Photon-induced Nucleosynthesis: Current Problems and Experimental Approaches

Abstract

Photon-induced reactions play a key role in the nucleosynthesis of rare neutron-deficient p-nuclei. The paper focuses on (gamma,alpha), (gamma,p), and (gamma,n) reactions which define the corresponding p-process path. The relation between stellar reaction rates and laboratory cross sections is analyzed for photon-induced reactions and their inverse capture reactions to evaluate various experimental approaches. An improved version S_C(E) of the astrophysical S-factor is suggested which is based on the Coulomb wave functions. S_C(E) avoids the apparent energy dependence which is otherwise obtained for capture reactions on heavy nuclei. It is found that a special type of synchrotron radiation available at SPring-8 that mimics stellar blackbody radiation at billions of Kelvin is a promising tool for future experiments. By using the blackbody synchrotron radiation, sufficient event rates for (gamma,alpha) and (gamma,p) reactions in the p-process path can be expected. These experiments will provide data to improve the nuclear parameters involved in the statistical model and thus reduce the uncertainties of nucleosynthesis calculations.

13 pages, 6 figures, EPJA, accepted

References in corpus (31)

• Nucleosynthesis in Massive Stars With Improved Nuclear and Stellar Physics
• Astrophysical Reaction Rates From Statistical Model Calculations
• Neutrino-induced nucleosynthesis of A>64 nuclei: The nu p-process
• Nucleosynthesis in Early Supernova Winds II: The Role of Neutrinos
• Sensitivity of p-Process Nucleosynthesis to Nuclear Reaction Rates in a 25 Solar Mass Supernova Model
• Branchings in the gamma-process path revisited
• alpha-nucleus potentials for the neutron-deficient p nuclei
• Alpha-induced cross sections of 106Cd for the astrophysical p-process
• The ^{144}Sm-αoptical potential at astrophysically relevant energies derived from ^{144}Sm(α,α)^{144}Sm elastic scattering
• Experimental simulation of a stellar photon bath by bremsstrahlung: the astrophysical $\gamma$-process
• Evidence for nucleosynthesis in supernova $\gamma$-process: Universal scaling on p-nuclei
• Measurement of the (gamma,n) reaction rates of the nuclides 190Pt, 192Pt, and 198Pt in the astrophysical gamma-process
• Survival of Nature's Rarest Isotope 180Ta under Stellar Conditions
• ${}^{92}$Mo($\alpha ,\alpha$)${}^{92}$Mo scattering,the ${}^{92}$Mo--$\alpha$ optical potential, and the ${}^{96}$Ru($\gamma ,\alpha$)${}^{92}$Mo reaction rate at astrophysically relevant energies
• Direct determination of photodisintegration cross sections and the p-process
• Super-allowed alpha-decay above doubly-magic 100Sn and properties of 104Te = 100Sn otimes alpha
• The s-process branching at 185W
• Predicted cross sections for photon-induced particle emission
• Proton induced reaction cross section measurements on Se isotopes for the astrophysical p process
• Elastic alpha-scattering of 112Sn and 124Sn at astrophysically relevant energies
• Photo-disintegration cross section measurements on ${}^{186}$W, ${}^{187}$Re and ${}^{188}$Os: Implications for the Re-Os cosmochronology
• P-Process Nucleosynthesis inside Supernova-Driven Supercritical Accretion Disks
• Proton capture cross section of Sr isotopes and their importance for nucleosynthesis of proton-rich nuclides
• s-process branching at 185W revised
• Resonance analysis of ${}^{147}$Sm(n,alpha) cross sections: Comparison to optical model calculations and indications of non-statistical effects
• Systematic study of (g,n) reaction rates for Z>=78 isotopes
• Proton capture cross section of 106,108Cd for the astrophysical p-process
• Nucleosynthesis in Fast Expansions of High-Entropy, Proton Rich Matter
• Low-Energy Direct Capture in the 16O(alpha,gamma)20Ne Reaction
• Relation between the 16O(alpha,gamma)20Ne reaction and its reverse 20Ne(gamma,alpha)16O reaction in stars and in the laboratory
• Photon-induced Reactions in Stars and in the Laboratory: A Critical Comparison

Cited by in corpus (28)

• Odd p isotope 113In: Measurement of alpha-induced reactions
• The activation method for cross section measurements in nuclear astrophysics
• Elastic alpha scattering experiments and the alpha-nucleus optical potential at low energies
• Coulomb suppression of the stellar enhancement factor
• Alpha-induced reaction cross section measurements on 151Eu for the astrophysical gamma-process
• Determining reaction cross sections via characteristic X-ray detection: α-induced reactions on 169Tm for the astrophysical γ -process
• Suppression of the stellar enhancement factor and the reaction 85Rb(p,n)85Sr
• Alpha induced reaction cross section measurements on 162Er for the astrophysical gamma process
• High precision ${}^{113}$In($\alpha ,\alpha$)${}^{113}$In elastic scattering at energies around the Coulomb barrier for the astrophysical $\gamma$ process
• Investigation of $\alpha$-induced reactions on Sb isotopes relevant to the astrophysical $\gamma$-process
• Measurements of ${}^{152}$Gd(p,$\gamma$)${}^{153}$Tb and ${}^{152}$Gd(p,n)${}^{152}$Tb reaction cross sections for the astrophysical $\gamma$ process
• Determination of the photodisintegration reaction rates involving charged particles: systematical calculations and proposed measurements based on Extreme Light Infrastructure - Nuclear Physics (ELI-NP)
• Investigation of alpha-induced reactions on 127I for the astrophysical gamma process
• Photoactivation at a clinical LINAC: The 197Au(gamma,n)196Au reaction slightly above threshold
• ${}^{110,116}$Cd($\alpha ,\alpha$)${}^{110,116}$Cd elastic scattering and systematic investigation of elastic $\alpha$ scattering cross sections along the $Z$ = 48 isotopic and $N$ = 62 isotonic chains
• Measurements of proton induced reaction cross sections on 120Te for the astrophysical p-process
• Properties of the 5- state at 839 keV in 176Lu and the s-process branching at A = 176
• Statistical model analysis of $\alpha$-induced reaction cross sections of ${}^{64}$Zn at low energies
• $\alpha$-scattering and $\alpha$-induced reaction cross sections of ${}^{64}$Zn at low energies
• Measurement of (alpha,n) reaction cross sections of erbium isotopes for testing astrophysical rate predictions
• Cross section of $\alpha$-induced reactions on iridium isotopes obtained from thick target yield measurement for the astrophysical $\gamma$ process
• Photodisintegration studies on p-nuclei: The case of Mo and Sm isotopes
• Measurements of ${}^{160}$Dy($p,\gamma$) at energies relevant for astrophysical $\gamma$ process
• Feasibility of studying astrophysically important charged-particle emission with the variable energy $\gamma$-ray system at the Extreme Light Infrastructure -- Nuclear Physics facility
• Alpha-induced reactions for the astrophysical p-process: the case of 151Eu
• Measurement of the 91Zr(p,gamma)92mNb cross section motivated by type Ia supernova nucleosynthesis
• High precision half-life measurement of ${}^{125}$Cs and ${}^{125}$Xe with γ-spectroscopy
• The Cross Section Calculation of the ${}^{112}$Sn($\alpha$,$\gamma$)${}^{116}$Te Reaction with Different Nuclear Models at the Astrophysical Energy Range