Superheavy Nuclide & Nuclear Structure Group

The laboratory carries out experimental studies on the synthesis and structure of neutron-deficient nuclei, using the state-of-the-art facilities of a gas-filled recoil separator, SHANS (Spectrometer for Heavy Atoms and Nuclear Structure), and a HPGe gamma-ray detector array at HIRFL, as well as other scientific facilities around the world. Recently, with the commissioning of the China Accelerator Facility for Superheavy Elements (CAFE2), a new gas-filled recoil separator, SHANS2, is running successfully. Meanwhile, a novel device, MRTOF mass spectrometer for the precise mass measurement of short-lived nuclei, is under construction. For the coming HIAF facility, the laboratory is responsible for the development of a high-precision low-energy spectrometer for nuclear structure study.

 

Recent Highlights

We reinvestigated nuclear excitation by electron capture (NEEC) using isomer beam from RIBLL and evidence of isomer depletion was not observed. Results were published in Physical Review Letters on June 17. The NEEC probability was measured to be less than 2×10-5, thus casting doubt on the first reported experimental observation of NEEC in 2018. 

We have recently synthesized a new isotope thorium-207, and discovered a regular and distinct odd-even staggering (OES) in α-decay energies for nuclei with Z>82 and N<126. The study has been published as a Letter in Physical Review C on May 19. 

New isotope 214U has been observed by scientisits from our group and collaborators and published in Phys. Rev. Lett. 126 (2021) 152502 as an Editors’ Suggestion on April 14. It has revealed for the first time the abnormal enhancement of α-particle clustering in uranium isotopes. This result has also been reported by Physics.

New very short-lived isotope 222Np has been observed by scientisits from our group and collaborators and published in Phys. Rev. Lett. 125 (2020) 032502. This has been reported not only by medias from China, but also from abroad. The following are links: