Pion production off light nuclei

Laget, J. M.

doi:10.1007/3-540-10570-0_15

Cited by 12 publications

(5 citation statements)

References 9 publications

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“…Therefore, QD are the smallest cluster states in nuclei which may show up in the interaction with photons. There are several approaches to a description of QD excitations of which we mention the approaches of Levinger [154], Gottfried [155] and Laget [156]. From the point of view of a proper treatment of degrees of freedom and sum rules, the Laget model is the most appropriate one , because it relates the total QD strength to exchange currents via the relation…”

Section: Further Properties Of Quasideuteronsmentioning

confidence: 99%

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Compton scattering by nuclei

et al. 2000

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The concept of Compton scattering by even-even nuclei from giant-resonance to nucleon-resonance energies and the status of experimental and theoretical researches in this field are outlined. The description of Compton scattering by nuclei starts from different complementary approaches, namely from second-order S-matrix and from dispersion theories. Making use of these, it is possible to incorporate into the predicted nuclear scattering amplitudes all the information available from other channels, viz. photon-nucleon and photon-meson channels, and to efficiently make use of models of the nucleon, the nucleus and the nucleon-nucleon interaction. The total photoabsorption cross section constrains the nuclear scattering amplitude in the forward direction. The specific information obtained from Compton scattering therefore stems from the angular dependence of the nuclear scattering amplitude, providing detailed insight into the dynamics of the nuclear and nucleon degrees of freedom and into the interplay between them. Nuclear Compton scattering in the giant-resonance energy-region provides information on the dynamical properties of the in-medium mass of the nucleon. Most prominently, the electromagnetic polarizabilities of the nucleon in the nuclear medium can be extracted from nuclear Compton scattering data obtained in the quasideuteron energy-region. In our description of this latter process special emphasis is laid upon the exploration of many-body and two-body effects entering into the nuclear dynamics. Recent results are presented for two-body effects due to the mesonic seagull amplitude and due to the excitation of nucleon internal degrees of freedom accompanied by meson exchanges. Due to these studies the inmedium electromagnetic polarizabilities are by now well understood, whereas the understanding of nuclear Compton scattering in the ∆-resonance range is only at the beginning. Furthermore, phenomenological methods how to include retardation effects in the scattering amplitude are discussed and compared with model predictions.

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Section: Further Properties Of Quasideuteronsmentioning

confidence: 99%

“…On the other hand also the shape of the QD cross section [154][155][156] is known either in the form of the Levinger parameterization [154], the Laget parameterization [156] or a (QD) Lorentzian representation (cf. sections 2 and 5).…”

Section: Low-energy Behavior Of the Scattering Amplitude And Dispersimentioning

confidence: 99%

Compton scattering by nuclei

et al. 2000

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“…As shown in [15], the r.h.s, of [4] can be fitted to the QD cross section given by Lager [16]. This author used an improved version of the old QD model considering only the exchange part of the deuteron photodisintegration cross section and stressing the importance in the QD model of the correlation mechanism of the neutron-proton pair.…”

Section: R(e)=a+b L~ +Ce~mentioning

confidence: 99%

“…Since we do not yet have a theory for an "a priori" prediction of the value of D, we infer phenomenologically D ~ 60 MeV for heavy nuclei, by comparing the QD cross section containing nucleon swelling to the total photoabsorption experimental results [15] and to the QD model of Laget [16]. The photofission cross section is then given by…”

Section: R(e)=a+b L~ +Ce~mentioning

confidence: 99%

“…Fission is a slow process, thus the photofissioning nucleus retains memory of the excitation mechanism and a relation should exist between the prior history and the saddle to scission descent [34], e.g. between the average value off (16) The crucial point is to understand the descent from saddle to scission. From experiments we can observe that most of the potential energy available from saddle to scission (usually about 30 MeV) does not appear as kinetic energy among the fission coordinate.…”

Section: E~= Ex>> Bf Ex>> Bn [201mentioning

confidence: 99%

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Photofission of209Bi,232Th and238U in the quasi-deuteron energy region

Delsanto

Fubini

Murgia

et al. 1992

Z. Physik A - Hadrons and Nuclei

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Photofission cross sections of 2~ 238U and 232Th are very different, both in magnitude and in their dependence on the incident photon energy. In fact, in the quasideuteron energy region, cry (Bi)< 10-2crf(U), with crf(Yh) having intermediate values. Also crl(Bi) increases monotonically vs. E~, while cri(U) and uj(Th) (above 75 MeV) are approximatively constant. We propose here a parametrization of photofission in the quasi-deuteron region, which fits, up to E~ ,-~m~, the photofission cross sections of these three nuclei. PACS: 25.85.Jg

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Future prospects in photon and electron physics at Saclay

Laget

1985

Electron and Photon Interactions at Intermediate Energies

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Pion production off light nuclei

Cited by 12 publications

References 9 publications

Compton scattering by nuclei

Compton scattering by nuclei

Photofission of209Bi,232Th and238U in the quasi-deuteron energy region

Future prospects in photon and electron physics at Saclay

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