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Journal ArticleDOI

Internal Bremsstrahlung and Ionization Accompanying Beta Decay

01 Feb 1954-Physical Review (American Physical Society)-Vol. 93, Iss: 3, pp 518-523

Abstract: Internal bremsstrahlung spectra from S35 and Pm147 have been investigated with the NaI scintillation spectrometer. Both the absolute cross section of production and the energy distribution agree with theoretical predictions. The theoretical internal bremsstrahlung spectrum of RaE was calculated by using both the observed forbidden beta spectrum and an allowed beta distribution. No significant differences in shape were found in these two cases except in the absolute cross section of production. The ionization accompanying beta decay was studied in the case of RaE and also in Pm147 by measuring the characteristic x-rays in an NaI scintillation counter as well as in a proportional counter spectrometer. Both K and L radiations were observed, and their absolute cross sections were compared with the theoretical calculations of Migdal, Feinberg, and Levinger. Because of the approximate nature of the theoretical calculations, the agreement between the theoretical and experimental results is considered satisfactory.
Topics: Internal conversion (57%), Bremsstrahlung (55%), Proportional counter (54%), Ionization (53%), Scintillation (51%)
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M. Shamsuzzoha Basunia1Institutions (1)
Abstract: Evaluated spectroscopic data for 210 Au, 210 Hg, 210 Tl, 210 Pb, 210 Bi, 210 Po, 210 At, 210 Rn, 210 Fr, 210 Ra, 210 Ac, and 210 Th and corresponding level schemes from radioactive decay and reaction studies are presented. This evaluation supersedes the previous evaluation by E. Browne (2003Br13). Highlights of this publication are the identification of new μ s isomers of 210 Hg by 2013Go10 and measurement of an excited level energy at 1709 keV 30 of 210 Rn from 214 Rn α decay: 68.6 μ s by 2006Ku26 denoted as x+1664.6 in the Adopted Levels. Earlier experimental limits for x≤50 keV was proposed in 1979Po19 and 1982Po03 – (HI,xn γ ).

49 citations

Journal ArticleDOI
L. Hayen1, Nathal Severijns1, Kazimierz Bodek2, D. Rozpedzik2  +1 moreInstitutions (2)
Abstract: A fully analytical description of the allowed β spectrum shape is given in view of ongoing and planned measurements. Its study forms an invaluable tool in the search for physics beyond the standard electroweak model and the weak magnetism recoil term. Contributions stemming from finite size corrections, mass effects, and radiative corrections are reviewed. Particular focus is placed on atomic and chemical effects, where the existing description is extended and analytically provided. The effects of QCD-induced recoil terms are discussed, and cross-checks were performed for different theoretical formalisms. Special attention was given to a comparison of the treatment of nuclear structure effects in different formalisms. Corrections were derived for both Fermi and Gamow-Teller transitions, and methods of analytical evaluation thoroughly discussed. In its integrated form, calculated f values were in agreement with the most precise numerical results within the aimed for precision. The need for an accurate evaluation of weak magnetism contributions was stressed, and the possible significance of the oft-neglected induced pseudoscalar interaction was noted. Together with improved atomic corrections, an analytical description was presented of the allowed β spectrum shape accurate to a few parts in 10-4 down to 1 keV for low to medium Z nuclei, thereby extending the work by previous authors by nearly an order of magnitude.

49 citations

Cites background from "Internal Bremsstrahlung and Ionizat..."

  • ...Consequently, its experimental detection has been an interesting observable for several decades (Basavaraju, 1983; Boehm and Wu, 1954; Budick et al., 1992; Goldhaber et al., 1957; Khalil, 2011a,b; Singh and Dhaliwal, 2014, 2015)....


Journal ArticleDOI
B. Harmatz1Institutions (1)
Abstract: Nuclear structure information pertaining to A=210 has been reviewed. The level properties obtained from decay and reaction experiments are shown in the drawings. Experimental methods, references, and comment are given in the text.

33 citations

Journal ArticleDOI
Börje Persson1Institutions (1)
01 Jun 1964-Nuclear Physics
Abstract: Spectra of internal bremsstrahlung from the beta decays of P 32 , Sr 89 , Y 90 , Y 91 and Bi 210 have been measured in a coincidence experiment. The beta particles are detected by an anthracene scintillation spectrometer and the bremsstrahlung spectrum is measured by asodium iodide scintillation spectrometer. P 32 is an allowed beta emitter and the experimental results are compared with the theory of Knipp and Uhlenbeck and of Bloch, (corrected for the Coulomb effect). The agreement is very good. Sr 89 , Y 90 and Y 91 are classified as beta emitters of first order unique forbidden type. The calculations of Madansky et al. (corrected for Coulomb effects) are used for comparison with the experiment. Reasonable agreement is found at the low energy ends of the spectra; but the experiment shows a considerable excess in the medium and high energy ranges. The results for Bi 210 are compared with the calculations of Knipp and Uhlenbeck for an allowed transition. The experimental β-spectrum has been used and the Coulomb correction has been performed according to the method of Nilsson. It is found that the calculated spectra fit the experimental ones fairly well.

33 citations

Journal ArticleDOI
J. Law1, John Campbell1Institutions (1)
01 May 1972-Nuclear Physics
Abstract: A new theoretical treatment of auto-ionization in β-decay is presented; a one-step model is assumed and explicit account is taken of the indistinguishability of the two continuum negatons. A critical review of experimental data for the K shell is given. While agreement between recent experiments and the theory is encouraging, it is clear that new experimental data are urgently required.

30 citations

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