<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>γ</mml:mi></mml:mrow></mml:math>-ray strength function for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Sn</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>116</mml:mn><mml:mo>,</mml:mo><mml:mn>117</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>with the pygmy dipole resonance balanced in the photoneutron and neutron capture channe

Utsunomiya, H.; Goriely, Stéphane; Kamata, Masaki; Kondo, Takeo; Itoh, Osamu; Akimune, H.; Yamagata, T.; Toyokawa, Hiroyuki; Lui, Y.‐W.; Hilaire, Stéphane; Koning, A. J.

doi:10.1103/physrevc.80.055806

Cited by 33 publications

(32 citation statements)

References 41 publications

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“…2, cross sections around the neutron threshold are rather well described by the D1M + QRPA model, although some deviations can be seen. The agreement around the neutron threshold is rather satisfactory and there is no reason to invoke the presence of extra low-lying strength from the present data, at least in the vicinity of the neutron threshold, as seen in some previous photodata [11,15,16,38]. In contrast, larger deviations are seen for the predictions obtained with the BSk7 + QRPA strength, in particular around 11 MeV, but also at lower energies in the 145,146 Nd cases.…”

Section: A Photoneutron Cross Sectionssupporting

confidence: 79%

“…The well-established γ -ray strength function (γ SF) method can be used for constraining the (n,γ ) cross sections for radioactive nuclei [11,12]. Relying on the Brink hypothesis [13] linking the photo-deexcitation process to photoabsorption, the method determines the γ SF which commonly quantifies radiative neutron capture and photoneutron cross sections.…”

Section: Introductionmentioning

confidence: 99%

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Photoneutron cross sections for neodymium isotopes: Toward a unified understanding of(γ,n)and(n,γ)reactions in the rare earth region

et al. 2015

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Photoneutron cross sections were measured for five stable Nd isotopes, 143,144,145,146,148 Nd, near neutron threshold with highly monochromatic laser-Compton scattering γ rays. The photoneutron data were compared with the calculations performed with the TALYS reaction code with inputs of the Skyrme Hartree-Fock-Bogoliubov (HFB) plus quasi-particle random phase approximation (QRPA) model and the axially symmetric deformed Gogny HFB plus QRPA model of E1 γ -ray strength. Using the γ -ray strength function constrained by the present photoneutron data, a thorough analysis of the reverse (n,γ ) cross sections is made. Radiative neutron capture cross sections for an s-process branching-point nucleus in the rare earth region, 147 Nd with the half-life 10.98 d, are deduced with the γ -ray strength function method. The impact of the newly evaluated 147 Nd(n,γ ) 148 Nd cross section on s-process nucleosynthesis is discussed.

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Section: A Photoneutron Cross Sectionssupporting

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Photoneutron cross sections for neodymium isotopes: Toward a unified understanding of(γ,n)and(n,γ)reactions in the rare earth region

et al. 2015

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“…A vast body of experimental information about the radiative strength function in the energy region of the pygmy dipole resonance is available [50][51][52]. The so-called "Oslo method," which makes it possible to measure the radiative strength function over a broad energy interval starting from 1 or 2 MeV, is one of the modern methods for obtaining this function.…”

Section: Radiative Strength Function: Effects Of Coupling To Phononsmentioning

confidence: 99%

On some problems in describing and employing radiative strength functions

2014

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Problems that are associated with the description of radiative processes in low-energy physics for nuclear data and which can be solved within modern microscopic theory of the nucleus are discussed. This discussion concerns recent results in the theory of the pygmy dipole resonance and of the radiative strength function and the status of the Axel-Brink hypothesis. It is confirmed that coupling to phonon degrees of freedom must be taken into account in order to explain this resonance and the radiative strength function. By using the self-consistent generalized theory of finite Fermi systems, in which this coupling is taken into account, the pygmy dipole resonance is calculated for the 68 Ni and 116 Sn nuclei, and agreement with recent experimental data is obtained for the mean energy and for a 5% exhaustion of the sum rule for 68 Ni. For the example of the 68 Ni and 116 Sn nuclei, the E1 radiative strength functions are calculated for the first time with allowance for coupling to phonons, and the microscopic cross sections for total E1 photoabsorption that were obtained within the self-consistent generalized theory of finite Fermi systems are employed in these calculations.

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“…Total photoneutron cross sections were deduced at the average γ -ray energies with the Taylor expansion method [19]. The systematic uncertainty for the cross section is ±4.4% which represents a quadratic sum of uncertainties of the neutron detection efficiency (3.2%) and the number of incident γ rays (3%).…”

Section: Methodsmentioning

confidence: 99%

Total and partial photoneutron cross sections for Pb isotopes

et al. 2012

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Using quasimonochromatic laser-Compton scattering γ rays, total photoneutron cross sections were measured for 206, 207, 208 Pb near neutron threshold with a high-efficiency 4π neutron detector. Partial E1 and M1 photoneutron cross sections along with total cross sections were determined for 207, 208 Pb at four energies near threshold by measuring anisotropies in photoneutron emission with linearly polarized γ rays. The E1 strength dominates over the M1 strength in the neutron channel where E1 photoneutron cross sections show extra strength of the pygmy dipole resonance in 207, 208 Pb near the neutron threshold corresponding to 0.32%-0.42% of the Thomas-Reiche-Kuhn sum rule. Several μ 2 N units of B(M1) ↑ strength were observed in 207, 208 Pb just above neutron threshold, which correspond to an M1 cross section less than 10% of the total photoneutron cross section.

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γ-ray strength function forSn116,117with the pygmy dipole resonance balanced in the photoneutron and neutron capture channe

Cited by 33 publications

References 41 publications

Photoneutron cross sections for neodymium isotopes: Toward a unified understanding of(γ,n)and(n,γ)reactions in the rare earth region

Photoneutron cross sections for neodymium isotopes: Toward a unified understanding of(γ,n)and(n,γ)reactions in the rare earth region

On some problems in describing and employing radiative strength functions

Total and partial photoneutron cross sections for Pb isotopes

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