Screening for social anxiety disorder with the self-report version of the Liebowitz Social Anxiety Scale

Item does not contain fulltextObjective: This study examined whether the self-report version of the Liebowitz Social Anxiety Scale (LSAS-SR) could accurately identify individuals with social anxiety disorder and individuals with the generalized subtype of social anxiety disorder. Furthermore, the study sought to determine the optimal cutoffs for the LSAS-SR for identifying patients with social anxiety disorder and its generalized subtype. Methods: Two hundred and ninety-one patients with clinician-assessed social anxiety disorder (240 with generalized social anxiety disorder) and 53 control participants who were free from current Axis-1 disorders completed the LSAS-SR. Results: Receiver Operating Characteristic analyses revealed that the LSAS-SR performed well in identifying participants with social anxiety disorder and generalized social anxiety disorder. Consistent with Mennin et al.'s [2002: 1 Anxiety Disord 16:661-673] research on the clinician-administered version of the LSAS, cutoffs of 30 and 60 on the LSAS-SR provided the best balance of sensitivity and specificity for classifying participants with social anxiety and generalized social anxiety disorder; respectively. Conclusions: The LSAS-SR may be an accurate and cost-effective way to identify and subtype patients with social anxiety disorder, which could help increase the percentage of people who receive appropriate treatment for this debilitating disorder

Mirror symmetry at mass A = 54: E4 effective charges near doubly magic 56^{56}Ni

International audienceProton-emission branches of the 10+ isomer in the Tz=−1 nucleus 54Ni have been imaged with the active target and time projection chamber (ACTAR TPC) in an experiment conducted at the Grand Accélérateur National d'Ions Lourds (GANIL). The completed decay scheme allows derivation of the reduced transition strengths, B(E2;10+→8+) and B(E4;10+→6+), for the two competing γ-ray transitions. By means of a comparison with their well-known ‘mirror transitions’ in Tz=+154Fe, and aided by a variety of shell-model calculations in the fp model space, effective charges for E4 transitions near N=Z56Ni can be deduced: επ≈1.40 and εν≈0.30. Mirror-energy differences are explored with various shell-model interactions and isospin-symmetry breaking terms

4D-imaging of drip-line radioactivity by detecting proton emission from 54m^{54m}Ni pictured with ACTAR TPC

Proton radioactivity was discovered exactly 50 years ago. First, this nuclear decay mode sets the limit of existence on the nuclear landscape on the neutron-deficient side. Second, it comprises fundamental aspects of both quantum tunnelling as well as the coupling of (quasi) bound quantum states with the continuum in mesoscopic systems such as the atomic nucleus. Theoretical approaches can start either from bound-state nuclear shell-model theory or from resonance scattering. Thus, proton-radioactivity guides merging these types of theoretical approaches, which is of broader relevance for any few-body quantum system. Here, we report experimental measurements of proton-emission branches from an isomeric state in 54mNi, which were visualized in four dimensions in a newly developed detector. We show that these decays, which carry an unusually high angular momentum, ℓ = 5 and ℓ = 7, respectively, can be approximated theoretically with a potential model for the proton barrier penetration and a shell-model calculation for the overlap of the initial and final wave functions

Proton 3D tracking and emission time from a short-lived isomer with ACTAR TPC

International audienceAn experiment was conducted at the GANIL/LISE3 facility to produce the 10+ isomer of 54Ni and measure its proton radioactivity decay branches. The proton detection was achieved with the ACTAR TPC device that enabled the separation of the small signal of the emitted proton from the large signal of the implanted ion, while the decay half-life is of the order of 150 ns. From the measured data, the emitted proton track length and the decay time of the ion can be extracted simultaneously. The full proton radioactivity pattern could be established, with two emission branches and their relative branching ratio. Data processing and analysis that allowed to identify and separate the ion and the proton signals in order to reconstruct the particles trajectories and decay time are detailed. The evaluation of the detection efficiency for the proton radioactivity branches based on a full simulation is described