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Bargholtz, Chr.; Becker, J.; Beshai, S.; El-Khosht, M.; Fransson, K.; Sundström, B.

doi:10.1103/physrevc.21.1078

Cited by 3 publications

(5 citation statements)

References 12 publications

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“…We conclude that no discrepancy between experiment and theory is found in the present investigation. The reason for the discrepancy [6] for the 1178 keV 7 -L~ correlation in 16~ a case which at least from the theoretical point of view is similar to the present, is still unclear.…”

contrasting

confidence: 43%

“…Thus, no explanation for the anomalous gammax-ray result in [6] was found in the electron x-ray directional correlations. In this work another case of gamma -x-ray correlations is studied.…”

Section: Introductionmentioning

confidence: 69%

“…Anisotropic correlations were found between gamma rays and x-rays in 16~ in the radioactive decay of 16~ [6]. Directional correlations between 1178 keV gamma rays and x-rays following internal conversion of the 86.78keV ground state transition were measured.…”

Section: Introductionmentioning

confidence: 99%

“…Directional correlations between radiation emitted in a nuclear transition and x-rays associated with internal conversion have been investigated in this laboratory [6,7] (references to earlier experimental work are given in [6]). Anisotropic correlations were found between gamma rays and x-rays in 16~ in the radioactive decay of 16~ [6].…”

Section: Introductionmentioning

confidence: 99%

“…In this work another case of gamma -x-ray correlations is studied. As in the former work [6] the converted transition is chosen to be of E2 type, namely the ground state transition of 100.1 keV in 182W.…”

Section: Introductionmentioning

confidence: 99%

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Gamma-ray-L-x-ray directional correlations in182W

Bargholtz

Holmberg

Tegnér

1987

Z. Physik A - Atomic Nuclei

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Directional correlations between gamma radiation and L x-rays in 182W have been measured. The x-rays are emitted following the internal conversion process of the 100.1 keV 2 + ~ 0 + transition. The experimental results for anisotropies involving gamma radiation emitted in the 1189.0 keV transition and L x-rays are A(7-Lt)=-0.073(27), A(7-L~)=-0.0102(45), A(y-Lp)=-0.0031(35), and A(y-L~)=--0.007(13). The value deduced for the coefficient U2(e) pertaining to the converted transition is U2(e)=0.52 (8) in reasonable agreement with the theoretically expected value 0.410. A note is given on the use of internal conversion radial matrix elements.

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contrasting

confidence: 43%

Section: Introductionmentioning

confidence: 69%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Gamma-ray-L-x-ray directional correlations in182W

Bargholtz

Holmberg

Tegnér

1987

Z. Physik A - Atomic Nuclei

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Angular correlation ofK-Lx-ray cascades in gadolinium

Papp¹,

Jl²,

Raman³

1994

Phys. Rev. A

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Directional correlation between α particles andLx rays in the decay ofPu238and
Johnston¹
1991
Phys. Rev. C
6
0
2
1
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Anisotropy in the directional correlation of nuclear radiations and L x rays has been clearly identified for the first time. L3 x-ray groups, LI and La, are observed to be directionally correlated with a particles in the decays of Pu and Cm. The ratio of anisotropy for LI and La is consistent with the recent observation that LI has a much greater admixture of M2 than predicted by relativistic calculations.Several attempts to demonstrate directional correlation between nuclear radiations and L x rays have been reported [1-8]. Anisotropy has not been clearly established in any of these studies. Most recently, Bargholtz et al. [8] reported statistical evidence of a very small directional correlation between y rays and La in the decay of ' Tb. The ratio of directional correlation of the Lt and La groups was interpreted as being anomalous. The results are inconclusive and difficult to explain.Directional correlations between nuclear radiations in cascade in nuclear deexcitation (e.g. , radioactive decay) are well understood [9], as are the directional correlations between x rays in cascade in atomic deexcitation [10].The directional correlation between nuclear radiations and x rays in cascade has received less attention. Dolginov [11] gave a theoretical description of the correlation between nuclear radiations and x rays; however, with little experimental data available for comparison, the theory remains largely untested. Only cascades in which the intermediate states have total angular momentum J ) -, ' allow anisotropic directional correlation. Consequently the most tightly bound subshell that is expected to support anisotropic directional correlation is the Li(2p3I2) subshell. The L x-ray spectrum cannot be fully resolved, but falls into four groups of lines that can be resolved. Lt and La groups are due to the transitions L3 Mt and L3 M45, respectively, and therefore are expected to show if directional correlation is present. LP is due to transitions from all subshells thus diluting any directional correlation, while Ly is due to transitions from the Lt (2stiq) and L2 (2ptlq) subshells and should be isotropically distributed relative to nuclear emissions as should x-rays from the K (ls &I2) shell. However, Khalil [12] has described J )1 admixtures into the K (1s&I2) shell of atoms with highly deformed nuclei which contribute to anisotropic directional correlation between y rays and K x rays in the decay of ' 'Ta. The anisotropic angular distribution of L3 x rays of Th and U following proton ionization has recently been used by Papp et al. [13] to demonstrate deficiencies in the theoretical description of Scofield [14] of the multipolarity of LI. In the present work, the directional correlation between a particles and L x rays in the decays of Pu and Cm arises predominantly from the triple cascade; a decay to the first excited state of the daughter nucleus followed by internal conversion of an E2 electromagnetic transition and x-ray emission: nuclear angular momentum atomic angular momentum 6 e-0+ 2+ 0+ X 0 3/2

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Anomalous gamma-ray—L-x-ray directional correlations inDy160

Cited by 3 publications

References 12 publications

Gamma-ray-L-x-ray directional correlations in182W

Gamma-ray-L-x-ray directional correlations in182W

Angular correlation ofK-Lx-ray cascades in gadolinium

Directional correlation between α particles andLx rays in the decay ofPu238and
Johnston¹
1991
Phys. Rev. C
6
0
2
1
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Anomalous gamma-ray—L-x-ray directional correlations inDy160

Cited by 3 publications

References 12 publications

Gamma-ray-L-x-ray directional correlations in182W

Gamma-ray-L-x-ray directional correlations in182W

Angular correlation ofK-Lx-ray cascades in gadolinium

Directional correlation between α particles andLx rays in the decay ofPu238andJohnston1 1991Phys. Rev. C6021View full textAdd to dashboardCite

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Directional correlation between α particles andLx rays in the decay ofPu238and
Johnston¹
1991
Phys. Rev. C
6
0
2
1
View full text Add to dashboard Cite