A5056486252- Nuclear physics research studies
- Quantum Chromodynamics and Particle Interactions
- Atomic and Molecular Physics
- Advanced NMR Techniques and Applications
- Advanced Chemical Physics Studies
- Astronomical and nuclear sciences
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- Astro and Planetary Science
- Neutrino Physics Research
- Nuclear reactor physics and engineering
- Cold Atom Physics and Bose-Einstein Condensates
- Scientific Research and Discoveries
- Solid-state spectroscopy and crystallography
- Quantum, superfluid, helium dynamics
- High-pressure geophysics and materials
- Rare-earth and actinide compounds
- Quantum chaos and dynamical systems
- Particle accelerators and beam dynamics
- Atomic and Subatomic Physics Research
- Electron Spin Resonance Studies
- Particle physics theoretical and experimental studies
- Advanced Theoretical and Applied Studies in Material Sciences and Geometry
- Spacecraft and Cryogenic Technologies
- Advanced Physical and Chemical Molecular Interactions
China Institute of Atomic Energy
2014-2024
Beijing Administration Institute
2023
Institute of Theoretical Physics
2015-2021
Chinese Academy of Sciences
2015-2021
Central Michigan University
2008-2009
University of Notre Dame
2006
National Superconducting Cyclotron Laboratory
2006
Michigan State University
2006
Joint Institute for Nuclear Astrophysics
2006
Peking University
2001-2002
The triaxial-octupole ${Y}_{32}$ correlation in atomic nuclei has long been expected to exist but experimental evidence not clear. We find, order explain the very low-lying ${2}^{\ensuremath{-}}$ bands transfermium mass region, that this exotic effect may manifest itself superheavy elements. Favorable conditions for producing correlations are shown be present deformed single-particle spectrum, which is further supported by quantitative Reflection Asymmetric Shell Model calculations. It...
We present new formulae for the matrix elements of one-body and two-body physical operators in compact forms, which are applicable to arbitrary Hartree-Fock-Bogoliubov wave functions, including those multi-quasiparticle excitations. The test calculations show that our may substantially accelerate process symmetry restoration when applied heavy nuclear system.
We implemented a variation after projection (VAP) algorithm based on triaxially deformed Hartree-Fock-Bogoliubov vacuum state. This is the first projected mean field study that includes all quantum numbers (except parity), i.e., spin ($J$), isospin ($T$) and mass number ($A$). Systematic VAP calculations with $JTA$-projection have been performed for even-even $sd$-shell nuclei USDB Hamiltonian. All ground state energies are within 500 keV above exact shell model values. Our show has two...
The reflection asymmetric shell model has been established by means of the variational procedure and projection method to describe high spin states octupole deformed nuclei. $Q\ensuremath{\cdot}Q$ forces quadrupole, octupole, hexadecapole as well monopole quadrupole pairings are included in Hamiltonian. space is spanned a selected set simultaneous angular momentum- parity-projected BCS multiquasiparticle which intrinsically deformed. general features rotational bands even-even nuclei can be...
The projected configuration interaction method starts from a collection of mean-field wave functions and builds up correlated good symmetry. It relies on the generator coordinator techniques, but it improves past approaches by very efficient selecting basis states. We use same realistic Hamiltonians model spaces as (CI) compare results with full CI calculations in $\mathit{sd}$ $\mathit{pf}$ shell. Examples $^{24}\mathrm{Mg}$, $^{28}\mathrm{Si}$, $^{48}\mathrm{Cr}$, $^{52}\mathrm{Fe}$,...
The T=3/2 isobaric analog state (IAS) in 53Co is firmly established through a comprehensive measurement of β-delayed γ and proton decay 53Ni. determined excitation energy IAS combined with the mass generates precise excess −38333.6(27)keV for IAS, which 70(18) keV lower than previously adopted value. new result solves problem raised by incorrect assignments unexpected deviation from multiplet equation (IMME) at A=53, T=3/2.
The issue of the existence reflection asymmetry in $^{145}\mathrm{Ba}$ has stood for past 30 years without a common conclusion. recent experimental data show number low-lying rotational bands with alternative parities, providing more strict constraints on relevant modeling. With proper octupole deformation, all observed six have been well reproduced by asymmetric shell model (RASM). three deformed neutron single-particle orbitals just above gap 88, $K=1/2,K=3/2$, and $K=5/2$, respectively,...
A comprehensive study of the mass-data-based interaction energy last i proton(s) and j neutron(s) indicates that proton-neutron ${\ensuremath{\epsilon}}_{1p\ensuremath{-}1n}$ in odd-odd nuclei is greater than half average value proton-dineutron ${\ensuremath{\epsilon}}_{1p\ensuremath{-}2n}$ odd-Z diproton-neutron ${\ensuremath{\epsilon}}_{2p\ensuremath{-}1n}$ odd-N nuclei, phenomenon enhancement $n\ensuremath{-}p$ universal. In proton rich generally more remarkable neutron ones. To one's...
