Coincidence Studies of the Thermal Neutron Capture Gamma Rays of Chromium

W. R. Kane; N. F. Fiebiger; J. D. Fox

doi:10.1103/PhysRev.125.2037

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Coincidence Studies of the Thermal Neutron Capture Gamma Rays of Chromium

W. R. Kane, N. F. Fiebiger^*, and J. D. Fox^†

Brookhaven National Laboratory, Upton, New York

^*On leave from Institut für Kernphysik, Frankfurt, Germany.
^†Present address: Florida State University, Tallahassee, Florida.

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Phys. Rev. 125, 2037 – Published 15 March, 1962

DOI: https://doi.org/10.1103/PhysRev.125.2037

Abstract

The gamma-ray cascades which follow thermal neutron capture in chromium have been investigated by means of the measurement of coincidences between gamma rays detected by a three-crystal pair spectrometer and a single NaI crystal. Samples of normal chromium and chromium enriched in ${Cr}^{50}$ and ${Cr}^{53}$ were used. The following assignments of gamma rays to individual isotopes have been made. ${Cr}^{51}$ : 8.499, 7.36, 6.34, 6.12, 5.46, and 5.18 Mev; ${Cr}^{53}$ : 7.929, 7.36, 5.61, and 5.26 Mev; ${Cr}^{54}$ : 9.716, 8.881, 7.097, 6.872, 6.644, 6.31, 6.00, and 4.83 Mev. A number of features of the de-excitation of the energy levels populated by these transitions are established.

References (23)

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[c1] Neutron Cross Sections, compiled by D. J. Hughes and R. B. Schwartz, Brookhaven National Laboratory Report BNL-325 (Superintendent of Documents, U. S. Government Printing Office, Washington, D. C., 1958), 2nd ed

[c2] B. B. Kinsey and G. A. Bartholomew, Phys. Rev. 89, 375 (1953)

[c3] L. V. Groshev, A. M. Demidov, V. N. Lutsenko, and V. I. Pelekhov, Atlas of $γ$ -Ray Spectra from Radiative Capture of Thermal Neutrons (translation. Pergamon Press, London, New York, 1959)

[c4] T. H. Braid, Phys. Rev. 102, 1109 (1956)

[c5] M. Reier, and M. H. Shamos, Phys. Rev. 100, 1302 (1955)

[c6] M. E. Bunker and J. W. Starner, Phys. Rev. 97, 1272 (1955)

[c7] P. H. Stelson, W. M. Preston, and C. Goodman, Phys. Rev. 80, 287 (1950)

[c8] R. Ballini, Y. Cassagnon, G. Levi, and L. Papineau, Compt. rend. 251, 947 (1960)

[c9] M. Nozawa, H. Yamamoto, Y. Yoshizawa, and Y. Koh, J. Phys. Soc. Japan 15, 2137 (1960)

[c10] C. E. McFarland, M. M. Bretscher, and F. B. Shull, Phys. Rev. 89, 892(A) (1953)

[c11] F. A. El Bedewi and S. Tadros, Nuclear Phys. 19, 604 (1960)

[c12] A. J. Elwyn and F. B. Shull, Bull. Am. Phys. Soc. 1, 281 (1956) Phys. Rev. 111, 925 (1958)

[c13] W. C. Porter, D. M. Van Patter, M. A. Rothman, and C. E. Mandeville, Phys. Rev. 112, 468 (1958)

[c14] A. W. Schardt and B. J. Dropesky, Bull. Am. Phys. Soc. 1, 162 (1956)

[c15] B. J. Raz, Bull. Am. Phys. Soc. 1, 336 (1956)

[c16] M. Deutsch and L. G. Elliott, Phys. Rev. 65, 211 (1944)

[c17] D. S. Andreev, A. P. Grinberg, G. M. Gusinskii, K. I. Erokhina, and I. Kh. Lemberg, Izvestiya Akad. Nauk (U.S.S.R.), Ser. Fiz. 24, 1474 (1960)

[c18] G. Trumpy, Nuclear Phys. 2, 664 (1956)

[c19] R. E. Segel, Phys. Rev. 111, 1620 (1958) ibid.113, 844 (1959)

[c20] N. F. Fiebiger, W. R. Kane, and R. E. Segel, Phys. Rev. (to be published)

[c21] R. L. Chase, Brookhaven National Laboratory, Report No. 3838, 1958 (unpublished)

[c22] J. P. Schiffer, L. L. Lee, Jr., J. L. Yntema, and B. Zeidman, Proceedings International Congress on Nuclear Physics, Paris, July 7-12, 1958 (Dunod, Paris, 1959), p. 536

[c23] G. Scharff-Goldhaber and J. Weneser, Phys. Rev. 98, 212 (1955)

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Coincidence Studies of the Thermal Neutron Capture Gamma Rays of Chromium

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