Photon polarization in the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>(γ,<i>d</i>→<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mo>)</mml:mo></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow><

Tomusiak, E.L.; Leidemann, Winfried; Hofmann, H.M.

doi:10.1103/physrevc.52.1963

Cited by 3 publications

(4 citation statements)

References 20 publications

(22 reference statements)

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“…Omitting the last remaining S = 1 channels, which had expansion coefficients barely larger than those of the deleted states, we lost again more than an MeV. [27] . Its structure is given in appendix B.…”

Section: The R-matrix Analysismentioning

confidence: 99%

“…In the RGM calculation we "locate" therefore a resonance at that energy, where the difference between the calculated phase shift and the "background phase shift", determined from the appropriate channel radius, passes through ninety degrees. (27) Increasing the model space even further improved the binding energy only marginally, but needed much more computing time and caused almost numerical linear dependencies;…”

Section: The R-matrix Analysismentioning

confidence: 99%

“…Here Y denote solid spherical harmonics [27] . The width parameters β n and the coefficients c n for the deuteron and the singlet deuteron d -are given in table 7.…”

Section: A Appendix 1: Wave Functions Of the Fragmentsmentioning

confidence: 99%

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Microscopic calculation of the 4He system

Hofmann

Hale

1997

Nuclear Physics A

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We report on a consistent, microscopic calculation of the bound and scattering states in the 4 He system employing a realistic nucleon-nucleon potential in the framework of the resonating group model (RGM). We present for comparison with these microscopic RGM calculations the results from a charge-independent, Coulomb-corrected R-matrix analysis of all types of data for reactions in the A = 4 system. Comparisons are made between the phase shifts, and with a selection of measurements from each reaction, as well as between the resonance spectra obtained from both calculations. In general, the comparisons are favorable, but distinct differences are observed between the RGM calculations and some of the polarisation data. The partial-wave decomposition of the experimental data produced by the Rmatrix analysis shows that these differences can be attributed to just a few S-matrix elements, for which inadequate tensor-force strength in the N − N interaction used appears to be responsible.

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Section: The R-matrix Analysismentioning

confidence: 99%

Section: The R-matrix Analysismentioning

confidence: 99%

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Microscopic calculation of the 4He system

Hofmann

Hale

1997

Nuclear Physics A

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“…Since the (γ, d)d cross section can be safely neglected (see e.g. [17]) this should lead to a rather good estimate for the total cross section below the three-body breakup threshold. Furthermore, we also show the cross sections of other low-energy experiments [18][19][20].…”

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confidence: 99%

Is There a Pronounced Giant Dipole Resonance inH4e?

1997

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A four-nucleon calculation of the total 4 He photodisintegration cross section is performed. The full final-state interaction is taken into account for the first time. This is achieved via the method of the Lorentz integral transform.Semi-realistic NN interactions are employed. Different from the known partial two-body 4 He(γ, n) 3 He and 4 He(γ, p) 3 H cross sections our total cross section exhibits a pronounced giant resonance. Thus, in contrast to older (γ, np) data, we predict quite a strong contribution of the (γ, np) channel at the giant resonance peak energy.

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Electromagnetic response functions of few-nucleon systems

2001

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Inclusive electromagnetic reactions in few-nucleon systems are studied basing on accurate three- and four-body calculations. The longitudinal 4He(e,e') response function obtained at q\le 600 MeV/c completely agrees with experiment. The exact 4He spectral function obtained in a semirealistic potential model is presented, and the accuracy of the quasielastic response calculated with its help is assessed, as well as the accuracy of some simpler approximations for the response. The photodisintegration cross section of 3He obtained with the realistic AV14 NN force plus UrbanaVIII NNN force agrees with experiment. It is shown that this cross section is very sensitive to underlying nuclear dynamics in the E_\gamma\simeq 70-100 MeV region. In particular, the NNN nuclear force clearly manifests itself in this region.Comment: 10 pages, Latex, style file is included, 7 ps figures, to appear in Proc. of the 2nd Int. Conf. on Perspectives in Hadronic Physics, ITCP, Triest, May 1999, World Sci., Singapor

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Photon polarization in theHe4(γ,d→)2<

Cited by 3 publications

References 20 publications

Microscopic calculation of the 4He system

Microscopic calculation of the 4He system

Is There a Pronounced Giant Dipole Resonance inH4e?

Electromagnetic response functions of few-nucleon systems

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