Complex Alpha Spectra of Radiothorium (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Th</mml:mi></mml:mrow><mml:mrow><mml:mn>228</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>) and Thorium-X (<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Ra</mml:mi></mml:mrow><mml:mrow><mml:mn>224</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:ma

Asaro, Frank; Stephens, F. S.; Perlman, I.

doi:10.1103/physrev.92.1495

Cited by 69 publications

(30 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Among all the nuclear properties, the octupole deformation is a very important one which attract a lot of attention because the octupole deformation can account for a lot of experimental observations such as the parity doublets [1] and the asymmetric mass distribution observed in the fission of 240 Pu [2] . In the 1950s, people observed in the actinide lowlying bands of excitations with negative parity [3,4] which implies the asymmetric deformations in the ground state [1] . Some nuclei may have a shape asymmetry under spatial reflection, which is usually called "pear shape".…”

mentioning

confidence: 98%

Ground state properties of La isotopes in reflection asymmetric relativistic mean field theory

Wang

Guo

2009

Sci. China Ser. G-Phys. Mech. Astron.

View full text Add to dashboard Cite

The ground state properties of La isotopes are investigated with the reflection asymmetric relativistic mean field (RAS-RMF) model. The calculation results of binding energies and the quadrupole moments are in good agreements with the experiment. The calculation results indicate the change of the quadrupole deformation with the nuclear mass number. The "kink" on the isotope shifts is observed at A = 139 where the neutron number is the magic number N = 82. It is also found that the octupole deformations may exist in the La isotopes with mass number A ∼ 145-155. reflection asymmetric relativistic mean field (RAS-RMF) theory, nuclear deformation, binding energyThe understanding of the nuclear ground state properties such as the binding energy, deformation as well as charge radius is one of the key problems for the nuclear physicists. Among all the nuclear properties, the octupole deformation is a very important one which attract a lot of attention because the octupole deformation can account for a lot of experimental observations such as the parity doublets [1] and the asymmetric mass distribution observed in the fission of 240 Pu [2] . In the 1950s, people observed in the actinide lowlying bands of excitations with negative parity [3,4] which implies the asymmetric deformations in the ground state [1] . Some nuclei may have a shape asymmetry under spatial reflection, which is usually called "pear shape". Microscopically, this kind of shape can be attributed to the coupling between the single particle energy levels which differ by Δl = 3 and Δj = 3. These levels are close to each other near Fermi surface at proton and neutron numbers near 34, 56, 88 and neutron number near 134, where the octupole correlations are expected to be the strongest [5] . In order to understand the nuclear octupole deformation, some theoretical researches are already carried out. The octupole deformations are studied with the macroscopic-microscopic models [6−10] , the non-relativistic Hartree-Fock model with Skyrme III force [11] and a Gogny force [12] as well as the relativistic mean field theory [2,13] . In ref.[9], the equilibrium deformations for some heavy and superheavy nuclei are calculated. It is found that 226 Ra,

show abstract

mentioning

confidence: 98%

Ground state properties of La isotopes in reflection asymmetric relativistic mean field theory

Wang

Guo

2009

Sci. China Ser. G-Phys. Mech. Astron.

View full text Add to dashboard Cite

show abstract

“…The phenomenon of octupole collectivity in atomic nuclei has been a topic of theoretical and experimental investigation for over half a century [1][2][3][4][5][6]. Proton and neutron orbitals with ∆l = ∆j = 3 give rise to an enhancement of the octupole part of the nucleon-nucleon interaction.…”

Section: Introductionmentioning

confidence: 99%

Identification of theJπ=1−state inRa218populated viaα
Parr
¹
,
Smith
²
,
Greenlees
³

et al. 2016
Phys. Rev. C
6
0
10
1
View full text Add to dashboard Cite

The α decay of 222 Th populating the low-lying J π = 3 − state, and also a proposed 1 − state, in 218 Ra has been observed. The observations suggest an excitation energy of 853 keV for the 1 − state, which is 60 keV above the 3 − state. The hindrance factors of these α decays give a possible boundary to the region of ground-state octupole deformation in the light-actinide nuclei. The relative positions of the J π = 1 − and 3 − states suggest they are produced by an octupole-vibrational mechanism, as opposed to α clustering or rotations of a reflection-asymmetric octupole-deformed shape.

show abstract

“…The second requirement cannot be so easily circumvented, and the published techniques for achieving sample thinness vary according to the chemical nature of the element under study. The methods range in complexity from the spontaneous electrodeposition of polonium on silver or copper foil [1] to the distillation of radium at elevated temperatures [2]. Specific procedures for individual radioisotopes have been summarized in a number of publications [3,4,5].…”

