The y rays following the P decays of 'Kr, 'Rb, and 'Sr have been studied, using Ge(Li) detectors for singles and coincidence measurements. A level scheme for "Y is reported which contains 36 excited levels and 143 of the 162 observed y rays in the decay of "Sr. For the decay of "Rb, 243 y rays were observed, with 231 placed in a level scheme for "Sr consisting of 74 excited levels. The decay of 'Kr was observed to have 217 y rays, 203 of which are placed in a level scheme for Rb comprising 56 excited levels. Over 98% of the observed yray intensity is contained in each of the level schemes. Spin and parity assignments are proposed, whenever possible, on the basis of y-ray transition probabilities and deduced logft values. A comparison is made with available reaction data for the Y level scheme, and some of the levels in each decay scheme are interpreted in terms of the nuclear shell model.
RADIOACTIVITYKr, Rb, Sr [from U(n, f)]; measured Eyp Iy y-y coin.Ge(Li) detectors. 3Rb, 3Sr, 93Y deduced levels, J, r, log ft. Mass-separated Kr activity.
After beta decay the daughter nucleus is often left in an excited state. This nucleus will then usually de-excite by means of an electromagnetic transition in which a gamma ray is emitted. The theory of such electromagnetic processes is contained in Maxwell's equations. These equations can be expressed in terms of a vector potential (I) and a scalar po tential ((j)). Nuclear states have a definite angular momentum and parity because the nuclear Hamiltonian is invariant under rotations and reflections. Using this fact, it is advisable to carry out a multipole expansion of the vector potential (A). Once this is done it is the multipole potential which
After beta decay the daughter nucleus is often left in an excited state. This nucleus will then usually de-excite by means of an electromagnetic transition in which a gamma ray is emitted. The theory of such electromagnetic processes is contained in Maxwell's equations. These equations can be expressed in terms of a vector potential (I) and a scalar po tential ((j)). Nuclear states have a definite angular momentum and parity because the nuclear Hamiltonian is invariant under rotations and reflections. Using this fact, it is advisable to carry out a multipole expansion of the vector potential (A). Once this is done it is the multipole potential which
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