The Gamma-Radiation from Boron Bombarded by Protons

W. A. Fowler; E. R. Gaerttner; C. C. Lauritsen

doi:10.1103/PhysRev.53.628

Access by Xinjiang University

The Gamma-Radiation from Boron Bombarded by Protons

W. A. Fowler, E. R. Gaerttner^*, and C. C. Lauritsen

W. K. Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California

^*National Research Fellow.

PDF

Phys. Rev. 53, 628 – Published 15 April, 1938

DOI: https://doi.org/10.1103/PhysRev.53.628

Abstract

Employing a Wilson cloud chamber we have determined the distribution in energy of pairs and recoil electrons ejected from lead and carbon laminae by the gamma-radiation from boron bombarded by protons. Both the pair and electron distributions indicate three prominent gamma-ray components at 4.3±0.3 Mev, 11.8±0.5 Mev, and 16.6±0.6 Mev with relative intensities of 1: 1: $\frac{1}{7}$ , respectively. The radiation is believed to result from proton capture by $B^{11}$ to form an excited state of $C^{12}$ which radiates in a single transition to the ground state or in a double transition through the well-known intermediate state at 4.3 Mev. Resonance in the yield has been found only in the region 150→200 kv and the total yield of quanta per incident proton above resonance on a thick boron target is estimated to be ≥5× $10^{- 10}$ .

References (14)

Delsasso, Fowler and Lauritsen, Phys. Rev. 51, 391, 527 (1937)
Richardson and Kurie, Phys. Rev. 50, 999 (1936) Gaerttner and Crane, 51, 49 (1937) ibid.52, 583 (1937) Kruger and Green, 52, 773 (1937)
Crane, Delsasso, Fowler and Lauritsen, Phys. Rev. 48, 102 (1935)
CraneDelsassoFowlerLauritsenHeitlerQuantum Theory of Radiation by , pp. 158, 200
Bainbridge and Jordan, Phys. Rev. 51, 385 (1937)
Bothe and Gentner, Zeits. f. Physik 104, 684 (1937)
Lawrence, McMillan and Henderson, Phys. Rev. 47, 273 (1935) Cockcroft and Lewis, Proc. Roy. Soc. 154, 261 (1936)
Bonner and Brubaker, Phys. Rev. 50, 308 (1936) Bernardini and Bocciarelli, Accad. Lincei, Atti. 24, 132 (1936)
Crane, Delsasso, Fowler and Lauritsen, Phys. Rev. 48, 484 (1935) ibid.46, 1109 (1934) Bothe, Zeits. f. Physik 100, 273 (1936)
Crane and Lauritsen, Phys. Rev. 45, 497 (1934) ibid.48, 103 (1935) Fowler, Delsasso, and Lauritsen, 49, 561 (1936)
Allison, Proc. Camb. Phil. Soc. 32, 179 (1936)
Herb, Kerst and McKibben. Phys. Rev. 51, 691 (1937)
Hafstad, Heydenburg and Tuve, Phys. Rev. 50, 504 (1936) Bethe, Rev. Mod. Phys. 9, 207 (1937) Hafstad and Tuve, Phys. Rev. 48, 306 (1935)
Kalckar, Oppenheimer and Serber, Phys. Rev. 52, 279 (1937)

[c1] Delsasso, Fowler and Lauritsen, Phys. Rev. 51, 391, 527 (1937)

[c2] Richardson and Kurie, Phys. Rev. 50, 999 (1936) Gaerttner and Crane, 51, 49 (1937) ibid.52, 583 (1937) Kruger and Green, 52, 773 (1937)

[c3] Crane, Delsasso, Fowler and Lauritsen, Phys. Rev. 48, 102 (1935)

[c4] CraneDelsassoFowlerLauritsenHeitlerQuantum Theory of Radiation by , pp. 158, 200

[c5] Bainbridge and Jordan, Phys. Rev. 51, 385 (1937)

[c6] Bothe and Gentner, Zeits. f. Physik 104, 684 (1937)

[c7] Lawrence, McMillan and Henderson, Phys. Rev. 47, 273 (1935) Cockcroft and Lewis, Proc. Roy. Soc. 154, 261 (1936)

[c8] Bonner and Brubaker, Phys. Rev. 50, 308 (1936) Bernardini and Bocciarelli, Accad. Lincei, Atti. 24, 132 (1936)

[c9] Crane, Delsasso, Fowler and Lauritsen, Phys. Rev. 48, 484 (1935) ibid.46, 1109 (1934) Bothe, Zeits. f. Physik 100, 273 (1936)

[c10] Crane and Lauritsen, Phys. Rev. 45, 497 (1934) ibid.48, 103 (1935) Fowler, Delsasso, and Lauritsen, 49, 561 (1936)

[c11] Allison, Proc. Camb. Phil. Soc. 32, 179 (1936)

[c12] Herb, Kerst and McKibben. Phys. Rev. 51, 691 (1937)

[c13] Hafstad, Heydenburg and Tuve, Phys. Rev. 50, 504 (1936) Bethe, Rev. Mod. Phys. 9, 207 (1937) Hafstad and Tuve, Phys. Rev. 48, 306 (1935)

[c14] Kalckar, Oppenheimer and Serber, Phys. Rev. 52, 279 (1937)

Physical Review Journals Archive

Export citation

Export citation

The Gamma-Radiation from Boron Bombarded by Protons

Abstract

References (14)

Outline

Information

Filter

Filter

Article Lookup

Enter a citation