By Norwood B. Gove

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Read or Download Nuclear Spin-Parity Assignments. Proceedings of the Conference on Bases for Nuclear Spin–Parity Assignments, Gatlinburg, Tennessee, November 11–13, 1965 PDF

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Extra info for Nuclear Spin-Parity Assignments. Proceedings of the Conference on Bases for Nuclear Spin–Parity Assignments, Gatlinburg, Tennessee, November 11–13, 1965

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3 as compared to their photon intensities in fig. k. The K conversion coefficients of the k+ to k+, 675 keV, 2+ to 2+, 692 keV and 2- to 2+, 723 keV transitions along with the theoretical El and E2 conversion coefficients are given in table V. The conversion electron data of Brantley et al 19) were used in the analysis. The large conversion coefficients of the 675 and 692 keV transitions are explained by large EO admixtures. ) and accur­ ate gamma, intensities ^' obtained with a, Li-Ge detector.

Method CO Methods of Measuring Conversion Coefficients Measuring equipment Advantages Disadvantages X-rayNal (Tl), Li-Ge, or to -gamma - bent crystal peak Speed of recording, bent crystal slower Applicable to simple decays or where another transition can serve as coincidence gate. Severely limited if E-capture present. Peak-tobeta spectrum Magnetic spectrometer Good accuracy in favor­ able decays Applicable to only a few simple decay schemes. Limited by know­ ledge of beta spectrum shape. z c Π r~ m Absolute e and 7 counting Ionization chamber Very good accuracy Limited to very simple decays.

Fig. 4 shows SlivTs predictions for the L J / L J J and L J / L H I ratios for the same Z values as In Fig. 3. When the L-subshell lines can be resolved one has in general a more sensitive multipolarity detector and moreover one can check for consistency between any of the three ratios. We note in parti­ cular that L-subshell measurements distinguish very clearly between magnetic (ß) and electric (a) multipoles. For the most commonly occurring transitions, El, Ml, and E2,the theory thus provides a very power­ ful tool in establishing multipolarity.

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