Proton Induced Radioactivities

L. A. DuBridge; S. W. Barnes; J. H. Buck; C. V. Strain

doi:10.1103/PhysRev.53.447

Access by Xinjiang University

Proton Induced Radioactivities

L. A. DuBridge, S. W. Barnes, J. H. Buck, and C. V. Strain

University of Rochester, Rochester, New York

PDF

Phys. Rev. 53, 447 – Published 15 March, 1938

DOI: https://doi.org/10.1103/PhysRev.53.447

Abstract

Results are tabulated of the radioactivities produced by 4 Mev protons in targets of ${}_{7}N$ , ${}_{8}O$ , ${}_{20}{Ca}$ , ${}_{24}{Cr}$ , ${}_{27}{Co}$ , ${}_{30}{Zn}$ , ${}_{34}{Se}$ , ${}_{42}{Mo}$ , ${}_{46}{Pd}$ , ${}_{48}{Cd}$ , ${}_{49}{In}$ . In most cases the reactions are of the $p - n$ type, and lead to isotopes which emit either + or - electrons. A detailed study was made of O, Zn and Se. The reaction $O^{18} (p, n) F^{18}$ (107 min.) shows a threshold at 2.56 Mev and a positron energy of 0.74 Mev in good agreement with the energy relations. The cross section for the reaction at 4 Mev is about 2× $10^{- 25}$ ${cm}^{2}$ and there is a resonance maximum at 3.55 Mev. The cross section for the reaction $O^{16} (p, γ) F^{17}$ is 4000 times smaller. The isomeric ${Br}^{80}$ periods (17.4 min. and 4.45 hr.) are observed in the reaction ${Se}^{80} (p, n) {Br}^{80}$ . At 4 Mev the ratio of the short to long period activities for infinite bombardment is about 15 but the thresholds are at about 3.0 and 3.2 Mev, respectively. The cross section for the reaction is about 0.6× $10^{- 26}$ ${cm}^{2}$ at 4 Mev.

References (18)

S. W. Barnes, L. A. DuBridge, et al., Phys. Rev. 51, 775 (1937) 51, 995 (1937) 51, 1012 (1937)
E. O. Lawrence and M. S. Livingston, Phys. Rev. 45, 608 (1934) E. O. Lawrence and D. Cooksey, 50, 1131 (1936)
M. C. Henderson and M. G. White, Rev. Sci. Inst. 9, 19 (1938)
L. R. Hafstad, Phys. Rev. 44, 201 (1933)
M. S. Livingston and H. A. Bethe, Rev. Mod. Phys. 9, 245 (1937)
Omitted endnote
Omitted endnote
L. N. Ridenour and W. J. Henderson, Phys. Rev. 52, 889 (1937)
A. H. Snell, Phys. Rev. 51, 142 (1937)
M. L. Pool, J. M. Cork and R. L. Thornton, Phys. Rev. 52, 239 (1937)
H. A. Bethe, Rev. Mod. Phys. 9, 172 (1937)
H. W. Newson, Phys. Rev. 51, 620 (1937)
Omitted endnote
A. H. Snell, Phys. Rev. 52, 1007 (1937)
M. L. Pool, Phys. Rev. 52, 380 (1937)
J. M. Cork and R. L. Thornton, Phys. Rev. 51, 608 (1937) ibid.52, 531 (1937)
H. Walke, Phys. Rev. 51, 439 (1937)
Omitted endnote

[c1] S. W. Barnes, L. A. DuBridge, et al., Phys. Rev. 51, 775 (1937) 51, 995 (1937) 51, 1012 (1937)

[c2] E. O. Lawrence and M. S. Livingston, Phys. Rev. 45, 608 (1934) E. O. Lawrence and D. Cooksey, 50, 1131 (1936)

[c3] M. C. Henderson and M. G. White, Rev. Sci. Inst. 9, 19 (1938)

[c4] L. R. Hafstad, Phys. Rev. 44, 201 (1933)

[c5] M. S. Livingston and H. A. Bethe, Rev. Mod. Phys. 9, 245 (1937)

[c6] Omitted endnote

[c7] Omitted endnote

[c8] L. N. Ridenour and W. J. Henderson, Phys. Rev. 52, 889 (1937)

[c9] A. H. Snell, Phys. Rev. 51, 142 (1937)

[c10] M. L. Pool, J. M. Cork and R. L. Thornton, Phys. Rev. 52, 239 (1937)

[c11] H. A. Bethe, Rev. Mod. Phys. 9, 172 (1937)

[c12] H. W. Newson, Phys. Rev. 51, 620 (1937)

[c13] Omitted endnote

[c14] A. H. Snell, Phys. Rev. 52, 1007 (1937)

[c15] M. L. Pool, Phys. Rev. 52, 380 (1937)

[c16] J. M. Cork and R. L. Thornton, Phys. Rev. 51, 608 (1937) ibid.52, 531 (1937)

[c17] H. Walke, Phys. Rev. 51, 439 (1937)

[c18] Omitted endnote

Physical Review Journals Archive

Export citation

Export citation

Proton Induced Radioactivities

Abstract

References (18)

Outline

Information

Filter

Filter

Article Lookup

Enter a citation