Free-Neutron Beta-Decay Half-Life

C. J. Christensen; A. Nielsen; A. Bahnsen; W. K. Brown; B. M. Rustad

doi:10.1103/PhysRevD.5.1628

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Free-Neutron Beta-Decay Half-Life

C. J. Christensen, A. Nielsen^*, A. Bahnsen^†, W. K. Brown^‡, and B. M. Rustad^§

Danish Atomic Energy Commission, Research Establishment Risö, Physics Department, Roskilde, Denmark

^*Present address: Danmarks Ingeniørakademi, Aalborg, Denmark.
^†Present address: Danish Space Research Institute, Lyngby, Denmark.
^‡Present address: University of Wyoming, Laramie, Wyo.
^§Deceased; formerly with Columbia University at Brookhaven National Laboratory, Upton, N. Y.

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Phys. Rev. D 5, 1628 – Published 1 April, 1972

DOI: https://doi.org/10.1103/PhysRevD.5.1628

Abstract

The $β$ -decay half-life of the free neutron was measured. Greater accuracy was obtained through the development of a special $4 π β$ spectrometer with a well-defined source volume and through the use of a new density calibration method with a ${}^{3}{He}$ proportional counter. A clean thermal-neutron beam was developed especially for the measurement. The final result is a half-life of 10.61 ± 0.16 min. The derived value of $\frac{g_{A}}{g_{V}}$ is -1.239 ± 0.011.

References (33)

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[c1] O. Kofoed-Hansen and C. J. Christensen, Handbuch der Physik, edited by S. Flügge (Springer, Berlin, 1962), Vol. XLI, part 2

[c2] R. J. Tayler, Nature 217, 433 (1968)

[c3] A. H. Snell and L. C. Miller, Phys. Rev. 74, 1217 (1948)

[c4] J. M. Robson, Phys. Rev. 77, 747 (1950)

[c5] A. H. Snell, F. Pleasonton, and R. V. McCord, Phys. Rev. 78, 310 (1950)

[c6] J. M. Robson, Phys. Rev. 78, 311 (1950)

[c7] P. E. Spivak, A. N. Sosnovsky, Y. A. Prokofiev, and V. S. Sokolov, in Proceedings of the International Conference on the Peaceful Uses of Atomic Energy, Geneva, 1955 (United Nations, New York, 1956), Vol. 2, p. 33

[c8] J. M. Robson, Phys. Rev. 83, 349 (1951)

[c9] N. D'Angelo, Phys. Rev. 114, 285 (1959)

[c10] A. N. Sosnovsky, P. E. Spivak, Y. A. Prokofiev, I. E. Kutikov, and Y. P. Dobrinin, Nucl. Phys. 10, 395 (1959)

[c11] C. J. Christensen, A. Nielsen, A. Bahnsen, W. K. Brown, and B. M. Rustad, Phys. Letters 26B, 11 (1967)

[c12] C. J. Christensen, A. Nielsen, A. Bahnsen, W. K. Brown, and B. M. Rustad, Risö Report No. 147, 1967 (unpublished)

[c13] B. M. Rustad, J. Als-Nielsen, A. Bahnsen, C. J. Christensen, and A. Nielsen, Rev. Sci. Instr. 36, 48 (1965)

[c14] J. Als-Nielsen, A. Bahnsen, and W. K. Brown, Nucl. Instr. Methods 50, 181 (1967)

[c15] C. J. Christensen et al., Risö Report No. 226, 1971 (unpublished)

[c16] Omitted endnote

[c17] Tables for the Analysis of Beta Spectra, National Bureau of Standards Applied Mathematics Series No. 13 (U.S. Government Printing Office, Washington, D. C., 1952)

[c18] J. H. Hamilton, R. V. Stockendal, D. C. Camp, L. M. Langer, and D. R. Smith, Nucl. Phys. 36, 567 (1962)

[c19] J. Thomas, Risö Report No. 142, 1966 (unpublished)

[c20] S. B. Garfinkel (private communication)

[c21] J. Als-Nielsen, Nucl. Instr. Methods 50, 191 (1967)

[c22] G. Gibson, W. C. Jordan, and E. J. Lauer, Phys. Fluids 6, 116 (1963)

[c23] G. Gibson, W. C. Jordan, and E. J. Lauer, Phys. Fluids 6, 133 (1963)

[c24] T. K. Fowler, Nucl. Fusion 9, 3 (1969)

[c25] D. V. Sivukhin, Rev. Plasma Phys. 1, 1 (1965)

[c26] J. Als-Nielsen, Risö Report No. 196, 1969 (unpublished)

[c27] J. Als-Nielsen, A. Bahnsen, and W. K. Brown, Risö Report No. 144, 1966 (unpublished)

[c28] J. Als-Nielsen and O. Dietrich, Phys. Rev. 133, B925 (1964)

[c29] J. M. Freeman, J. G. Jenkin, G. Murray, and D. C. Robinson, Nucl. Phys. A132, 593 (1969)

[c30] R. J. Blin-Stoyle and J. M. Freeman, Nucl. Phys. A150, 369 (1970)

[c31] H. Bühring and H. Schopper, Kernforschungszentrum, Karlsruhe Report No. KFK-307, 1965 (unpublished)

[c32] V. V. Vladimirsky, V. K. Grigorev, V. A. Ergakov, D. P. Zharkov, and Y. V. Trebukhovsky, Izv. Akad. Nauk SSSR, Ser. Fiz. 25, 1121 (1961) [Bull. Acad. Sci. U.S.S.R., Phys. Ser. 25, 1128 (1961)]

[c33] C. J. Christensen, V. E. Krohn, and G. R. Ringo, Phys. Rev. C 1, 1693 (1970)

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