A ug 2 00 5 Near - threshold measurement of the 4 He ( γ , n ) reaction

0 50 60 01 v 2 1 4 Ju l 2 00 5 Near - threshold measurement of the 4 He ( γ , n ) reaction

A near-threshold He(γ, n) cross-section measurement has been performed at MAXlab. Tagged photons from 23 < Eγ < 42 MeV were directed toward a liquid He target, and neutrons were detected by time-of-flight in two liquid-scintillator arrays. Seven-point angular distributions were measured for eight photon energies. The results are compared to experimental data measured at comparable energies and ...

ar X iv : n uc l - th / 0 31 10 78 v 1 2 1 N ov 2 00 3 1 The 4 He ( γ , n ) 3 He Reaction with Full Final State Interaction

The total cross sections of the processes He(γ, p)H and He(γ, n)He are calculated. For these exclusive reactions we investigate the question of the giant dipole peak height, but we also consider higher energies. The calculation includes full Final State Interaction (FSI) via the Lorentz Integral Transform (LIT) approach [1] and employs the semi-realistic MTI-III potential [2]. The LIT method ha...

uc l - th / 0 40 80 17 v 1 5 A ug 2 00 4 1 Study of the 16 O ( p , γ ) Reaction at Astrophysical Energies

The Feshbach theory of the optical potential naturally leads to a microscopic description of scattering in terms of the many-body self-energy. We consider a recent calculation of this quantity for O and study the possibility of applying it at astrophysical energies. The results obtained for the phase shifts and the O(p,γ) capture suggest that such studies are feasible but the calculations requi...

ar X iv : h ep - p h / 97 12 41 5 v 2 1 9 A ug 2 00 4 The ALLM parameterization of σ tot ( γ ∗ p ) an update

ar X iv : h ep - t h / 01 07 21 9 v 5 3 A ug 2 00 1 The Gauge Technique in QED 2 + 1

The Gauge Technique has been applied to QED2+1 in the quenched case with infrared subtraction. The behaviour of the fermion propagator near the threshold is then found to be S(p) → (γ · p+m) (p −m) ( p −m 2m ) exp(− ης 2 ), where ς = e/(4πm) and this is gauge invariant except the exponential factor. We also find a spectral function in the Landau and Yennie like gauge. The propagators S(p) are e...