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Ardisson, C.; Dalmasso, J.; Ardisson, G.

doi:10.1103/physrevc.33.2132

Cited by 17 publications

(4 citation statements)

References 25 publications

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“…Figure 2 plots the calculated configurationconstrained PESs for two-quasiparticle K π = 6 − states in 232 Th, 234 U and 236 Pu, showing octupole deformations or octupole softness. Experiments have observed a K π = 6 − isomer at an excitation energy of 1.42 MeV with T 1/2 = 33.5 µs in 234U [40]. The experimental energy is reproduced by the present calculation giving E x = 1.26 MeV.…”

Section: Calculationssupporting

confidence: 73%

Multi-quasiparticle High-$K$ States and Their Rotations

Fang¹,

Fu²,

Liang³

et al. 2015

Acta Phys. Pol. B Proc. Suppl.

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Based on the Woods-Saxon potential, we have developed a configuration-constrained potential energy surface calculation. This method has been successfully applied to the calculations of various multi-quasiparticle high-K states in different mass regions, well reproducing the experimental excitation energies and other observations. Further, we have developed the configuration-constrained total Routhian surface calculation for the rotations of the multi-quasiparticle high-K states. The pairing calculation is improved by a particle-number-conserving pairing method which always gives converged solutions for the cranking Hartree-Fock pairing calculations. In this paper, we focus on the predictions of possible octupole deformed high-K states in the actinide mass region. Using the developed configuration-constrained total Routhian surface method, we have investigated high-K rotations for nuclei around Z = 100 and 102 with N ≈ 150.

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Section: Calculationssupporting

confidence: 73%

Multi-quasiparticle High-$K$ States and Their Rotations

Fang¹,

Fu²,

Liang³

et al. 2015

Acta Phys. Pol. B Proc. Suppl.

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“…It enabled the derivation of an extended level scheme of 234 U. In comparison with previous investigations in the actinide region, the high efficiency of the MINIBALL γ-ray spectrometer allowed the analysis of coincidence data, which was not feasible in a previous γ−ray measurement (Ardisson et al, 1986). The analysis of the coincidence data allows for several extensions and corrections of the known level scheme of 234 U.…”

Section: Spectroscopy Of 234 Umentioning

confidence: 98%

Spectroscopy of Actinide Nuclei – Perspectives with Position Sensitive HPGe Detectors

2014

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Recent advances in in-beam gamma-ray spectroscopy of actinide nuclei are based on highly efficient arrays of escape-suppressed spectrometers. The sensitivity of these detector arrays is greatly enhanced by the combination with powerful mass separators or particle detector systems. This technique is demonstrated by an experiment to investigate excited states in 234 U after the one-neutron-transfer reaction 235 U(d,t). In coincidence with the outgoing tritons, γ-rays were detected with the highly efficient MINIBALL spectrometer. In the near future an even enhanced sensitivity will be achieved by utilizing position sensitive HPGe detectors which will exploit the novel detection method of gamma-ray energy tracking in electrically segmented germanium detectors. An example for this novel approach is the investigation neutron-rich actinide Th and U nuclei after multi nucleon transfer reactions employing the AGATA demonstrator and PRISMA setup at LNL, Italy. A primary 136 Xe beam hitting a 238 U target was used to produce the nuclei of interest. Beam-like reaction products after neutron transfer were selected by the PRISMA spectrometer. Coincident γ-rays from excited states in beam and target like particles were measured with the position sensitive AGATA HPGe detectors. Improved Doppler correction and quality of the γ-spectra is based on the novel γ-ray tracking technique, which was successfully exploited in this region.

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“…There are smaller differences in the mean gamma energies, although within the uncertainties given for the JEF2.2 and JEFF3.11 evaluations and within 3σ for the ENSDF and DDEP evaluations. The DDEP evaluators [23] note that beta − decay scheme is based on a single measurement result [24] which includes 28 unplaced gamma rays, carrying about 3.2% of the total intensity. In addition there is inconsistency between the Q-value determined from evaluated beta − decay radiation and mass differences.…”

Section: M Pa and 234 Pamentioning

confidence: 99%

Review of nuclear data for naturally occurring radionuclides applied to environmental applications

2019

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Accurate nuclear data, commonly using evaluated libraries, is essential in many applications, allowing confidence in derived parameters. An approach to assess the confidence with which these data can be used is proposed, not previously reported, comparing nuclear data presented by different evaluations. Variations between evaluations are used as an indication of potential inaccuracies in the nuclear data or evaluation procedure, and the relevant primary literature reviewed more fully. Applying this approach to naturally occurring radionuclides has identified eight radionuclides where the evaluations differ significantly. Where recommended data are supported by a single set of high precision measurements, independent verification of those measurements will increase confidence in the accuracy of the data (214 Bi and 214 Pb). Further measurements should be conducted where the decay schemes are incomplete (228 Ac and 228 Ra). For 40 K, the mean beta energy in all the evaluations has been calculated using an incorrect shape factor, and log ft and branching ratios have been calculated using an inappropriate program. Precise measurements of beta spectra will allow the use of experimentally derived shape factors for the calculation of mean beta energies (40 K and 210 Bi). Parameters used for infinite matrix dose rate and geothermal heat production calculations have been derived for the data discussed here.

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U234excited states fed in theβdecay ofPa

Cited by 17 publications

References 25 publications

Multi-quasiparticle High-$K$ States and Their Rotations

Multi-quasiparticle High-$K$ States and Their Rotations

Spectroscopy of Actinide Nuclei – Perspectives with Position Sensitive HPGe Detectors

Review of nuclear data for naturally occurring radionuclides applied to environmental applications

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