Dipole strength of Ta 181 for the evaluation of the Ta 180 stellar neutron capture rate

A. Makinaga; R. Massarczyk; R. Schwengner; M. Beard; F. Dönau; M. Anders; D. Bemmerer; R. Beyer; R. Hannaske; A. R. Junghans; M. Kempe; T. Kögler; M. Röder; K. Schmidt; A. Wagner

doi:10.1103/PhysRevC.90.044301

Dipole strength of Ta 181 for the evaluation of the Ta 180 stellar neutron capture rate

A. Makinaga, R. Massarczyk, R. Schwengner, M. Beard, F. Dönau, M. Anders, D. Bemmerer, R. Beyer, R. Hannaske, A. R. Junghans, M. Kempe, T. Kögler, M. Röder, K. Schmidt, A. Wagner

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Abstract

The photoabsorption cross section of Ta181 up to the neutron-separation energy is deduced using bremsstrahlung produced with an electron beam of 9.6 MeV energy. The analysis of the measured γ-ray spectra includes the quasicontinuum of levels at high energy. Simulations of γ-ray cascades are performed to estimate intensities of inelastic transitions and branching ratios of the ground-state transitions. The resulting photoabsorption cross section shows enhanced dipole strength in the energy range from 5 to 8 MeV, which may be related to a pygmy dipole resonance. The results of the present experiment are compared with predictions of a quasiparticle-random-phase approximation in a deformed basis. A combination of the present experimental data and (γ,n) data is used as an input to the statistical code talys applied to calculate cross sections and reaction rates of photonuclear reactions that are important for the nucleosynthesis of Ta180.

Original language	English
Article number	044301
Journal	Physical Review C - Nuclear Physics
Volume	90
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevC.90.044301
State	Published - 2 Oct 2014
Externally published	Yes

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Makinaga, A., Massarczyk, R., Schwengner, R., Beard, M., Dönau, F., Anders, M., Bemmerer, D., Beyer, R., Hannaske, R., Junghans, A. R., Kempe, M., Kögler, T., Röder, M., Schmidt, K., & Wagner, A. (2014). Dipole strength of Ta 181 for the evaluation of the Ta 180 stellar neutron capture rate. Physical Review C - Nuclear Physics, 90(4), Article 044301. https://doi.org/10.1103/PhysRevC.90.044301

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title = "Dipole strength of Ta 181 for the evaluation of the Ta 180 stellar neutron capture rate",

abstract = "The photoabsorption cross section of Ta181 up to the neutron-separation energy is deduced using bremsstrahlung produced with an electron beam of 9.6 MeV energy. The analysis of the measured γ-ray spectra includes the quasicontinuum of levels at high energy. Simulations of γ-ray cascades are performed to estimate intensities of inelastic transitions and branching ratios of the ground-state transitions. The resulting photoabsorption cross section shows enhanced dipole strength in the energy range from 5 to 8 MeV, which may be related to a pygmy dipole resonance. The results of the present experiment are compared with predictions of a quasiparticle-random-phase approximation in a deformed basis. A combination of the present experimental data and (γ,n) data is used as an input to the statistical code talys applied to calculate cross sections and reaction rates of photonuclear reactions that are important for the nucleosynthesis of Ta180.",

author = "A. Makinaga and R. Massarczyk and R. Schwengner and M. Beard and F. D{\"o}nau and M. Anders and D. Bemmerer and R. Beyer and R. Hannaske and Junghans, \{A. R.\} and M. Kempe and T. K{\"o}gler and M. R{\"o}der and K. Schmidt and A. Wagner",

note = "Publisher Copyright: {\textcopyright} 2014 American Physical Society.",

year = "2014",

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day = "2",

doi = "10.1103/PhysRevC.90.044301",

language = "英語",

volume = "90",

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publisher = "American Physical Society",

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Makinaga, A, Massarczyk, R, Schwengner, R, Beard, M, Dönau, F, Anders, M, Bemmerer, D, Beyer, R, Hannaske, R, Junghans, AR, Kempe, M, Kögler, T, Röder, M, Schmidt, K & Wagner, A 2014, 'Dipole strength of Ta 181 for the evaluation of the Ta 180 stellar neutron capture rate', Physical Review C - Nuclear Physics, vol. 90, no. 4, 044301. https://doi.org/10.1103/PhysRevC.90.044301

TY - JOUR

T1 - Dipole strength of Ta 181 for the evaluation of the Ta 180 stellar neutron capture rate

AU - Makinaga, A.

AU - Massarczyk, R.

AU - Schwengner, R.

AU - Beard, M.

AU - Dönau, F.

AU - Anders, M.

AU - Bemmerer, D.

AU - Beyer, R.

AU - Hannaske, R.

AU - Junghans, A. R.

AU - Kempe, M.

AU - Kögler, T.

AU - Röder, M.

AU - Schmidt, K.

AU - Wagner, A.

PY - 2014/10/2

Y1 - 2014/10/2

N2 - The photoabsorption cross section of Ta181 up to the neutron-separation energy is deduced using bremsstrahlung produced with an electron beam of 9.6 MeV energy. The analysis of the measured γ-ray spectra includes the quasicontinuum of levels at high energy. Simulations of γ-ray cascades are performed to estimate intensities of inelastic transitions and branching ratios of the ground-state transitions. The resulting photoabsorption cross section shows enhanced dipole strength in the energy range from 5 to 8 MeV, which may be related to a pygmy dipole resonance. The results of the present experiment are compared with predictions of a quasiparticle-random-phase approximation in a deformed basis. A combination of the present experimental data and (γ,n) data is used as an input to the statistical code talys applied to calculate cross sections and reaction rates of photonuclear reactions that are important for the nucleosynthesis of Ta180.

AB - The photoabsorption cross section of Ta181 up to the neutron-separation energy is deduced using bremsstrahlung produced with an electron beam of 9.6 MeV energy. The analysis of the measured γ-ray spectra includes the quasicontinuum of levels at high energy. Simulations of γ-ray cascades are performed to estimate intensities of inelastic transitions and branching ratios of the ground-state transitions. The resulting photoabsorption cross section shows enhanced dipole strength in the energy range from 5 to 8 MeV, which may be related to a pygmy dipole resonance. The results of the present experiment are compared with predictions of a quasiparticle-random-phase approximation in a deformed basis. A combination of the present experimental data and (γ,n) data is used as an input to the statistical code talys applied to calculate cross sections and reaction rates of photonuclear reactions that are important for the nucleosynthesis of Ta180.

UR - https://www.scopus.com/pages/publications/84907494090

U2 - 10.1103/PhysRevC.90.044301

DO - 10.1103/PhysRevC.90.044301

M3 - 記事

AN - SCOPUS:84907494090

SN - 0556-2813

VL - 90

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 4

M1 - 044301

ER -

Dipole strength of Ta 181 for the evaluation of the Ta 180 stellar neutron capture rate

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