Nuclear excitation by electron transition on<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Au</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>197</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>by photoionization around the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>K</mml:mi><mml:mtext>−</mml:mtext></mml:mrow></mml:math>absorption edge

Kishimoto, Shunji; Yoda, Yoshitaka; Kobayashi, Yumiko; Kitao, Shinji; Haruki, Rie; Masuda, Ryo; Seto, Makoto

doi:10.1103/physrevc.74.031301

Cited by 27 publications

(31 citation statements)

References 13 publications

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“…Many of those experiments yielded conflicting results and the results differed significantly from theoretical estimates. Measurements on 197 Au and 193 Ir have provided evidence of NEET occurring and the results were near theoretical estimations [2][3][4]. One candidate isotope, 235 U, has a low-lying isomeric state at 76 eV and has been studied several times over the past 40 years.…”

Section: Introductionmentioning

confidence: 90%

“…This requirement is a consequence of electronic transitions typically having lower energy than nuclear transitions. Since it was predicted, numerous experiments to measure NEET in a variety of isotopes were conducted [2][3][4][5][6][7][8][9][10][11][12][13]. Many of those experiments yielded conflicting results and the results differed significantly from theoretical estimates.…”

Section: Introductionmentioning

confidence: 99%

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Nuclear excitation by electronic transition ofU235

et al. 2016

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Background: Nuclear excitation by electronic transition (NEET) is a rare nuclear excitation that can occur in isotopes containing a low-lying nuclear excited state. Over the past 40 years, several experiments have attempted to measure NEET of 235 U and those experiments have yielded conflicting results.Purpose: An experiment was performed in order to determine whether NEET of 235 U occurs, and to determine its excitation rate.Method: A pulsed Nd:YAG laser operating at 1064 nm with a pulse energy of 790 mJ and a pulse width of 9 ns was used to generate a uranium plasma. The plasma was collected on a catcher plate and electrons from the catcher plate were accelerated and focused onto a microchannel plate detector. An observation of a decay with a 26 minute half-life would suggest the creation of 235m U and the possibility that NEET of 235 U occurred.Results: A 26 minute decay consistent with the decay of 235m U was not observed and there was no evidence that NEET occurred. An upper limit for the NEET rate of 235 U was determined to be λNEET < 1.8 × 10 −4 s −1 with a confidence level of 68.3%. Conclusions:The upper limit determined from this experiment is consistent with most of the past measurements. Discrepancies between this experiment and past measurements can be explained by assuming past experiments misinterpreted the data.

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Section: Introductionmentioning

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Nuclear excitation by electronic transition ofU235

et al. 2016

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“…The NEET effect was studied in detail in 197 Au for which the energy misbalance between corresponding nuclear and atomic transitions was considered to be as small as 51 ± 2 eV. However, the experiment on NEET observation in 197 Au conducted at SPring-8 [22] has clearly indicated that the energy misbalance is even less 40 ± 2 eV.…”

Section: Range I -mentioning

confidence: 99%

Induced acceleration of the decay of the 31-yr isomer of 178m2 Hf using bremsstrahlung radiation

et al. 2015

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Induced triggering Electromagnetic transitionsBremsstrahlung radiation 178m2 Hf isomer triggering was studied using the new experimental setup developed at the Kharkiv National University and installed at the Kyiv Institute for Nuclear Research. The target presenting a single Ta foil of 300 μm thickness with the 178m2 Hf isomer activity of 100 Bq was irradiated by 30 keV electron beam. The enhanced counting rates of all strongest ground-state band (with the energies of 213, 325 and 426 keV) and 8 − -state band (with the energies of 216, 495 and 574 keV) transitions from the 178m2 Hf isomer decay were observed. Our data are consistent with the total triggering effect of 1.55 ± 0.12%. An estimate for the photon induced triggering cross-section gives a value which is close to the upper limit obtained in the earlier published works on the 178m2 Hf isomer triggering.

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“…The most recent and reliable experimental results on NEET have been performed on 197 Au [4,19], 189 Os [20,21] and 235 U [22]. The NEET probability for the 77.351 keV 197 Au nuclear transition that corresponds to an atomic K → M transition in neutral atoms was determined to be (5.0 ± 0.6) × 10 −8 [4].…”

Section: Introductionmentioning

confidence: 99%

Overlapping resonances in nuclei coupling to the atomic shells

Arigapudi

Pálffy

2012

Phys. Rev. A

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The resonant process of nuclear excitation by electron transition (NEET) in highly charged ions is investigated. In NEET, a bound electronic decay transition occurs with the simultaneous excitation of the nucleus, provided that the energies of the atomic and nuclear transition match. By varying the atomic charge state, the atomic transition energy can be tuned to a better match of the nuclear transition energy. We propose a new way to create the atomic hole in highly charged ions by dielectronic capture of a free electron. In order to derive the cross section for the three-step process composed by dielectronic capture, nuclear excitation by electron transition, and the subsequent nuclear decay, a Feshbach projection operator formalism is developed. With the help of this formalism, the resonances in nuclei coupling to the atomic shell and the possible interference between several direct and resonant electronic and nuclear processes such as radiative recombination, dielectronic recombination and nuclear excitation by electron capture are described.

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Nuclear excitation by electron transition onAu197by photoionization around theK−absorption edge

Cited by 27 publications

References 13 publications

Nuclear excitation by electronic transition ofU235

Nuclear excitation by electronic transition ofU235

Induced acceleration of the decay of the 31-yr isomer of 178m2 Hf using bremsstrahlung radiation

Overlapping resonances in nuclei coupling to the atomic shells

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