The giant dipole resonance in the transition region of the samarium isotopes

Carlos, P.; Beil, H.; Bergère, R.; Leprêtre, A.; Miniac, A. De; Veyssière, A.

doi:10.1016/0375-9474(74)90373-x

Cited by 120 publications

(104 citation statements)

References 28 publications

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“…The IVD strengths of the K = 0 and |K| = 1 modes split in 154 Sm due to the ground state deformation, whereas those are identical for spherical 144 Sm. In both cases, FAM-QRPA shows a good agreement with the experimental data [53]: the typical frequency and width of the GDR can be well reproduced with our model parameters, with the smearing width of = 1.0 MeV. The plateau distribution for the deformed 154 Sm can be understood as a product of the split between K = 0 and |K| = 1 modes [13,14].…”

Section: A Benchmark Calculationsupporting

confidence: 72%

Finite amplitude method applied to the giant dipole resonance in heavy rare-earth nuclei

2016

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Section: A Benchmark Calculationsupporting

confidence: 72%

Finite amplitude method applied to the giant dipole resonance in heavy rare-earth nuclei

2016

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“…The TLO parametrization is compared with photoneutron cross sections for Sm-isotopes measured using positron-annihilation in flight [17]. see Fig.…”

Section: Triple Lorentzian Parameterisation Of the Gdrmentioning

confidence: 99%

Breaking of axial symmetry in excited nuclei as identified in experimental data

2017

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Abstract.A phenomenological prediction for radiative neutron capture is presented and compared to recent compilations of Maxwellian averaged cross sections and average radiative widths. Photon strength functions and nuclear level densities near the neutron separation energy are extracted from data without the assumption of axial symmetry -at variance to common usage. A satisfactory description is reached with a small number of global parameters when theoretical predictions on triaxiality (from constrained HFB calculations with the Gogny D1S interaction) are inserted into conventional calculations of radiative neutron capture. The photon strength is parametrized using the sum of three Lorentzians (TLO) in accordance to the dipole sum rule. The positions and widths are accounted for by the droplet model with surface dissipation without locally adjusted parameters. Level densities are influenced strongly by the significant collective enhancement based on the breaking of axial symmetry. With the less stringent requirement of invariance against rotation by 180 • a global set of parameters which allows to describe the photon strength function and the level densities in the nuclear mass range from mass number 50 < A < 250 is found.

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“…For instance, the peak splitting of the giant dipole resonance (GDR), which is caused by the different frequencies of oscillation along the long and short axes, has been observed in experiments [4]. A typical example of the shape phase transition from spherical to deformed ground states and the evolution of deformation splitting in GDRs have been observed in Nd and Sm isotopes [2,3,4,5,6].…”

Section: Introductionmentioning

confidence: 99%