Ionization Chamber Study of the Disintegration of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">He</mi></mrow><mrow><mn>3</mn></mrow></msup></mrow></math></span> and <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">N</mi></mrow><mrow><mn>14</mn></mrow></msup></mrow></math></span> by Thermal Neutrons

W. Franzen; J. Halpern; W. E. Stephens

doi:10.1103/PhysRev.77.641

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Ionization Chamber Study of the Disintegration of ${He}^{3}$ and $N^{14}$ by Thermal Neutrons

W. Franzen^*, J. Halpern, and W. E. Stephens

University of Pennsylvania, Philadelphia, Pennsylvania

^*Mary Amanda Wood Research Associate at the University of Pennsylvania until August 31, 1949. Now at Palmer Physical Laboratory, Princeton University.

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Phys. Rev. 77, 641 – Published 1 March, 1950

DOI: https://doi.org/10.1103/PhysRev.77.641

Abstract

The total ionization produced by the reactions ${He}^{3} (n, p)$ and $N^{14} (n, p)$ in a gas mixture consisting mainly of argon was measured by means of a cylindrical ionization chamber operated under conditions of electron collection. High resolution was achieved by suitable choice of chamber geometry and by use of a low noise level amplifier. The total ionization charges collected from polonium alpha-particles, from the disintegration products of ${He}^{3} (n, p)$ and from those of $N^{14} (n, p)$ are found to be in the ratio 1:0.145±0.002:0.119±0.001, respectively. Comparison with polonium alpha-particles on the assumption of a constant average energy per ion pair in argon then yields reaction energies of 766±10 kev for ${He}^{3} (n, p)$ and 630±6 kev for $N^{14} (n, p)$ . The difference between these energies agrees well with the difference between the end points of the beta-ray spectra of $C^{14}$ and $H^{3}$ . This agreement supports the assumption of a proportionality between energy and ionization in argon independent of particle type. A value of 785±6 kev is computed for the neutron-hydrogen mass difference from these data.

References (27)

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[c1] J. K. Boggild, Kgl. Danske Vid. Sels. Math.-fys. Medd. 23, 22 (1945)

[c2] D. J. Hughes and C. Eggler, Phys. Rev. 73, 809 (1948)

[c3] Cornog, Franzen, and Stephens, Phys. Rev. 74, 1 (1948)

[c4] Bridge, Hazen, Rossi, and Williams, Phys. Rev. 74, 1084 (1948)

[c5] P. G. Koontz and T. A. Hall, Rev. Sci. Inst. 18, 643 (1947)

[c6] O. Erbacher, Zeits. f. physik Chemie A156, 142 (1931)

[c7] M. Sands, LADC 82

[c8] W. C. Elmore, Nucleonics 2, No. 3, 16 (1948)

[c9] Coon, Goldblatt, Nobles, and Robinson, AECD 2190

[c10] J. H. Coon and R. A. Nobles, Phys. Rev. 75, 1358 (1949)

[c11] L. O. P. King and L. Goldstein, Phys. Rev. 75, 1366 (1949)

[c12] Batchelor, Epstein, Flowers and Whittaker, Nature 163, 211 (1949)

[c13] (a) W. P. Jesse and H. Forstat, Phys. Rev. 74, 1259(A) (1948) (b) W. P. Jesse and J. Sadauskis, 75, 1110 (1949)

[c14] T. E. Cranshaw and J. A. Harvey, Can. J. Research 26, 243 (1948)

[c15] L. H. Gray, Proc. Camb. Phil. Soc. 40, 72 (1944)

[c16] M. G. Holloway and M. S. Livingston, Phys. Rev. 54, 18 (1938)

[c17] [Franzen, Halpern, and Stephens, Phys. Rev. 76, 317 (1949)]

[c18] [13]

[c19] Stebler, Huber, and Bichsel, Helv. Phys. Acta 22, 362 (1949)

[c20] G. C. Hanna and B. Pontecorvo, Phys. Rev. 75, 983 (1949)

[c21] Curran, Angus, and Cockroft, Phil. Mag. 40, 53 (1949) Phys. Rev. 76, 853 (1949)

[c22] Cook, Langer, and Price, Phys. Rev. 74, 548 (1948)

[c23] Shoupp, Jennings, and Sun, Phys. Rev. 75, 1 (1949)

[c24] Taschek, Jarvis, Argo, and Hemmendinger, Phys. Rev. 76, 325 (1949)

[c25] R. E. Bell and L. G. Elliott, Phys. Rev. 74, 1552 (1948)

[c26] W. R. Cohen and W. F. Hornyak, Phys. Rev. 72, 1127 (1947)

[c27] Tollestrup, Jenkins, Fowler, and Lauritsen, Phys. Rev. 75, 1947 (1949)

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Ionization Chamber Study of the Disintegration of ${He}^{3}$ and $N^{14}$ by Thermal Neutrons

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Ionization Chamber Study of the Disintegration of He3 and N14 by Thermal Neutrons

Abstract

References (27)

Ionization Chamber Study of the Disintegration of ${He}^{3}$ and $N^{14}$ by Thermal Neutrons