Clinical and psychopathological characteristics and social functioning of patients with hallucinatory-paranoid disorders in moderate vascular dementia.

The relevance of the study is determined by a high prevalence of dementia, significant economic costs of treatment, negative consequences in the form of disability and decrease in the quality of social functioning. The aim of the research was to study the clinical and psychopathological characteristics and specificity of the social functioning of patients with hallucinatory-paranoid disorders (НРD) in moderate vascular dementia (MVD). To achieve this goal, a comprehensive methodological approach was used, which was implemented using the clinical and psychopathological method, supplemented by the use of psychometric scales (neuropsychiatric inventory (NPI), global assessment functioning scale (GAF), disability assessment scale (WHO / DAS), Bristol daily activity scale (BADL)) and methods of mathematical data processing. In a study of clinical-psychopathological characteristics and social functioning of patients with HPD in MVD 75 patients took part. 41 patients with HPD (main group) and 34 patients without psychotic disorders (control group) were examined. In the structure of clinical-psychopathological mani­festations in patients with HPD in MVD the following symptoms were revealed: the prevalence of frequent delusional ideas of material damage, robbery and jealousy - in a moderate degree; a combination of HPD with frequent vagrancy; periodic moderate verbal aggression; frequent rhythm disturbances day / night, frequent low mood, manifested in the form of dysphoria; fear of being alone; frequent states of irritability. The expressed negative influence of HPD on communication function, quality and level of participation in fulfilling the parental role, the need and effectiveness of social contacts, the effectiveness of behavior in non-standard and difficult conditions was established. The influence of HPD on the formation of limitations of their vital functions in communication, ability to use the phone, make purchases, manage finances and use transport in patients of this group was defined. It was proved that the range of social functioning of patients corresponded to disorders ranging from a serious deterioration in functioning in the social and professional spheres - to the inability of functioning in certain areas of life

Exclusive Measurement of the Nonmesonic Weak Decay of ^{5}_{\Lambda}He Hypernucleus

We performed a coincidence measurement of two nucleons emitted from the nonmesonic weak decay (NMWD) of ^{5}_{\Lambda}He formed via the ^{6}Li(\pi^+,K^+) reaction. The energies of two nucleons and the pair number distributions in the opening angle between them were measured. In both np and nn pairs, we observed a clean back-to-back correlation coming from the two-body decay of \Lambda p --> n p and \Lambda n --> n n, respectively. The ratio of the nucleon pair numbers was N_{nn}/N_{np}=0.45 \pm 0.11(stat)\pm 0.03(syst) in the kinematic region of cos(theta_{NN}) < -0.8. Since each decay mode was exclusively detected, the measured ratio should be close to the ratio of \Gamma(\Lambda p --> np)/\Gamma(\Lambda n --> nn). The ratio is consistent with recent theoretical calculations based on the heavy meson/direct quark exchange picture.Comment: Submitted to Phys. Rev. lett., 4 pages, 3 figure

Measurement of the π−\pi^- decay width of Λ5^5_\LambdaHe

We have precisely measured $\Lambda \to p\pi^-$ decay width of \5LHe and demonstrated significantly larger $\alpha$ -$\Lambda$ overlap than expected from the central repulsion $\alpha$-$\Lambda$ potential, which is derived from YNG \Lambda$-nucleon interaction.Comment: 4 pages, 3 figure

Proton asymmetry in non-mesonic weak decay of light hypernuclei

We have obtained the decay asymmetry parameters in non-mesonic weak decay of polarized Lambda-hypernuclei by measuring the proton asymmetry. The polarized Lambda-hypernuclei, 5_Lambda-He, 12_Lambda-C, and 11_Lambda-B, were produced in high statistics via the (pi^+,k^+) reaction at 1.05 GeV/c in the forward angles. Preliminary analysis shows that the decay asymmetry parameters are very small for these s-shell and p-shell hypernuclei.Comment: 4pages, 4figures, International Conference on Hypernuclear and Strange Particle Physics (HYP2003

pi^0 decay branching ratios of 5_Lambda-He and 12_Lambda-C hypernuclei

We precisely measured pi^0 branching ratios of 5_Lambda-He and 12_Lambda-C hypernuclei produced via (pi^+,k^+) reaction. Using these pi^0 branching ratios with the pi^- branching ratios and the lifetimes, we obtained the pi^0 decay widths and the non-mesonic weak decay widths at high statistics with the accuracy of ~5 % (stat) for both hypernuclei.Comment: 4pages, 4figures, International Conference on Hypernuclear and Strange Particle Physics (HYP2003