Nuclear Data Sheets for A = 237

Basunia, M. S.

doi:10.1016/j.nds.2006.07.001

Cited by 68 publications

(37 citation statements)

References 211 publications

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“…Since no α decay of 241 Am to an excited level of 237 Np with energy larger than 0.8 MeV has been observed, to our knowledge and in the decay scheme of 241 Am [20] 2 , a contribution of 241 Am decay in the applied coincidence energy windows is not expected. Hence, a possible excess with respect to the data obtained when running without sources is due to the sources but not directly to the known 241 Am decay scheme [20].…”

Section: The First Dedicated Runmentioning

confidence: 75%

“…The scatter plots in Fig. 1b [20] obtained by simulation (the number of displayed events is normalized to the same time as the case a) and applying the sources activities given in Table 2 Fig. 1a) with E 1 in the 100-150 keV energy window, the spectrum of E 2 is produced and reported in Fig.…”

Section: The Cumulative Resultsmentioning

confidence: 99%

“…The detailed decay scheme of 241 Am can be found in Ref. [20]. The energy spectrum measured by the DAMA/LIBRA detectors, when irradiated by the 241 Am sources, has been accurately reproduced by a suitable MonteCarlo simulation, which takes into account the decay scheme of 241 Am [20] and the activities of the sources.…”

Section: The Experimental Set-up and The Data Taking Conditionsmentioning

confidence: 99%

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New search for correlated e+e- pairs in the $ \alpha$ decay of 241Am

et al. 2013

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A new search for production of correlated e + e − pairs in the α decay of 241 Am has been carried out deep underground at the Gran Sasso National Laboratory of the I.N.F.N. by using pairs of NaI(Tl) detectors of the DAMA/LIBRA setup. The experimental data show an excess of double coincidences of events with energy around 511 keV in faced pairs of detectors, which are not explained by known side reactions. This measured excess gives a relative activity λ = (4.70 ± 0.63)×10 −9 for the Internal Pair Production (IPP) with respect to alpha decay of 241 Am; this value is of the same order of magnitude as previous determinations. In a conservative approach the upper limit λ < 5.5 × 10 −9 (90% C.L.) can be derived. It is worth noting that this is the first result on IPP obtained in an underground experiment, and that the λ value obtained in the present work is independent on the live-time estimate.

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Section: The First Dedicated Runmentioning

confidence: 75%

Section: The Cumulative Resultsmentioning

confidence: 99%

Section: The Experimental Set-up and The Data Taking Conditionsmentioning

confidence: 99%

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New search for correlated e+e- pairs in the $ \alpha$ decay of 241Am

et al. 2013

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“…The detection efficiency as a function of position from the detector head yields an additional variation of ±2% due to the target holder position. (35.90 ± 0.07)% [17]. In addition, in the range between 70 keV and 80 keV, full energy true coincidence summing peaks of the three X-rays and the main γ-ray line of 241 Am are clearly visible.…”

Section: Figmentioning

confidence: 88%

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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“…[3]. Differences in the recommended half-lives when compared with the equivalent data from recent ENSDF evaluations [4,5] arise from variations in the evaluation technique [1,3,6], especially the use of the limitation of relative statistical weights (LRSW method) in the DDEP statistical procedure.…”

Section: Half-livesmentioning

confidence: 99%

Decay Data Evaluation Project (DDEP): evaluation of the ²³⁷U, ²³⁶Np, ^236mNp and ²⁴¹Pu decay characteristics

Chechev

Kuzmenko

2007

Nd2007

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Nuclear Data Sheets for A = 237

Cited by 68 publications

References 211 publications

New search for correlated e+e- pairs in the $ \alpha$ decay of 241Am

New search for correlated e+e- pairs in the $ \alpha$ decay of 241Am

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

Decay Data Evaluation Project (DDEP): evaluation of the ²³⁷U, ²³⁶Np, ^236mNp and ²⁴¹Pu decay characteristics

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Nuclear Data Sheets for A = 237

Cited by 68 publications

References 211 publications

New search for correlated e+e- pairs in the $ \alpha$ decay of 241Am

New search for correlated e+e- pairs in the $ \alpha$ decay of 241Am

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

Decay Data Evaluation Project (DDEP): evaluation of the 237U, 236Np, 236mNp and 241Pu decay characteristics

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Decay Data Evaluation Project (DDEP): evaluation of the ²³⁷U, ²³⁶Np, ^236mNp and ²⁴¹Pu decay characteristics