A5076553133- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Atomic and Molecular Physics
- Astronomical and nuclear sciences
- Nuclear Physics and Applications
- Particle physics theoretical and experimental studies
- Advanced NMR Techniques and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- High-Energy Particle Collisions Research
- Quantum, superfluid, helium dynamics
- Advanced Chemical Physics Studies
- Atomic and Subatomic Physics Research
- Pulsars and Gravitational Waves Research
- Superconducting Materials and Applications
- High-pressure geophysics and materials
- Nuclear reactor physics and engineering
- Cold Atom Physics and Bose-Einstein Condensates
- Cosmology and Gravitation Theories
- Electron and X-Ray Spectroscopy Techniques
- Quantum chaos and dynamical systems
- Particle Accelerators and Free-Electron Lasers
- Astro and Planetary Science
- Methane Hydrates and Related Phenomena
- Particle Detector Development and Performance
- Scientific Research and Discoveries
Virginia Military Institute
2014-2024
Tohoku University
2013-2018
Kyoto University
2014
Washington and Lee University
2013-2014
University of Richmond
2008-2010
Saha Institute of Nuclear Physics
2001-2010
Virginia Commonwealth University
2001-2010
Osaka University
1997-2000
RIKEN
1999
Nippon Soken (Japan)
1999
The lifetimes of \ensuremath{\alpha} decays the recently produced isotopes elements 112, 114, 116, and ${}^{294}118$ some decay products are calculated theoretically within WKB approximation by use microscopic \ensuremath{\alpha}-nucleus interaction potentials. We obtain these nuclear potentials folding densities daughter nuclei with M3Y effective interaction, supplemented a zero-range pseudopotential for exchange along density dependence. Spherical charge distributions used calculating...
The existence of long lived superheavy nuclei (SHN) is controlled mainly by spontaneous fission and \ensuremath{\alpha}-decay processes. According to microscopic nuclear theory, spherical shell effects at $Z=114$, 120, 126 $N=184$ provide the extra stability such SHN have enough lifetime be observed. To investigate whether so-called ``stability island'' could really exist around above $Z$, $N$ values, half-lives along with \ensuremath{\beta}-decay are studied. $Z=102$--120 calculated in a...
Spectroscopy of a $^{10}_{\Lambda}$Be hypernucleus was carried out at JLab Hall C using the $(e,e^{\prime}K^{+})$ reaction. A new magnetic spectrometer system (SPL+HES+HKS), specifically designed for high resolution hypernuclear spectroscopy, used to obtain an energy spectrum with 0.78 MeV (FWHM). The well-calibrated present experiment $p(e,e^{\prime}K^{+})\Lambda,\Sigma^{0}$ reactions allowed us determine levels, and binding ground state peak (mixture 1$^{-}$ 2$^{-}$ states) obtained be...
Half-lives of the decays spherical nuclei away from proton drip line by emissions are estimated theoretically. The quantum mechanical tunneling probability is calculated within WKB approximation. Microscopic proton-nucleus interaction potentials obtained single folding densities daughter with M3Y effective supplemented a zero-range pseudopotential for exchange along density dependence. Parameters dependence nuclear matter calculations. Spherical charge distributions used Coulomb potentials....
We have carried out an experiment to search for a neutron-rich hypernucleus, $^6_{\Lambda}$H, by the $^6$Li($\pi^-,K^+$) reaction at $p_{\pi^-}$ =1.2 GeV/$c$. The obtained missing mass spectrum with estimated energy resolution of 3.2 MeV (FWHM) showed no peak structure corresponding $^6_{\Lambda}$H hypernucleus neither below nor above $^4_{\Lambda}$H$+2n$ particle decay threshold. An upper limit production cross section bound was be 1.2 nb/sr 90% confidence level.
The masses and radii of non-rotating rotating configurations pure hadronic stars mixed with self-interacting fermionic asymmetric dark matter are calculated within the two-fluid formalism stellar structure equations in general relativity. Equation State (EoS) nuclear is obtained from density dependent M3Y effective nucleon–nucleon interaction. We consider particle mass 1 GeV. EoS taken two-body repulsive interactions scale strong interactions. explore conditions equal different rotational...
The longitudinal momentum (P(axially)) distributions of one- and two-neutron removal fragments ((21,22)O) 23O from the reaction with a C target at 72 A MeV have been measured for first time using new direct time-of-flight method nearly full acceptance breakup fragments. unexpectedly narrow width 21O ( 115 +/- 34 MeV/c in FWHM) is consistent two neutrons occupying 2s(1/2) orbital 23O. This indicates modification core (22O) structure neutron halo-like sd shell nuclei near drip line. also...
Theoretical estimates of \ensuremath{\alpha}-decay half-lives several nuclei in the decay from element 113 are presented. Calculations a WKB framework using DDM3Y interaction and experimental Q-values good agreement with data. Half-life calculations found to be quite sensitive angular momentum transfers. Calculated lifetime decreases, owing more penetrability as well thinner barrier, Q-value increases. Deviations this predominant behavior observed some recent data may attributed nonzero...
