Isospin effect in photoproton reaction on heavy nuclei

Shoda, K.

doi:10.1016/0370-1573(79)90048-6

Cited by 33 publications

(8 citation statements)

References 52 publications

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“…2. The results for r pn = Np Nn vary smoothly from 1 in 12 C and 16 O to 3.5 in 40 Ca, in good agreement with the σ(γ,p) σ(γ,n) trend although not with the magnitude. In fact, it is known that the Np Nn ratio is representative of σ(γ,p) σ(γ,n) for the lower energy half of the GDR and it is associated with the statistical nature of the levels in the residual nuclei [24].…”

Section: Open Channelssupporting

confidence: 62%

“…Instead, isospin symmetry is broken by the Coulomb force and the sum rules for transition strengths, shown in Fig. 3, favors the (γ, p) decay from the T = 1 resonance [40,60]. This, together with the fact that neutron emission to the T = 1/2 residual states is highly suppressed because of their expected high excitation energies -i.e.…”

Section: Isospin Selection Rulesmentioning

confidence: 98%

“…2. Isospin selection rules favor proton decay -as explained below -from the decay of the isospin T = 1 GDR resonance [24,[37][38][39][40].…”

Section: Testing Groundmentioning

confidence: 99%

“…Table I and Fig. 2 show the empirical r pn values (squares) for A = 4n self-conjugate nuclei from 12 C to 40 Ca. The consistency of data is crucial for this analysis and generally involve the selection of at least two experiments and an upper limit of integration of the cross sections set to 30 MeV [48,49]; except for 20 Ne, where (γ, p) and (γ, n) contributions were evaluated from the same experiment [45].…”

Section: Testing Groundmentioning

confidence: 99%

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Competition between $(γ,p)$ and $(γ,n)$ photo-disintegration yields

Orce

2021

Preprint

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A comprehensive analysis of the competition between photo-proton and photo-neutron disintegration yields is undertaken by constraining photo-absorption data with physics principles -namely, dipole sum rules, decay properties to open channels, isospin selection rules and statistical evaporation from compound nucleus formation. The trend and magnitude of disintegration yields for self-conjugate nuclei are in agreement with the evaporation model of Blatt and Weisskopf. A substantial improvement is found between the exponential trend presented in this work and that determined by Morinaga using a similar approach. This work allows for the evaluation of frequently missing or inconsistent photo-proton contributions, which impacts the photo-disintegration of light and neutron-deficient nuclei, where photo-proton contributions are relevant.

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Section: Open Channelssupporting

confidence: 62%

Section: Isospin Selection Rulesmentioning

confidence: 98%

“…2. Isospin selection rules favor proton decay -as explained below -from the decay of the isospin T = 1 GDR resonance [24,[37][38][39][40].…”

Section: Testing Groundmentioning

confidence: 99%

Section: Testing Groundmentioning

confidence: 99%

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Competition between $(γ,p)$ and $(γ,n)$ photo-disintegration yields

Orce

2021

Preprint

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“…The (n,p) charge exchange reaction (85) excites numerous spin-fl ip transitions, which severely hinder the data analysis. The failure of electron scattering (86) to see the isovector monopole is more subtle. Because the electron is a weak…”

Section: Giant Isovector Monopole Resonancementioning

confidence: 99%

Pion-Nucleus Interactions

Gibbs¹,

Gibson²

1987

Annu. Rev. Nucl. Part. Sci.

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Microscopic Studies of Electric Dipole Resonances in 1p Shell Nuclei

1987

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Recent data on total and partial photonuclear cross sections in the GDR region of the nuclei 6Li to 16O are compared with theoretical predictions, mostly from shell model and continum shell model studies. The influence of the size of the configuration space, of the adopted residual interaction and of the continuous spectrum on the isovector E1 response is discussed to some detail. The observed trends of the localization, the shape and width, the isospin and the configurational structure of the GDR with increasing 1p shell occupation are related to the microscopic structure of the nuclear ground state. Particular attention is given to the partial (γ, Ni) disintegration channels. Complex‐particle emission and isospin mixing in the nuclear states are discussed for a few cases. An attempt is made to bring some systematics also in the evidence on excited‐state giant resonances through the 1p shell region. The photonuclear GDR is compared with other giant multipole excitations, mostly for the example of the 14C nucleus.

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Isospin effect in photoproton reaction on heavy nuclei

Cited by 33 publications

References 52 publications

Competition between $(γ,p)$ and $(γ,n)$ photo-disintegration yields

Competition between $(γ,p)$ and $(γ,n)$ photo-disintegration yields

Pion-Nucleus Interactions

Microscopic Studies of Electric Dipole Resonances in 1p Shell Nuclei

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