Proton-neutron symmetry in 92Zr, 94Mo with Skyrme interactions in a separable approximation

Starting from a Skyrme interaction we study the properties of the low-energy spectrum of quadrupole excitations in 90,92Zr, 92,94Mo. The coupling between one- and two-phonon terms in the wave functions of excited states are taken into account. We use the finite-rank separable approximation which enables one to perform the QRPA calculations in very large two-quasiparticle spaces. Our results from the SGII Skyrme interaction in connection with the volume pairing interaction are in reasonable agreement with experimental data. In particular, we present the successful description of the M1 transition between low-energy quadrupole excitations.Comment: 9 pages, 3 figure

Spreading widths of giant resonances in spherical nuclei: damped transient response

We propose the universal approach to describe spreading widths of monopole, dipole and quadrupole giant resonances in heavy and superheavy spherical nuclei. Our approach is based on the ideas of the random matrix distribution of the coupling between one-phonon and two-phonon states generated in the random phase approximation. We use the Skyrme interaction SLy4 as our model Hamiltonian to create a single-particle spectrum and to analyze excited states of the doubly magic nuclei $^{132}$Sn, $^{208}$Pb and $^{310}$126. Our results demonstrate that the universal approach enables to describe gross structure of the spreading widths of the considered giant resonances.Comment: 6 pages, 2 figure

Microscopic Description of Isoscalar Giant Monopole Resonance in 48^{48}Ca

The properties of the isoscalar giant monopole resonance (ISGMR) for the double magic $^{48}$Ca are analyzed in the framework of a microscopic model based on Skyrme-type interactions. A method for simultaneously taking into account the coupling between one-, two-, and three-phonon terms in the wave functions of $0^{+}$ states has been developed. The inclusion of three-phonon configurations leads to a substantial redistribution of the ISGMR strength to lower energy $0^{+}$ states and also higher energy tail. Our results demonstrate that the developed approach enables to us to describe a gross structure of the ISGMR spreading width.Comment: 13 pages, 1 figure, accepted for publication in Physics of Atomic Nucle

Two-phonon structures for beta-decay theory

The $\beta$-decay rates of $^{60}$Ca have been studied within a microscopic model, which is based on the Skyrme interaction T45 to construct single-particle and phonon spaces. We observe a redistribution of the Gamow-Teller strength due to the phonon-phonon coupling, considered in the model. For $^{60}$Sc, the spin-parity of the ground state is found to be $1^+$. We predict that the half-life of $^{60}$Ca is 0.3 ms, while the total probability of the $\beta x n$ emission is 6.1%. Additionally, the random matrix theory has been applied to analyse the statistical properties of the $1^+$ spectrum populated in the $\beta$-decay to elucidate the obtained results.Comment: 4 pages, 1 figure, proceedings of International Conference on Nuclear Structure and Related Topics (NSRT18), June 3-9 2018, Burgas, Bulgari

Influence of complex configurations on properties of pygmy dipole resonance in neutron-rich Ca isotopes

Starting from the quasiparticle random phase approximation based on the Skyrme interaction SLy5, we study the effects of phonon-phonon coupling~(PPC) on the low-energy electric dipole response in $^{40-58}$Ca. Using the same set of parameters we describe available experimental data for $^{40,44,48}$Ca and give prediction for $^{50-58}$Ca. The inclusion of the PPC results in the formation of low-energy $1^-$ states. There is an impact of the PPC effect on low-energy $E1$~strength of $^{40,44,48}$Ca. The PPC effect on the electric dipole polarizability is discussed. We predict a strong increase of the summed $E1$~strength below 10MeV, with increasing neutron number from $^{48}$Ca till $^{58}$Ca.Comment: 11 pages, 10 figure

Structure of low-lying quadrupole states in nuclei near 132Sn

The properties of the low-lying 2^+ states in the even-even nuclei around 132Sn are studied within the quasiparticle random phase approximation. Starting from a Skyrme interaction in the particle-hole channel and a density-dependent zero-range interaction in the particle-particle channel, we use the finite rank separable approach in our investigation. It is found that the fourth 2^+ state in 132Te could be a good candidate for a mixed-symmetry state.Comment: 6 pages, 2 figures, proceedings of International Conference on Nuclear Structure and Related Topics (NSRT09), June 2009, JINR, Dubna, Russi

Spreading widths of giant monopole resonance in the lead region: Random matrix approach

The microscopic calculation of the decay width of giant monopole resonance (GMR) anticipates the mixing of one-phonon states with configurations of increasing complexity. To this aim we develop the effective approach for description of monopole excited states that are obtained in the quasiparticle random phase approximation (QRPA), with regard of the coupling between one- and two-phonon states. Based on the QRPA one-phonon states, we generate the coupling and two-phonon states by means of the Gaussian orthogonal ensemble (GOE) distribution. Within our approach the spreading width of the GMRs in $^{204,206,208}$Pb are described by means of a random matrix approach on two energy scales. It is demonstrated that the main contribution into the decay of the GMR is determined by a small number of two-phonon states strongly coupled to low-energy surface vibrations. While a vast majority of the coupling matrix elements (that are small in value and following the GOE distribution) are responsible for the fine structure of the GMR spreading width. A remarkable agreement between the results of the full microscopic calculations (based on QRPA phonons coupled by means of the microscopic coupling matrix elements with calculated two-phonon states) with those of the developed approach confirms the vitality of the proposed ideas.Comment: 8 pages, 7 figure

