First measurement of the asymmetry and the Gerasimov-Drell-Hearn integrand from the 
<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mover accent="true"><mml:mmultiscripts><mml:mi>He</mml:mi><mml:mprescripts /><mml:none /><mml:mn>3</mml:mn></mml:mmultiscripts><mml:mo>⃗</mml:mo></mml:mover><mml:mrow><mml:mo>(</mml:mo><mml:mover accent="true"><mml:mi>γ</mml:mi><mml:mo>⃗</mml:mo></mml:mover><mml:mo>,</mml:mo><mml:mi>p</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mmultiscripts><mml:mi math

Hadron properties are modified when the hadron is embedded in a nuclear medium. Here we discuss the Gerasimov-Drell-Hearn, GDH, sum rule for polarised photoproduction from a polarised nucleon within a polarised nuclear target. Strong enhancement is expected with the suppression of the proton and nucleon resonance masses and enhancement of the proton’s anomalous magnetic moment in medium. This could be tested in polarised photoproduction experiments with interesting targets being polarised deuterons, $$^3$$ 3 He, $$^6$$ 6 Li and $$^7$$ 7 Li. The largest contribution to the GDH sum rule comes from the $$\Delta $$ Δ resonance excitation. In existing data with polarised deuterons and $$^3$$ 3 He the $$\Delta $$ Δ excitation is shifted to slightly lower energy when compared to model predictions where the $$\Delta $$ Δ is treated with its free mass.

show abstract

Amplitudes of 3H, 3He Two-Particle Photo-Breakup in Non-Local QED Approach

Kuznietsov,

Kasatkin,

Klepikov

2023

East Eur. J. Phys.

View full text Add to dashboard Cite

Three-nucleon systems are essential for the investigation of many-body forces in nuclear physics. Well-grounded parametrization of their vertex functions with further application for the calculation of cross-sections in nonlocal QED approach provides the ground for investigation of the variety of multi-particle systems. In present paper we describe the process of parametrization of two-particle photo-breakup amplitudes of three-nucleon systems (3H, 3He). We provide the general description of the wave function construction for three-nucleon systems as well as the parametrization of their vertex functions accounting two- and three-nucleon interactions based on meson exchange current formalism. In our calculations we account first and second order one-pion exchange terms and the term related to the exchange of ω and ρ mesons. The three-nucleon interaction potential is given as a sum of attraction (two-pion exchange) term andappropriate repulsive part. Based on the variational ”Urbana + Model VII” amplitudes we provide the results for energy dependence of differential cross-section of 3He(γ, p)d reaction at proton angle θ = 90◦ from the threshold up to Eγ = 40 MeV and compare theoretical predictions with the available experimental data. The investigation is also provided for angular cross-section distributions at high photon energies (Eγ = 305 ± 5 MeV; 365 ± 5 MeV; 450 ± 10 MeV and 675 ± 50 MeV). Correct description of 3H, 3He photo-disintegration processes in a unified approach based on the gauge nature of the electromagnetic field implies application of this model for other multi-particle systems.

show abstract

scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.

Contact Info

customersupport@researchsolutions.com

10624 S. Eastern Ave., Ste. A-614

Henderson, NV 89052, USA

This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.

Blog Terms and Conditions API Terms Privacy Policy Contact Cookie Preferences Do Not Sell or Share My Personal Information

Made with 💙 for researchers

Part of the Research Solutions Family.

First measurement of the asymmetry and the Gerasimov-Drell-Hearn integrand from the He3⃗(γ⃗,p)

Cited by 3 publications

References 46 publications

Photonuclear reactions—From basic research to applications

Photonuclear reactions—From basic research to applications

The Gerasimov-Drell-Hearn sum rule with nuclear targets

Amplitudes of 3H, 3He Two-Particle Photo-Breakup in Non-Local QED Approach

Contact Info

Product

Resources

About