The positon decay of 10C and the ft value of the superallowed Fermi transition 10C(β+)10∗∗B

doi:10.1016/0375-9474(69)90362-5

Nuclear Physics A

Volume 124, Issue 2, 10 February 1969, Pages 393-400

https://doi.org/10.1016/0375-9474(69)90362-5 Get rights and content

Abstract

The energies and relative intensities of the gamma rays following the positon decay of ¹⁰C to ¹⁰B have been studied in order to determine accurately the beta end-points and branching ratios in the decay. The energies of the first two excited states of ¹⁰B have been measured as 718.32±0.09 and 1740.16±0.17 KeV, respectively. The branching ratios for the positon decay to the first, second and third excited states have been found to be 98.48_−0.02^+0.03, 1.523_−0.021^+0.018 and 0_−0.00^+0.02%. The ft values for the Fermi and Gamow-Teller transitions have been deduced.

References (20)

N. Brene et al.
Nucl. Phys.
(1968)
T. Lauritsen et al.
Nucl. Phys.
(1966)
J.M. Freeman et al.
Phys. Lett.
(1966)
W.W. Black et al.
Nucl. Phys.
(1967)
D.H. White et al.
Nucl. Phys.
(1967)
J.M. Freeman et al.
Nucl. Instr.
(1966)
F.J. Bartis
Phys. Rev.
(1963)
G. Källén
Nucl. Phys.
(1967)
J.M. Freeman et al.
Phys. Lett.
(1968)
S. Cohen et al.
Nucl. Phys.
(1965)

There are more references available in the full text version of this article.

Cited by (15)

The ft value of the 10C superallowed fermi β-decay
1974, Nuclear Physics, Section A
Energy levels of A = 21-44 nuclei (V)
1973, Nuclear Physics, Section A
A new measurement of the branching ratio for 10C superallowed Fermi decay and its significance for the weak vector interaction
1972, Nuclear Physics, Section A
The branching ratio for the pure Fermi decay ¹⁰C(β⁺)¹⁰B^∗∗ to the second excited state of ¹⁰B has been measured by an accurate determination of the ratio of the intensities of 1.022 and 0.718 MeV γ-rays following this decay and the Gamow-Teller transition to the first excited state of ¹⁰B. Computer programmes were devised for accurate analysis of the intensities of the full energy peaks obtained with a Ge(Li) detector, and for deducing the detector relative efficiency from calibration source data. The results were averaged with those from previous measurements of comparable accuracy to give β₁ = (98.53 ±0.02) % and β₂ = (1.465 ± 0.014) % as the best values of the branching ratios for positon decay to the first and second excited states of ¹⁰B respectively. The ft value of the Fermi transition was deduced as 3155±40 s with radiative corrections, and the corresponding vector coupling constant as G_β^V = (1.396 ± 0.009) × 10⁻⁴⁹ erg · cm³.
Is the detailed shape of the nuclear charge distribution relevant to the ft values of superallowed Fermi transitions?
1972, Nuclear Physics, Section A
The uniform nuclear charge distribution remains a satisfactory model for calculating electron radial wave functions and nuclear matrix elements even in the case of the superallowed Fermi transitions of light nuclei up to ⁵⁴Co, where high accuracy is needed to determine the vector coupling constant of nuclear β-decay. The modifications due to the deviation of the realistic charge distribution from this simple model are found to be smaller than previously thought and therefore are negligible, provided that the nuclear radius, which is the most important shape parameter, has its correct value (i.e. the r.m.s. radii of the realistic and the model distribution are the same). Moreover, the dependence on the nuclear radius is fairly small for the light nuclei under consideration.
Mesures de vies moyennes dans 13C et 10B par la méthode du parcours de recul
1970, Nuclear Physics, Section A
Superallowed 0+→0+ nuclear β decays: 2020 critical survey, with implications for v ud and CKM unitarity
2020, Physical Review C

View all citing articles on Scopus

^†: Present address: Physics Department, La Trobe University, Victoria, Australia.

View full text

Article preview

Nuclear Physics A

Abstract

References (20)

Nucl. Phys.

Nucl. Phys.

Phys. Lett.

Nucl. Phys.

Nucl. Phys.

Nucl. Instr.

Phys. Rev.

Nucl. Phys.

Phys. Lett.

Nucl. Phys.

Cited by (15)

The ft value of the <sup>10</sup>C superallowed fermi β-decay

Energy levels of A = 21-44 nuclei (V)

A new measurement of the branching ratio for <sup>10</sup>C superallowed Fermi decay and its significance for the weak vector interaction

Is the detailed shape of the nuclear charge distribution relevant to the ft values of superallowed Fermi transitions?

Mesures de vies moyennes dans <sup>13</sup>C et <sup>10</sup>B par la méthode du parcours de recul

Superallowed 0+→0+ nuclear β decays: 2020 critical survey, with implications for v ud and CKM unitarity