<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 method and its application to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Pd</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>107</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>

Utsunomiya, H.; Goriely, Stéphane; Akimune, H.; Harada, Hideo; Kitatani, Fumito; Goko, S.; Toyokawa, Hiroyuki; Yamada, Ken‐ichi; Kondo, Takeo; Itoh, Osamu; Kamata, Masaki; Yamagata, T.; Lui, Y.‐W.; Daoutidis, Ioannis; Arteaga, Daniel; Hilaire, Stéphane; Koning, A. J.

doi:10.1103/physrevc.82.064610

Cited by 41 publications

(18 citation statements)

References 18 publications

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“…The GDR models were fitted to experimental (γ ,n) data from Ref. [34], and the resulting parameters are listed in Table IV. The temperatures, T , were taken as free, constant parameters in the fits.…”

Section: Gamma-ray Strength Functionsmentioning

confidence: 99%

Pygmy resonance and low-energy enhancement in theγ-ray strength functions of Pd isotopes

et al. 2014

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Background: An unexpected enhancement in the γ -ray strength function, as compared to the low-energy tail of the giant dipole resonance (GDR), has been observed for Sc, Ti, V, Fe, and Mo isotopes for E γ < 4 MeV. This enhancement was not observed in subsequent analyses on Sn isotopes, but a pygmy dipole resonance (PDR) centered at E γ ≈ 8 MeV was however detected. The γ -ray strength functions measured for Cd isotopes exhibit both features over the range of isotopes, with the low-energy enhancement decreasing and PDR strength increasing as a function of neutron number. This suggests a transitional region for the onset of low-energy enhancement, and also that the PDR strength depends on the number of neutrons. Purpose: The γ -ray strength functions of 105-108 Pd have been measured in order to further explore the proposed transitional region. Method: Experimental data were obtained at the Oslo Cyclotron Laboratory by using the charged particle reactions ( 3 He, 3 He γ ) and ( 3 He, αγ ) on 106,108 Pd target foils. Particle-γ coincidence measurements provided information on initial excitation energies and the corresponding γ -ray spectra, which were used to extract the level densities and γ -ray strength functions according to the Oslo method. Results: The γ -ray strength functions indicate a sudden increase in magnitude for E γ > 4 MeV, which is interpreted as a PDR centered at E γ ≈ 8 MeV. An enhanced γ -ray strength at low energies is also observed for 105 Pd, which is the lightest isotope measured in this work. Conclusions: A PDR is clearly identified in the γ -ray strength functions of 105-108 Pd, and a low-energy enhancement is observed for 105 Pd. Further, the results correspond and agree very well with the observations from the Cd isotopes, and support the suggested transitional region for the onset of low-energy enhancement with decreasing mass number. The neutron number dependency of the PDR strength is also evident.

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Section: Gamma-ray Strength Functionsmentioning

confidence: 99%

Pygmy resonance and low-energy enhancement in theγ-ray strength functions of Pd isotopes

et al. 2014

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“…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%

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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“…The PDR and M1 resonance constitute extra components of a nuclear statistical quantity, the γ -ray strength function [1], and enhance radiative neutron capture cross sections. Thus, these resonances play a unique role in the γ -ray strength function method [2][3][4] which is an indirect experimental method of determining radiative neutron capture cross sections for unstable nuclei. 208 Pb is a well-studied nucleus for which both E1 and M1 strengths were investigated in the neutron as well as γ channels.…”

Section: Introductionmentioning

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 method and its application toPd107

Cited by 41 publications

References 18 publications

Pygmy resonance and low-energy enhancement in theγ-ray strength functions of Pd isotopes

Pygmy resonance and low-energy enhancement in theγ-ray strength functions of Pd isotopes

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

Total and partial photoneutron cross sections for Pb isotopes

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