Influence of 2p-2h configurations on beta-decay rates

The effects of the phonon-phonon coupling on the beta-decay rates of neutron-rich nuclei are studied in a microscopic model based on Skyrme-type interactions. The approach uses a finite-rank separable approximation of the Skyrme-type particle-hole (p-h) residual interaction. Very large two-quasiparticle spaces can thus be treated. A redistribution of the Gamow-Teller (G-T) strength is found due to the tensor correlations and the 2p-2h fragmentation of G-T states. As a result, the beta-decay half-lives are decreased significantly. Using the Skyrme interaction SGII together with a volume-type pairing interaction we illustrate this reduction effect by comparing with available experimental data for the Ni isotopes and neutron-rich N=50 isotones. We give predictions for 76Fe and 80Ni in comparison with the case of the doubly-magic nucleus 78Ni which is an important waiting point in the r-process.Comment: 8 pages, 6 figures, accepted for publication in Physical Review

Assessment of adherence to drug and non-drug treatments and its changes under the influence of an education program in patients with rheumatoid arthritis

Objective: to assess awareness of drug and non-drug treatments for rheumatoid arthritis (RA) and compliance in patients before and after their participation in an education program, as well as the survival of the knowledge and the need for retraining. Subjects and methods. The study included 43 patients with RA: 23 study group patients were trained according to an education program (Rheumatoid Arthritis Health School), 20 patients formed a control group. The education program consisted of 4 daily 90-min studies. Adherence to drug and non-drug treatments was assessed at baseline and at 3 and 6 months. Results. In the study group, the basic therapy remained stably high (about 100%) within 6 months. At 3 months after studies, nonsteroidal anti-inflammatory drugs could be discontinued in 23.8% (p < 0.05). After 6 months, the proportion of patients using laser therapy increased by 57.1% (p < 0.01) and accounted for 47.8%; the use of electric and ultrasound treatments showed a 55.6% increase (p < 0.01) and was 60.9%. The number of patients who were compliant to the procedures for shaping a correct functional stereotype increased by 14 and 10 times following 3 and 6 months (60.9% and 43.5%, respectively; p < 0.01). After 3 months, there was a rise in the number of patients using hand ortheses by 75.0% (30.4%; p < 0.01); knee ortheses by 50.0% (39.1%; p < 0.01); individual inner soles by 71.4% (52.2%; p < 0.01); and walking sticks and crutches by 60.0% (34.8%; p < 0.01). Following 6 months, the positive changes remained only after the relative use of inner soles (60.9%) and support means (34.8%; p < 0.05). The number of patients who regularly did physical activity increased by 5.3 (69.6%; р < 0.01) and 3.7 (47.8%; p < 0.01) times at 3 and 6 months, respectively. The trend in the control group was less pronounced, determining statistically significant differences between the groups in most indicators (р < 0.05). Conclusion. The education program retains high compliance to the basic therapy, reduces needs for symptomatic drugs, and enhances adherence to physiotherapy, methods for shaping a correct motor stereotype, orthesis wearing, and regular physical activity. The maximum positive result of the Rheumatoid Arthritis Health School was achieved after 3 months; this effect slightly diminished at 6 months. This necessitates retraining in the following 3-6 months

Clinical efficiency of an education program for patients with rheumatoid arthritis

Objective: to develop an education program for patients with rheumatoid arthritis (RA) and to evaluate its efficiency. Subjects and methods. The study included 43 patients with RA: 23 study group patients were trained according to an education program (Rheumatoid Arthritis Health School), 20 patients formed a control group. The education program consisted of 4 daily 90-min studies. The MDHAQ (R798—NP2) questionnaire was used to determine DAS 28, HAQ, RAPID 3 scores at baseline and following 6 months. Results. Six months after education, the study group showed reductions in DAS 28 by 1.33+0.26 scores (р < 0.05), HAQ by 0.91±0.54 (55.2%; р < 0.01), and RAPID 3 by 5.96±0.92 (49.9%; р < 0.01), anxiety level by 0.86±0.32 (54.4%; р < 0.05), depression by 0.87±0.61 (53.4%; р < 0.05), fatigability by 3.39±1.17 (47.5%; р < 0.05); sleep improved by 0.81±0.36 scores (54.7%; р < 0.05). Six months following education program participation, there was significantly more frequently a good DAS 28 response to treatment according to the EULAR criteria (52.2% versus 30.0% in the control group; р < 0.05), and the number of patients who reported health improvement increased by 8.5 times (р < 0.01). The changes in the control group were less pronounced, which determined statistically significant differences between the groups in most indicators (р < 0.05). Conclusion. The education program improves functional capacities and psychological status, assists in controlling the disease activity, and enhances the quality of life in patients with RA