In deep inelastic multinucleon transfer reactions of 48Ca + 248Cm we observed about 100 residual nuclei with proton numbers between Z=82 and Z=100. Among them, there are five new neutron-deficient ...isotopes: 216U, 219Np, 223Am, 229Am and 233Bk. As separator for the transfer products we used the velocity filter SHIP of GSI while the isotope identification was performed via the α decay chains of the nuclei. These first results reveal that multinucleon transfer reactions together with here applied fast and sensitive separation and detection techniques are promising for the synthesis of new isotopes in the region of heaviest nuclei.
.
The results for nuclei above curium, produced in multi-nucleon transfer reactions of
48
Ca +
248
Cm at the velocity filter SHIP of GSI Darmstadt, are presented. Spontaneous fission and
α
...-activities have been used to study the population of nuclei with lifetimes ranging from few milliseconds to several days. We observed several, relatively neutron-rich isotopes with atomic numbers
Z
≥
98
; among them a weak 224 millisecond activity which we tentatively attributed to
260
No. The measured cross-sections of the observed nuclei give hope that multi-nucleon transfer reactions are a way to reach new neutron-rich heavy and superheavy nuclei, which are not accessible in other reactions. We compare our results with data from earlier experiments and discuss limitations and future perspectives of the method.
After more than 45 years of successful operation of the GSI velocity filter SHIP in heavy and superheavy element research, it is time for the development of a next-generation in-flight separator. In ...frame of our Manipal-GSI-Giessen collaboration we designed a velocity filter which is intended for (super)heavy fusion and multinucleon transfer products. In this article we will present the design of the new in-flight separator and related detection techniques, as well as further activities of our collaboration.
We present a Fortran program for the calculation of the ground state properties of axially deformed even-even nuclei in the framework of Relativistic Mean Field Theory (RMF). In this approach a set ...of coupled partial differentials has to be solved self-consistently: the Dirac equation for the nucleons moving in self-consistent fields and the Klein-Gordon equations for the meson fields and the electromagnetic field, whose sources are scalar and vector densities determined of the nucleons. For this purpose the Dirac spinors as well as the meson fields are expanded in terms of anisotropic oscillator wave functions in cylindrical coordinates. This requires a matrix diagonalization for the solution of the Dirac equations and the solution of an inhomogeneous matrix equation for the meson fields. For the determination of the Coulomb field the Greens function method is used.
The results of extensive microscopic relativistic mean field (RMF) calculations for the nuclei appearing in the
α-decay chains of recently discovered superheavy elements with 109
⩽
Z
⩽
118 are ...presented and discussed. The calculated ground-state properties like total binding energies,
Q-values, deformations, radii, and densities closely agree with the corresponding experimental data, where available. The root mean square radii closely follow
A
1/3 law (
A being the mass number) with the constant
r
o
=
0.9639
±
0.0005
fm. The double folding (
tρρ) approximation is used to calculate the interaction potential between the daughter and the
α, using RMF densities along with the density-dependent nucleon–nucleon interaction (M3Y). This in turn is employed within the WKB approximation to estimate the half-lives without any additional parameter for
α-decay. The half-lives are highly sensitive to the
Q-values used and qualitatively agree with the corresponding experimental values. The use of experimental
Q-values in the WKB approximation improves the agreement with the experiment, indicating that the resulting interaction potential is reliable and can be used with confidence as the real part of the optical potential in other scattering and reaction processes.
PDF
