Test of the Brink-Axel Hypothesis for the Pygmy Dipole Resonance

Martin, D.; von Neumann-Cosel, P.; Tamii, A.; Aoi, N.; Bassauer, S.; Bertulani, C. A.; Carter, J.; Donaldson, L.; Fujita, H.; Fujita, Y.; Hashimoto, T.; Hatanaka, K.; Ito, T.; Krugmann, A.; Liu, B.; Maeda, Y.; Miki, K.; Neveling, R.; Pietralla, N.; Poltoratska, I.; Ponomarev, V. Yu.; Richter, A.; Shima, T.; Yamamoto, T.; Zweidinger, M.

doi:10.1103/PhysRevLett.119.182503

Title: Test of the Brink-Axel Hypothesis for the Pygmy Dipole Resonance

Publication Date:: Thu Nov 02 00:00:00 EDT 2017

Sponsoring Org.:: USDOE

OSTI Identifier:: 1406648

Grant/Contract Number:: FG02-08ER41533

Resource Type:: Publisher's Accepted Manuscript

Journal Name:: Physical Review Letters

Additional Journal Information:: Journal Name: Physical Review Letters Journal Volume: 119 Journal Issue: 18; Journal ID: ISSN 0031-9007

Publisher:: American Physical Society

Country of Publication:: United States

Language:: English

Citation Formats


                    Martin, D., von Neumann-Cosel, P., Tamii, A., Aoi, N., Bassauer, S., Bertulani, C. A., Carter, J., Donaldson, L., Fujita, H., Fujita, Y., Hashimoto, T., Hatanaka, K., Ito, T., Krugmann, A., Liu, B., Maeda, Y., Miki, K., Neveling, R., Pietralla, N., Poltoratska, I., Ponomarev, V. Yu., Richter, A., Shima, T., Yamamoto, T., and Zweidinger, M. Test of the Brink-Axel Hypothesis for the Pygmy Dipole Resonance.  United States: N. p., 2017. 
Web.  doi:10.1103/PhysRevLett.119.182503.

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                    Martin, D., von Neumann-Cosel, P., Tamii, A., Aoi, N., Bassauer, S., Bertulani, C. A., Carter, J., Donaldson, L., Fujita, H., Fujita, Y., Hashimoto, T., Hatanaka, K., Ito, T., Krugmann, A., Liu, B., Maeda, Y., Miki, K., Neveling, R., Pietralla, N., Poltoratska, I., Ponomarev, V. Yu., Richter, A., Shima, T., Yamamoto, T., & Zweidinger, M. Test of the Brink-Axel Hypothesis for the Pygmy Dipole Resonance.  United States.  https://doi.org/10.1103/PhysRevLett.119.182503

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                    Martin, D., von Neumann-Cosel, P., Tamii, A., Aoi, N., Bassauer, S., Bertulani, C. A., Carter, J., Donaldson, L., Fujita, H., Fujita, Y., Hashimoto, T., Hatanaka, K., Ito, T., Krugmann, A., Liu, B., Maeda, Y., Miki, K., Neveling, R., Pietralla, N., Poltoratska, I., Ponomarev, V. Yu., Richter, A., Shima, T., Yamamoto, T., and Zweidinger, M. Thu .  
"Test of the Brink-Axel Hypothesis for the Pygmy Dipole Resonance".  United States.  https://doi.org/10.1103/PhysRevLett.119.182503.

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@article{osti_1406648,

  title        = {Test of the Brink-Axel Hypothesis for the Pygmy Dipole Resonance},

  author       = {Martin, D. and von Neumann-Cosel, P. and Tamii, A. and Aoi, N. and Bassauer, S. and Bertulani, C. A. and Carter, J. and Donaldson, L. and Fujita, H. and Fujita, Y. and Hashimoto, T. and Hatanaka, K. and Ito, T. and Krugmann, A. and Liu, B. and Maeda, Y. and Miki, K. and Neveling, R. and Pietralla, N. and Poltoratska, I. and Ponomarev, V. Yu. and Richter, A. and Shima, T. and Yamamoto, T. and Zweidinger, M.},

  abstractNote = {},

  doi          = {10.1103/PhysRevLett.119.182503},

  journal      = {Physical Review Letters},

  number       = 18,

  volume       = 119,

  place        = {United States},

  year         = {Thu Nov 02 00:00:00 EDT 2017},

  month        = {Thu Nov 02 00:00:00 EDT 2017}

}

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Test of the Brink-Axel Hypothesis for the Pygmy Dipole Resonance

