Latest News----Institute of Modern Physics

Generalized Isobaric Multiplet Mass Equation and its Application to the Nolen-Schiffer Anomaly

The Wigner isobaric multiplet mass equation (IMME) is the most fundamental prediction in nuclear physics with the concept of isospin. However, it was deduced based on the Wigner-Eckart theorem with the assumption that all charge-violating interactions can be written as tensors of rank two. This should be generalized for a general situation. In addition, the Nolen-Schiffer anomaly is a longstand...The Wigner isobaric multiplet mass equation (IMME) is the most fundamental prediction in nuclear physics with the concept of isospin. However, it was deduced based on the Wigner-Eckart theorem with...

| 12 12, 2018

Neutron Star Cooling with a Dynamic Stellar Structure

Neutron star cooling is a hot topic that connects nuclear physics and astrophysics. The observations combined with theory of neutron star (NS) cooling play a crucial role in achieving the intriguing information of the stellar interior, such as the equation of state, composition, and superfluidity of dense matter. The traditional NS cooling theory is based on the assumption that the stellar stru...Neutron star cooling is a hot topic that connects nuclear physics and astrophysics. The observations combined with theory of neutron star (NS) cooling play a crucial role in achieving the intriguin...

| 12 12, 2018

HHG-XUV Laser Lights in Reaction Microscope for Ultrafast Dynamics Studies in Lanzhou

On 5th December 2018, at the Institute of Modern Physics, Chinese Academy of Sciences in Lanzhou, the Atomic and Molecular Dynamics Team succeeded in putting the XUV laser produced by high-harmonic generation (HHG) method and the associated reaction microscope into operation, and the first kinematically-complete experiment on photoionization of atoms by XUV photon has been initiated which is al...On 5th December 2018, at the Institute of Modern Physics, Chinese Academy of Sciences in Lanzhou, the Atomic and Molecular Dynamics Team succeeded in putting the XUV laser produced by high-harmonic...

| 07 12, 2018

A Benchmark Reaction Involving H Migration, H–H Combination, and C–H Bond Cleavage in Dissociation of [HCCH]²⁺ Induced by Ion Impact

A benchmark dissociation channel of [HCCH]2+ →H2+ + C2+ is found in the fragmentation of C2H2 initiated by alpha-particle irradiation. The research was conducted by the atomic physics group led by Professor Xinwen Ma through the collaboration with School of Science, Xi’an Jiaotong University and Department of Chemistry, City University of Hong Kong.A benchmark dissociation channel of [HCCH]2+ →H2+ + C2+ is found in the fragmentation of C2H2 initiated by alpha-particle irradiation. The research was conducted by the atomic physics group led by...

| 07 12, 2018

Progress in Fabrication of UC Ceramic Nuclear Fuel at IMP

Uranium dioxide nuclear fuel has been widely used in pressurized water reactors (PWR), because of its high melting point, isotropic expansion, excellent radiation behaviors and mechanical properties. However, it is easy to embrittlement and the thermal conductivity is quite low. Compared with traditional uranium oxides nuclear fuel, the uranium carbide has extremely high hardness and no phase t...Uranium dioxide nuclear fuel has been widely used in pressurized water reactors (PWR), because of its high melting point, isotropic expansion, excellent radiation behaviors and mechanical propertie...

| 12 09, 2018

Important Progress of the Elastic Scattering Measurement of the Proton Drip-line Nucleus ¹⁷F on Medium-mass Target at Energies near the Coulomb Barrier

Elastic scattering of halo nuclei is one of the hot topics in nuclear physics. Many experimental and theoretical efforts have been done on the elastic scattering of neutron halo nuclei at energies near the Coulomb barrier and the suppression of the Coulomb rainbow peak is observed. Elastic scattering of halo nuclei is one of the hot topics in nuclear physics. Many experimental and theoretical efforts have been done on the elastic scattering of neutron halo nuclei at energies ...

| 11 06, 2018

Progress in Fabrication of Simulated Ceramic Nuclear Fuel Spheres

Under the cooperation between PSI and IMP, the chemical kinetics of the internal gelation process was systematically investigated, and it indicated that the process can be accomplished quickly by adjusting the composition of the feed solution. Therefore, an improved internal gelation process, which combined the in-situ instant mixing of room-temperature precursor solutions with microwave-assist...The closed nuclear fuel cycle has important strategic significance for the sustainable development of nuclear energy. The reutilization of spent fuel is the most important step of the closed nuclea...

| 09 03, 2018

Fixing the Primordial Lithium Problem in Big Bang Nucleosynthesis

Recently, an international nuclear astrophysical team led by Suqing Hou (Institute of Modern Physics, Chinese Academy of Sciences) and Jianjun He (Institute of Modern Physics & National Astronomical Observatories, Chinese Academy of Sciences), proposed an elegant solution to this problem by introducing non-extensive statistics. The authors show that using a slightly modified version of the clas...Big Bang is regarded as the most successful model to describe the origination and evolution of universe currently. The model describes how the universe expanded from a very high density and high te...

| 29 12, 2017

Discovery of the New Isotope ²¹⁹Np

Recently the researchers from IMP(Institute of Modern Physics, Chinese Academy of Sciences) reported the discovery of a new isotope 219Np, which was produced via the fusion reaction 187Re(36Ar,4n)219Np at the gas-filled recoil separator SHANS (Spectrometer for Heavy Atoms and Nuclear Structure) at the Heavy Ion Research Facility in Lanzhou (HIRFL). Recently the researchers from IMP(Institute of Modern Physics, Chinese Academy of Sciences) reported the discovery of a new isotope 219Np, which was produced via the fusion reaction 187Re(36Ar,4n)...

| 29 12, 2017

New Short-lived Isotope ²²³Np was Identified

New short-lived isotope 223Np was discovered at the SHANS gas-filled separator in IMP. The experimental results indicate the absence of the Z = 92 sub-shell closure around N = 126.New short-lived isotope 223Np was discovered at the SHANS gas-filled separator in IMP. The experimental results indicate the absence of the Z = 92 sub-shell closure around N = 126.
　　The existenc...

| 21 07, 2017