Impact of a low-energy enhancement in the gamma-ray strength function on the radiative neutron-capture

Abstract

A low-energy enhancement of the gamma-ray strength function in several light and medium-mass nuclei has been observed recently in 3He-induced reactions. The effect of this enhancement on (n,gamma) cross-sections is investigated for stable and unstable neutron-rich Fe, Mo and Cd isotopes. Our results indicate that the radiative neutron capture cross sections may increase considerably due to the low-energy enhancement when approaching the neutron drip line. This could have non-negligible consequences on r-process nucleosynthesis calculations.

arXiv comment9 pages, 7 figures. Published in Phys. Rev. C

References in corpus (12)

• The r-process of stellar nucleosynthesis: Astrophysics and nuclear physics achievements and mysteries
• Skyrme-Hartree-Fock-Bogoliubov nuclear mass formulas: Crossing the 0.6 MeV threshold with microscopically deduced pairing
• Extraction of level density and gamma strength function from primary gamma spectra
• Improved predictions of nuclear reaction rates with the TALYS reaction code for astrophysical applications
• Radiative strength functions in 93-98Mo
• Large enhancement of radiative strength for soft transisitons in the quasicontinuum
• Nuclear level densities and gamma-ray strength functions in 44,45Sc
• Microcanonical entropies and radiative strength functions of ${}^{50,51}$V
• Gamma-strength functions in 60Ni from two-step cascades following proton capture
• Thermodynamic Properties of ${}^{56,57}$Fe
• Establishment of M1 multipolarity of a 6.5 mu_N^2 resonance in 172-Yb at E_gamma=3.3 MeV
• Enhanced radiative strength in the quasi-continuum of 117Sn

Cited by in corpus (47)

• Origin of the Heaviest Elements: the Rapid Neutron-Capture Process
• The impact of individual nuclear properties on $r$-process nucleosynthesis
• Further explorations of the alpha-particle optical model potential at low energies for the mass range A=45-209
• Analysis of possible systematic errors in the Oslo method
• Novel technique for constraining r-process (n,$\gamma$) reaction rates
• Low-energy enhancement of magnetic dipole radiation
• Large-scale Continuum Random Phase Approximation predictions of dipole strength for astrophysical applications
• Evidence for dipole nature of the low-energy $\gamma$ enhancement in ${}^{56}$Fe
• Have Superheavy Elements been Produced in Nature?
• Large low-energy $M1$ strength for ${}^{56,57}$Fe within the nuclear shell model
• Novel Techniques for Constraining Neutron-Capture Rates Relevant for r-Process Heavy-Element Nucleosynthesis
• Low-energy limit of the radiative dipole strength in nuclei
• Electric and magnetic dipole modes in high-resolution inelastic proton scattering at $0^{\circ }$
• Transitional $\gamma$ strength in Cd isotopes
• Estimation of M1 scissors mode strength for deformed nuclei in the medium to heavy mass region by statistical Hauser-Feshbach model calculations
• Relativistic two-phonon model for low-energy nuclear response
• Test of the Brink-Axel hypothesis for the pygmy dipole resonance
• Low-energy enhancement in the γ-ray strength functions of ${}^{73,74}$Ge
• Understanding the Low-Energy Enhancement of the $\gamma$-ray Strength Function of ${}^{56}$Fe
• Experimentally constrained ($p,\gamma$)${}^{89}$Y and ($n,\gamma$)${}^{89}$Y reaction rates relevant to the $p$-process nucleosynthesis
• Enhanced low-energy $\gamma$-decay strength of ${}^{70}$Ni and its robustness within the shell model
• ${}^{60}$Fe in core-collapse supernovae and prospects for X-ray and $\gamma$-ray detection in supernova remnants
• Consolidating the concept of low-energy magnetic dipole decay radiation
• Systematics of strength function sum rules
• Low energy magnetic radiation enhancement in the f${}_{7/2}$ shell
• Astrophysical S-factors for fusion reactions involving C, O, Ne and Mg isotopes
• Low-energy enhancement and fluctuations of $\gamma$-ray strength functions in ${}^{56,57}$Fe: test of the Brink-Axel hypothesis
• ${}^{137,138,139}$La($n$, $\gamma$) cross sections constrained with statistical decay properties of ${}^{138,139,140}$La nuclei
• Multipole excitations in hot nuclei within the finite temperature quasiparticle random phase approximation framework
• Nuclear Dipole Response in the Finite-Temperature Relativistic Time Blocking Approximation
• Nuclear Level Density and Gamma-Ray Strength Function of 43Sc
• RAINIER: A Simulation Tool for Distributions of Excited Nuclear States and Cascade Fluctuations
• Completing the nuclear reaction puzzle of the nucleosynthesis of 92Mo
• Analysis of uncertainties in alpha-particle optical-potential assessment below the Coulomb barrier
• Breaking of axial symmetry in excited heavy nuclei as identified in Giant Dipole Resonance data
• Transition sum rules in the shell model
• Consistent optical potential for incident and emitted low-energy $\alpha$ particles. II. $\alpha$-emission in fast-neutron induced reactions on Zr isotopes
• Primary gamma-ray spectra in 44Ti of astrophysical interest
• Enhanced production of 60Fe in massive stars
• Role of consistent parameter sets in an assessment of the alpha-particle optical potential below the Coulomb barrier
• Beta-delayed fission in the coupled Quasi-particle Random Phase Approximation plus Hauser-Feshbach approach
• Impact of level densities and $\gamma$-strength functions on $r$-process simulations
• Low-energy enhancement in the magnetic dipole $\gamma$-ray strength functions of heavy nuclei
• Benchmark of many-body approaches for magnetic dipole transition strength
• Effect of broken axial symmetry on the electric dipole strength and the collective enhancement of level densities in heavy nuclei
• Nuclear level densities and $\gamma$-ray strength functions of ${}^{87}\mathrm{Kr}$ -- First application of the Oslo Method in inverse kinematics
• The beta-Oslo method: experimentally constrained ($n,\gamma$) reaction rates relevant to the $r$-process