PNPI Group Leader:    G. D. Alkhazov

       According to the PNPI proposal, exotic nuclei with halos, such as ⁶He, ⁸He,¹¹Li were studied at the GSI Nuclear Centre (Darmstadt) by the method of small-angle proton elastic scattering in inverse kinematics. Nuclei of secondary beams obtained at the output of the FRS fragment separator installed on the SIS heavy ion accelerator at GSI were scattered on the IKAR hydrogen-filled ionization chamber, which serves as both a target and a recoil proton detector. The angle of the scattered nuclei was also measured with multi-wire proportional chambers. As a result, the differential cross sections for elastic scattering of 0.7 GeV protons on exotic nuclei were measured at small momentum transfers. The measured cross sections have allowed us to obtain information on the spatial distribution of the nuclear matter in the studied nuclei. In total, the differential cross sections for proton scattering on nuclei ⁶He, ⁸He, ⁶Li, ⁸Li, ⁹Li, ¹¹Li, ¹²Be, ¹⁴Be, ⁷Be, ⁸B, ¹⁴C, ¹⁵C, ¹⁶C, and ¹⁷C have been measured.

The data obtained clearly indicate the existence of a significant neutron halo in the nuclei ⁶He, ⁸He, ¹¹Li, ¹²Be, ¹⁴Be, ¹⁵C and a proton halo in ⁸B.

(This research is described in more detail in the following papers:

"EXPERIMENTAL STUDY OF THE NUCLEAR SPATIAL STRUCTURE OF NEUTRON-RICH He AND Li ISOTOPES" in PNPI HEPD Report " MAIN SCIENTIFIC ACTIVITIES of High Energy Physics Division in 2002-2006" - page 176,

"STUDY OF THE NUCLEAR MATTER DISTRIBUTIONS IN THE ^12,14Be NUCLEI" in the PNPI report " MAIN SCIENTIFIC ACTIVITIES of High Energy Physics Division in 2007-2012" - page 208,

""NUCLEAR MATTER DISTRIBUTIONS IN THE CARBON, BERILLIUM, AND BORON ISOTOPES DETERMINED IN MEASUREMENTS WITH THE DETECTOR IKAR AT GSI" in the PNPI report " MAIN SCIENTIFIC ACTIVITIES of High Energy Physics Division in 2013-2018" - page 258).

PNPI Group Leader:    Professor Yu. N. Novikov

(Projects in which the Laboratory of Physics of Exotic Nuclei is involved).
One of the main quantities characterizing the properties of any quantum-mechanical system is mass, that is, the total binding energy of this system. Throughout the history of the development of physics of the microworld, mass spectrometry has occupied a prominent place in an effort to achieve maximum accuracy and, thus, to reach new frontiers of fundamental physics. Currently, Penning ion traps, in which one ion is held by magnetic and electric fields in a small volume in a state of almost rest, have the properties of the highest accuracy, reliability and unprecedented sensitivity (at the level of detection of one particle). In terms of accuracy, such traps have already surpassed by many orders of magnitude measurements in storage rings of relativistic particles, which until recently were the most accurate in the nuclear and atomic physics of radioactive nuclides. There are no more than ten such research traps in the world, of which five operate in Europe, and the Laboratory of the Physics of Exotic Nuclei of the HEPD NRC KI - PNPI participates in the operation of each of the European Facilities.

       (More detailed information about all projects: Project SHIPTRAP, Projects ISOLTRAP and JYFLTRAP, Project PENTATRAP, Project ECHo, Project PITRAP, in which the Laboratory of Exotic Nuclei Physics participates, read in the file "LPEN_projects_en.pdf"", also (see Booklet).

Pages:   1   2   3   4   5   6   7