Systematics of magnetic dipole strength in the stable even-mass Mo isotopes

Rusev, G.; Schwengner, R.; Dönau, F.; Erhard, M.; Frauendorf, S.; Grosse, E.; Junghans, A. R.; Käubler, L.; Kosev, K.; Kostov, L.K.; Mallion, S.; Schilling, K. D.; Wagner, A.; Garrel, H. von; Kneißl, U.; Kohstall, C.; Kreutz, M.; Pitz, H. H.; Scheck, M.; Stedile, F.; Brentano, P. von; Fransen, C.; Jolie, J.; Linnemann, A.; Pietralla, N.; Werner, V.

doi:10.1103/physrevc.73.044308

Cited by 47 publications

(36 citation statements)

References 49 publications

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“…As shown in Sec. III the level density predicted by the BSFG model at low excitation energy is consistent with experimental values deduced from our previous experiments [25]. Taking into account that there is no excited level below 735 keV in 98 Mo and 536 keV in 100 Mo one expects no feeding intensity in the energy range from the energy E x of an excited state down to the maximum energy of an inelastic transition, i.e., E x minus the energy of the first excited state.…”

Section: -3supporting

confidence: 90%

“…The contribution of the M1 excitations to → f 1 (E γ ) is typically by one order of magnitude smaller than the E1 contribution and it is frequently not taken into account [22][23][24]. From previous experiments information about M1 strengths was obtained from discrete transitions [25] in reasonable agreement with calculations within a quasiparticle random-phase approximation (QRPA) in a deformed basis, which confirm the relative weakness of M1 strength [25].…”

Section: B Dipole Strength Functionmentioning

confidence: 53%

“…[35,36]. The strength function for M1 transitions was taken from QRPA calculations in a deformed basis for the stable even-mass Mo isotopes [25]. The QRPA calculations reproduce the scissors mode and the spin-flip M1 resonance in the Mo isotopes but with a strength smaller than the measured one.…”

Section: -3mentioning

confidence: 99%

“…Ratios of I s obtained from the measurements at E kin e = 13.2 MeV and at E kin e = 3.8 MeV [25] are shown in the top panel of Fig. 10.…”

Section: A Dipole Strength Observed In Resolved Peaksmentioning

confidence: 99%

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Low-energy tail of the giant dipole resonance inMo98andMo100

et al. 2008

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Dipole-strength distributions in the nuclides 98 Mo and 100 Mo up to the neutron-separation energies have been studied in photon-scattering experiments at the bremsstrahlung facility of the Forschungszentrum Dresden-Rossendorf. To determine the dipole-strength distributions up to the neutron-emission thresholds, statistical methods were developed for the analysis of the measured spectra. The measured spectra of scattered photons were corrected for detector response and atomic background by simulations using the code GEANT3. Simulations of γ -ray cascades were performed to correct the intensities of the transitions to the ground state for feeding from higher-lying levels and to determine their branching ratios. The photoabsorption cross sections obtained for 98 Mo and 100 Mo from the present (γ, γ ) experiments are combined with (γ, n) data from literature, resulting in a photoabsorption cross section covering the range from 4 to about 15 MeV of interest for network calculations in nuclear astrophysics. Novel information about the low-energy tail of the giant dipole resonance and its energy dependence is derived. The photoabsorption cross sections deduced from the present photon-scattering experiments are compared with existing data from neutron capture and 3 He-induced reactions.

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Section: -3supporting

confidence: 90%

Section: B Dipole Strength Functionmentioning

confidence: 53%

Section: -3mentioning

confidence: 99%

“…Ratios of I s obtained from the measurements at E kin e = 13.2 MeV and at E kin e = 3.8 MeV [25] are shown in the top panel of Fig. 10.…”

Section: A Dipole Strength Observed In Resolved Peaksmentioning

confidence: 99%

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Low-energy tail of the giant dipole resonance inMo98andMo100

et al. 2008

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“…This approach was extensively used to interpret our measured low-energy dipole strength distributions in mass A = 90 − 100 nuclides with spherical as well as deformed equilibrium shapes [7,9,10,45]. In this work, we apply a recent extension of the standard QRPA called ISS, which accounts for possible shape fluctuations in the ground state that may change the dipole strength distributions.…”

Section: Iss-qrpa Calculationsmentioning

confidence: 99%

Dipole strength inLa139below the neutron-separation energy

et al. 2010

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The γ -ray strength function is an important input quantity for the determination of the photoreaction rate and the neutron capture rate for astrophysics as well as for nuclear technologies. To test model predictions, the photoabsorption cross section of 139 La up to the neutron-separation energy was measured using bremsstrahlung produced at the electron accelerator ELBE of Forschungszentrum Dresden-Rossendorf with an electron beam of 11.5 MeV kinetic energy. The experimental data were analyzed by applying Monte Carlo simulations of γ -ray cascades to obtain the intensities of the ground-state transitions and their branching ratios. We found a significant enhancement of electric dipole strength in the energy range from 6 to 10 MeV that may be related with a pygmy dipole resonance. The present data are combined with photoneutron cross sections for 139 La and compared with results of calculations on the basis of a quasiparticle-random-phase approximation using an instantaneous-shape sampling.

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The Nuclear Resonance Fluorescence Method

Kneißl

Zilges²

2012

Landolt-Börnstein - Group I Elementary Particles, Nuclei and Atoms

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Systematics of magnetic dipole strength in the stable even-mass Mo isotopes

Cited by 47 publications

References 49 publications

Low-energy tail of the giant dipole resonance inMo98andMo100

Low-energy tail of the giant dipole resonance inMo98andMo100

Dipole strength inLa139below the neutron-separation energy

The Nuclear Resonance Fluorescence Method

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