A method for calculation of Gamow-Teller transition rates is developed by using the concept Projected Shell Model (PSM). The shell model basis constructed superimposing angular-momentum-projected multiquasiparticle configurations, and nuclear wave functions are obtained diagonalizing two-body interactions in these projected states. Calculation matrix elements PSM framework discussed detail, effects caused residual forces configuration-mixing studied. With this method, it may become possible...
High-spin excited states in the very neutron-rich nucleus $^{114}\mathrm{Rh}$ have been studied by examining prompt $\ensuremath{\gamma}$ rays emitted spontaneous fission of $^{252}\mathrm{Cf}$ with Gammasphere detector array. A high-spin level scheme has established for first time 13 new levels. The is proposed to be built on a ${7}^{\ensuremath{-}}$ state. existence relatively large signature splitting and an yrare band show features which may indicate triaxial deformation. phenomenon...
Based on the Skyrme energy density functional, self-consistent HF calculations have been performed for 16O, and results show that double point group tetrahedral symmetry TdD may play an important role in configuration of many-body fermion system ground state 16O. The corresponding total distribution state, calculated by using wave functions, presents distinct 4α cluster-like structure with Td symmetry. Among others, necessary restoration rotational parity symmetry, plays a crucial occurrence
In this paper, an improvement has been made on the variation after projection (VAP) method, which is crucial in calculations of high-spin states. It turns out that, form trial VAP wave function with spin $J$ can be simplified by adopting just one projected state rather than previously all $(2J+1)$ angular momentum states for each selected reference state, $|\Phi\rangle$. The present show that such simplification still minimizes energy up to a very good approximation. scheme, obtain almost...
A pair of new possible chiral doublet bands has been experimentally identified for the first time in odd-odd nucleus $^{126}\mathrm{Cs}$. The possibility multiple $(\mathrm{M}\ensuremath{\chi}\mathrm{D})$ $^{126}\mathrm{Cs}$ was interpreted by projected shell model (PSM) calculations with a relatively complete configuration space. newly observed and band reported earlier belong to an identical configuration, providing experimental theoretical evidence existence nuclei...
High-spin states in ${}^{126}$I have been investigated by using in-beam $\ensuremath{\gamma}$-ray spectroscopy with the ${}^{124}$Sn(${}^{7}\text{Li},5n$)${}^{126}$I reaction at a beam energy of 48 MeV. The level scheme has extended and modified considerably adding about 80 new $\ensuremath{\gamma}$ rays establishing five bands. configurations tentatively assigned for yrast, yrare, other excited bands help triaxial projected shell-model (TPSM) cranked calculations. first band crossing yrast...
Lifetimes of the yrast states in $^{180}\mathrm{Pt}$ have been measured from ${4}^{+}$ to ${8}^{+}$ using recoil distance Doppler-shift technique coincidence mode. These were populated by reaction $^{156}\mathrm{Gd}(^{28}\mathrm{Si},4n)^{180}\mathrm{Pt}$ at a beam energy 144 MeV. The differential decay curve method was applied determine lifetimes experimental data. $B(E2)$ values extracted increase with increasing spin, implying rotor behavior, but do not show typical shape coexistence where...
In a previous paper we proposed Projected Configuration Interaction method that uses sets of axially deformed single particle states to build up the many body basis. We show choice basis set is essential for efficiency method, and propose newly improved algorithm selecting projected states. also extend our model spaces can accomodate both parities, include odd-multipole terms in effective interaction, such as octupole contributions. %A universal PCI was presented details. Examples $^{52}$Fe,...
We present a novel and simple algorithm in the variation after projection (VAP) approach for non-yrast nuclear states. It is first time that yrast state states can be varied on same footing. The orthogonality among calculated automatically fulfilled by solving Hill-Wheeler equation. This avoids complexity of frequently used Gram-Schmidt orthogonalization, as adopted excited VAMPIR method. Thanks to Cauchy's interlacing theorem matrix theory, sum lowest projected energies with quantum numbers...
The lifetime of the ${2}_{1}^{+}$ state in $^{178}\mathrm{Pt}$ was measured by using fast-timing techniques with high-purity Ge and ${\mathrm{LaBr}}_{3}:\mathrm{Ce}$ array $^{154}\mathrm{Gd}$(${}^{28}\mathrm{Si},4n$) reaction at a beam energy 146 MeV. deduced $B(E2,{2}_{1}^{+}\ensuremath{\rightarrow}{0}_{1}^{+})$ strength is discussed relation to systematics previously reported strengths light even-even ${}^{176--184}\mathrm{Pt}$ isotopes compared calculations generator coordinate method....
Two Garvey-Kelson mass relations are found to be directly related the n-p interaction. In case of same nuclear core, neutron-proton interaction energy between two neutrons and one proton epsilon (2n-1p) is experimentally close that neutron Protons (1n-2p), which equivalent first relation. The sum (1n-2p) protons (2n-2p), leads second Garvey Kelson An explanation these presented. It shown both hold more accurately when core an even-even core.