Total absorption spectroscopy study of the 
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 decay of 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">Br</mml:mi><mml:mprescripts /><mml:none /><mml:mn>86</mml:mn></mml:mmultiscripts></mml:math>
 and 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">Rb</mml:mi><mml:mprescripts /><mml:none /><mml:mn>91</mml:mn

Rice, S.; Algora, A.; Taín, J. L.; Valencia, E.; Agramunt, J.; Rubio, B.; Gelletly, W.; Regan, P. H.; Zakari-Issoufou, A.-A.; Fallot, M.; Porta, A.; Rissanen, J.; Eronen, T.; Äystö, J.; Batist, L.; Bowry, M.; Bui, V. M.; Caballero-Folch, R.; Cano-Ou, D.; Elomaa, V.‐V.; Estévez, Emma; Farrelly, G. F.; Garcia, A.; Gomez-Hornillos, B.; Gorlychev, V.; Hakala, J.; Jordan, M. D.; Jokinen, A.; Kolhinen, V. S.; Kondev, F. G.; Martínez, T.; Mason, P.; Mendoza, E.; Moore, I. D.; Penttilä, H.; Podolyák, Zs.; Reponen, M.; Sonnenschein, V.; Sonzogni, A. A.; Sarriguren, P.

doi:10.1103/physrevc.96.014320

Cited by 40 publications

(32 citation statements)

References 46 publications

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“…In terms of decay data, there are several evaluated public databases available. Of these, the Evaluated Nuclear Structure Data File (ENSDF) database is well-known but recent total absorption gamma spectroscopy (TAGS) [34][35][36] measurements have identified several discrepancies regarding branching ratios and level density. Previous measurements suffered from the so-called Pandemonium effect [37], where due to the rapidly decreasing efficiency of Germanium detectors for high γ energies de-excitations from highly excited states were missed, thereby overestimating β branching ratios to low-lying states.…”

Section: A Database Selectionmentioning

confidence: 99%

First-forbidden transitions in the reactor anomaly

et al. 2019

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We describe here microscopic calculations performed on the dominant forbidden transitions in reactor antineutrino spectra above 4 MeV using the nuclear shell model. By taking into account Coulomb corrections in the most complete way, we calculate the shape factor with the highest fidelity and show strong deviations from allowed approximations and previously published results. Despite small differences in the ab initio electron cumulative spectra, large differences on the order of several percents are found in the antineutrino spectra. Based on the behaviour of the numerically calculated shape factors we propose a parametrization of forbidden spectra. Using Monte Carlo techniques we derive an estimated spectral correction and uncertainty due to forbidden transitions. We establish the dominance and importance of forbidden transitions in both the reactor anomaly and spectral shoulder analysis. Based on these results, we conclude that a correct treatment of forbidden transitions is indispensable in both the normalization anomaly and spectral shoulder.

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Section: A Database Selectionmentioning

confidence: 99%

First-forbidden transitions in the reactor anomaly

et al. 2019

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“…Since [10], we have performed TAGS experimental campaigns leading to the correction of fifteen nuclear decays of major relevance for the reactor antineutrino spectra. Though their relative impacts have been evaluated in [29,[31][32][33][34][35], the resulting absolute detected antineutrino energy spectrum after their inclusion has never been studied. In this paper, we have assessed for the first time this spectrum without any renormalisation computed with an updated SM model.…”

mentioning

confidence: 99%

“…The SM model taking into account TAGS results for 102,104,105,106,107 Tc, 105 Mo and 101 Nb [31] will be called SM-2012 [29] hereinafter. The additional inclusion of 92,94 Rb and 87,88 Br [32,33] and of 91 Rb, 86 Br [34] will lead to the SM-2015 and SM-2017 models respectively. Eventually, the SM-2018 model takes moreover into account TAGS data for 100,100m,102,102m Nb [35] that were found to have a large impact on the antineutrino spectra.…”

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confidence: 99%

Updated Summation Model: An Improved Agreement with the Daya Bay Antineutrino Fluxes

et al. 2019

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A new summation method model of the reactor antineutrino energy spectrum is presented. It is updated with the most recent evaluated decay databases and with our Total Absorption Gammaray Spectroscopy measurements performed during the last decade. For the first time the spectral measurements from the Daya Bay experiment are compared with the detected antineutrino energy spectrum computed with the updated summation method without any renormalisation. The results exhibit a better agreement than is obtained with the Huber-Mueller model in the 2 to 5 MeV range, the region which dominates the detected flux. An unexpected systematic trend is found that the detected antineutrino flux computed with the summation model decreases with the inclusion of more Pandemonium free data. The detected flux obtained now lies only 1.9% above that detected in the Daya Bay experiment, a value that may be reduced with forthcoming new Pandemonium free data leaving less and less room to the reactor anomaly. Eventually, the new predictions of individual antineutrino spectra for the 235 U, 239 Pu, 241 Pu and 238 U are used to compute the dependence of the reactor antineutrino spectral shape on the fission fractions.

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“…3. The summing-pileup distortion, present in all our measurements, was calculated as in previous works [16,18,19,47] with a Monte Carlo (MC) procedure based on the random superposition of two stored events within the ADC gate [46,48].…”

Section: Methodsmentioning

confidence: 99%

“…It can be avoided using the Total Absorption γ-ray Spectroscopy (TAGS) technique, which relies on the use of γ-ray calorimeters to detect the full γ cascades that follow the β decay [11,12]. The potential of using the TAGS technique in β decay measurements important for reactor calculations has already been demonstrated [13][14][15][16][17][18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Total absorption γ -ray spectroscopy of niobium isomers

Guadilla¹,

Algora²,

Taín³

et al. 2019

Phys. Rev. C

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The β intensity distributions of the decays of 100gs,100m Nb and 102gs,102m Nb have been determined using the Total Absorption γ-Ray Spectroscopy technique. The JYFLTRAP double Penning trap system was employed to disentangle the isomeric states involved, lying very close in energy, in a campaign of challenging measurements performed with the Decay Total Absorption γ-ray Spectrometer at the Ion Guide Isotope Separator On-Line facility in Jyväskylä. The low-spin isomeric state of each niobium case was populated through the decay of the zirconium parent, that was treated as a contaminant. We have applied a method to extract this contamination, and additionally we have obtained β intensity distributions for these zirconium decays. The β-strength distributions evaluated with these results were compared with calculations in quasiparticle random-phase approximation, suggesting a prolate configuration for the ground states of 100,102 Zr. The footprint of the Pandemonium effect was found when comparing our results for the analyses of the niobium isotopes with previous decay data. The β-intensities of the decay of 102m Nb were obtained for the first time. A careful evaluation of the uncertainties was carried out, and the consistency of our results was validated taking advantage of the segmentation of our spectrometer. The final results were used as input in reactor summation calculations. A large impact on antineutrino spectrum calculations was already reported and here we detail the significant impact on decay heat calculations.

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Total absorption spectroscopy study of the β decay of Br86 and Rb91

Cited by 40 publications

References 46 publications

First-forbidden transitions in the reactor anomaly

First-forbidden transitions in the reactor anomaly

Updated Summation Model: An Improved Agreement with the Daya Bay Antineutrino Fluxes

Total absorption γ -ray spectroscopy of niobium isomers

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