Unexpected increase of 
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 decay rate under compression

Ray, A.; Sikdar, A. K.; Das, P.; Pathak, S.; Datta, J.

doi:10.1103/physrevc.101.035801

Cited by 6 publications

(8 citation statements)

References 42 publications

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“…We find that WIEN2k predicts only ∼0.2% faster decay rate of 7 Be in Pd compared to that in Pb due to the compressional effect in the smaller Pd lattice. However, experimentally, a much larger increase (0.82 ± 0.16)% [15] of 7 Be decay rate in Pd lattice compared to that in Pb lattice was seen and hence, the experimentally observed much faster decay rate under compression could not be understood by the state-of-the-art calculations.…”

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confidence: 87%

“…Hence, it is conceivable that the standard density matrix and solar model calculations of the electron capture decay rate of 7 Be at the solar core at a pressure of 26.5 million GPa might be underpredicting the actual decay rate and hence, the 2% uncertainty assigned to the calculated 7 Be decay rate at the solar core[R(e)] is questionable. Considering the underprediction by the density functional calculations for the compressions achieved at the laboratory experiments, the uncertainty on the calculated electron-capture nuclear decay rate of 7 Be at the solar core [R(e)] could be as high as ∼10% [15].…”

Section: Astrophysical and Geophysical Implicationsmentioning

confidence: 99%

“…So, Ray et al [15] implanted 7 Be in Pd and Pb [facecentered cubic lattice: lattice constant = 4.95Å; electron affinity = 0.37 eV] [14] and found that the decay rate of 7 Be is faster in the smaller Pd lattice compared that in the larger Pb lattice by (0.82 ± 0.16)%. Since the electron affinities of both Pd and Pb are very small and similar, the observed increase of decay rate in the smaller Pd lattice could be attributed to the effect of compression on 7 Be atom in the smaller confinement.…”

mentioning

confidence: 99%

“…We have summarized our results in Table -1, showing the combined effect of the electron affinity and lattice compression on the change of the decay rate of 7 Be. Recently, the effect of lattice compression on the decay rate of 7 Be was observed [15] more directly by implanting 7 Be in the small Pd (electron affinity = 0.56 eV) and much larger Pb (electron affinity = 0.35 eV) lattices [14]. Since the electron affinities of Pd and Pb are very small and similar, we find from TB-LMTO calculations [29,30] that the change of the decay rate of 7 Be implanted in Pd and Pb due to the effect of different electron affinities would be negligible (< 0.1%).…”

mentioning

confidence: 99%

“…Since the electron affinities of Pd and Pb are very small and similar, we find from TB-LMTO calculations [29,30] that the change of the decay rate of 7 Be implanted in Pd and Pb due to the effect of different electron affinities would be negligible (< 0.1%). So, the observed increase [(0.82 ± 0.16)%] of 7 Be decay rate in Pd compared to that in Pb could be attributed to the effect of compression [15]. In order to determine the effect of compression on the electron density at 7 Be nucleus, we performed WIEN2k [17,18] density functional calculations for 7 Be atoms implanted in the interstitial spaces of the Pd and Pb lattices.…”

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confidence: 99%

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Electron capture nuclear decay rate under compression in a confined environment

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We have calculated the effect of compressing the radioactive atoms in the crystal lattice environments on their electron capture nuclear decay rates. The electronic structure calculations of solids using the density functional techniques have been used to calculate the change of electron density at the nuclei and the corresponding change of electron capture nuclear decay rate of the radioactive atoms confined to the interstitial spaces of different crystal lattices. The effects of finite nuclear size and vacuum polarization were considered in the calculations. It has been found that the calculations significantly underpredict the experimentally measured increase of electron capture nuclear decay rate under compression. The increase of decay rate due to compression-induced quantum anti-Zeno effect is generally believed to be very small because of very short duration of initial nonexponential decay time for the nuclear decays. However, this effect could be observable for the electron capture nuclear decay of 163 Ho, because of its very low decay energy. Moreover, certain models of quantum measurement indicate much longer initial nonexponential decay time and the corresponding implication on the increase of decay rate under compression is still not known. It is important to understand the large discrepancy between the measured and calculated increase of electron capture nuclear decay rate under compression and the associated role of quantum anti-Zeno effect because of their possible implications in various astrophysical and geophysical calculations. Contribution to the Topical Issue "Atoms and Molecules in a Confined Environment" edited by C. N.

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confidence: 87%

Section: Astrophysical and Geophysical Implicationsmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Electron capture nuclear decay rate under compression in a confined environment

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2023

Radioactivity

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Change in ⁷Be half-life in host media

Gholamian¹,

Firoozabadi²,

Sarhaddi³

2021

Chinese Phys. C

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First-principle calculations within the density functional theory framework are used to study the probability of electron capture for the 7Be nucleus. For this purpose, electron density at the 7Be nucleus is computed in Al, Au, Pd, Pt, and Pb environments. Our results show that the half-life of 7Be is changed by implanting 7Be in host environments. Electron affinity of the media and confinement effects are responsible for the change in the half-life of 7Be nucleus. Moreover, electric potential at the 7Be nucleus is calculated. Results show that variations in electric potential are usually consistent with those in electron density at the 7Be nucleus.

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Unexpected increase of Be7 decay rate under compression

Cited by 6 publications

References 42 publications

Electron capture nuclear decay rate under compression in a confined environment

Electron capture nuclear decay rate under compression in a confined environment

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Change in ⁷Be half-life in host media

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Unexpected increase of Be7 decay rate under compression

Cited by 6 publications

References 42 publications

Electron capture nuclear decay rate under compression in a confined environment

Electron capture nuclear decay rate under compression in a confined environment

References

Change in 7Be half-life in host media

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Change in ⁷Be half-life in host media