296 research outputs found
Collective Path Connecting the Oblate and Prolate Local Minima in 68Se
By means of the adiabatic self-consistent collective coordinate method and
the pairing plus quadrupole interaction, we have obtained the selfconsistent
collective path connecting the oblate and prolate local minima in 68Se for the
first time. Along the collective path, the triaxial deformation parameter
(gamma) changes between 0 and 60 (degree) keeping the axially symmetric
deformation parameter (beta) approximately constant, indicating the importance
of triaxial deformation dynamics in the oblate-prolate shape coexistence
phenomena.Comment: 6 pages including 6 eps figure
Microscopic Derivation of Collective Hamiltonian by Means of the Adiabatic Self-Consistent Collective Coordinate Method
Microscopic dynamics of the oblate-prolate shape coexistence/mixing phenomena
in 68Se and 72Kr are studied by means of the adiabatic self-consistent
collective coordinate (ASCC) method in conjunction with the
pairing-plus-quadrupole (P+Q) Hamiltonian including the quadrupole pairing
interaction. Quantum collective Hamiltonian is constructed, and excitation
spectra, spectroscopic quadrupole moments and quadrupole transition properties
are evaluated. The effect of the time-odd pair field on the collective mass
(inertia function) of the large-amplitude vibration and the rotational moments
of inertia about three principal axes is evaluated. Basic properties of the
shape coexistence/mixing are well reproduced. The calculation indicates that
the oblate-prolate shape mixing decreases as the angular momentum increases.Comment: 39 pages, 14 figure
Identification of Myocardial Damage in Systemic Sclerosis: A Nuclear Cardiology Approach
Myocardial involvement is an important prognostic factor in patients with systemic sclerosis, and early diagnosis and staging of the disease have been sought after. Since myocardial damage is characterized by connective tissue disease, including fibrosis and diffuse vascular lesions or microcirculation, nuclear myocardial perfusion imaging has been a promising option for evaluating myocardial damages in early stages. In addition to the conventional stress-rest perfusion imaging, the current use of quantitative electrocardiographic gated imaging has contributed to more precise evaluation of cardiac perfusion, ventricular wall motion, and diastolic function, all of which have enhanced diagnostic ability of evaluating myocardial dysfunction. Abnormal sympathetic imaging with Iodine-123 metaiodobenzylguanidine might be another option for identifying myocardial damage. This paper deals with approaches from nuclear cardiology to detect perfusion and functional abnormality as an early sign of myocardial involvement as well as possible prognostic values in patients with abnormal imaging results. The role of nuclear cardiology in the era of multiple imaging modalities is discussed
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