Abstract
Theγ-radiation from the10B(n,γ) reaction is studied using an unpolarized target. More accurate values for energies of transitions in11B could be determined. No new levels have been found. TheQ value of this reaction: 11,454.1 (2)keV, is in agreement with earlier experiments. Also a new value for the cross section could be derived: 0.29 (4) barn, which is a factor 5 more accurate than earlier experiments.
The10B(n, α)7 Li reaction, leading to the 478 keV state in7Li, is studied by means of polarized10B nuclei and polarized neutrons. The resulting anisotropy in the directional distribution of the7Li particles manifests itself in the Doppler broadening of the 478 keV line. Analysis of the line shape directly yields the conclusion, that the reaction proceeds for more than 96% through theJ=7/2 channel of11B in case of destructive channel interference of theJ=5/2 channel. Constructive channel interference is only possible if the reaction proceeds for more than 99.5% through theJ=7/2 channel. It appeared that the outcomingα and7Li particles are emitted predominantly in directions perpendicular to the nuclear orientation axis.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Mughabghab, S.F., Divadeenam, M., Holden, N.E.: Neutron cross sections. Vol. 1, Part A, New York: Academic Press 1981
Thomas, G.E., Blatchley, D.E., Bollinger, L.M.: Nucl. Instrum. Methods56, 325 (1967)
Wetzel, K.J.: Phys. Rev.181, 1465 (1969)
Lobov, G.A. and Danilyan, G.V.: Isv. Acad. Sci. USSR41, 1548 (1977)
Vesna, V.A., Egorov, A.I., Kolomenskii, E.A., Lobashev, V.M., Pirozhkov, A.N., Smotritskii, L.M., Titov, N.A.: JETP Lett.33, (No. 8) 411 (1981)
Greenwood, R.C., Chrien, R.E.: Nucl. Instrum. Methods175, 515 (1980)
Kennet, T.J., Prestwich, W.V., Islam, M.A., Kerr, S.A.: Nucl. Instrum. Methods174, 538 (1980)
Krusche, B., Lieb, K.P., Daniel, H., Egidy, T. von, Barreau, G., Borner, H.G., Brissot, R., Hofmeyr, C.: Nucl. Phys. A386, 245 (1982)
Ajzenberg-Selove, F.: Nucl. Phys. A320, 1 (1979)
Ajzenberg-Selove, F.: Nucl. Phys. A248, 1 (1975)
Ferguson, A.J.: Angular correlation methods in gamma-ray spectroscopy, Amsterdam: North Holland Publ. Co. 1965
Bosman, J.J., Postma, H.: Nucl. Instrum. Methods148, 331 (1978)
Lounasmaa, O.V.: Experimental principles and methods below 1 K. London, New York: Academic Press 1974
Ruyl, J.F.A.G., Haas, J.B.M. de, Endt, P.M., Zybert, L.: Nucl. Phys. A419, 439 (1984)
Delheij, P.P.J., Girgin, A., Abrahams, K., Postma, H., Huiskamp, W.J.: Nucl. Phys. A341, 21 (1980)
Groot, S.R. de, Tolhoek, H.A., Huiskamp, W.J.: In: Alpha-, Beta-, and Gamma-Ray Spectroscopy. Siegbahn, K. (ed.), Vol. 2, p. 1199. Amsterdam: North Holland Publ. Co. 1965
Biedenharn, L.C., Rose, M.E.: Revs. Mod. Phys.25, 729 (1953)
Northcliffe, L.C., Schilling, R.F.: Nucl. Data Tables A7, 233 (1970)
Neuwirth, W., Hauser, U., Kühn, E.: Z. Phys.220, 241 (1969)
Neuwirth, W., Pietsch, W., Richter, K., Häuser, U.: Z. Phys. A — Atoms and Nuclei275, 209 (1975)
Tielens, T.A.A., Haas, J.B.M. de: Nucl. Phys. A425, 303 (1984)
Stecher-Rasmussen, F., Abrahams, K., Kopecky, J.: Nucl. Phys. A181, 225 (1977)
Lindhard, J., Scharff, M., Schiøtt, H.E.: K. Dan. Vidensk. Selsk. Mat. Fys. Medd.33, 14 (1963)
Blaugrund, A.E.: Nucl. Phys.88, 501 (1966)
Ajzenberg-Selove, F., Busch, C.L.: Nucl. Phys. A336, 1 (1980)
Kok, P.J.J., Abrahams, K., Postma, H., Huiskamp, W.J.: Nucl. Instrum. Methods B12, 325 (1985)
Lane, R.O., Hausladen, S.L., Monahan, J.E., Elwyn, A.J., Mooring, F.P., Langsdorf Jr., A.: Phys. Rev. C4, 380 (1971)
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Kok, P.J.J., de Haas, J.B.M., Abrahams, K. et al. Investigation of excited states of11B and7Li by means of thermal neutron capture on10B nuclei. Z. Physik A - Atomic Nuclei 324, 271–281 (1986). https://doi.org/10.1007/BF01294580
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01294580