Quasicontinuum 
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 decay of 
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: Benchmarking indirect (
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Guttormsen, M.; Goriely, S.; Larsen, A. C.; Görgen, A.; Hagen, T. W.; Renstrøm, T.; Siem, S.; Syed, N. U. H.; Tagliente, G.; Toft, H. K.; Utsunomiya, H.; Voinov, A.; Wikan, K.

doi:10.1103/physrevc.96.024313

Cited by 26 publications

(18 citation statements)

References 58 publications

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“…This technique is based on the one in Ref. [38] and will be presented thoroughly in a forthcoming article [41]. The resulting unfolded matrix is shown in Fig.…”

Section: Experimental Details and Data Analysismentioning

confidence: 99%

Enhanced low-energy γ-decay strength of Ni70 and its robustness within the shell model

et al. 2018

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Neutron-capture reactions on very neutron-rich nuclei are essential for heavy-element nucleosynthesis through the rapid neutron-capture process, now shown to take place in neutron-star merger events. For these exotic nuclei, radiative neutron capture is extremely sensitive to their γ-emission probability at very low γ energies. In this work, we present measurements of the γ-decay strength of 70 Ni over the wide range 1.3 ≤ E γ ≤ 8 MeV. A significant enhancement is found in the γ-decay strength for transitions with E γ < 3 MeV. At present, this is the most neutron-rich nucleus displaying this feature, proving that this phenomenon is not restricted to stable nuclei. We have performed E1-strength calculations within the quasiparticle time-blocking approximation, which describe our data above E γ 5 MeV very well. Moreover, large-scale shell-model calculations indicate an M1 nature of the low-energy γ strength. This turns out to be remarkably robust with respect to the choice of interaction, truncation and model space, and we predict its presence in the whole isotopic chain, in particular the neutron-rich 72,74,76 Ni.

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“…This technique is based on the one in Ref. [38] and will be presented thoroughly in a forthcoming article [41]. The resulting unfolded matrix is shown in Fig.…”

Section: Experimental Details and Data Analysismentioning

confidence: 99%

Enhanced low-energy γ-decay strength of Ni70 and its robustness within the shell model

et al. 2018

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“…One experimental approach, the Oslo method [11], has been extensively used to measure the NLD and γ SF from particle-γ coincident data. NLDs and γ SFs obtained with the Oslo method have been shown to provide reliable neutron capture cross sections [12,13] and proton capture cross sections [14]. In recent years, the Oslo method has been extended to extract the γ SF and NLD following β decay [15].…”

Section: Introductionmentioning

confidence: 99%

First application of the Oslo method in inverse kinematics

et al. 2020

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The γ-ray strength function (γ SF) and nuclear level density (NLD) have been extracted for the first time from inverse kinematic reactions with the Oslo method. This novel technique allows measurements of these properties across a wide range of previously inaccessible nuclei. Proton-γ coincidence events from the d(86 Kr, pγ) 87 Kr reaction were measured at iThemba LABS and the γ SF and NLD in 87 Kr was obtained. The low-energy region of the γ SF is compared to shell-model calculations, which suggest this region to be dominated by M1 strength. The γ SF and NLD are used as input parameters to Hauser-Feshbach calculations to constrain (n, γ) cross sections of nuclei using the TALYS reaction code. These results are compared to 86 Kr(n, γ) data from direct measurements.

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“…[56]. The same procedure was applied in the analysis of 91,92 Zr isotopes [9]. This disentanglement was performed for the experimental strengths from each data set individually.…”

Section: γ-Ray Strength Functionmentioning

confidence: 99%

“…Cross sections from (γ , γ ) and (γ , x) reactions [53,62] were converted to γ SF data with Eq. (9). The resonances of 181 Ta for E γ < 9 MeV were fitted with standard Lorentzian functions, while for the components of the GEDR (purple dashed lines), the enhanced generalized Lorentzian functions were used, as shown in Fig.…”

Section: Scissors Resonancementioning

confidence: 99%

“…Hence, NLD and γ SF are nuclear properties of significance to nucleosynthesis [7] and calculations have shown that relative small changes to the overall shape of the γ SF, such as a pygmy resonance, can have an order-of-magnitude effect on the rate of elemental formation [8]. It has been shown that measured statistical properties can reliably be used to reproduce capture cross sections that were measured using other techniques [9][10][11], although further validations are needed across the nuclear chart. Additionally, NLD and γ SF can also be relevant to the design of existing and future nuclear power reactors, where simulations depend on such nuclear data [1].…”

Section: Introductionmentioning

confidence: 99%

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Nuclear level densities and γ -ray strength functions of Ta180,181,182

Brits¹,

Malatji²,

Wiedeking³

et al. 2019

Phys. Rev. C

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Particle-γ coincidence experiments were performed at the Oslo Cyclotron Laboratory with the 181 Ta(d, X) and 181 Ta(3 He, X) reactions to measure the nuclear level densities (NLDs) and γ-ray strength functions (γ SFs) of 180,181,182 Ta using the Oslo method. The back-shifted Fermi-gas, constant temperature plus Fermi gas, and Hartree-Fock-Bogoliubov plus combinatorial models were used for the absolute normalizations of the experimental NLDs at the neutron separation energies. The NLDs and γ SFs are used to calculate the corresponding 181 Ta(n, γ) cross sections and these are compared to results from other techniques. The energy region of the scissors resonance strength is investigated and from the data and comparison to prior work it is concluded that the scissors strength splits into two distinct parts. This splitting may allow for the determination of triaxiality and a γ deformation of 14.9 • ± 1.8 • was determined for 181 Ta.

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Quasicontinuum γ decay of Zr91,92 : Benchmarking indirect ( n,γ

Cited by 26 publications

References 58 publications

Enhanced low-energy γ-decay strength of Ni70 and its robustness within the shell model

Enhanced low-energy γ-decay strength of Ni70 and its robustness within the shell model

First application of the Oslo method in inverse kinematics

Nuclear level densities and γ -ray strength functions of Ta180,181,182

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