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M a i n    H E P D    a ch i e v e m e n t s
BOOKLET "High Energy Physics Division PNPI. Main scientific activities."
BOOKLET "The proton synchrocyclotron SC-1000 turned 50 years old."

PNPI Reports: PNPI 2007-2012 (28 Mb) PNPI 2010-2013(5,6 Mb), PNPI 2014(9 Mb),
PNPI 2015(6,7 Mb)

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   Investigation of spatial distributions of the nuclear matter in exotic neutron-rich nuclei.

Experiment IKAR
Experiment IKAR (GSI, Darmstadt)

Heads of the PNPI group:    G.D. Alkhazov, A.V. Khanzadeev

A new method was proposed at PNPI for investigation of spatial nuclear structure of exotic nuclei by elastic scattering of the studied nuclei on protons at an energy of ~1 GeV/nucleon using an active hydrogen target (ionization spectrometer IKAR) developed at PNPI. The investigations were carried out at the Nuclear Centre of Heavy Nuclei GSI (Darmstadt, Germany). The following nuclei were investigated: : 6He, 8He, 8Li, 9Li, 11Li, 8B, 7Be, 9Be, 10Be, 11Be, 12Be, 14Be, 13C, 14C, 15C, 17C. As a result, unique information on the distributions of the nuclear matter, on the sizes of the nuclear core and halo in the investigated nuclei has been obtained.

   Production and investigation of short-lived nuclei.

*IRIS* Experiment
Experiments IRIS   and   ISOLDE (CERN)

Heads of the PNPI groups:    V.N. Panteleev (IRIS, IRINA), A.E. Barzakh (ISOLDE)

A unique nuclear-laser complex ULISS has been built at the PNPI synchrocyclotron. This complex is used for production and investigation of exotic nuclei near the boarders of nuclear stability by the method of resonant ionization spectrometry in a laser ion source. This method was proposed and realized for the first time at PNPI at the mass-separator complex IRIS. With this method at PNPI and ISOLDE(CERN), a number of experiments were performed with the aim to determine charge radii and electromagnetic moments in about 80 neutron-deficient nuclei:
192-211, 216-219Po,   178-207Tl,   197-211, 217At     177-182, 185,191Au. The obtained results are important for theory of nuclear structure.
        In experiments performed at ISOLDE (CERN), a new nuclear process has been discovered: asymmetric delayed fission of the nucleus 180Tl. The delayed asymmetric fission of nuclei with such a small ratio N/Z as N/Z = 1.25 has been established reliably for the first time. The observed asymmetric nuclear fission is in contradiction with the data on low-energy fission of nuclei lighter than Ac. The observation of this new fission mode demands a dedicated theoretical interpretation. Laser-spectroscopic experiments at CERN are considered to be among the most important investigations, and they will be carried on after modernization of the ISOLDE complex.

project *IRINA*
At present, a similar mass-separator complex IRINA for investigations of the neutron-excess nuclei which will be produced at the high-flux neutron reactor PIK is under design. This complex will provide a record-breaking high yield of neutron-rich nuclei. The shape and spatial structure of these nuclei will be studied using a laser ion source. Moreover, at the IRINA complex it is planned to build a Penning ion trap for precision measurements of nuclear masses of nuclei far from the line of nuclear stability. Such investigations are important for theory of atomic nuclei and for astrophysics as well.

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Last update on:   by   Svetlana F. Udalova