다중혈관 관상동맥 환자에서 y-문합을 이용하여 양쪽 내흉동맥만을 사용한 우회술의 조기 성적

We use gravitational-wave observations of the binary neutron star merger GW170817 to explore the tidal deformabilities and radii of neutron stars. We perform a Bayesian parameter estimation with the source location and distance informed by electromagnetic observations. We also assume that the two stars have the same equation of state; we demonstrate that, for stars with masses comparable to the component masses of GW170817, this is effectively implemented by assuming that the stars' dimensionless tidal deformabilities are determined by the binary's mass ratio $q$ by ${\mathrm{\ensuremath{\Lambda}}}_{1}/{\mathrm{\ensuremath{\Lambda}}}_{2}={q}^{6}$. We investigate different choices of prior on the component masses of the neutron stars. We find that the tidal deformability and 90% credible interval is $\stackrel{\texttildelow{}}{\mathrm{\ensuremath{\Lambda}}}={222}_{\ensuremath{-}138}^{+420}$ for a uniform component mass prior, $\stackrel{\texttildelow{}}{\mathrm{\ensuremath{\Lambda}}}={245}_{\ensuremath{-}151}^{+453}$ for a component mass prior informed by radio observations of Galactic double neutron stars, and $\stackrel{\texttildelow{}}{\mathrm{\ensuremath{\Lambda}}}={233}_{\ensuremath{-}144}^{+448}$ for a component mass prior informed by radio pulsars. We find a robust measurement of the common areal radius of the neutron stars across all mass priors of $8.9\ensuremath{\le}\stackrel{^}{R}\ensuremath{\le}13.2\text{ }\text{ }\mathrm{km}$, with a mean value of $⟨\stackrel{^}{R}⟩=10.8\text{ }\text{ }\mathrm{km}$. Our results are the first measurement of tidal deformability with a physical constraint on the star's equation of state and place the first lower bounds on the deformability and areal radii of neutron stars using gravitational waves.

Tidal Deformabilities and Radii of Neutron Stars from the Observation of GW170817

Superheavy nuclei from 48 Ca-induced reactions

The limits of the nuclear landscape explored by the relativistic continuum Hartree–Bogoliubov theory

Covariant density functional theory with a few parameters has been widely used to describe the ground- and excited-state properties for nuclei all over the nuclear chart. In order to describe the exotic properties of unstable nuclei, the contribution of the continuum and its coupling with bound states should be treated properly. In this review, the development of the covariant density functional theory in continuum is introduced, including the relativistic continuum Hartree–Bogoliubov theory, the relativistic Hartree–Fock– Bogoliubov theory in continuum and the deformed relativistic Hartree– Bogoliubov theory in continuum. Then the descriptions and predictions for the neutron halo phenomena in both spherical and deformed nuclei will be reviewed. The diffuseness of the nuclear potentials, nuclear shapes and density distributions, and the impact of the pairing correlations on nuclear size are discussed.

https://iopscience.iop.org/article/10.1088/0954-3899/42/9/093101/pdf

Halos in medium-heavy and heavy nuclei with covariant density functional theory in continuum

Surface diffuseness correction in global mass formula

A gas-filled recoil separator, SHANS (Spectrometer for Heavy Atom and Nuclear Structure), constructed at the Institute of Modern Physics in Lanzhou is reported. With the QDQQ magnetic configuration, where D and Q denote the dipole and quadrupole magnets respectively, the apparatus is used to study the heavy nuclei produced in the heavy-ion-induced fusion reactions. The helium gas is filled in the field region of the separator at a pressure of about 1 mbar. The maximum magnetic rigidity of the dipole magnet is 2.9 Tm. With the commissioning of the device, the performance of the separator in several fusion evaporation reactions is investigated.

A gas-filled recoil separator, SHANS

The newneutron-deficient isotope Ac-205 was synthesized in the complete-fusion reaction Tm-169(Ca-40, 4n)Ac-205. The evaporation residues were separated in-flight by the gas-filled recoil separator SHANS in Lanzhou and subsequently identified by the alpha-alpha position and time correlation method. The alpha-decay energy and half-life of Ac-205 were determined to be 7.935(30) MeV and 20(-9)(+97) ms, respectively. Previously reported decay properties of the ground state in Ac-206 were confirmed.

Alpha decay of the new neutron-deficient isotope Ac-205

By using the improved Quantum Molecular Dynamics model, the $^{244}$Pu+$^{244}$Pu, $^{238}$U+$^{238}$U and $^{197}$Au+$^{197}$Au reactions at the energy range of $E_{c.m.}$=800 $MeV$ to 2000 $MeV$ are studied. We find that the production probability of superheavy fragments(SHF) with $Z \geq$ 114 is much higher for $^{244}$Pu+$^{244}$Pu reaction compared with that of $^{238}$U+$^{238}$U reaction and no product of SHF is found for $^{197}$Au+$^{197}$Au. The production probability of SHF is narrowly peaked in incident energy dependence. The decay mechanism of the composite system of projectile and target and the time scale of decay process are explored. The binding energies of superheavy fragments are found to be broadly distributed and their shapes turn out to be exotic form.

Search for possible way of producing super-heavy elements-Dynamic study on damped reactions of 244Pu+244Pu,238$U+238$U and 197Au+197Au

The recent GSI data for proton-induced spallation reactions by using inverse kinematics are analyzed by the improved quantum molecular dynamics model (ImQMD05) merged with the generalized evaporation model (GEM2) and GEMINI model. We find that the model of ImQMD05+GEM2 reproduces the experimental data of mass and charge distributions for proton-induced spallation reactions on heavy targets (208Pb, 238U and 197Au) well and the model of ImQMD05+GEMINI reproduces the ones on light targets (56Fe) well. The experimental data for double differential cross sections of emitted neutrons and protons in intermediate energy proton-induced spallation reactions can also be reproduced well with the same models and this shows that they are not very sensitive to the merged statistical model.

http://iopscience.iop.org/article/10.1088/0954-3899/36/12/125104/pdf

Xizhen Wu

Papers

Surface diffuseness correction in global mass formula

A gas-filled recoil separator, SHANS

Alpha decay of the new neutron-deficient isotope Ac-205

Search for possible way of producing super-heavy elements-Dynamic study on damped reactions of 244Pu+244Pu,238$U+238$U and 197Au+197Au

A study of proton-induced spallation reactions by the improved quantum molecular dynamics model plus statistical decay models