The Giant Dipole Resonance

Spicer, B.M.

doi:10.1007/978-1-4684-8343-7_1

Cited by 28 publications

(2 citation statements)

References 126 publications

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“…Except for overrated TENDL data of (γ,n) cross-section at a high energy tail, most of the experimental data for (γ,n) and (γ,2n) reactions are within one standard deviation of the TENDL data. While nuclear reaction modelling codes including TALYS generally provide rather uncertain parameters for photonuclear reactions, it is known that the parameter of giant dipole resonance (GDR) reactions such as (γ,xn) of heavy nuclides is slowly varying with the atomic mass number and the deviation from one nuclide to another is rather small 19 – 21 . Therefore, a GDR cross-section of a nuclide can be well predicted based on the experimental data of neighboring nuclei.…”

Section: Methodsmentioning

confidence: 99%

Feasibility of a novel photoproduction of 225Ac and 227Th with natural thorium target

Kim

2022

Sci Rep

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We propose an innovative way to produce both 225Ac and 227Th, two precious radioisotopes enabling promising targeted alpha therapy, in a natural thorium target bombarded with a 30–90 MeV electron beam. Bremsstrahlung photons in the target are analyzed by MCNP and in-situ photonuclear transmutation of 232Th is evaluated by using the TENDL nuclear data. In the photo-transmutation analysis, 13 nuclides including 229Th and 231Pa are modelled. Special procedures with chemical separations are also proposed to produce pure 225Ac and 227Th in separate streams. In addition, performance of the new approach is compared with conventional methods in terms of the 225Ac and 227Th yields. After a Th target is bombarded with a 500 kW electron beam for a year, yearly 225Ac yield is ~ 8.47 GBq (semi-permanently) and yearly 227Th yield is ~ 48.9 GBq over 50 years, and their yields are at least doubled in a 2-year irradiation. This work will help increase global supply of the two precious isotopes and would invariably help advance TAT-related researches and developments.

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Section: Methodsmentioning

confidence: 99%

Feasibility of a novel photoproduction of 225Ac and 227Th with natural thorium target

Kim

2022

Sci Rep

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“…These peaks are lied in about 15-25 MeV energy range with about 3-10 MeV peak width. The resonance is originated from collective motion of the nucleon inside the nucleus (Spicer, 1969). The GDR were first observed by Bothe andGentner in 1937 (Bothe ve Gentner 1937) and the existence of this resonance were shown first by Baldwin and Klaiber (1948) in photonuclear reactions.…”

Section: Introductionmentioning

confidence: 94%

Giant Dipole Resonence Energy Predictions For 116,117,118,119,120,124Sn and 233,234,235,236,238U Isotopes

Akkoyun¹,

Bayram²,

Özgüven³

2017

AKU-J. Sci. Eng.

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Anahtar kelimelerDev dipol rezonans, E1 geçişi, yapay sinir ağları ÖzetDev dipol rezonans (GDR) parametrelerini elde etmek için birçok deneysel ve teorik metot uygulanmaktadır.Bu çalışmada, Sn ve U izotopları için GDR enerjileri, yapay sinir ağları (YSA) metodu ile tahmin edilmiştir. Sonuçlara göre, YSA'nın eğitiminde deneysel verilerden ortalama sapma, %1 seviyesindedir. Sn ve U izotopları için tahmin edilen enerjilerdeki ortalama kare hata, 0,034 MeV'dir.Teorik bir model için ise hata, 0,061 MeV'dir.Bu sonuç, GDR enerjileri üzerinde ANN tahmininin, teorik hesaplamalardaki sonuçlardan daha iyi olduğunu göstermektedir. Giant Dipole Resonence Energy Predictions AbstractSeveral experimental and thoretical methods are applied for obtaining giant dipole resonance (GDR) parameters. In this study, GDR energies for Sn and U isotopes have been predicted by using artificial neural network (ANN) method. According to the results, in the training of the ANN, the mean deviations from the experimental values are in the order of 1%. The mean square error for the estimated energies of Sn and U isotopes is 0.034 MeV. Similar error value belonging to a theoretical model calculation is 0.061 MeV. This result indicates that ANN predictions on GDR energy give better results according to the theoretical results.

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Collective excitations of nuclear matter

Haensel

1976

Z Physik A

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The Giant Dipole Resonance

Cited by 28 publications

References 126 publications

Feasibility of a novel photoproduction of 225Ac and 227Th with natural thorium target

Feasibility of a novel photoproduction of 225Ac and 227Th with natural thorium target

Giant Dipole Resonence Energy Predictions For 116,117,118,119,120,124Sn and 233,234,235,236,238U Isotopes

Collective excitations of nuclear matter

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