Search for decay of the 3.5-eV level in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>229</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Th</mml:mi></mml:math>

Browne, E.; Norman, E. B.; Canaan, R.D.; Glasgow, David; Keller, Jaime; Young, J. P.

doi:10.1103/physrevc.64.014311

Cited by 28 publications

(22 citation statements)

References 18 publications

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“…III, the chemical environment can significantly affect the half-life of the isomeric state [3]. It most likely explains why, given the currently accepted value for the isomeric transition energy, that many previous experiments performed in powders, solids and solutions produced null results [52][53][54][55][56]; similarly, non-VUV sensitive measurements could have been affected by internal conversion [57,58]. The internal conversion process could also have strong implications for the experiments reported in Refs.…”

Section: Importance Of the Electronic Conversion Decay Channelmentioning

confidence: 99%

Radiative lifetime and energy of the low-energy isomeric level inTh229

et al. 2015

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We estimate the range of the radiative lifetime and energy of the anomalous, low-energy 3/2 + (7.8± 0.5 eV) state in the 229 Th nucleus. Our phenomenological calculations are based on the available experimental data for the intensities of M 1 and E2 transitions between excited levels of the 229 Th nucleus in the K π [N nZ Λ] = 5/2 + [633] and 3/2 + [631] rotational bands. We also discuss the influence of certain branching coefficients, which affect the currently accepted measured energy of the isomeric state. From this work, we establish a favored region where the transition lifetime and energy should lie at roughly the 90% confidence level. We also suggest new nuclear physics measurements, which would significantly reduce the ambiguity in the present data.

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Section: Importance Of the Electronic Conversion Decay Channelmentioning

confidence: 99%

Radiative lifetime and energy of the low-energy isomeric level inTh229

et al. 2015

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“…Earlier, two groups attempted to determine this half-life using radiochemical and α-spectroscopy techniques. Browne et al [6] The energy distance between the contour lines is equal to 0.25 MeV. 229 Th m half-life must be either shorter than 6 h or longer than 20 days.…”

Section: Half-life Of the Low-energy 3/2 + Isomermentioning

confidence: 99%

“…Consequently, the lowest excited state in 229 Th presents a unique opportunity to investigate interactions between nuclear and atomic degrees of freedom and has been the main subject of several works in the past few years (e.g. [4][5][6][7] and references quoted therein). Although a direct observation of this state has not yet been possible, an estimate of its properties can be obtained by extrapolation from properties of the higher lying levels in 229 Th.…”

Section: Introductionmentioning

confidence: 99%

Nuclear structure ofTh229

Ruchowska

Cederkäll

2006

Phys. Rev. C

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Lifetimes of excited states in 229 Th, populated in the β decay of 229 Ac, have been measured using the advanced time-delayed βγ γ (t) method. Half-lives of 14 states have been determined including 11 of them for the first time. Twenty-seven new γ lines have been introduced into the β-decay scheme of 229 Ac based on results of γ γ coincidence measurements. Reduced transition probabilities have been determined for more than 70 γ transitions in 229 Th. Average |D 0 | values of 0.029(1), 0.077(3), and 0.024(5) e fm have been deduced for the lowest K π = 1/2 ± , 3/2 ± , and 5/2 ± parity partner bands, respectively. Excited states in 229 Th and experimental transition rates have been interpreted within the quasiparticle-plus-phonon model. The half-life of the 3.5-eV, 3/2 + isomeric state is predicted to be about 10 h. Potential energy surfaces on the (β 2 , β 3 ) plane for the lowest single quasiparticle configurations in 229 Th have been calculated using the Strutinsky method.

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“…It is hard to predict quantitatively T 1=2 and the partial widths for isomer decay. Alpha decay measurements 14) indicate that if the isomer exist, its half-life must be T 1=2 6 h or T 1=2 ! 20 d. A theoretical estimation for M1 photon emission depends on the nucleus-electron interaction and isomeric state energy.…”

Section: Autoionization Statesmentioning

confidence: 99%

“…12) Up to now, there is no direct evidence with sufficient statistics [11][12][13][14][15][16][17] for the identification of 229m Th. Ionization potential (IP) for Th is 6.08 eV.…”

Section: Autoionization Statesmentioning

confidence: 99%

Role of Autoionization States in Nuclear Excitation and Triggering by an Electron Transition (NEET)

Izosimov¹

2008

Journal of Nuclear Science and Technology

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Nuclear excitation and nuclear isomers triggering by an electron transition (NEET) via decay of autoionization states (AS) in electron shells are considered. It is shown that using of AS for NEET allows one to compensate for the differences in energy and multipolarity of the nuclear transition and transition in the electron shell. The possibilities of NEET via AS for triggering the nuclear isomer decay are discussed.

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Search for decay of the 3.5-eV level in229Th

Cited by 28 publications

References 18 publications

Radiative lifetime and energy of the low-energy isomeric level inTh229

Radiative lifetime and energy of the low-energy isomeric level inTh229

Nuclear structure ofTh229

Role of Autoionization States in Nuclear Excitation and Triggering by an Electron Transition (NEET)

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