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ABSTRACT: The angular dependence of the differential cross sections for alpha-particle scattering on 28Si nuclei and double-differential cross sections for the reaction 28Si(α, αγ)28Si at E
α
= 30.3 MeV is measured for the case of alpha-particle emission angle between 20° and 160° and the excitation of low-lying
states of the 28Si nucleus (0+, ground state; 2+ state at 1.78 MeV; 4+ state at 4.62 MeV; 0+ state at 4.96 MeV; and 3− + 4+, 6.88 MeV + 6.89 MeV). The spin-tensor components of the density matrix for the 2+ state at 1.78 MeV and the 4+ state at 4.62 MeV in the 28Si* nucleus are reconstructed in a modelindependent way. Seven rank-6 components are reconstructed for the 3− state at 6.88 MeV. Orientation features of 28Si* are determined. The experimental data in question are compared with the results of the calculations performed under the
assumption of the collective-excitation mechanism and by the coupled-channel method.
Physics of Atomic Nuclei 05/2012; 73(8):1339-1350. · 0.57 Impact Factor
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ABSTRACT: The results from measuring the angular dependence of differential α-scattering cross sections on 24Mg with final nucleus formation in the ground and three lower excited states are presented, along with the double differential
24Mg(α, αγ)24Mg(2+, 1.369 MeV) reaction cross sections at E
α = 30.3 MeV. The spin-tensor components of the density matrix of the 24Mg nucleus in the 2+(1.369 MeV) state are reconstructed and its orientation characteristics are determined. The experimental results are compared
to theoretical results under the assumption of collective excitation and mechanisms for compound nucleus formation.
Bulletin of the Russian Academy of Sciences Physics 04/2012; 75(4):552-557.
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ABSTRACT: The results are presented that were obtained by measuring the differential cross sections for the reaction 12C(d,d) 12C occurring at E
d = 15.3 MeV and leading to the production of a 12C nucleus in the ground and the first excited state. The energy dependences of the differential reaction cross sections were
measured for three angles of deuteron emission in the range of projectile-deuteron energies E
d between 12 and 15.3 MeV. The double-differential cross sections for the reaction in question were measured for the 2+ state of the 12C nucleus at 4.44 MeV, and the angular dependences of the even spin-tensor components of the density matrix were determined,
along with the angular dependences of the populations of magnetic sublevels and the components of the tensors of multipole-moment
orientation. These experimental results are compared with their theoretical counterparts obtained under the assumption of
various reaction mechanisms, including collective interaction, heavy-particle stripping, a two-step mechanism that takes into
account the delay in the interaction, and the mechanism of compound-nucleus formation.
Physics of Atomic Nuclei 01/2007; 70(2):273-282. · 0.57 Impact Factor
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ABSTRACT: The results are presented that were obtained by measuring the differential cross sections for the reaction 10B(d, p)11B occurring at E
d
= 15.3 MeV and leading to the production of a 11B nucleus in the ground state (3/2−) and in the lowest two excited states (the 1/2− state at 2.125 MeV and the 5/2− state at 4.445 MeV). The energy dependence of the differential cross section for this reaction was measured for several proton
emission angles in the energy range E
d
= 12–15.3 MeV. The double-differential cross sections for the reaction 10B(d, pγ)11B were measured for the 5/2− state of the 11B nucleus at 4.445 MeV, and the angular dependences of the even spin-tensor components of the density matrix were reconstructed
on the basis of these data. The angular dependences of the populations of magnetic sublevels are also given. The experimental
results in question are compared with their theoretical counterparts obtained under the assumption of various reaction mechanisms
(neutron stripping, heavy-particle stripping, and a two-step mechanism that takes into account the delay of interaction).
On the basis of this comparison, the deformation parameters of the boron nuclei were found to be β
2(10B) = −0.55 and β
2(11B) = 0.4.
Physics of Atomic Nuclei 11/2005; 68(12):1957-1967. · 0.57 Impact Factor
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ABSTRACT: Double-differential cross sections for the reaction 9Be(d, pγ)10Be at E
d=15.3 MeV are measured for proton emission into the forward hemisphere. All even spin-tensor components of the density matrix
for the 2+ 3.37-MeV state of the residual nucleus are reconstructed in a model-independent way. The angular distributions of the populations
of the magnetic substates and of the tensors of the angular-momentum orientation for the state in question are also obtained.
The experimental results are compared with the results of the calculations performed by the coupled-channel method under the
assumption of the neutron-stripping mechanism. The calculated correlation features are found to be highly sensitive to the
wave functions for the participant nuclei, especially the 10Be nucleus. The importance of taking into account multistep processes in the reaction being considered is demonstrated.
Physics of Atomic Nuclei 10/2001; 64(11):1909-1916. · 0.57 Impact Factor
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ABSTRACT: The double-differential cross sections for the reaction 15N(p, αγ)12C induced by 7.5-MeV protons are measured for alpha-particle emission angles from 20° to 160°. All even spin-tensor components
of the density matrix for the 2+ state (4.44 MeV) of the final nucleus are reconstructed by a model-independent method. For the same state of the carbon nucleus,
the populations of magnetic sublevels and the components of the angular-momentum-orientation tensor are analyzed as functions
of the alpha-particle emission angle. Our experimental data are compared with theoretical predictions based on the triton-cluster-pickup
mechanism treated within the coupled-channel method. It is shown that correlation features are sensitive to the reaction mechanism
and to structural characteristics of the nuclei involved. The role of sequential processes is emphasized.
Physics of Atomic Nuclei 08/2000; 63(9):1489-1496. · 0.57 Impact Factor