Section: Introductionmentioning

confidence: 99%

Preparation of Sources for Alpha Spectrometry

Kirby

Dauby

1966

Radiochimica Acta

View full text Add to dashboard Cite

133Adsorption von Sr-Ionen wird jedoch durch Li-Ionen so wenig beeinflußt, daß man in diesem Fall eine einwandfreie Adsorptionsisotherme erhält. Das gleiche gilt für die Na-Isotherme, bei der N(CH 3 ) 4 OH zur ¡PH-Einstellung verwendet wurde. Für die Cs-Adsorptionsisotherme wurde wie für Sr LiOH benutzt. Die Adsorption von Cs-Ionen wird durch Li-Ionen jedoch erheblich stärker beeinflußt. Man findet daher nur bei sehr niedrigen Cs-Konzentrationen, wo die Kapazität des Ti0 2 · aq durch Cs-Ionen praktisch noch nicht in Anspruch genommen wird, den korrekten Verlauf der Adsorptionsisotherme. Das steht im Einklang mit den Messungen von Z> Cs in Abhängig-keit von dem mit LiOH eingestellten pn-Wert (vgl. Abb. 3), die bis etwa pu 10 kein Abfall des Verteilungskoeffizienten zeigen. Für hohe Cs-Konzentrationen sind die Meßwerte natürlich auch wieder korrekt, da dann der pn-Wert mit CsOH eingestellt wird. Zwischen der log £> Cs -log a Cs -Kurve der Abb. 4 und der Cs-Adsorptionsisotherme besteht offenbar ein Zusammenhang. Im vorigen Abschnitt war gezeigt worden, daß im Bereich des linearen Abfalls von log D Cs das Adsorbens mit Cs-Ionen gesättigt ist. Dieser Teil der Kurve entspricht also dem horizontalen Ast der Adsorptionsisotherme. Von einer gewissen Cs-Aktivität an abwärts muß log D Cs unabhängig von der Cs-Aktivität den Wert annehmen, der für trägerfreie Cs-137-Lösung bei -pn 10 gefunden wurde, nämlich 4,47. Dieser horizontale Teil der Kurve entspricht dem linear ansteigenden Teil der Adsorptionsisotherme, da Cc s proportional der Cs-Aktivität der Lösung ist. Also muß der Schnittpunkt der linear extrapolierten Äste der log Z> Cs -log «cg-Kurve dem Schnittpunkt der linear extrapolierten Äste der Adsorptionsisotherme entsprechen.Ob die gleiche Überlegung auch für log D Cs -log a MeKurven gilt, wurde geprüft, indem die entsprechenden Schnittpunkte der linearen Extrapolationen für die Na-Adsorptionsisotherme und für die log D Cg -log a Na -Kurve verglichen wurden. Tatsächlich liegen auch diese Schnittpunkte bei der gleichen Na-Aktivität, nämlich 8,9 · 10~6. Das bedeutet, daß auch für die log D Cs -\og a Na -Kurve der Bereich des linearen Abfalls dem horizontalen Ast der Na-Adsorptionsisotherme entspricht. Daraus kann man wiederum schließen, daß in diesem Bereich Tf^ konstant ist. Tabelle 2. Konzentrationswerte für A in der Langmnir'sehen Gleichung (8) bei pu 10 aus den log D Cs -log a^-Kurven Me+-Ion Cs K(NH) 4 Na Li [N(CH,) 4 ]A (m) 7,1 . IO"« 1,58 · IO" 6 8,9 . 10"« 2,6 . 10~4 3,5 · IO -* In entsprechender Weise wurden daher auch aus den anderen log D Cs -log a Me -Kurven die A -Werte der MeAdsorptionsisothermen entnommen, vgl. Tab. 2. Wenn man annimmt, daß (c Me ) max für alle Alkalimetalle übereinstimmend 0,20 g-Äqu/Mol Ti0 2 beträgt, kann man aus den log D Cs -log a Me -Kurven die vollständigen Me-Adsorptionsisothermen berechnen. SummaryA simple method is presented for the preparation of alpha sources to be analyzed by an alpha spectrometer equipped with a semi-conductor detector. The procedure consists of evaporating t...

show abstract

Complex Alpha Spectra of Radiothorium (Th228) and Thorium-X (Ra224

Cited by 69 publications

References 11 publications

Ground state properties of La isotopes in reflection asymmetric relativistic mean field theory

Ground state properties of La isotopes in reflection asymmetric relativistic mean field theory

Identification of theJπ=1−state inRa218populated viaα
Parr
¹
,
Smith
²
,
Greenlees
³

et al. 2016
Phys. Rev. C
6
0
10
1
View full text Add to dashboard Cite

Preparation of Sources for Alpha Spectrometry

Contact Info

Product

Resources

About

Complex Alpha Spectra of Radiothorium (Th228) and Thorium-X (Ra224

Cited by 69 publications

References 11 publications

Ground state properties of La isotopes in reflection asymmetric relativistic mean field theory

Ground state properties of La isotopes in reflection asymmetric relativistic mean field theory

Identification of theJπ=1−state inRa218populated viaαParr1, Smith2, Greenlees3 et al. 2016Phys. Rev. C60101View full textAdd to dashboardCite

Preparation of Sources for Alpha Spectrometry

Contact Info

Product

Resources

About

Identification of theJπ=1−state inRa218populated viaα
Parr
¹
,
Smith
²
,
Greenlees
³

et al. 2016
Phys. Rev. C
6
0
10
1
View full text Add to dashboard Cite