/2)nu(h11/2) configuration were identified in 55Cs, 57La, and 61Pm N = 75 isotones 134Pr. These form with 134Pr unique doublet-band systematics suggesting a common basis. Aplanar solutions 3D tilted axis cranking calculations for triaxial shapes define left- right-handed chiral systems out three angular momenta provided by valence particles core rotation, which leads to spontaneous symmetry breaking doublet bands. Small energy...
Results for ab initio no-core shell model calculations in a symmetry-adapted SU(3)-based coupling scheme demonstrate that collective modes light nuclei emerge from first principles. The low-lying states of $^{6}\mathrm{Li}$, $^{8}\mathrm{Be}$, and $^{6}\mathrm{He}$ are shown to exhibit orderly patterns favor spatial configurations with strong quadrupole deformation complementary low intrinsic spin values, picture is consistent the nuclear symplectic model. results also suggest pragmatic path...
Lifetimes of states in ${}^{150}\mathrm{Nd}$ were measured using the recoil distance method following Coulomb excitation by a 132 MeV ${}^{32}\mathrm{S}$ beam. The experiment was performed at Yale Tandem accelerator, employing SPEEDY gamma-ray detector array and New Plunger Device. Reduced transition probabilities are compared to predictions critical point symmetry X(5) phase/shape that occurs for $N\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}90$ rare earth isotones. Very good...
The B(E2;0(+)-->2+) values for the first 2+ excited states of neutron-rich 132,134,136Te have been measured using Coulomb excitation radioactive ion beams. B(E2) obtained 132,134Te are in excellent agreement with expectations based on systematics heavy stable Te isotopes, while that 136Te is unexpectedly small. These results discussed terms proton-neutron configuration mixing and shell-model calculations realistic effective interactions.
We present a simple method for discerning the evolution from vibrational to rotational structure in nuclei as function of spin. The prescription is applied yrast cascades A approximately 110 region and clear transition motion found.
Developments and applications are presented of an algebraic version Bohr's collective model. Illustrative examples show that fully converged calculations can be performed quickly easily for a large range Hamiltonians. As result, the Bohr model becomes effective tool in analysis experimental data. The chosen both to confirm reliability diversity results obtained by its use. focus paper is facilitate identification limitations with view developing more realistic, computationally tractable models.
The emergence of rotational bands is observed in no-core configuration interaction (NCCI) calculations for the $\mathrm{Be}$ isotopes ($7\ensuremath{\le}A\ensuremath{\le}12$), as evidenced by patterns excitation energies, electromagnetic moments, and transitions. Yrast low-lying excited are found. results indicate well-developed structure NCCI calculations, using JISP16 realistic nucleon-nucleon within finite, computationally accessible spaces.
High-spin states in the doubly odd $N=75$ nuclei ${}^{136}\mathrm{Pm}$ and ${}^{138}\mathrm{Eu}$ were populated following ${}^{116}\mathrm{Sn}{(}^{24}\mathrm{Mg},p3n)$ ${}^{106}\mathrm{Cd}{(}^{35}\mathrm{Cl},2pn)$ reactions, respectively. A new $\ensuremath{\Delta}I=1$ band is reported data are presented for recently ${}^{136}\mathrm{Pm}.$ Polarization angular correlation measurements have been performed to establish relative spin parity assignments these bands. Both bands assigned same...
In this paper states in ${}^{102}\mathrm{Pd}$ populated the $\ensuremath{\epsilon}/{\ensuremath{\beta}}^{+}$ decay of ${}^{102}\mathrm{Ag},$ produced ${}^{89}\mathrm{Y}{(}^{16}\mathrm{O},3n)$ reaction, were studied with high efficiency Ge detectors. The level scheme is good overall agreement predictions E(5) critical point symmetry, exception ${0}_{2}^{+}$ state, which may be intruder character.
Exact numerical diagonalization is carried out for the Bohr Hamiltonian with a \ensuremath{\beta}-soft, axially stabilized potential. Wave function and observable properties are found to be dominated by strong $\ensuremath{\beta}\text{\ensuremath{-}}\ensuremath{\gamma}$ coupling effects. The validity of approximate separation variables introduced $X(5)$ model, extensively applied in recent analyses transitional nuclei, examined, reasons its breakdown analyzed.
Calculations in ab initio no-core configuration interaction (NCCI) approaches, such as the shell model or full methods, have conventionally been carried out using harmonic-oscillator many-body basis. However, rapid falloff (Gaussian asymptotics) of oscillator functions at large radius makes them poorly suited for description asymptotic properties nuclear wave function. We establish foundations carrying NCCI calculations with an alternative basis built from Coulomb-Sturmian functions. These...
Converged results for E2 observables are notoriously challenging to obtain in ab initio no-core configuration interaction (NCCI) approaches. Matrix elements of the operator sensitive large-distance tails nuclear wave function, which converge slowly an oscillator basis expansion. Similar convergence challenges beset prediction charge radius. However, we exploit systematic correlations between calculated and radius yield meaningful predictions relations among these observables. In particular,...
Excited states of ${}^{156}\mathrm{Dy}$ were populated through ${\ensuremath{\beta}}^{+}/\ensuremath{\varepsilon}$ decay and studied \ensuremath{\gamma}-ray spectroscopy at the Yale Moving Tape Collector. Extensive data led to improved information on electromagnetic properties low-spin a substantially revised level scheme. The structural observables are compared with those other nearby $N=90$ isotones predictions $X(5)$ model for nuclei in spherical-deformed transition region.
The emergence of rotational bands is observed in no-core configuration interaction (NCCI) calculations for the odd-mass Be isotopes (7<=A<=13) with JISP16 nucleon-nucleon interaction, as evidenced by patterns excitation energies, quadrupole moments, and E2 transitions. Yrast low-lying excited are found. results demonstrate possibility well-developed structure NCCI using a realistic interaction.
We identify the ${J}^{\ensuremath{\pi}}{=2}_{3}^{+}$ state of ${}^{96}\mathrm{Ru}$ as proton-neutron mixed-symmetry ${2}_{\mathrm{ms}}^{+}$ this nucleus. This identification is based on measurement transition strengths ${B(M1,2}_{3}^{+}\ensuremath{\rightarrow}{2}_{1}^{+})=0.78(23) {\ensuremath{\mu}}_{N}^{2}$ and ${B(E2;2}_{3}^{+}\ensuremath{\rightarrow}{0}_{1}^{+})=1.6(3)$ W.u. These were obtained from Coulomb excitation yield for population ${2}_{3}^{+}$ relative to ${2}_{1}^{+}$ with known...
The phase structure of a two-fluid bosonic system is investigated. proton-neutron interacting boson model possesses rich involving three control parameters and multiple order parameters. surfaces quantum transition between spherical, axially symmetric deformed, ${\mathrm{S}\mathrm{U}}_{\ensuremath{\pi}\ensuremath{\nu}}^{*}(3)$ triaxial phases are determined.
Lifetimes of the first ${4}^{+}$ and ${6}^{+}$ states in ${}^{104}\mathrm{Mo}$ ${}^{106}\mathrm{Mo}$ have been measured using recoil distance method following spontaneous fission ${}^{252}\mathrm{Cf}.$ The experiment was performed at 88-inch cyclotron Lawrence Berkeley National Laboratory employing Gammasphere array New Yale Plunger Device. Reduced transition probabilities ground state band are compared with predictions critical point symmetry X(5) for phase transitional nuclei between...