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Not provided.
https://doi.org/10.1103/physrevlett.119.182503
Most theoretical approaches used in nuclear astrophysics to model the nucleosynthesis of heavy elements incorporate the so-called statistical model in order to describe the excitation and decay properties of atomic nuclei. One of the basic assumptions of this model is the validity of the Brink–Axel hypothesis and the related concept of so-called photon strength functions to describe γ-ray transition probabilities. We present a novel experimental approach that allows for the first time to experimentally determine the photon strength function simultaneously in two independent ways by a unique combination of quasi-monochromatic photon beams and a newly implemented γ–γ coincidence setup. This technique does not assume a priori the validity of the Brink–Axel hypothesis and sets a benchmark in terms of the detection sensitivity for measuring decay properties of photo-excited states below the neutron separation energy. The data for the spherical off-shell nucleus ¹²⁸Te were obtained for γ-ray beam-energy settings between 3 MeV and 9 MeV in steps of 130 keV for the lower beam energies and in steps of up to 280 keV for the highest beam settings. We present a quantitative analysis on the consistency of the derived photon strength function with the Brink–Axel hypothesis. The data clearly demonstrate a discrepancy of up to a factor of two between the photon strength functions extracted from the photoabsorption and photon emission process, respectively. In addition, we observe that the photon strength functions are not independent of the excitation energy, as usually assumed. Thus, we conclude, that the Brink–Axel hypothesis is not strictly fulfilled in the excitation-energy region below the neutron separation threshold (S_n = 8.78 MeV) for the studied case of ¹²⁸Te.

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Title: Test of the Brink-Axel Hypothesis for the Pygmy Dipole Resonance

Citation Formats

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Dipole polarizability of ${}^{120}{Sn}$ and nuclear energy density functionals
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Critical Reactions in Contemporary Nuclear Astrophysics
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Experimental energy-dependent nuclear spin distributions
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The decay pattern of the Pygmy Dipole Resonance of 140Ce
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Observation of Large Scissors Resonance Strength in Actinides
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Spin- and Parity-Resolved Level Densities from the Fine Structure of Giant Resonances
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A study of the photoneutron contribution to the giant dipole resonance in doubly even Mo isotopes
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Electric Dipole Ground-State Transition Width Strength Function and 7-Mev Photon Interactions
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Large-scale continuum random-phase approximation predictions of dipole strength for astrophysical applications
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Microscopic HFB + QRPA predictions of dipole strength for astrophysics applications
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Topical issue on nuclear symmetry energy
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Fine Structure of the Gamow-Teller Resonance in ${}^{90}{Nb}$ and Level Density of $1^{+}$ States
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Extraction of level density and γ strength function from primary γ spectra
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Magnetic spectrometer Grand Raiden
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ENDF/B-VII.1 Nuclear Data for Science and Technology: Cross Sections, Covariances, Fission Product Yields and Decay Data
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Radiative strength functions in ${}^{93 - 98}{Mo}$
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Low-energy electric dipole response in 120 Sn
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Measurement of high energy resolution inelastic proton scattering at and close to zero degrees
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Branching and Fragmentation of Dipole Strength in ${}^{181}{Ta}$ in the Region of the Scissors Mode
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Systematics of strength function sum rules
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Electromagnetic $M 1$ transition strengths from inelastic proton scattering: The cases of ${}^{48}{Ca}$ and ${}^{208}{Pb}$
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Electromagnetic processes in relativistic heavy ion collisions
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Erratum: Evidence for radiative coupling of the pygmy dipole resonance to excited states [Phys. Rev. C 86 , 051302(R) (2012)]
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Nuclear level density and the determination of thermonuclear rates for astrophysics
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Polarization transfer and spin correlation experiments in nuclear physics
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Low-energy tail of the giant dipole resonance in ${}^{98}{Mo}$ and ${}^{100}{Mo}$ deduced from photon-scattering experiments
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New magnetic dipole excitation mode studied in the heavy deformed nucleus 156Gd by inelastic electron scattering
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Magnetic dipole excitations in nuclei: Elementary modes of nucleonic motion
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The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
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