New Thermonuclear Reaction Rate Equations for Radiative Neutron Capture
نویسندگان
چکیده
The radiative neutron capture reaction rates have been studied at very low energies which are of interest for nuclear astrophysics. many these reactions remained independent temperature so far. dependence the thermonuclear explored within statistical model. Apart from compound contribution, pre-equilibrium as well direct effects taken into account. corresponding Maxwellian-averaged relevance in astrophysical plasmas temperatures range 10$^6$ K to 10$^{10}$ calculated. Analytical expression a function $T_9$ has provided $^6$Li(n,$\gamma$)$^7$Li by fitting calculated rate.
منابع مشابه
Radiative Neutron Capture on Lithium-7
The radiative neutron capture on lithium-7 is calculated model independently using a low energy halo effective field theory. The cross section is expressed in terms of scattering parameters directly related to the S-matrix element. The cross section depends on the poorly known p-wave effective range parameter r1. This constitutes the leading order uncertainty in traditional model calculations. ...
متن کاملRadiative neutron capture on a proton at BBN energies
The total cross section for radiative neutron capture on a proton, np → dγ, is evaluated at big bang nucleosynthesis (BBN) energies. The electromagnetic transition amplitudes are calculated up to next-to leading order within the framework of pionless effective field theory with dibaryon fields. We also calculate the dγ → np cross section and the photon analyzing power for the d~γ → np process f...
متن کاملRadiative neutron-proton capture in effective chiral Lagrangians.
We calculate the cross-section for the thermal n+ p → d+ γ process in chiral perturbation theory to next-to-next-to-leading order using heavy-fermion formalism. The exchange current correction is found to be (4.5 ± 0.3) % in amplitude and the chiral perturbation at one-loop order gives the cross section σ th = (334 ± 2) mb which is in agreement with the experimental value (334.2 ± 0.5) mb. Toge...
متن کاملModel-independent calculation of radiative neutron capture on lithium-7.
The radiative neutron capture on lithium-7 is calculated model independently using a low-energy halo effective field theory. The cross section is expressed in terms of scattering parameters directly related to the S-matrix elements. It depends on the poorly known p-wave effective range parameter r(1). This constitutes the largest uncertainty in traditional model calculations. It is explicitly d...
متن کاملΛ-Neutron Scattering Lengths from Radiative K− Capture
Radiative capture of the K by the deuteron is examined as a reaction for measurement of the Λ-neutron scattering lengths. Using the final state interaction, analogous to measurements of the radiative capture of pions by deuterium, the scattering lengths of both the triplet and singlet Λ-n interaction can be inferred. The problem of the separation of these two fundamental parameters without and ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Acta Physica Polonica B
سال: 2021
ISSN: ['0587-4254', '1509-5770']
DOI: https://doi.org/10.5506/aphyspolb.52.453