منابع مشابه
Full pf shell model study of A=48 nuclei.
Exact diagonalizations with a minimally modified realistic force lead to detailed agreement with measured level schemes and electromagnetic transitions in 48 Ca, 48 Sc, 48 Ti, 48 V, 48 Cr and 48 Mn. Gamow-Teller strength functions are systematically calculated and reproduce the data to within the standard quenching factor. Their fine structure indicates that fragmentation makes much strength un...
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We have investigated the N-type carbon star U Ant in high resolution IRAS images. We find that the star shows two extended dust shell components and that these two shells are also clearly present in the original survey scan data. We have fitted a double dust shell model with spherical symmetry to the data to obtain the physical quantities of the shells. The inner dust shell component is related...
متن کاملEnvironmental Dependencies for Star Formation Triggered by Expanding Shell Collapse
Criteria for gravitational collapse of expanding shells in rotating, shearing galaxy disks were determined using three-dimensional numerical simulations in the thin shell approximation. The simulations were run over a grid of 7 independent variables, and the resultant probabilities for triggering and unstable masses were determined as functions of 8 dimensionless parameters. When the ratio of t...
متن کاملTriggered Star Formation in a Double Shell near W51a
We present Heinrich Hertz Telescope CO observations of the shell structure near the active starforming complex W51A to investigate the process of star formation triggered by the expansion of an H II region. The CO observations confirm that dense molecular material has been collected along the shell detected in Spitzer IRAC images. The CO distribution shows that the shell is blown out toward a l...
متن کاملLarge-Scale Shell-Model Analysis of the Neutrinoless ββ Decay of ^{48}Ca.
We present the nuclear matrix element for the neutrinoless double-beta decay of ^{48}Ca based on large-scale shell-model calculations including two harmonic oscillator shells (sd and pf shells). The excitation spectra of ^{48}Ca and ^{48}Ti, and the two-neutrino double-beta decay of ^{48}Ca are reproduced in good agreement to the experimental data. We find that the neutrinoless double-beta deca...
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ژورنال
عنوان ژورنال: The Astronomical Journal
سال: 1953
ISSN: 0004-6256
DOI: 10.1086/106874