134 research outputs found
Charged particle decay of hot and rotating Mo nuclei in fusion-evaporation reactions
A study of fusion-evaporation and (partly) fusion-fission channels for the
Mo compound nucleus, produced at different excitation energies in the
reaction Ti + Ca at 300, 450 and 600 MeV beam energies, is
presented. Fusion-evaporation and fusion-fission cross sections have been
extracted and compared with the existing systematics. Experimental data
concerning light charged particles have been compared with the prediction of
the statistical model in its implementation in the Gemini++ code, well suited
even for high spin systems, in order to tune the main model parameters in a
mass region not abundantly covered by exclusive experimental data.
Multiplicities for light charged particles emitted in fusion evaporation events
are also presented. Some discrepancies with respect to the prediction of the
statistical model have been found for forward emitted -particles; they
may be due both to pre-equilibrium emission and to reaction channels (such as
Deep Inelastic Collisions, QuasiFission/QuasiFusion) different from the
compound nucleus formation.Comment: 14 pages, 14 figure
Core-coupled states and split proton-neutron quasi-particle multiplets in 122-126Ag
Neutron-rich silver isotopes were populated in the fragmentation of a 136Xe
beam and the relativistic fission of 238U. The fragments were mass analyzed
with the GSI Fragment separator and subsequently implanted into a passive
stopper. Isomeric transitions were detected by 105 HPGe detectors. Eight
isomeric states were observed in 122-126Ag nuclei. The level schemes of
122,123,125Ag were revised and extended with isomeric transitions being
observed for the first time. The excited states in the odd-mass silver isotopes
are interpreted as core-coupled states. The isomeric states in the even-mass
silver isotopes are discussed in the framework of the proton-neutron split
multiplets. The results of shell-model calculations, performed for the most
neutron-rich silver nuclei are compared to the experimental data
Single-particle isomeric states in 121Pd and 117Ru
Neutron-rich nuclei were populated in a relativistic fission of 238U. Gamma-rays with energies of 135 keV and 184 keV were associated with two isomeric states in 121Pd and 117Ru. Half-lives of 0.63(5) microseconds and 2.0(3) micrisecondss were deduced and the isomeric states were interpreted in terms of deformed single-particle states
Single-particle isomeric states in 121Pd and 117Ru
Neutron-rich nuclei were populated in a relativistic fission of 238U.
Gamma-rays with energies of 135 keV and 184 keV were associated with two
isomeric states in 121Pd and 117Ru. Half-lives of 0.63(5) microseconds and
2.0(3) micrisecondss were deduced and the isomeric states were interpreted in
terms of deformed single-particle states
Single-particle isomeric states in 121Pd and 117Ru
Neutron-rich nuclei were populated in a relativistic fission of 238U.
Gamma-rays with energies of 135 keV and 184 keV were associated with two
isomeric states in 121Pd and 117Ru. Half-lives of 0.63(5) microseconds and
2.0(3) micrisecondss were deduced and the isomeric states were interpreted in
terms of deformed single-particle states
Single-particle isomeric states in 121Pd and 117Ru
Neutron-rich nuclei were populated in a relativistic fission of 238U.
Gamma-rays with energies of 135 keV and 184 keV were associated with two
isomeric states in 121Pd and 117Ru. Half-lives of 0.63(5) microseconds and
2.0(3) micrisecondss were deduced and the isomeric states were interpreted in
terms of deformed single-particle states
Isospin mixing at finite temperature in 80Zr
The degree of isospin mixing in the hot compound nucleus 80Zr has been extracted by statistical-model analysis of the γ-decay spectrum emitted in fusion reactions 40Ca+40Ca at Ebeam = 200 MeV and 37Cl+44Ca at Ebeam = 153 MeV. In the case of 40Ca+40Ca reaction an hindrance of first-step γ-decay is expected because in self-conjugate nuclei the E1 selection rules forbid the decay between states with isospin I=0. The results obtained at finite temperature (T ~ 2 MeV) have been used to extrapolate the degree of mixing at zero temperatur
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