Study of photo-proton reactions driven by bremsstrahlung radiation of high-intensity laser generated electrons

K.M. Spohr, M. Shaw, W. Galster, K.W.D. Ledingham, L. Robson, J.M. Yang, P. McKenna, T. McCanny, J.J. Melone, K.U. Amthor, F. Ewald, B. Liesfeld, H. Schwoerer, R. Sauerbrey

Research output: Contribution to journalArticle

Abstract

Photo-nuclear reactions were investigated using a high power table-top laser. The laser system at the University of Jena (I ~ 3–5×1019 W cm-2) produced hard bremsstrahlung photons (kT~2.9 MeV) via a laser–gas interaction which served to induce (γ, p) and (γ, n) reactions in Mg, Ti, Zn and Mo isotopes. Several (γ, p) decay channels were identified using nuclear activation analysis to determine their integral reaction yields. As the laser-generated bremsstrahlung spectra stretches over the energy regime dominated by the giant dipole resonance (GDR), these yield measurements were used in conjunction with theoretical estimates of the resonance energies Eres and their widths Γres to derive the integral reaction cross-section σint(γ,p) for 25Mn, 48, 49Ti, 68Zn and 97, 98Mo isotopes for the first time. This study enabled the determination of the previously unknown \frac{{\sigma}^{\rm int}(\gamma,{\rm n})}{{\sigma}^{\rm int}(\gamma,{\rm p})} cross-section ratios for these isotopes. The experiments were supported by extensive model calculations (Empire) and the results were compared to the Thomas–Reiche–Kuhn (TRK) dipole sum rule as well as to the experimental data in neighboring isotopes and good agreement was observed. The Coulomb barrier and the neutron excess strongly influence the \frac{{\sigma}^{\rm int}(\gamma,{\rm n})}{{\sigma}^{\rm int}(\gamma,{\rm p})} ratios for increasing target proton and neutron numbers.
Original languageEnglish
Article number043037
JournalNew Journal of Physics
Volume10
DOIs
Publication statusPublished - 2008

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bremsstrahlung
high power lasers
isotopes
protons
radiation
electrons
dipoles
activation analysis
lasers
neutrons
cross sections
nuclear reactions
sum rules
energy
photons
decay
estimates
interactions

Cite this

Spohr, K. M., Shaw, M., Galster, W., Ledingham, K. W. D., Robson, L., Yang, J. M., ... Sauerbrey, R. (2008). Study of photo-proton reactions driven by bremsstrahlung radiation of high-intensity laser generated electrons. New Journal of Physics, 10, [043037]. https://doi.org/10.1088/1367-2630/10/4/043037
Spohr, K.M. ; Shaw, M. ; Galster, W. ; Ledingham, K.W.D. ; Robson, L. ; Yang, J.M. ; McKenna, P. ; McCanny, T. ; Melone, J.J. ; Amthor, K.U. ; Ewald, F. ; Liesfeld, B. ; Schwoerer, H. ; Sauerbrey, R. / Study of photo-proton reactions driven by bremsstrahlung radiation of high-intensity laser generated electrons. In: New Journal of Physics. 2008 ; Vol. 10.
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abstract = "Photo-nuclear reactions were investigated using a high power table-top laser. The laser system at the University of Jena (I ~ 3–5×1019 W cm-2) produced hard bremsstrahlung photons (kT~2.9 MeV) via a laser–gas interaction which served to induce (γ, p) and (γ, n) reactions in Mg, Ti, Zn and Mo isotopes. Several (γ, p) decay channels were identified using nuclear activation analysis to determine their integral reaction yields. As the laser-generated bremsstrahlung spectra stretches over the energy regime dominated by the giant dipole resonance (GDR), these yield measurements were used in conjunction with theoretical estimates of the resonance energies Eres and their widths Γres to derive the integral reaction cross-section σint(γ,p) for 25Mn, 48, 49Ti, 68Zn and 97, 98Mo isotopes for the first time. This study enabled the determination of the previously unknown \frac{{\sigma}^{\rm int}(\gamma,{\rm n})}{{\sigma}^{\rm int}(\gamma,{\rm p})} cross-section ratios for these isotopes. The experiments were supported by extensive model calculations (Empire) and the results were compared to the Thomas–Reiche–Kuhn (TRK) dipole sum rule as well as to the experimental data in neighboring isotopes and good agreement was observed. The Coulomb barrier and the neutron excess strongly influence the \frac{{\sigma}^{\rm int}(\gamma,{\rm n})}{{\sigma}^{\rm int}(\gamma,{\rm p})} ratios for increasing target proton and neutron numbers.",
author = "K.M. Spohr and M. Shaw and W. Galster and K.W.D. Ledingham and L. Robson and J.M. Yang and P. McKenna and T. McCanny and J.J. Melone and K.U. Amthor and F. Ewald and B. Liesfeld and H. Schwoerer and R. Sauerbrey",
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Spohr, KM, Shaw, M, Galster, W, Ledingham, KWD, Robson, L, Yang, JM, McKenna, P, McCanny, T, Melone, JJ, Amthor, KU, Ewald, F, Liesfeld, B, Schwoerer, H & Sauerbrey, R 2008, 'Study of photo-proton reactions driven by bremsstrahlung radiation of high-intensity laser generated electrons' New Journal of Physics, vol. 10, 043037. https://doi.org/10.1088/1367-2630/10/4/043037

