The photoresponse of stable nuclei below 10 MeV

Volz, S.; Tsoneva, N.; Babilon, M.; Elvers, M.; Hasper, J.; Herzberg, R.‐D.; Lenske, H.; Lindenberg, Kai; Savran, D.; Zilges, A.

doi:10.1016/j.nuclphysa.2006.08.012

Cited by 143 publications

(130 citation statements)

References 40 publications

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“…These experiments complement previous real-photon scattering experiments on both nuclei [14,18] and an additional 140 Ce(α, α γ) experiment [2]. In contrast to the observations in heavier nuclei, lowlying E1 excitations in the lighter nucleus 48 Ca show a state-to-state dependent isospin character.…”

Section: -P2supporting

confidence: 84%

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Study of the isospin character of 1^-states using hadronic probes at intermediate energies

Derya

Endres

Harakeh

et al. 2015

EPJ Web of Conferences

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Abstract. The complementary (γ, γ ) and (α, α γ) reactions were used to study the isospin properties of lowlying E1 excitations in the doubly-magic nucleus 48 Ca. In contrast to heavier nuclei, a state-to-state change in isospin character was revealed in 48 Ca and a dominant isoscalar excitation was found which is interpreted as an isoscalar oscillation. Recently, protons at 80 MeV were used as an additional hadronic probe in a p-γ coincidence experiment on 140 Ce for the first time. Results of the experiments on 48 Ca and first results of the 140 Ce will be presented in this contribution.

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Section: -P2supporting

confidence: 84%

“…2. Dipole transitions were identified via their groundstate transition energy in comparison with (γ, γ ) data [18,19]. Singles proton-scattering cross sections were determined on basis of this spectrum.…”

Section: Results Of the 140 Ce(p P γ) Experimentsmentioning

confidence: 99%

Study of the isospin character of 1^-states using hadronic probes at intermediate energies

Derya

Endres

Harakeh

et al. 2015

EPJ Web of Conferences

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“…This procedure is a direct continuation of the phenomenological refinement philosophy used in the first formulations of the ETFFS [3,47]. Because the self-consistent relativistic (Q)RPA calculations fit the experimental data well and because the subtraction procedure, in principle, provides the correct E 0 value, which is equal to the (Q)RPA E 0 value, the authors [7] obtained a fulfillment of the above-mentioned conditions if the energy interval is properly chosen, for example (10-22.5) MeV for Z = 50 nuclei or (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20)(21)(22)(23)(24)(25) MeV for N = 50 nuclei. However, together with a reasonable description of the GDR's width, PC gives an additional strength in the low-energy region (see Figs.…”

Section: A Methodsmentioning

confidence: 99%

“…[18,19,25] and references therein) and theoretical (see Refs. [5][6][7]21,[26][27][28] and references therein) studies.…”

Section: Introductionmentioning

confidence: 99%

Self-consistent calculations of the strength function and radiative neutron capture cross section for stable and unstable tin isotopes

Авдеенков

Goriely²,

Kamerdzhiev

et al. 2011

Phys. Rev. C

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The E1 strength function for 15 stable and unstable Sn even-even isotopes from A = 100 to A = 176 are calculated using a self-consistent microscopic theory which, in addition to the standard (quasiparticle) randomphase approximation [(Q)RPA] approach, takes into account phonon coupling and the single-particle continuum (by means of the discretization procedure) with a cutoff of 100 MeV. Our analysis shows two distinct regions for which the integral characteristics of both the giant and pygmy resonances behave rather differently. For neutron-rich nuclei, starting from 132 Sn, we obtain a giant E1 resonance which significantly deviates from the widely used systematics extrapolated from experimental data in the β-stability valley. We show that the inclusion of phonon coupling is necessary for a proper description of the low-energy pygmy resonances and the corresponding transition densities for A < 132 nuclei, while in the A > 132 region the influence of phonon coupling is significantly smaller. The radiative neutron capture cross sections leading to the stable 124 Sn and unstable 132 Sn and 150 Sn nuclei are calculated with both the (Q)RPA and the beyond-(Q)RPA strength functions and shown to be sensitive to both the predicted low-lying strength and the phonon-coupling contribution. The comparison with the widely used phenomenological generalized Lorentzian approach shows considerable differences both for the strength function and the radiative neutron capture cross section. In particular, for the neutron-rich 150 Sn, the reaction cross section is found to be increased by a factor greater than 20. We conclude that the present approach may provide a complete and coherent description of the γ -ray-strength function for astrophysics applications. In particular, such calculations are highly recommended for a reliable estimate of the electromagnetic properties of exotic nuclei.

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“…These states have been related to the oscillations of weakly bound neutrons from the surface region, known as neutron PDR (see Refs. [31,32,38,39,40] and Refs. therein).…”

Section: B Calculation Of Dipole Excitations In the N = 50 Isotonesmentioning

confidence: 99%

Pygmy dipole strength inZr90

et al. 2008

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The dipole response of the N = 50 nucleus 90 Zr was studied in photon-scattering experiments at the electron linear accelerator ELBE with bremsstrahlung produced at kinetic electron energies of 7.9, 9.0, and 13.2 MeV. We identified 189 levels up to an excitation energy of 12.9 MeV. Statistical methods were applied to estimate intensities of inelastic transitions and to correct the intensities of the ground-state transitions for their branching ratios. In this way we derived the photoabsorption cross section up to the neutron-separation energy. This cross section matches well the photoabsorption cross section obtained from (γ, n) data and thus provides information about the extension of the dipole-strength distribution toward energies below the neutron-separation energy. An enhancement of E1 strength has been found in the range of 6 MeV to 11 MeV. Calculations within the framework of the quasiparticle-phonon model ascribe this strength to a vibration of the excessive neutrons against the N = Z neutron-proton core, giving rise to a pygmy dipole resonance.

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The photoresponse of stable nuclei below 10 MeV

Cited by 143 publications

References 40 publications

Study of the isospin character of 1^-states using hadronic probes at intermediate energies

Study of the isospin character of 1^-states using hadronic probes at intermediate energies

Self-consistent calculations of the strength function and radiative neutron capture cross section for stable and unstable tin isotopes

Pygmy dipole strength inZr90

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The photoresponse of stable nuclei below 10 MeV

Cited by 143 publications

References 40 publications

Study of the isospin character of 1-states using hadronic probes at intermediate energies

Study of the isospin character of 1-states using hadronic probes at intermediate energies

Self-consistent calculations of the strength function and radiative neutron capture cross section for stable and unstable tin isotopes

Pygmy dipole strength inZr90

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Study of the isospin character of 1^-states using hadronic probes at intermediate energies

Study of the isospin character of 1^-states using hadronic probes at intermediate energies