<i>Weak Interactions and Nuclear Beta Decay</i>

Schopper, H.; Rose, M. E.

doi:10.1063/1.3034160

Cited by 109 publications

(137 citation statements)

References 0 publications

Supporting

Mentioning

128

Contrasting

Unclassified

Order By: Relevance

“…A least-squares fit by means of a single exponential decay and a constant background gave a value of T 1/2 =9.37(4) µs for the halflife of the 93-keV level, which is comparable to results from previous studies [4]. From the E β − − E γ histogram, β − spectra were produced by gating on the 91-, 93-and 185-keV γ rays and converted to Fermi-Kurie plots [20], together with the spectrum from the singles measurement. By using linear least-squares fits to the tails of the FermiKurie histograms, the end-point energies were deduced and converted to Q β − (g.s.)…”

Section: A Energy and Efficiency Calibrationssupporting

confidence: 80%

Precise absoluteγ-ray andβ−-decay branching intensities in the decay ofCu2967

Chen¹,

Kondev²,

Ahmad³

et al. 2015

Phys. Rev. C

View full text Add to dashboard Cite

Absolute γ-ray emission probabilities in the β − decay of 67 Cu were measured by means of γ-ray and β − -decay singles and β − − γ coincidences. The new results, together with the known decay scheme of 67 Cu, were used to determine absolute β − -decay branching intensities. The present data differ significantly from previously published values. In addition, the half-life of the I π =1/2 − isomer in 67 Zn was measured as T 1/2 =9.37(4) µs, in a good agreement with earlier measurements. From the analysis of the Fermi-Kurie plots, Q β − (g.s.)=560.3(10) keV was deduced, which differs from the previously measured value of 577(8) keV, but it is in a good agreement with Q β − (g.s.)=561.3(15) keV recommended in the latest Atomic Mass Evaluation.

show abstract

Section: A Energy and Efficiency Calibrationssupporting

confidence: 80%

Precise absoluteγ-ray andβ−-decay branching intensities in the decay ofCu2967

Chen¹,

Kondev²,

Ahmad³

et al. 2015

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…In forbidden non-unique transitions, the energy dependence of the nuclear matrix elements cannot be factored out, which greatly complicates the calculation of the beta spectral shapes. However, first forbidden non-unique transitions which fulfil the following assumption can be treated as allowed ones (Schopper, 1966):…”

Section: Theoretical Shape Factorsmentioning

confidence: 99%

Calculation of beta spectral shapes

2014

View full text Add to dashboard Cite

-Classical beta spectra calculations are briefly described, highlighting the usual assumptions and limitations. To go beyond these usual assumptions, the numerical resolution of the Dirac equation for the atomic and beta electrons is necessary. This allowed us to determine the parameters λ i involved in the theoretical shape factors exactly. A systematic comparison between theoretical and experimental shape factors led us to disqualify the usual λ i = 1 assumption for all forbidden transitions. The usual ξ-approximation was proved to be incorrect for numerous first forbidden non-unique transitions, and for all higherorder non-unique transitions. A more accurate screening correction was defined and the atomic exchange effect was taken into account, an effect which is always neglected in usual calculations. The beta spectra of 63 Ni and 241 Pu, recently measured down to very low energies, are well reproduced in our calculations. The exchange effect was demonstrated to have a great influence on the spectral shape within this energy range.

show abstract

“…Radiation emitted from an oriented nucleus is in general described by (1) where the Qk are the solid angle correction factors, Bk are orientation parameters describing the degree of orientation of the emitting nuclear state,· Uk are deorientation parameters which correct for the effect of unobserved intermediate radiations, Ak are angular distribution coefficients which depend on the properties of the observed radiation, and Pk are Legendre polynomials evaluated at the angle e between the emission direction and the polarization direction. In the case of allowed b.eta emission, the angular distribution function becomes (assuming T invariance, maximal P violation and no second forbidden contributions):…”

Section: Theorymentioning

confidence: 99%

“…This may be implemented either (1) by observing the anisotropy of beta emission relative to the nuclear polarization axis (using an external polarizing field applied to nuclei cooled to ultralow temperatures 4 ), or (2) by observing the angular correlation between the direction of beta emission (from an unpolarized nuclear state) and the direction of a subsequent coincident gamma ray, whose circular polarization . 5 .…”

Section: Introductionmentioning

confidence: 99%

Beta-decay asymmetry from the decays of orientedMn52andCo
Hung
¹
,
Krane
²
,
Shirley
³

1976
Phys. Rev. C
10
1
2
0
View full text Add to dashboard Cite

LBL-3488The beta decay of 52 Mn has been investigated by measuring the angular distribution asymmetry of the positrons emitted from 52 Mn oriented at low temperatures. The 52 Mn nuclei were polarized in an iron lattice and cooled by thermal contact w.ith an adiabatically demagnetized paramagnetic salt. The positron asymmetry was determined by means of two independent techniques: the positrons were detected directly using highpurity germanium detectors and indirectly using Nal detectors to observe the annihilation gamma rays. These two techniques yielded a consistent result for the asymmetry, corresponding for this allowed decay to a ratio of the Fermi to Gamow-Teller matrix elements of y = C'f1F/CAMGT = -0.144 ± 0.006. An auxiliary experiment on 60 co gave a beta asymmetry A = -0.971 ± 0.034, in excellent agreement with the theoretical value of -1 expected for maximal parity violation. 0 0 0 0 4 2 0 6 -1-

show abstract

Weak Interactions and Nuclear Beta Decay

Cited by 109 publications

References 0 publications

Precise absoluteγ-ray andβ−-decay branching intensities in the decay ofCu2967

Precise absoluteγ-ray andβ−-decay branching intensities in the decay ofCu2967

Calculation of beta spectral shapes

Beta-decay asymmetry from the decays of orientedMn52andCo
Hung
¹
,
Krane
²
,
Shirley
³

1976
Phys. Rev. C
10
1
2
0
View full text Add to dashboard Cite

Contact Info

Product

Resources

About

Weak Interactions and Nuclear Beta Decay

Cited by 109 publications

References 0 publications

Precise absoluteγ-ray andβ−-decay branching intensities in the decay ofCu2967

Precise absoluteγ-ray andβ−-decay branching intensities in the decay ofCu2967

Calculation of beta spectral shapes

Beta-decay asymmetry from the decays of orientedMn52andCoHung1, Krane2, Shirley3 1976Phys. Rev. C10120View full textAdd to dashboardCite

Contact Info

Product

Resources

About

Beta-decay asymmetry from the decays of orientedMn52andCo
Hung
¹
,
Krane
²
,
Shirley
³

1976
Phys. Rev. C
10
1
2
0
View full text Add to dashboard Cite