Barrier penetrabilities and the alpha-nucleus potential

Bencze, G.; Săndulescu, A.

doi:10.1016/0031-9163(66)91231-5

Cited by 14 publications

(2 citation statements)

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“…Recent calculations carried out in parallel with ours find, as we do, that about an order-ofmagnitude better agreement with the empirical decay rates can be obtained by a direct calculation of the nuclear penetrabilities than by the use of the JWKB estimates (Bencze and Sandulescu 1966). It has also been shown that the nonlocal nature of the average interaction between the decay products might lead to a further increase in the penetrabilities (Bencze 1967).…”

Section: Introductionsupporting

confidence: 59%

On alpha-decay rates in heavy nuclei

Scherk¹,

Vogt²

1968

Can. J. Phys.

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The alpha-decay rates in heavy nuclei are analyzed by a method in which the decay rates are factored into one-body widths and spectroscopic factors. It is shown that the discrepancy between the absolute values of the experimental alpha-decay rates and those calculated with the nuclear shell model has mainly resided in the incorrect assessment of the one-body widths and that it can be largely removed by a more direct treatment of the average interaction between the alpha particle and the residual nucleus.

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Section: Introductionsupporting

confidence: 59%

On alpha-decay rates in heavy nuclei

Scherk¹,

Vogt²

1968

Can. J. Phys.

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“…Thus one can relate the irregular widths to experimental facts and to a ratio of penetrabilities. The latter do not depend strongly on R and the particle potential, 6 and therefore (5) is very accurate. In the case of the 8.88-MeV level the situation is slightly more complicated.…”

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confidence: 95%

Parity-Forbidden Alpha Decay of SomeO16Levels

Gari

Kümmel

1969

Phys. Rev. Lett.

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The theory of the parity-nonconserving alpha decays from the 2~ (8.88 MeV), 0" (10.937 MeV), and 3 + (11.05 MeV) O 16 levels is developed. Using the weak nucleon-nucleon interaction of Blin-Stoyle and Herczeg and known O 16 wave functions modified by short-range correlations via the Bethe-Golds tone equation, the irregular alpha widths have been related to known regular widths. The influence by the hard core of the strong interaction has been studied.Measurements of alpha particles produced by the parity-nonconserving weak interaction are under way. 1 Although having the disadvantage of being second order in the weak-coupling constant G 9 there are also some advantages over the polarization measurements, 2 "" 4 which are of first order in G. Some of the corresponding irregular widths are as small as 10~1 3 keV. Yet with experimental techniques presently available one is able to measure this small quantity with reasonable accuracy-better than just the order of magnitude. The theory is relatively simple and reliable, since the irregular widths r irr can be related to known regular widths r reg . Also, the proportionality to G 2 yields a stronger dependence of the result on the details of the weak interaction, such that one possibly can decide whether the conserved-vector-current (CVC) theory is valid or not.We have computed the admixtures of "wrong parity" to the O 16 states 2" at 8.88 MeV and 0" at 10.937 MeV (and estimated the same for the 3 + state at 11.05 MeV). This admixture, e.g., to the state 8.88, is given by with (z,2lF w^| 8.88 ? 2-> £,.-£(8.8)Now, using the basic formula 5 for the a?-decay width[with R~ sum of daughter and a -particle radii, P L (E,R) = penetrability for angular momentum L], one obtains the irregular width :^lE^/| (4)

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Theories of alpha-decay

Jackson

Rhoades‐Brown

1977

Annals of Physics

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Barrier penetrabilities and the alpha-nucleus potential

Cited by 14 publications

References 8 publications

On alpha-decay rates in heavy nuclei

On alpha-decay rates in heavy nuclei

Parity-Forbidden Alpha Decay of SomeO16Levels

Theories of alpha-decay

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