High alignment following<sup>219</sup>Rn and<sup>211</sup>Bi decays

Jones, G.D.

doi:10.1088/0954-3899/38/2/025106

Cited by 3 publications

(6 citation statements)

References 13 publications

(71 reference statements)

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“…These assignments are strongly supported by excellent fits to (α-γ ) angular correlation data and to (α-γ ) linear polarization angular distribution data for the 402 keV level [4].…”

Section: Introductionmentioning

confidence: 58%

“…The theoretical coefficients, a K , of α-γ angular correlations can also be factored into two parts, in this case we write [2,4,5,8]…”

Section: α-γ Directional Angular Correlation Theorymentioning

confidence: 99%

“…However, higher L-values are progressively damped by penetration through the α-nucleus Coulomb barrier so usually only the two lowest possible values are considered. In this case the population parameters are given by [2,4]…”

Section: α-γ Directional Angular Correlation Theorymentioning

confidence: 99%

“…is the ratio of the amplitudes of the partial waves and ≈ σ 4 − σ 2 + nπ is the relevant phase between waves of angular momentum 2 and 4 where σ 2 and σ 4 are Coulomb phases [2,4,5].…”

Section: α-γ Directional Angular Correlation Theorymentioning

confidence: 99%

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Identification of spin relaxation following α-decay in odd-Anuclei

Jones¹

2014

J. Phys. G: Nucl. Part. Phys.

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A novel graphical method has been devised for [A + 4] (J P ) α −→ A * (J 1 ) γ −→ A (J 2 ) decay, in odd-A nuclei, when J P < J 1 , to determine whether spin relaxation in the state of spin J 1 has occurred. For a short lived excited daughter state A * of spin J 1 , its populated magnetic substates, following α-decay from a parent nucleus [A + 4] of spin J P , should be restricted to those of value |M| J P (when J 1 > J P ). However, for longer lived excited states, spin relaxation allows population of J P < |M| J 1 substates. The statistical tensors B 2 and B 4 (or population alignment coefficients) of Rose and Brink can be determined from the measured (non-zero) Legendre polynomial coefficients. These measured B 2 and B 4 can be compared with their theoretical counterparts both for the case when |M| J P and for the case when |M| J 1 . It is then readily apparent, from a graphical examination, whether spin relaxation has occurred or not. The same statistical tensors B 2 and B 4 , also allow one to analyse α-γ directional angular correlations and α-γ linear polarization angular distributions simultaneously, rather than as different data sets. The technique has been applied to the case of 219 Rn J P = 5/2 + α −→ 215 Po * J 1 = 7/2 + γ =271 keV − −−−−−→ 215 Po 9/2 + decay. Spin relaxation of the 271 keV state (T 1 / 2 ≈ 0.2 ns) allowing population of substates with |M| 7/2, is required to satisfactorily fit the published data. The population of the M = ±7/2 substates due to spin relaxation is estimated to be less than 20% of the total, equally split between the two.

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“…These assignments are strongly supported by excellent fits to (α-γ ) angular correlation data and to (α-γ ) linear polarization angular distribution data for the 402 keV level [4].…”

Section: Introductionmentioning

confidence: 58%

“…The theoretical coefficients, a K , of α-γ angular correlations can also be factored into two parts, in this case we write [2,4,5,8]…”

Section: α-γ Directional Angular Correlation Theorymentioning

confidence: 99%

Section: α-γ Directional Angular Correlation Theorymentioning

confidence: 99%

Section: α-γ Directional Angular Correlation Theorymentioning

confidence: 99%

See 2 more Smart Citations

Identification of spin relaxation following α-decay in odd-Anuclei

Jones¹

2014

J. Phys. G: Nucl. Part. Phys.

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show abstract

“…Substate populations have also been determined since they may be useful in directing nuclear structure calculations towards oblate or prolate deformations [7], for the states studied.…”

Section: Introductionmentioning

confidence: 99%