Excitation energy of spontaneously fissioning isomer 242mAm

Флеров, Г.Н.; Pleve, A.A.; Polikanov, S.M.; Tretyakova, S.P.; Martalogu, N.; Poenaru, D. N.; Sezon, M.; Vilcov, I.; Vilcov, N.

doi:10.1016/0375-9474(67)90498-8

Cited by 43 publications

(2 citation statements)

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“…They are denoted with a superscript f. A scientific cooperation with a romanian team (N. Vîlcov et al) was started in 1964 in order to produce and measure fissioning isomers at the cyclotron in Magurele near Bucharest, e.g. (Flerov, Ivanov, Martalogu, Pleve, Polikanov, Poenaru, & Vilcov, 1965a;Flerov, Ivanov, Martalogu, Pleve, Polikanov, Poenaru, & Vilcov, 1965b;Flerov, Martalogu, Pleve, Polikanov, Poenaru, & Vilcov, 1967b;Flerov, Pleve, Polikanov, Tretyakova, Martalogu, Poenaru, Sezon, Vilcov, & Vilcov, 1967a).…”

Section: Fissioning Shape Isomersmentioning

confidence: 99%

Short History of Nuclear Decays Including Nuclear Fission

Poenaru¹,

Gherghescu²,

Hamilton³

et al. 2022

AHS

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A short history of the different kinds of nuclear decay modes (α decay, β decay, γ decay, induced fission, spontaneous fission, ternary and multi-cluster fission, fissioning shape isomers, and cluster radioactivities) is presented below, showing how the important research activities at the end of 19th century and the beginning of the 20th one, lead to the discovery of atomic nucleus by Ernest Rutherford in 1911. We shall start with X-rays-a precursor of all these phenomena. The first observation of alpha-, beta-, and gamma radiations was made by Antoine Henri Becquerel in 1896, who observed that beta-rays are deviated by a magnetic field. Marie and Pierre Curie coined the name radioactivity after they produced two new elements: polonium and radium. Alpha particles were first described in the investigations of radioactivity by Ernest Rutherford in 1899, and by 1907 they were identified as He 2+ ions. In 1928, George Gamow had solved the theory of alpha decay via tunneling through a potential barrier. The alpha particle is trapped in a potential well by the nucleus. According to the principles of quantum mechanics, it has a small probability of tunneling through the barrier and escape from the nucleus. Gamow solved a model potential for the nucleus and derived, from first principles, a relationship between the half-life of the decay, and the energy of the emission, which had been previously discovered empirically, and was known as the Geiger-Nuttall law.

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Section: Fissioning Shape Isomersmentioning

confidence: 99%

Short History of Nuclear Decays Including Nuclear Fission

Poenaru¹,

Gherghescu²,

Hamilton³

et al. 2022

AHS

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“…The nuclear structure is still not understood adequately. For example, it is still difficult to reproduce the nuclear masses on the entire nuclear table . As an example of a strange experimental behavior is the discovery of an isomer in americium [13,14] together with the presence of intermediate structures in the fission cross sections [15,16,17]. These strange behavior were not explained until the postulation of a double humped fission barrier.…”

Section: Brief Historymentioning

confidence: 99%

Notes on Fission Dynamics

Mirea¹

2020

AnnalsARSciPhysChem

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The dynamics of the nuclear fission is a complex phenomenon, being not yet described adequately from the theoretical point of view. At present, they are not models giving a complete description of the richness of the features which characterizes this phenomenon. It is the mean reason for which I called this paper Notes on Fission Dynamics, being certain that I will not be able to make a global description, but only a picture underlining some particularities. So, this mini-overview should be considered only a part of the collection of articles treating the nuclear physics, published as a special number in the review of the Academy of Romanian Scientists, without an exhaustive character. A theory treating the nuclear fission is by excellence based on quantum mechanics. That is, a theory concerning the interactions between the smallest pieces that constitute a many-body nucleus. But, at present it is not possible to perform ab-initio calculations to describe the many-body structure of heavy nuclei which undergo fission by starting from fundamental interactions. To make the problem tractable, the nucleus as a whole are constrained by some collective parameters, associated to some collective degree of freedom. The collective variables are forced to vary, leading to a scission of the nuclear system. The response of the nuclear system to the external forces is given by the nuclear inertia. The mean field potential between the nucleons is obtained after a proper average, and then used to solve the Schrodinger equation. The treatments presented in this article are based on these simplifying concepts. I will give some examples of calculations that include the dissipation and the configuration mixing due to radial and angular couplings. The importance of the subject is also briefly reviewed.

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The Intermediate State in Fission and Shape Isomers

Sperber

1973

Proceedings of the Europhysics Study Conference on Intermediate Processes in Nuclear Reactions

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Excitation energy of spontaneously fissioning isomer 242mAm

Cited by 43 publications

References 4 publications

Short History of Nuclear Decays Including Nuclear Fission

Short History of Nuclear Decays Including Nuclear Fission

Notes on Fission Dynamics

The Intermediate State in Fission and Shape Isomers

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