Abstract
The decay of115mIn has been investigated using accurate counting methods. The emission rate of conversion electrons plusβ −-particles was determined with a 4π proportional flow counter. The total andK-shell internal conversion coefficients of the 336 keVγ-ray in115In were measured by the electron X-ray coincidence method using combinations of a Si surface barrier with a NaI(Tl) detector and of a magneticβ-spectrometer with a high energy resolution Si(Li) detector, respectively. The conversion ratioR=K/(L+M+...) was deduced from electron spectra recorded with the magneticβ-spectrometer. The 336 keVγ-ray emission rate of all used sources was determined with a calibrated NaI(Tl)γ-ray spectrometer. A Ge(Li) detector has been used to determine the relative intensity of the 497 keVγ-ray in115Sn. As results have been deduced the 336 keVγ-ray emission per decay (N γ1/N 0=(45.9 ± 0.1)%), the total internal conversion coefficient (α=1.073 ± 0.014), theK-shell internal conversion coefficient (α K=0.843±0.012), the conversion ratioR=3.63±0.07, theβ −-transition per decay going to the ground state (N β1/N 0=(5.0 ± 0.7)%) and to the first excited level in115Sn115Sn(N β2/N 0=(0.047 ± 0.002)%), and the 497 keVγ-ray emission (N γ2/N γ1=(0.103 ± 0.004)%). From the obtained internal conversion data it follows that the 336 keVγ-ray transition is ofM4 character with anE5 admixture of less than (3.5±1.5)%. The half-life of the isomeric state115 mIn has been determined with four different methods. The result isT 1/2=(4.486±0.004) h.
Similar content being viewed by others
References
White, F.A., Collins, T.L., Rourke, F.M.: Phys. Rev.101, 1786 (1956)
Pauw, H.: Thesis, University of Amsterdam (1970)
Lederer, C.M., Hollander, J.M., Perlmian, I.: Table of isotopes. New York: John Wiley & Sons, Inc. 1967
Lawson, J.L., Cork, J.M.: Phys. Rev.57, 982 (1940)
Dunworth, J.V., Pontecorvo, B.: Proc. Cambridge Phil. Soc.43, 123 (1947)
Salisbury, S.R., Chalmers, R.A.: Phys. Rev.140, B 305 (1965)
Langer, L.M., Moffat, R.D., Graves, G.A.: Phys. Rev.86, 632A (1952)
Graeffe, G., Tang, C.-W., Coryell, C.D., Gordon, G.E.: Phys. Rev.149, 884 (1966)
Sehgal, M.L.: Phys. Rev.125, 968 (1962)
Murri, E.L., McIsaac, L.D., Helmer, R.G.: Phys. Rev.155, 1263 (1967)
Varma, J., Mandeville, C.E.: Phys. Rev.97, 977 (1955)
Antonova, I.A., Estulin, I.V.: J. Phys. Rad.16, 534 (1955)
Estulin, I.V., Moiseeva, E.M.: Sov. Phys. JETP1, 463 (1955)
Hans, H.S., Rao, G.N.: Nucl. Phys.44, 320 (1963)
Jha, S., Friedman, M., Patniak, B., Power, J.L.: Internal conversion processes, p. 327 (Hamilton, J.H., ed.). New York: Academic Press 1966
McDonald, J., Porter, D., Stewart, D.T.: Nucl. Phys. A104, 177 (1967)
Bäcklin, A., Fogelberg, B., Malmskog, S.G.: AE-263 (1967); Nucl. Phys. A96, 539 (1967)
Törkö, J.: Atompraxis12, 97 (1966)
Bellemare, M., Roy, J.C.: Nucl. Instr. Methods96, 209 (1971)
Grinberg, B., Brethon, J.P., Lagoutine, F., Le Gallic, Y., Legrand, J., Wapstra, A.H., Weiss, H.M., Bambynek, W., De Roost, E., Hansen, H.H., Spernol, A.: Atomic Energy Rev.11, 516 (1973)
Vaninbroukx, R., Grosse, G.: Int. J. Appl. Radiation Isotopes17, 41 (1966)
van der Eijk, W.: EUR-2248 (1965); Int. J. Appl. Radiation Isotopes17, 604 (1966)
Spernol, A., De Roost, E., Lerch, O.: EUR-477e (1964)
De Roost, E., Funck, E., Spernol, A.: Int. J. Appl. Radiation Isotopes20, 387 (1969)
Hansen, H.H., Delabaye, M.: Standardization of radionuclides, p. 361. Vienna: IAEA 1967
Hansen, H.H., Lowenthal, G., Spernol, A., van der Eijk, W., