Half-life of 60Fe

Kutschera, W.; Billquist, P.J.; Frekers, D.; Henning, W.; Jensen, K. J.; Xiuzeng, Ma; Pardo, R. C.; Paul, M.; Rehm, K. E.; Smither, R.K.; Yntema, J.L.; Mausner, L.F.

doi:10.1016/0168-583x(84)90555-x

Cited by 60 publications

(26 citation statements)

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“…Combining this work's activity measurement with the AMS measurements performed instead by Wallner et al gives a half-life value of (2.72 ± 0.16) × 10 6 years, also confirming a substantially longer half-life value than previously accepted. [11], Wallner et al [12], and this work agree on a longer half-life than the previously accepted value of Kutschera et al [10].…”

Section: Resultscontrasting

confidence: 48%

“…Therefore a longer half-life value could not be ruled out. Kutschera et al measured the half-life in 1984, finding (1.49 ± 0.27) × 10 6 years by a combination of an activity and an Accelerator Mass Spectrometry (AMS) measurements [10]. However, the complex AMS experiment may have resulted in a somewhat lower 60 Fe isotopic ratio in the sample material than was actually present.…”

Section: Arxiv:161200006v2 [Nucl-ex] 2 Mar 2017mentioning

confidence: 99%

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Activity measurement of Fe60 through the decay of Co60m and confirmation of its half-life

et al. 2017

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The half-life of the neutron-rich nuclide, 60 Fe has been in dispute in recent years. A measurement in 2009 published a value of (2.62 ± 0.04) × 10 6 years, almost twice that of the previously accepted value from 1984 of (1.49 ± 0.27) × 10 6 years. This longer half-life was confirmed in 2015 by a second measurement, resulting in a value of (2.50 ± 0.12) × 10 6 years. All three half-life measurements used the grow-in of the γ-ray lines in 60 Ni from the decay of the ground state of 60 Co (t 1/2 =5.27 years) to determine the activity of a sample with a known number of 60 Fe atoms. In contrast, the work presented here measured the 60 Fe activity directly via the 58.6 keV γ-ray line from the short-lived isomeric state of 60 Co (t 1/2 =10.5 minutes), thus being independent of any possible contamination from long-lived 60g Co. A fraction of the material from the 2015 experiment with a known number of 60 Fe atoms was used for the activity measurement, resulting in a half-life value of (2.72 ± 0.16) × 10 6 years, confirming again the longer half-life. In addition, 60 Fe/ 56 Fe isotopic ratios of samples with two different dilutions of this material were measured with Accelerator Mass Spectrometry (AMS) to determine the number of 60 Fe atoms. Combining this with our activity measurement resulted in a half-life value of (2.69 ± 0.28) × 10 6 years, again agreeing with the longer half-life.

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Section: Resultscontrasting

confidence: 48%

Section: Arxiv:161200006v2 [Nucl-ex] 2 Mar 2017mentioning

confidence: 99%

Activity measurement of Fe60 through the decay of Co60m and confirmation of its half-life

et al. 2017

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“…The value of T 1/2 = 2.61 ± 0.04 Ma determined by Rugel et al (2009) was confirmed recently by additional independent measurements (Wallner et al 2015; Ostdiek et al 2017). The new value is one order of magnitude higher than the first estimate of T 1/2 = 0.3 ± 0.9 Ma (Roy and Kohman 1957) and ~75% higher than the previously adopted value of T 1/2 = 1.49 ± 0.27 Ma (Kutschera et al 1984).…”

Section: Introductionmentioning

confidence: 99%

⁵³Mn and ⁶⁰Fe in iron meteorites—New data, model calculations

Leya

David

Froehlich

et al. 2020

Meteorit & Planetary Scien

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We measured specific activities of the long-lived cosmogenic radionuclides 60 Fe in 28 iron meteorites and 53 Mn in 41 iron meteorites. Accelerator mass spectrometry was applied at the 14 MV Heavy Ion Accelerator Facility at ANU Canberra for all samples except for two which were measured at the Maier-Leibnitz Laboratory, Munich. For the large iron meteorite Twannberg (IIG), we measured six samples for 53 Mn. This work doubles the number of existing individual 60 Fe data and quadruples the number of iron meteorites studied for 60 Fe. We also significantly extended the entire 53 Mn database for iron meteorites. The 53 Mn data for the iron meteorite Twannberg vary by more than a factor of 30, indicating a significant shielding dependency. In addition, we performed new model calculations for the production of 60 Fe and 53 Mn in iron meteorites. While the new model is based on the same particle spectra as the earlier model, we no longer use experimental cross sections but instead use cross sections that were calculated using the latest version of the nuclear model code INCL. The new model predictions differ substantially from results obtained with the previous model. Predictions for the 60 Fe activity concentrations are about a factor of two higher; for 53 Mn, they are~30% lower, compared to the earlier model, which gives now a better agreement with the experimental data.

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“…In addition to the high flux requirements, very long exposure times lead to time-consuming and expensive procedures. In 2009, the consequence was that basic nuclear data of 60 Fe were either not very precise, like the half-life (only two measurements have been performed till that time [11,12]) or completely missing, like the neutron capture cross sections of 60 Fe, which could be determined using a new sample material from a source described below [13].…”

Section: Introductionmentioning

confidence: 99%

Quantification of 60Fe atoms by MC-ICP-MS for the redetermination of the half-life

2013

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In many scientific fields, the half-life of radionuclides plays an important role. The accurate knowledge of this parameter has direct impact on, e.g., age determination of archeological artifacts and of the elemental synthesis in the universe. In order to derive the half-life of a long-lived radionuclide, the activity and the absolute number of atoms have to be analyzed. Whereas conventional radiation measurement methods are typically applied for activity determinations, the latter can be determined with high accuracy by mass spectrometric techniques. Over the past years, the half-lives of several radionuclides have been specified by means of multiple-collector inductively coupled plasma mass spectrometry (MC-ICP-MS) complementary to the earlier reported values mainly derived by accelerator mass spectrometry. The present paper discusses all critical aspects (amount of material, radiochemical sample preparation, interference correction, isotope dilution mass spectrometry, calculation of measurement uncertainty) for a precise analysis of the number of atoms by MC-ICP-MS exemplified for the recently published half-life determination of 60Fe (Rugel et al, Phys Rev Lett 103:072502, 2009).

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Half-life of 60Fe

Cited by 60 publications

References 10 publications

Activity measurement of Fe60 through the decay of Co60m and confirmation of its half-life

Activity measurement of Fe60 through the decay of Co60m and confirmation of its half-life

⁵³Mn and ⁶⁰Fe in iron meteorites—New data, model calculations

Quantification of 60Fe atoms by MC-ICP-MS for the redetermination of the half-life

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Half-life of 60Fe

Cited by 60 publications

References 10 publications

Activity measurement of Fe60 through the decay of Co60m and confirmation of its half-life

Activity measurement of Fe60 through the decay of Co60m and confirmation of its half-life

53Mn and 60Fe in iron meteorites—New data, model calculations

Quantification of 60Fe atoms by MC-ICP-MS for the redetermination of the half-life

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⁵³Mn and ⁶⁰Fe in iron meteorites—New data, model calculations