Partial half-lives of alpha decay of 151Tb and 149Tb nuclei
Abstract
The alpha branching ratios λα/λtot were measured, and partial half-lives of alpha decay for 151Tb and 149Tb nuclei were determined. The alpha branching ratios λα/λtot were obtained by the determination of the ratio of intensities of suitably chosen electron conversion lines in Gd and Eu nuclei produced from 151Tb and 149Tb nuclei by electron capture and alpha decay, respectively. The obtained values of λα/λtot are 5±1.5 × 10−6 for 151Tb and 2±0.6 × 10−1 for 149Tb. Alpha reduced widths and hindrance factors F were calculated.
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Nuclear Structure and Decay Data for A=149 Isobars
2022, Nuclear Data SheetsExperimental nuclear structure and decay data are evaluated for all the 17 known nuclides of mass 149 (Xe, Cs, Ba, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb). Detailed compiled and evaluated spectroscopic information is presented for each reaction and decay dataset, and recommended values are provided for level properties, α, β and γ radiations, and other spectroscopic parameters, based on an evaluation of all the available experimental data for A=149 isobaric nuclides. Although large amounts of nuclear spectroscopic data are available for nuclides of A=149, yet large gaps in knowledge exist, as described below. For the lowest atomic number nuclide 149Xe, only the isotopic identification has been made, with no data for its ground-state half-life. For 149Cs, 149Tm and 149Yb information is available for only the respective ground states. For 149Ba, 149La and 149Er, limited data exist for excited states. Many of the decay schemes of radioactive nuclei of A=149 are considered as incomplete, either due to large energy differences between the highest observed excited states in daughter nuclides and the respective Q-values, or due to the lack of confirmed γ-ray data, as listed below: 149Cs → 149Ba, 149Ba → 149La, 149La → 149Ce, 149Ce → 149Pr, 149Pr → 149Nd, 149Tb(4.17 min) → 149Gd, 149Ho(21.0 s and 56 s) → 149Dy, 149Er(4 s and 9.6 s) → 149Ho, and 149Tm → 149Er. No data exist for the decay of 149Yb to 149Tm. Data for half-lives of the excited states in this mass chain are generally lacking as given below by the number of excited levels of known half-life / approximate number of known levels in a nuclide: 2/17 for 149Ba, 0/18 for 149La, 3/53 for 149Ce, 3/44 for 149Pr, 17/110 for 149Nd, 9/90 for 149Pm, 10/210 for 149Sm, 2/125 for 149Eu, 6/270 for 149Gd, 5/200 for 149Tb, 3/80 for 149Dy, 3/90 for 149Ho, and 3/14 for 149Er. This work supersedes earlier evaluations of A=149 nuclides published by 2004Si16, 1994Si18, 1985Sz01 and 1976Ho17.
Nuclear Data Sheets for A=147
2022, Nuclear Data SheetsThis work represents an update of the previous evaluation of the nuclear data on the A=147 nuclides (2009Ni02). The experimental data from reaction and decay studies leading to the following nuclides have been reviewed: 147I, 147Xe, 147Cs, 147Ba, 147La, 147Ce, 147Pr, 147Nd, 147Pm, 147Sm, 147Eu, 147Gd, 147Tb, 147Dy, 147Ho, 147Er, 147Tm. These data are presented, together with the adopted level schemes and their properties. 147Pm nuclide and half-life of 147Nd were evaluated by Balraj Singh (McMaster University; [email protected]). All the other nuclei were evaluated by Ninel Nica (Texas A&M University; [email protected]).
Nuclear Data Sheets for A = 147
2009, Nuclear Data SheetsThe 1992 evaluation of A = 147 (1992De38) was updated using data available prior to Nov. 14, 2008.
Nuclear Data Sheets for A = 145
2009, Nuclear Data SheetsThe evaluators present in this publication spectroscopic data and level schemes from radioactive decay and nuclear reactions for all isobars with mass number A = 145.
Nuclear data sheets for A = 149
2004, Nuclear Data SheetsNuclear spectroscopic information for known nuclides of mass number 149 (Cs,Ba,La,Ce,Pr,Nd,Pm,Sm,Eu, Gd,Tb,Dy,Ho,Er,Tm,Yb) with Z=55 to 70 and N=94 to 79 have been evaluated and presented together with adopted energies and Jπof levels in these nuclei. No excited state data are yet available for 149Cs, 149Ba, 149La, 149Tm and 149Yb. The existence of 149Cs is reported from mass separation of products from U(p,X) reaction and that of 149Yb from proton decays of 150Lu g.s. and 150Lu isomer. There are no half-life data for 149Cs and 149Yb. In 149Gd, 12 excited superdeformed bands have been reported, in addition to the yrast (g.s.) superdeformed band. In 149Tb, five superdeformed bands are known, whereas in 149Dy there is some evidence of superdeformation, but no discrete gamma rays have been found. The half-life of fully-ionized 149Dy isomer at 2661 keV has been reported to be 11 s, as compared to 0.49 s for the neutral atom. This evaluation supersedes previous full evaluations of A=149 by Nucl. Data Sheets 46 (1985) 1 and Nucl. Data Sheets 19 (1976) 337 and a midstream (in update mode) evaluation by Nucl. Data Sheets 73 (1994) 351
Nuclear Data Sheets Update for A = 149
1994, Nuclear Data SheetsNuclear spectroscopic information for known nuclitides of mass number 149 (Cs,Ba,La,Ce,Pr,Nd,Pm,Sm,Eu,Gd,Tb,Dy,Ho,Er,Tm,Yb) with Z=55 to 70 and N=94 to 79 have been evaluated and presented together with adopted energies and Jπ of levels in these nuclei. No excited state data are yet available for 149Cs, 149Ba, 149La, 149Ce, 149Tm, and 149Yb. The existence of 149Cs is reported from mass separation of products from U(p,X) reaction and that of 149Yb from proton decay of 150Lu. There are no half-life data for 149Cs and 149Yb. No data are available for 149Xe but this nucleus was included in mass systematics study of 88Ha24. This evaluation represents a revision of earlier Nuclear Data Sheets for A=149 (85Sz01,76Ho17). In 149gd, nine excited superdeformed bands have been reported, in addition to the yrast (g. s.) superdeformed band.