Wei-Ping Lin

Bio: Wei-Ping Lin is an academic researcher from Sichuan University. The author has contributed to research in topics: Neutron & Physics. The author has an hindex of 12, co-authored 56 publications receiving 369 citations. Previous affiliations of Wei-Ping Lin include Chinese Academy of Sciences.

Evidence for Z=6 `magic number' in neutron-rich carbon isotopes

Abstract: The nuclear shell structure, which originates in the nearly independent motion of nucleons in an average potential, provides an important guide for our understanding of nuclear structure and the underlying nuclear forces. Its most remarkable fingerprint is the existence of the so-called `magic numbers' of protons and neutrons associated with extra stability. Although the introduction of a phenomenological spin-orbit (SO) coupling force in 1949 helped explain the nuclear magic numbers, its origins are still open questions. Here, we present experimental evidence for the smallest SO-originated magic number (subshell closure) at the proton number 6 in 13-20C obtained from systematic analysis of point-proton distribution radii, electromagnetic transition rates and atomic masses of light nuclei. Performing ab initio calculations on 14,15C, we show that the observed proton distribution radii and subshell closure can be explained by the state-of-the-art nuclear theory with chiral nucleon-nucleon and three-nucleon forces, which are rooted in the quantum chromodynamics.

Charge-changing cross-section measurements of $^{12-16}$C at around $45A$ MeV and development of a Glauber model for incident energies $10A-2100A$ MeV

Abstract: We have measured for the first time the charge-changing cross sections $({\ensuremath{\sigma}}_{\text{CC}})$ of $^{12\text{--}16}\mathrm{C}$ on a $^{12}\mathrm{C}$ target at energies below $100A$ MeV. To analyze these low-energy data, we have developed a finite-range Glauber model with a global parameter set within the optical-limit approximation which is applicable to reaction cross section $({\ensuremath{\sigma}}_{\text{R}})$ and ${\ensuremath{\sigma}}_{\text{CC}}$ measurements at incident energies from $10A$ to $2100A$ MeV. Adopting the proton-density distribution of $^{12}\mathrm{C}$ known from the electron-scattering data, as well as the bare total nucleon-nucleon cross sections and the real-to-imaginary-part ratios of the forward proton-proton elastic scattering amplitude available in the literatures, we determine the energy-dependent slope parameter ${\ensuremath{\beta}}_{pn}$ of the proton-neutron elastic differential cross section so as to reproduce the existing ${\ensuremath{\sigma}}_{\text{R}}$ and interaction cross-section data for $^{12}\mathrm{C}+\phantom{\rule{4pt}{0ex}}^{12}\mathrm{C}$ over a wide range of incident energies. The Glauber model thus formulated is applied to calculate the ${\ensuremath{\sigma}}_{\text{R}}$'s of $^{12}\mathrm{C}$ on a $^{9}\mathrm{Be}$ and $^{27}\mathrm{Al}$ targets at various incident energies. Our calculations show excellent agreement with the experimental data. Applying our model to the ${\ensuremath{\sigma}}_{\text{R}}$ and ${\ensuremath{\sigma}}_{\text{CC}}$ for the so-called neutron-skin $^{16}\mathrm{C}$ nucleus, we reconfirm the importance of measurements at incident energies below $100A$ MeV. The proton root-mean-square radii of $^{12\text{--}16}\mathrm{C}$ are extracted using the measured ${\ensuremath{\sigma}}_{\text{CC}}$'s and the existing ${\ensuremath{\sigma}}_{\text{R}}$ data. The results for $^{12\text{--}14}\mathrm{C}$ are consistent with the values from the electron scatterings, demonstrating the feasibility, usefulness of the ${\ensuremath{\sigma}}_{\text{CC}}$ measurement, and the present Glauber model.

Towards the full realization of the RIBLL2 beam line at the HIRFL-CSR complex.

Abstract: The RIBLL2 in-flight separator at IMP, the secondary beam line between two storage rings at the \blue{\uwave{Heavy Ion Research Facility in Lanzhou (HIRFL-CSR)}}, has been commissioned to study the rare-isotope beam (RIB) physics at around 300 MeV/nucleon for the first time, in combination of the external target facility (ETF). The unambiguous particle identification in mass and charge states for $^{18}$O and $^{40}$Ar fragments has been achieved in recent experiments. A full realization of RIBLL2 will open many potentials to address important RIB physics problems at around 300 MeV/nucleon.

Lectures on Theoretical Physics

Abstract: Vorlesungen uber theoretische Physik Von Prof. Arnold Sommerfeld. Band 1: Mechanik. Vierte, neubearbeitete Auflage. Pp. xii + 276. 18 D. marks. Band 2: Mechanik der deformierbaren Medien. Pp. xv + 376 + 4 plates. 18 D. marks. Band 3: Elektrodynamik. Pp. xvi + 368. 18 D. marks. Band 6: Partielle Differentialgleichungen der Physik. Pp. xiii + 332. 18 D. marks. (Wiesbaden: Dieterich'sche Verlagsbuchhandlung, 1947–1949.)

Energy Levels of Light Nuclei A =1 6

Abstract: An evaluation of A = 16{17 was published in Nuclear Physics A565 (1993), p. 1. This version of A = 16 diers from the published version in that we have corrected some errors discovered after the article went to press. It has also been slightly revised as of May 16 ,200 0t oinclud ehyperlink sfo rreference san dtables. Introductor ytables have been omitted from this manuscript. Also, Reference key numbers have been changed to the NNDC/TUNL format.

Determination of the Equation of State of Dense Matter

Abstract: Nuclear collisions can compress nuclear matter to densities achieved within neutron stars and within core-collapse supernovae. These dense states of matter exist momentarily before expanding. We analyzed the flow of matter to extract pressures in excess of 1034 pascals, the highest recorded under laboratory-controlled conditions. Using these analyses, we rule out strongly repulsive nuclear equations of state from relativistic mean field theory and weakly repulsive equations of state with phase transitions at densities less than three times that of stable nuclei, but not equations of state softened at higher densities because of a transformation to quark matter.