Simultaneous measurement of the photodisintegration of 4He in the giant dipole resonance region

Abstract

We have performed for the first time the simultaneous measurement of the two-body and three-body photodisintegration cross-sections of 4He in the energy range from 21.8 to 29.8 MeV using monoenergetic pulsed photons and a 4-pi time projection chamber containing 4He gas as an active target in an event-by-event mode. The photon beam was produced via the Compton backscattering of laser photons with high-energy electrons. The 4He(gamma,p)3H and 4He(gamma,n)3He cross sections were found to increase monotonically with energy up to 29.8 MeV, in contrast to the result of a recent theoretical calculation based on the Lorentz integral transform method which predicted a pronounced peak at around 26-27 MeV. The energy dependence of the obtained 4He(gamma,n)3He cross section up to 26.5 MeV is marginally consistent with a Faddeev-type calculation predicting a flat pattern of the excitation function. The cross-section ratio of 4He(gamma,p)3H to 4He(gamma,n)3He is found to be consistent with the expected value for charge symmetry of the strong interaction within the experimental uncertainty in the measured energy range. The present results for the total and two-body cross-sections of the photodisintegration of 4He are compared to previous experimental data and recent theoretical calculations.

19 pages, 24 figures, accepted for publication in Phys. Rev. C

References in corpus (6)

• Two-body Photodisintegration of ${}^4$He with Full Final State Interaction
• Benchmark Calculation of the Three-Nucleon Photodisintegration
• Is there a Pronounced Giant Dipole Resonance in ^4He?
• Search for Three-Nucleon Force Effects in Two-Body Photodisintegration of 3He(3H) and in the Time Reversed Proton-Deuteron Radiative Capture Process
• Total 4He Photoabsorption Cross Section Revisited: Correlated HH versus Effective Interaction HH
• Photodisintegration of three- and four- nucleon systems

Cited by in corpus (33)

• Recent developments in no-core shell-model calculations
• The Lorentz Integral Transform (LIT) method and its applications to perturbation induced reactions
• Modern Ab Initio Approaches and Applications in Few-Nucleon Physics with A \ge 4
• alpha-particle photoabsorption with a realistic nuclear force
• The ${}^4$He total photo-absorption cross section with two- plus three-nucleon interactions from chiral effective field theory
• Electric dipole polarizability from first principles calculations
• Universal Correlations in Pion-less EFT with the Resonating Group Model: Three and Four Nucleons
• Ab initio study of the photoabsorption of ${}^4$He
• Ab initio calculation of nuclear structure corrections in muonic atoms
• New Constraints on Radiative Decay of Long-Lived Particles in Big Bang Nucleosynthesis with New ${}^4$He Photodisintegration Data
• Cosmological solutions to the Lithium problem: Big-bang nucleosynthesis with photon cooling, $X$-particle decay and a primordial magnetic field
• Towards a Unified Model of Neutrino-Nucleus Reactions for Neutrino Oscillation Experiments
• Effects of Long-lived 10 MeV Scale Sterile Neutrino on Primordial Elemental Abundances and Effective Neutrino Number
• A Big-Bang Nucleosynthesis Limit on the Neutral Fermion Decays into Neutrinos
• Solution to Big-Bang Nucleosynthesis in Hybrid Axion Dark Matter Model
• A measurement of the 4He(g,n) reaction from 23 < Eg < 70 MeV
• New results for reaction rate of the proton radiative capture on 3H
• Photodisintegration of light nuclei for testing a correlated realistic interaction in the continuum
• Isospin Effects on Astrophysical S-Factors
• Spectroscopic properties of 4He within a multiphonon approach
• Ab initio no-core shell model and microscopic reactions: recent achievements
• The photo-disintegration of ${}^4$He on the cosmic microwave background is less severe than earlier thought
• New test of Lorentz symmetry using ultrahigh-energy cosmic rays
• Spin polarization observables of the deuteron photodisintegration at low energies in pionless effective field theory
• Self-consistent continuum random phase approximation calculations of ${}^4$He electromagnetic responses
• Electromagnetic Observables in Few-Nucleon Systems
• Electromagnetic reactions of few-body systems with the Lorentz integral transform method
• The Lorentz integral transform (LIT) method
• Influence of Gamma-Ray Emission on the Isotopic Composition of Clouds in the Interstellar Medium
• Electromagnetic Reactions and Few-Nucleon Dynamics
• Photodisintegration Cross Section of ${}^4$He in the Giant Dipole Resonance Energy Region
• New Photodisintegration Model of GEANT4 for the $d\gamma \to np$ Reaction with a Dibaryon Effective Field Theory
• Possible measurement of P-states probability in the ${}^4$He nucleus