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[en] The results of the direct mass measurements of the unstable isotopes of Rb, Cs and Fr are rewritten in a form-linear combination of masses-which allows a direct analysis with other experimental data. An up-to-date least-square adjustment which takes into account new reference masses is subsequently performed. A systematic study of isomers is carried out for evaluating isomeric corrections to apply to the measured masses in order to obtain the ground-state masses. (orig.)
[en] This paper is the first of a series of four. In it, a table is given to replace the 1983 atomic mass table. The differences with the earlier table are briefly discussed and information is given of interest for the users of this table. Part II of this series gives values for several derived quantities (decay-, separation- and reaction energies), part III shows graphs of several of those quantities, and part IV gives a list of input data and full information on the used input data and on the procedures used in deriving the tables in the preceding parts. (orig.)
[en] Tables of the one-body coefficients of fractional parentage are presented for the unitary group chain U(mn)containsU(m)xU(n) and the graded unitary group chain U(mp+nq(mq+np))containsU(m+n)XU(p/q) with arbitrary m, n, p and q for systems having up to six particles. These coefficients are computed by using a program based on the fact that they are the isoscalar factors for the permutation group chain S(f)containsS(f-1), and thus are m and n (or m, n, p and q) independent. The S(f)containsS(f-1) isoscalar factors are calculated by the eigenfunction method. Incidently, the program also provides an efficient way for constructing the Clebsch-Gordan coefficients of the permutation group. (orig.)
[en] This paper is the first of a series of four. In it, a table is given to replace the 1977 atomic mass table. The differences from the earlier tables are briefly discussed and information is given of interest for users of this table. Part II of this series gives values for several derived quantities (decay, separation and reaction energies), part III shows graphs of several of them, and part IV gives full information on the procedures used in deriving these evaluated data. (orig.)
[en] We make an extensive study of the fragmentation pattern for various asymmetric reactions using isospin-dependent quantum molecular dynamics model and confront our theoretical calculations with the available experimental data. A comparison with various other models is also presented. Our detailed analysis reveals that isospin-dependent quantum molecular dynamics model calculations nicely reproduce the measurements of asymmetric reactions around Fermi energies, whereas deviation can be seen at extreme lower as well as at higher incident energies.
[en] In this study, Bohr Hamiltonian is studied for the triaxial and rotational cases. In both cases, Killingbeck potential is used as interaction. The wave function and energy of these cases are found using bi-confluent Heun functions. The results are examined by reproducing experimental data of some isotopes for each case. Energy levels of the isotopes are shown graphically as well as theoretical results for staggering in γ bands of the isotopes is discussed. In the next step, we argue about B transition rates of the isotopes for each case. The results have a good agreement with experimental data.
[en] A completely microscopic approach based on the full Hartree-Fock-Bogolyubov procedure and the gaussian overlap approsimation of the generator coordinate method is applied to the 12C + 12C reaction at low energy. No accurate reproduction of the experimental results is looked for. The aim of this work is rather to obtain the general behaviour of the quantities of interest by using an approach as free as possible from phenomenological hypotheses. (orig.)
[en] We briefly review the status of the current models of the initial state of the relativistic heavy ion collisions. Possible ways to extract information on the initial states from the experimental data are illustrated
[en] A semiclassical theory of heavy-ion transfer reactions developed in our previous paper is applied to the analysis of the energy spectra, angular distributions and polarizations of outgoing particles. We treat reactions involving transfers of one, two and seven nucleons, and one and two α-particles. A one- or two-step process is assumed. A straight-line trajectory of relative motion is used in most cases. But better agreement for the polarizations can be obtained if we assume that the incident ion rolls around the target nucleus for a short time interval. (orig.)
[en] Nuclear-charge yields of fragments produced by fission of 214,...,223Ac, 220,...,229Th, 224,...,232Pa, and 231,...,234U have been measured. These radioactive nuclei were produced as secondary beams, and fission was induced in flight at 420 A MeV by electromagnetic excitation in a lead target. The excitation-energy distribution at fission is estimated to be centered at 11 MeV. The nuclear-charge distributions of the fission fragments of odd-Z actinium and protactinium isotopes show a pronounced odd-even structure: in asymmetric charge splits, the unpaired proton predominantly sticks to the heavy fragment. A model is proposed which attributes this effect to the single-particle level densities of the nascent fission fragments. This model also explains the strongly enhanced odd-even effect observed in the most asymmetric parts of the nuclear-charge distributions after fission of the even-Z nuclei 220,...,229Th and 231,...,234U. It is concluded that proton pairs are broken in an early stage of the fission process. (orig.)