Study of photo-proton reactions driven by bremsstrahlung radiation of high-intensity laser generated electrons. / Spohr, K.M.; Shaw, M.; Galster, W.; Ledingham, K.W.D.; Robson, L.; Yang, J.M.; McKenna, P.; McCanny, T.; Melone, J.J.; Amthor, K.U.; Ewald, F.; Liesfeld, B.; Schwoerer, H.; Sauerbrey, R.

In: New Journal of Physics, Vol. 10, 043037, 2008.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Study of photo-proton reactions driven by bremsstrahlung radiation of high-intensity laser generated electrons

AU - Spohr, K.M.

AU - Shaw, M.

AU - Galster, W.

AU - Ledingham, K.W.D.

AU - Robson, L.

AU - Yang, J.M.

AU - McKenna, P.

AU - McCanny, T.

AU - Melone, J.J.

AU - Amthor, K.U.

AU - Ewald, F.

AU - Liesfeld, B.

AU - Schwoerer, H.

AU - Sauerbrey, R.

PY - 2008

Y1 - 2008

N2 - Photo-nuclear reactions were investigated using a high power table-top laser. The laser system at the University of Jena (I ~ 3–5×1019 W cm-2) produced hard bremsstrahlung photons (kT~2.9 MeV) via a laser–gas interaction which served to induce (γ, p) and (γ, n) reactions in Mg, Ti, Zn and Mo isotopes. Several (γ, p) decay channels were identified using nuclear activation analysis to determine their integral reaction yields. As the laser-generated bremsstrahlung spectra stretches over the energy regime dominated by the giant dipole resonance (GDR), these yield measurements were used in conjunction with theoretical estimates of the resonance energies Eres and their widths Γres to derive the integral reaction cross-section σint(γ,p) for 25Mn, 48, 49Ti, 68Zn and 97, 98Mo isotopes for the first time. This study enabled the determination of the previously unknown \frac{{\sigma}^{\rm int}(\gamma,{\rm n})}{{\sigma}^{\rm int}(\gamma,{\rm p})} cross-section ratios for these isotopes. The experiments were supported by extensive model calculations (Empire) and the results were compared to the Thomas–Reiche–Kuhn (TRK) dipole sum rule as well as to the experimental data in neighboring isotopes and good agreement was observed. The Coulomb barrier and the neutron excess strongly influence the \frac{{\sigma}^{\rm int}(\gamma,{\rm n})}{{\sigma}^{\rm int}(\gamma,{\rm p})} ratios for increasing target proton and neutron numbers.

AB - Photo-nuclear reactions were investigated using a high power table-top laser. The laser system at the University of Jena (I ~ 3–5×1019 W cm-2) produced hard bremsstrahlung photons (kT~2.9 MeV) via a laser–gas interaction which served to induce (γ, p) and (γ, n) reactions in Mg, Ti, Zn and Mo isotopes. Several (γ, p) decay channels were identified using nuclear activation analysis to determine their integral reaction yields. As the laser-generated bremsstrahlung spectra stretches over the energy regime dominated by the giant dipole resonance (GDR), these yield measurements were used in conjunction with theoretical estimates of the resonance energies Eres and their widths Γres to derive the integral reaction cross-section σint(γ,p) for 25Mn, 48, 49Ti, 68Zn and 97, 98Mo isotopes for the first time. This study enabled the determination of the previously unknown \frac{{\sigma}^{\rm int}(\gamma,{\rm n})}{{\sigma}^{\rm int}(\gamma,{\rm p})} cross-section ratios for these isotopes. The experiments were supported by extensive model calculations (Empire) and the results were compared to the Thomas–Reiche–Kuhn (TRK) dipole sum rule as well as to the experimental data in neighboring isotopes and good agreement was observed. The Coulomb barrier and the neutron excess strongly influence the \frac{{\sigma}^{\rm int}(\gamma,{\rm n})}{{\sigma}^{\rm int}(\gamma,{\rm p})} ratios for increasing target proton and neutron numbers.

U2 - 10.1088/1367-2630/10/4/043037

DO - 10.1088/1367-2630/10/4/043037

M3 - Article

VL - 10

JO - New Journal of Physics

JF - New Journal of Physics

SN - 1367-2630

M1 - 043037

ER -