Preequilibrium proton decay in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>40</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Ca

Ceneviva, Carina; Teruya, N.; Dias, H.; Hussein, M. S.

doi:10.1103/physrevc.55.1246

Phys. Rev. C

1997

DOI: 10.1103/physrevc.55.1246

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Preequilibrium proton decay in40Ca

Carina Ceneviva

N. Teruya

H. Dias

et al.

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Cited by 5 publications

(3 citation statements)

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“…For neutron emission, experience has shown that besides the compound decay, there is also a preequilibrium component. [7,8] Denoting the branching ratio by B r i→n = T r i→n T r i→f f , with T denoting the appropriate transmission coefficient for the n-decay of state i d 2 or d * through compound or preequilibrium configuration (r), we can write for neutron emission.…”

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“…where we have made use of Eq. (8). We now use the fact the the branching ratio for compound γ emission is much smaller than that for direct emission, B dir d→γ >> B comp d→γ , to neglect the fluctuation term, which yields,…”

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confidence: 99%

“…For neutron emission, experience has shown that besides the compound decay, there is also a preequilibrium component. [7,8] Denoting the branching ratio by B r i→n =…”

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Decay theory of double giant resonances

1998

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The decay theory of double giant resonances incorporating fluctuation contributions of the BrinkAxel type is developed. The γ and neutron emission decay of Double Giant Dipole Resonances (DGDR) in 208 Pb is discussed in connection with a recent measurement. * Supported in part by FAPESP. * * Supported in part by CNPq.Recently, the decay properties of the double giant dipole resonance (DGDR) in several nuclei has been investigated experimentally in Coulomb excitation reactions at high energies [1]. In particular, the neutron-and γ-decay channels were looked at in Ref. [2]. In analysing the data, the authors rely on a model for the formation of the DGDR that involves the sequential excitation of the two phonon state through the one phonon state. Although it is concluded that the decay of the two phonons seem to follow the harmonic model (namely the two phonons decay independently from each other), we believe that a component essential to the analysis is missing, since the integrated cross sections obtained from the decay data deviate appreciably from the harmonic coupled channel calculations. The purpose of this paper is to develop a new model for the decay of the DGDR using the recently developed Direct + Fluctuation (DF) model of Ref. [3,4] which reproduces the cross section value. We first give a brief description of the DF model. It is argued in Ref. [3] that besides the, direct, g.s. → one-phonon → two-phonon transition, there is another contribution that arises from the coupling of the one-phonon state to the complex background states followed by the excitation of a Brink-Axel phonon.[5] The general structure of the two-step amplitude iswhere G i is the propagator in the region of the GDR, d and b are projectors for the one phonon collective states and for the background states responsible for the damping of the collective states respectively. In writing Eq. (1) it is being assumed that the interaction V i0 , when acting on the initial state, will not excite the background states appreciably. These states will however be reached through the damping mechanisms present in G i , and will thus participate actively in the second step. We next think of the propagator G i as split into a sum of average parts which are essentially diagonal in the subspaces b and d,Ḡ b andḠ d (with complex Q-value), plus an additional fluctuation part with zero average. Thusand the transition amplitude is similarly split as and the average cross section becomesσ

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Decay theory of double giant resonances

1998

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Decay of 1, 2 and 3-phonon states in 40Ca

et al. 2007

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Statistical calculations of the damping width of giant resonances

et al. 1998

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Preequilibrium proton decay in40Ca

Cited by 5 publications

References 30 publications

Decay theory of double giant resonances

Decay theory of double giant resonances

Decay of 1, 2 and 3-phonon states in 40Ca

Statistical calculations of the damping width of giant resonances

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