Resonances in alpha-nuclei interaction

Karpeshin, F. F.; Larana, G.; Vardaci, E.; Brondi, A.; Moro, R.; Abramovich, S.N.; Serov, V.I.

doi:10.1088/0954-3899/34/3/016

Cited by 12 publications

(7 citation statements)

References 11 publications

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“…At these energies the density of the wave function of the incident particle inside the well reaches a maximum, while the scattering crosssection attributes a bump with the width Γ . This is well illustrated for the scattering of -particles by numerical calculations [28]. Furthermore, if there is an -wave packet inside the nucleus at = 0, which is spread in the energy interval Δ ≫ Γ and is concentrated at the resonance energy , then it exponentially decays later with the lifetime = /Γ [27].…”

Section: Discussionmentioning

confidence: 70%

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Consistent Theory of Alpha-Decay

Dzyublik

2021

Ukr. J. Phys.

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In the framework of the Goldberger–Watson decay theory, we consider the a-decay of nuclei as a transition between the initial bound state of the nucleus and scattering states of the continuum spectrum with a-particle. The scattering wave functions for the a-decay with arbitrary orbital angular momentum are derived in the quasiclassical approximation. The a-particle is described by the square-integrable wave packet formed by these functions, whose amplitude exponentially grows outside the nucleus up to the wave front. The Moshinsky’s distortions of the a-wave front are analyzed. The derived general expression for the decay rate is approximated by the quasiclassical formula.

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Section: Discussionmentioning

confidence: 70%

“…[27]). For -particles, the features of such a resonant scattering have been analyzed by Karpeshin et al [28].…”

Section: Introductionmentioning

confidence: 99%

Consistent Theory of Alpha-Decay

Dzyublik

2021

Ukr. J. Phys.

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“…4) Результаты настоящей работы интересны и для экспериментов (n, α), подобных [23], с мэвными нейтронами. В таких экспериментах могла бы проявиться резонансная структура в спектре α-частиц, предсказанная в работах [16,24,25]. Формулу (9) можно трактовать как прохождение α-частицей того же самого барьера, что и для голого ядра, но с переменной энергией Q α − ∆ǫ(R).…”

Section: заключениеunclassified

Towards experimental search for the atomic effect in alpha decay: comparison of the adiabatic approach with the frozen shell model

Karpeshin¹,

Trzhaskovskaya²

2015

Preprint

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We study the important for the experiment features of the effect of the electron shell on α decay in the adiabatic approach. The effect is of tenths of a percent or less in magnitude, depending on the transition energy and the atomic number. On the other hand, we show the predominant role of the inner shells: more than 80 % of the effect are due to the 1s electrons. This fact is crucial for the experiment, allowing one to perform measurements in the same storage rings, comparing for example, the probability of decay in the bare nuclei and Helium-like ions. The analysis is presented concerning the reasons for the relative success and the limits of applicability of the model of "frozen" electron shell used to calculate the effect for more than half a century.

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“…In scattering, many people put attention to different aspects of internal mechanisms, nucleon-nucleon relations, structure in α-nucleus interactions (for example, see Refs. [97,98]). Understanding of clusters in nuclei is hot topic, it finds its natural place in investigations of scattering.…”

Section: Introductionmentioning

confidence: 99%

Search of cluster structure in nuclei via analysis of bremsstrahlung emission

Maydanyuk¹,

Zhang²,

Zou³

2019

Preprint

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We investigate emission of bremsstrahlung photons during scattering of α-particles off nuclei. For that, we construct bremsstrahlung model for α-nucleus scattering, where a new formalism for coherent and incoherent bremsstrahlung emissions in elastic scattering and mechanisms in inelastic scattering is added. Basing of this approach, we analyze experimental bremsstrahlung cross-sections in the scattering of α-particles off the 59 Co, 116 Sn, nat Ag and 197 Au nuclei at 50 MeV of α-particles beam measured at the Variable Energy Cyclotron Centre, Calcutta. We observe oscillations in the calculated spectra for elastic scattering for each nucleus. But, for 59 Co, 116 Sn and nat Ag we obtain good agreement between calculated coherent spectrum with incoherent contribution for elastic scattering with experimental data in the full photon energy region. For heavy nucleus 197 Au we find that (1) Oscillating behavior of the calculated spectrum of coherent emission in elastic scattering is in disagreement with experimental data, (2) Inclusion of incoherent emission improves description of the data, but summarized spectrum is in satisfactory agreement with the experimental data. To understand unknown modification of wave function for scattering, we add new mechanisms of inelastic scattering to calculations and extract information about unknown new amplitude of such mechanisms from experimental data analysis. This amplitude has maxima at some energies, that characterizes existence of states of the most compact structures (clusters) in nucleus-target. We explain origin of oscillations in the bremsstrahlung spectra for elastic scattering (at first time). New information about coherent and incoherent contributions is extracted for studied reactions.

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Resonances in alpha-nuclei interaction

Cited by 12 publications

References 11 publications

Consistent Theory of Alpha-Decay

Consistent Theory of Alpha-Decay

Towards experimental search for the atomic effect in alpha decay: comparison of the adiabatic approach with the frozen shell model

Search of cluster structure in nuclei via analysis of bremsstrahlung emission

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