Precision measurements of the half-lives of nuclides

Abzouzi, A.; Antony, M. S.; Ndongué, V. B. Ndocko

doi:10.1007/bf02165454

Cited by 31 publications

(6 citation statements)

References 9 publications

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“…The first published values (from 1958 and 1990) for the determination of the half-life used 177 Lu from the 176 Lu(n,γ ) 177 Lu reaction, however no correction was applied for the presence of the 177m Lu impurity, resulting in an overestimation of the half-lives values determined [6][7][8]10], with the exception of the value reported by Lagoutine and Legrand (1982) [9].…”

Section: Discussionmentioning

confidence: 99%

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Half-life measurement of the medical radioisotope ¹⁷⁷Lu produced from the ¹⁷⁶Yb(n,γ) reaction

2017

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Abstract. 177 Lu is a medium energy beta-emitter commonly used in Nuclear Medicine for radiotherapeutic applications. In this work, the half-life of 177 Lu has been measured using a re-entrant ionisation chamber over a period of 82 days (approximately 12 half-lives). Unlike the majority of previous studies, the material used in this work was produced via the 176 Yb(n,γ ) 177 Yb reaction followed by the β-decay to 177 Lu, producing insignificant quantities of 177m Lu. This has resulted in the most precise half-life measurement of 177 Lu to date. A half-life of 6.6430 (11) days has been determined. This value is in statistical agreement with the currently recommended half-life of 6.6463 (15) days (z-score = 1.8).

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Section: Discussionmentioning

confidence: 99%

“…There have been 14 previous publications reporting half-life measurements of 177 Lu [6][7][8][9][10][11][12][13][14][15][16][17][18][19], which are summarised in Table 1. Of these only the measurement reported by Dryak et al [18] has used 177 Lu from production method 2) and therefore not required corrections for the 177m Lu impurity.…”

Section: Introductionmentioning

confidence: 99%

Half-life measurement of the medical radioisotope ¹⁷⁷Lu produced from the ¹⁷⁶Yb(n,γ) reaction

2017

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“…In this case, a search by using low-background γ spectrometry can be implemented. Moreover, because the 175 Yb is unstable via β − decay with T 1/2 = 4.185(1) d [36], the 179 Hf to the g.s. of daughter 175 Yb can be evaluated using the mentioned passive technique.…”

Section: Searching For Alpha Decays In Hafnium Isotopesmentioning

confidence: 99%

Investigation on Rare Nuclear Processes in Hf Nuclides

et al. 2022

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In this work, a review of recent studies concerning rare nuclear processes in Hf isotopes is presented. In particular, the investigations using HP-Ge spectrometry and Hf-based crystal scintillators are focused; the potentiality and the results of the “source = detector” approach are underlined. In addition, a short introduction concerning the impact of such kind of research in the context of astroparticle and nuclear physics is pointed out. In particular, the study of α decay and double beta decay of 174Hf, 176Hf, 177Hf, 178Hf, 179Hf, 180Hf isotopes either to the ground state or to the lower bounded levels have been discussed. The observation of α decay of 174Hf isotope to the ground state with a T1/2=7.0(1.2)×1016 y is reported and discussed. No decay was detected for α decay of 174Hf isotope at the first excited level of daughter and of 176Hf, 177Hf, 178Hf, 179Hf, 180Hf isotopes either to the ground state or to the lower bounded levels. The T1/2 lower limits for these decays are at the level of 1016–1020 y. Nevertheless, the T1/2 lower limits for the transitions of 176Hf→172Yb (0+→0+) and 177Hf→173Yb (7/2−→5/2−) are near to the theoretical predictions, giving hope to their observation in the near future. All the other experimental limits (∼1016–1020 y) are absolutely far from the theoretical expectations. The experiments investigating the 2ϵ and ϵβ+ processes in 174Hf are also reported; the obtained half-life limits are set at the level of 1016–1018 y. Moreover, we estimate the T1/2 of 2ν2ϵ of 174Hf decay at the level of (0.3–6) × 1021 y (at now the related measured lower limit is 7.1×1016 y).

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“…16(20) min. 1993 [12] 1989 [6] 1968 [13] 1958 [14] 1952 [15] 1952 [16] 1951 [17] 1950 [18] 1938 [19] 1937 [20] t 1/2 / min Figure 6. The literature 31 Si half-life values compared with the result obtained in this study.…”

Section: Comparison With Literature Datamentioning

confidence: 99%

“…Although the data used to derive the recommended value are not discrepant, a close check of the referenced papers confirms the lack of details on experiments and uncertainty evaluation. For example, the uncertainty of one of the most recent published data [6] was intentionally increased from 0.012 min to 0.5 min by evaluators [5] to account for systematic effects.…”

Section: Introductionmentioning

confidence: 99%

A new low-uncertainty measurement of the³¹Si half-life

et al. 2017

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Half-life values are widely used in nuclear chemistry to model the exponential decay of the activity of radionuclides. The analysis of existing half-life data values reveals a general lack of information on the performed experiments and, in a few cases, an almost complete absence of uncertainty budgets. This is the situation for 31 Si, the radionuclide produced via neutron capture reaction recently used to quantify trace amounts of 30 Si in a sample of the 28 Si-enriched material produced for the determination of the Avogadro constant. In particular, the now recommended 157.36(26) min value is the weighted average of ten data acquired between the 40's and the 90's and published without a detailed discussion of the uncertainty budget. In order to improve the 31 Si half-life value we carried out repeated observations of the 31 Si decay rate via γ-ray spectrometry measurements. This paper reports the result we obtained, including details of the experiment and the evaluation of the uncertainty.

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Precision measurements of the half-lives of nuclides

Cited by 31 publications

References 9 publications

Half-life measurement of the medical radioisotope ¹⁷⁷Lu produced from the ¹⁷⁶Yb(n,γ) reaction

Half-life measurement of the medical radioisotope ¹⁷⁷Lu produced from the ¹⁷⁶Yb(n,γ) reaction

Investigation on Rare Nuclear Processes in Hf Nuclides

A new low-uncertainty measurement of the³¹Si half-life

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Precision measurements of the half-lives of nuclides

Cited by 31 publications

References 9 publications

Half-life measurement of the medical radioisotope 177Lu produced from the 176Yb(n,γ) reaction

Half-life measurement of the medical radioisotope 177Lu produced from the 176Yb(n,γ) reaction

Investigation on Rare Nuclear Processes in Hf Nuclides

A new low-uncertainty measurement of the31Si half-life

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Product

Resources

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Half-life measurement of the medical radioisotope ¹⁷⁷Lu produced from the ¹⁷⁶Yb(n,γ) reaction

Half-life measurement of the medical radioisotope ¹⁷⁷Lu produced from the ¹⁷⁶Yb(n,γ) reaction

A new low-uncertainty measurement of the³¹Si half-life