Coulomb excitation of 99Tc

doi:10.1016/0375-9474(76)90653-9

Nuclear Physics A

Volume 267, 16 August 1976, Pages 190-204

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Abstract

The nucleus ⁹⁹Tc has been studied in Coulomb excitation with ⁴He and ^16O, and $132^{+} and 112^{+}$ states are suggested at 762.0 and 726.7 keV, respectively. Two new levels at 625.4 and 1081.4 keV were established on basis of γ-γ coincidence relations. The lifetimes of the levels at 726.7, 761.7, 762.0 and 1081.4 keV were measured by means of the Doppler shift attenuation method using ¹⁶O ions and the half-lives obtained were 1.8±0.2, 0.7±0.4, 2.4±0.3 and 0.9±0.3 ps, respectively. With exception for the lowest $52^{+}$ state the level energies and reduced E2 and M1 transition probabilities are in fair agreement with the values calculated within the cluster-phonon coupling (Alaga) model.

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Abstract: The experimental nuclear structure data for ⁹⁹Tc have been compiled and evaluated. Extensive revisions to the adopted levels, gammas and high-spin data sets for this nuclide have been made based on the detailed new ( 3 He,png) study by 1998Cr01. This revision supersedes earlier ⁹⁹Tc data contained in the A=99 evaluation published by L.K. Peker, Nuclear Data Sheets 73, 1 (1994) with literature coverage up to Aug. 1, 1994.
Study of 99Mo and 111Ag decays
1992, International Journal of Radiation Applications and Instrumentation. Part
The intensities of K x- and γ-rays emitted following the decays of ⁹⁹Mo and ¹¹¹Ag have been measured with better precision using four well calibrated semiconductor detectors. These intensity results have been further used to deduce the photon emission probabilities of various γ-transitions deexciting these radionuclides. The 158.9 and 162.5 keV γ-rays have been identified and placed through coincidence evidence to be in the level scheme of ⁹⁹Tc while 11 γ-rays, proposed in the earlier investigations of ⁹⁹Mo decay, have been discarded. This rules out the possibility of the existence of levels at 163, 727, 762 and 1082 keV. The intensities for K x-rays emitted following the decay of ¹¹¹Ag are reported for the first time.
Nuclear Data Sheets for A=99
1986, Nuclear Data Sheets
Low-lying levels in 97Tc
1980, Nuclear Physics, Section A
The decay properties of levels in ⁹⁷Tc up to an excitation energy of 1.0 MeV have been investigated via the ⁹⁷Mo(p, nγ) reaction. Several ambiguities in the ⁹⁷Tc level scheme could be cleared up by a precise assessment of γ-ray energies and intensities, and by nγ and γγ coincidence measurements. For instance the energy of the first $32$ ⁻ excited state must be definitely revised from 574.2 keV to 580.1 keV. Moreover, the existence of reported levels at 807, 849, 896, and 940 keV is not supported by the present data whereas new states at 772, 832, 861, and 946 keV have been definitely established. These new levels have been assigned $J^{π} = 132^{+}$ , $112^{+}$ , $92^{+}$ and $32^{−}$ , respectively.

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^†: On sabbatical leave from Washington University, St. Louis, Missouri 63130, USA.

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Nuclear Physics A

Abstract

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Nuclear level schemes

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