Beta-Gamma Directional Correlation in the Decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="normal">Eu</mml:mi></mml:mrow><mml:mrow><mml:mn>152</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>

Dulaney, Harry; Braden, C. H.; Wyly, L. D.

doi:10.1103/physrev.117.1092

Cited by 16 publications

(4 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10 There beta-gamma directional correlation. [11][12][13][14] Unfortunately, the reported measurements do not agree within the quoted error limits. For this reason, we felt it necessary to embark on a new measurement of the Eu 152 betagamma directional correlation.…”

Section: Introductionmentioning

confidence: 86%

Nuclear Matrix Elements in the First-Forbidden Beta Decay of theEu152Ground State

Alexander

Steffen

1962

Phys. Rev.

View full text Add to dashboard Cite

The degree of circular polarization P c (6p y ) and the directional correlation W(0p y ) = 1+^2(^)^2(00^7) were measured in the 3~(1.49-MeV jS~) -> 2 + (0.344-MeV 7) ->0 + /3-7 cascade leading from the ground state of Eu 152 to the Sm 152 ground state. The angle d$ y is the angle between the £ and 7 momentum vectors. Representative values of P c (0p y ) measured at W=3.20 (in units mc 2 ) for some average angles 6$ y are: P c (90°) = -0.01=b0.09, P c (130°) = +0.33±0.07, P c (157°)-0.33±0.07, P«(171°)=0.24±0.10. Some representative values of the directional correlation coefficient Az^W) are: ^2(2.8) = -0.335±0.006, ^4 2 (3.15) = -0.363dr0.006, A 2 (3A) = -0.381±0.005, 4 2 (3.7) = -0.388±0.004. The data were analyzed on an electronic digital computer on the basis of the Kotani parameters Y, u, x, and z. Information obtained about the nuclear matrix parameters may be summarized as follows: F=0.70db0.20, #=0.125±0.06, w=0.125db0.06, 3 = 1.0. Taken jointly with theft value of the 1.49-MeV (3 transition these parameters yield the nuclear matrix elements: y%/P = ±(2.9±0.4)X10~3, ,A/P==±(4.3rb2.3)XlO-4 , fioXr/R=*±(3.6±L9)XlO-*, y7a = :±:(2.5=fc:l.l)X10~4, where R is the nuclear radius of Eu 152 in units of h/tnc. These results reveal the importance of J* By relative to the other nuclear matrix elements which contribute to the decay. The experimental value of the matrix element ratio fiw.1 ft agrees with the prediction of the conserved vector current theory of beta decay.

show abstract

Section: Introductionmentioning

confidence: 86%

Nuclear Matrix Elements in the First-Forbidden Beta Decay of theEu152Ground State

Alexander

Steffen

1962

Phys. Rev.

View full text Add to dashboard Cite

show abstract

“…Thus this beta decay is highly K forbidden, which may very well account for the validity of the "modified Bij approximation." An identical beta transition of 1483 kev in Eu 152 has also the similar property in that the Bij matrix element is predominant [9][10][11][12] ; however, in this case the ^-selection rule effect is untenable because the 344-kev level in Gd 152 is a vibrational state of a spherical nucleus, and hence K is not a good quantum number. The earlier work on the beta-gamma correlation in Eu 154 by Sastry et al s concludes that an appreciably large contribution is due to the matrix element ratio x.…”

Section: Discussionmentioning

confidence: 88%

Beta-Gamma Directional Correlation inEu154

Bhattacherjee

Mitra

1962

Phys. Rev.

View full text Add to dashboard Cite

The directional correlation between the nonunique first-forbidden outer beta group of end-point energy 1855 kev in Eu 154 and the 123-kev cascade gamma ray in Gd 164 has been measured at twelve beta-ray energies. The measured beta-gamma correlation coefficient e ranges from -(0.222±0.013) to -(0.314=b0.017) in the beta-energy interval 1150 to 1700 kev, after correcting for the attenuation due to the extranuclear field effect by measuring the attenuation factor G 2 = 0.7ld=0.03 in the 1277-123 -kev gamma-gamma cascade in Gd 154 . The correlation coefficient e varies almost as (p 2 /W) in this energy interval. The attenuation effect on the beta-gamma correlation coefficient under different physical conditions of the source has been demonstrated experimentally. An analysis of the data by an electronic computer leads to values of the matrix element ratios (Kotani's notation): 0=1, # = 0.5±0.05, u = 0±0.05, and F=1.55±0.10. It is concluded that the "modified By approximation" is reasonably valid in this beta decay.

show abstract

“…Meanwhile, shell model studies of light nuclei have suggested other exchange mixtures. 3,4 These mixtures are supposed to represent effective two-body forces in nuclear matter under a static, central approximation and therefore do not have to reproduce exactly the scattering properties of free nucleons. Nevertheless, there should be some general correspondence-for example, the potential of Eq.…”

Section: (R) = Tw+bp°-hpt-mp"~]vo(e-* R /Kr)mentioning

confidence: 99%

“…A negative anisotropy for the (1855-kev beta) (123-kev gamma) directional correlation has been found 2 which is somewhat lower in magnitude than the directional correlation for the comparable cascade in Eu 152 . 3 Additional measurements of the directional correlation as a function of beta energy in Eu 154 have been reported. 4,5 The shape of the spectrum for the 1855-kev beta group has been measured and found to be intermediate between an allowed and a unique shape, 6 but somewhat closer to the allowed shape than the comparable transition in Eu 152 .…”

Section: Introductionmentioning

confidence: 99%