This new mass formula explains the shape of binding energy versus neutron number curve all elements from Li to Bi. A simple comparison one-neutron separation with experimental data clearly delineates positions known old and magic numbers, reveals extra stability at $N=16$ $(Z=7,8),$ $N=14$ $(Z=7--10),$ $Z=14$ $(N=13\ensuremath{-}19),$ $N=6$ $(Z=3--8),$ loss magicity for nuclei $N=8$ $(Z=4)$ $N=20$ $(Z=12--17).$ It supports existence ${}^{32}\mathrm{Ne},$ ${}^{35}\mathrm{Na},$...
Nuclear masses are calculated using the modified Bethe–Weizsäcker mass formula in which isotonic shifts have been incorporated. The results compared with improved liquid drop model shift. Mass excesses predicted by this method compares well microscopic–macroscopic while being much more simple. neutron and proton drip lines shifts.
A simultaneous description of non-strange nuclei and hypernuclei is provided by a single mass formula inspired the spin–flavour SU(6) symmetry breaking. This used to estimate hyperon binding energies lambda, double sigma, cascade theta hypernuclei. The results are found be in good agreement with available experimental data on 'bound' relativistic as well quark mean-field calculations. useful over wide range masses including light nuclei. It not applicable repulsive potential.
The missing mass spectroscopy of the $^{7}_{\Lambda}$He hypernucleus was performed, using $^{7}$Li$(e,e^{\prime}K^{+})^{7}_{\Lambda}$He reaction at Thomas Jefferson National Accelerator Facility Hall C. $\Lambda$ binding energy ground state (1/2$^{+}$) determined with a smaller error than that previous measurement, being $B_{\Lambda}$ = 5.55 $\pm$ 0.10(stat.) 0.11(sys.) MeV. experiment also provided new insight into charge symmetry breaking in p-shell hypernuclear systems. Finally, peak 3.65...
A mass spectroscopy experiment with a pair of nearly identical high-resolution spectrometers and tritium target was performed in Hall at Jefferson Lab. Utilizing the (e,e′K+) reaction, enhancements, which may correspond to possible Λnn resonance ΣNN states, were observed an energy resolution about 1.21 MeV (σ), although greater statistics are needed make definitive identifications. An experimentally measured state provide unique constraint determining Λn interaction, for no scattering data...
Excitation functions for total reaction cross sections, ${\ensuremath{\sigma}}_{R}$, were measured the light, mainly proton-rich nuclei $^{6}\mathrm{Li}$, $^{7}\mathrm{Be}$, $^{10}\mathrm{B}$, $^{9,10,11}\mathrm{C}$, $^{12}\mathrm{N}$, $^{13,15}\mathrm{O}$, and $^{17}\mathrm{Ne}$ incident on a Si telescope at energies between 15 53 MeV/nucleon. The served as target, energy degrader detector. Proton-removal ${\ensuremath{\sigma}}_{2p}$ ${\ensuremath{\sigma}}_{p}$ most of other projectiles,...
Cross sections for the $^{40}\mathrm{Ca}$(p,2p) reactions at 101.3 and 76.1 MeV $^{16}\mathrm{O}$(p,2p) reaction have been measured analyzed using distorted-wave impulse approximation calculations. The sensitivity to choice of distortion parameters, nonlocality corrections, spin-orbit terms in optical potentials studied. For region phase space studied, factorization is found be valid even energies as low MeV. Extracted spectroscopic factors are compatible with shell model estimates.
Cross sections for ($p, \mathrm{pd}$) and \mathrm{pt}$) reactions at 101.3 MeV ($\ensuremath{\alpha}, \ensuremath{\alpha}d$), \ensuremath{\alpha}t$), \ensuremath{\alpha}^{3}\mathrm{He}$) 139.2 have been measured an $^{16}\mathrm{O}$ target. Distorted wave impulse approximation analyses of the data yield spectroscopic factors proton induced which are comparable to shell model estimates. However, alpha values up two orders magnitude larger. The relationship these results similar knockout is...
The density dependence of nuclear symmetry energy is determined from a systematic study the isospin dependent bulk properties asymmetric matter using isoscalar and isovector components M3Y interaction. incompressibility ${K}_{\ensuremath{\infty}}$ for symmetric matter, part ${K}_{\mathrm{asy}}$ isobaric incompressibility, slope $L$ are all in excellent agreement with constraints recently extracted measured isotopic giant monopole resonances even-$A$ Sn isotopes, neutron skin thickness...
Coincidence studies of two protons emitted from $p$+$^{58}\mathrm{Ni}$ at 100 MeV have been carried out. The proton spectra in coincidence with scattered suffering an average energy loss 60 are similar to those resulting 60-MeV incident protons. This suggests that the initial interaction is a bound nucleon and one or both these nucleons initiates cascade leading more complex states.