Nonstatistical Cooling of the Highly Excited<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Dy</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>161</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>Nucleus

Guttormsen, M.; Rekstad, J.; Henriquez, A.; Ingebretsen, F.; Thorsteinsen, T.F.

doi:10.1103/physrevlett.52.102

Cited by 23 publications

(9 citation statements)

References 6 publications

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“…For deformed nuclei, Chen and Leander [5] predicted strong M1 transitions between ∆Ω = 1 Nilsson orbitals 1 originating from the same spherical state. These predictions were later supported by the observation of an enhancement at E γ ≈ 2.2 MeV in the γ spectra of the excited 161 Dy nucleus [6].…”

Section: Introductionmentioning

confidence: 70%

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Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes

et al. 2014

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The γ -ray strength function in the quasicontinuum has been measured for [231][232][233] 232,233 Pa, and 237-239 U using the Oslo method. All eight nuclei show a pronounced increase in γ strength at ω SR ≈ 2.4 MeV, which is interpreted as the low-energy M1 scissors resonance (SR). The total strength is found to be B SR = 9-11 μ 2 N when integrated over the 1-4 MeV γ -energy region. The SR displays a double-hump structure that is theoretically not understood. Our results are compared with data from (γ , γ ) experiments and theoretical sum-rule estimates for a nuclear rigid-body moment of inertia.

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Section: Introductionmentioning

confidence: 70%

“…[5][6][7] are summarized in TableIII. The two last columns of TableIIIshow the predicted sum-rule estimates.…”

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confidence: 99%

Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes

et al. 2014

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“…More specifically, the transitions correspond to Ω → Ω ± 1 transitions with similar spherical j-components in the Nilsson scheme. The energy splitting between these Nilsson orbitals is proportional to the nuclear deformation and is the reason for the higher and well-separated γ-energy centroid of 2 − 3 MeV [46]. For transitional nuclei with low deformation, we foresee an exciting situation where the upbend and the SR merge together in a new type of structure.…”

Section: Enhancement In the γSfmentioning

confidence: 96%

First observation of low-energyγ-ray enhancement in the rare-earth region

et al. 2016

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The γ-ray strength function and level density in the quasi-continuum of 151,153 Sm have been measured using BGO shielded Ge clover detectors of the STARLiTeR system. The Compton shields allow for an extraction of the γ strength down to unprecedentedly low γ energies of ≈ 500 keV. For the first time an enhanced lowenergy γ-ray strength has been observed in the rare-earth region. In addition, for the first time both the upbend and the well known scissors resonance have been observed simultaneously for the same nucleus. HauserFeshbach calculations show that this strength enhancement at low γ energies could have an impact of 2-3 orders of magnitude on the (n,γ) reaction rates for the r-process nucleosynthesis.

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“…The first experimental indication of the SR on excited states (quasi-continuum region), was the observation of a strong enhancement in the γ spectrum of excited 161 Dy at around 3 MeV in 1984 [9]. This structure was interpreted as an implication of the SR predicted to occur in deformed nuclei [10,11].…”

Section: Introductionmentioning

confidence: 98%

Verification of detailed balance for γ absorption and emission in Dy isotopes

et al. 2018

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The photo-neutron cross sections of 162,163 Dy have been measured for the first time in an energy region from the neutron threshold (S n ) up to ≈ 13 MeV. The (γ,n) reaction was induced with quasi-monochromatic laser Compton-scattered γ rays, produced at the NewSUBARU laboratory. The corresponding γ-ray strength functions (γSF) have been calculated from the photo-neutron cross sections. The data are compared to reanalyzed γSFs of 160−164 Dy, which are measured below S n . The excellent agreement with the photo-neutron data at S n confirms the principle of detailed balance. Thus, a complete γSF is established covering in total the energy region of 1 MeV ≤ E γ ≤ 13 MeV. These mid-shell well-deformed dysprosium isotopes all show scissors resonances with very similar structures. We find that our data predict the same integrated scissors strength as (γ, γ ) data when integrated over the same energy range, which shows that the scissors mode very likely is consistent with the generalized Brink hypothesis. Finally, using the γSFs as input in the reaction code TALYS, we have deduced radiative neutron-capture cross sections and compared them to direct measurements. We find a very good agreement within the uncertainties, which gives further support to the experimentally determined γSFs.

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Nonstatistical Cooling of the Highly ExcitedDy161Nucleus

Cited by 23 publications

References 6 publications

Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes

Scissors resonance in the quasicontinuum of Th, Pa, and U isotopes

First observation of low-energyγ-ray enhancement in the rare-earth region

Verification of detailed balance for γ absorption and emission in Dy isotopes

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