Resolved dipole strength below the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>E</mml:mi><mml:mn>1</mml:mn><mml:mn /></mml:math>giant resonance in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>138</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi></mml:math>

Herzberg, R.‐D.; Fransen, C.; Brentano, P. von; Eberth, J.; Enders, J.; Fitzler, A.; Käubler, L.; Kaiser, H.; Neumann‐Cosel, P. von; Pietralla, N.; Ponomarev, V. Yu.; Prade, H.; Richter, A.; Schnare, H.; Schwengner, R.; Skoda, S.; Thomas, H. G.; Tiesler, H.; Weißhaar, D.; Wiedenhöver, I.

doi:10.1103/physrevc.60.051307

Cited by 69 publications

(26 citation statements)

References 43 publications

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“…The QPM calculations of the fine structure of the PDR in the N=82 isotones in this paper extend previous calculations in 138 Ba [40] and 140 Ce [8] which together with Ref. [9] were the first theoretical studies on the topic.…”

Section: Qpm Calculationssupporting

confidence: 83%

Fragmentation and systematics of the pygmy dipole resonance in the stableN=82isotones

et al. 2011

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The low-lying electric dipole (E1) strength in the semi-magic nucleus 136 Xe has been measured which finalizes the systematic survey to investigate the so-called pygmy dipole resonance (PDR) in all stable even N=82 isotones with the method of nuclear resonance fluorescence using real photons in the entrance channel. In all cases, a fragmented resonance-like structure of E1 strength is observed in the energy region 5 MeV to 8 MeV. An analysis of the fragmentation of the strength reveals that the degree of fragmentation decreases towards the proton-deficient isotones while the total integrated strength increases indicating a dependence of the total strength on the neutron-to-proton ratio. The experimental results are compared to microscopic calculations within the quasi-particle phonon model (QPM). The calculation includes complex configurations of up to three phonons and is able to reproduce also the fragmentation of the E1 strength which allows to draw conclusions on the damping of the PDR. Calculations and experimental data are in good agreement in the degree of fragmentation and also in the integrated strength if the sensitivity limit of the experiments is taken into account.

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Section: Qpm Calculationssupporting

confidence: 83%

Fragmentation and systematics of the pygmy dipole resonance in the stableN=82isotones

et al. 2011

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“…A calculation of the integrated cross section alone from data taken at two different endpoint energies may give compelling evidence that a transition is to the 2 + 1 state. For example, the ratios of cross sections for the 4160.7 keV γ-ray I(E 0 = 7 MeV)/I(E 0 = 9 MeV) and I(E 0 = 5 MeV)/I(E 0 = 7 MeV) were found to be 0.68 (15) and 0.53 (9), respectively, assuming a dipole ground-state transition, while 0.67(13) and 1.1 (2) are obtained assuming a dipole transition to the 2 + 1 state from the J = 1, 4720.0 keV state.…”

Section: Experimental Details and Analysismentioning

confidence: 99%

“…Earlier works reported enhancements of dipole strength at low energy in 140 Ce and 138 Ba [1,2], and the term pygmy dipole resonance (PDR) was used to describe the phenomenon. The states observed in 138 Ba were soon unambiguously assigned J π = 1 − through polarized photon scattering experiments [3].…”

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confidence: 99%

Photoresponse of76Se below 9 MeV

Cooper¹,

Reichel²,

Werner³

et al. 2012

Phys. Rev. C

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The dipole strength distribution of 76 Se has been investigated via photon scattering in the energy region below 9 MeV utilizing bremsstrahlung produced at the S-DALINAC facility at the TU Darmstadt. About 0.20(1)% of the classical E1 sum rule is exhausted by observed J = 1 states of justifiably assumed negative parity. An extrapolation of the GDR below 9 MeV suggests that considerable strength may remain unobserved due to background, finite detector resolution, and fragmentation. The observed strength thus represents a lower limit. Candidates for the 2 + 1,ms state and a fragment of the 1 + sc mixed-symmetry states are presented.

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“…[7]. In addition various experiments have detected a concentration of E1 strength below the threshold [8][9][10][11][12][13][14]. However, a systematic study on the variation of the mode with the N͞Z ratio is still missing.…”

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confidence: 93%

Measurement of the Dipole and Electric Quadrupole Strength Distributions up to 10 MeV in the Doubly Magic Nuclei40Caand48Ca

et al. 2000

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The doubly magic nuclei 40Ca and 48Ca have been studied in high resolution photon scattering experiments. We have derived absolute dipole and quadrupole excitation strengths up to 10 MeV. Evidence was found for a two-phonon quadrupole-octupole state in 48Ca. At higher energies in contrast to 40Ca, a concentration of dipole strength is observed in 48Ca which is discussed in terms of a pygmy resonance originating from the large neutron excess.

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Resolved dipole strength below theE1giant resonance in138Ba

Cited by 69 publications

References 43 publications

Fragmentation and systematics of the pygmy dipole resonance in the stableN=82isotones

Fragmentation and systematics of the pygmy dipole resonance in the stableN=82isotones

Photoresponse of76Se below 9 MeV

Measurement of the Dipole and Electric Quadrupole Strength Distributions up to 10 MeV in the Doubly Magic Nuclei40Caand48Ca

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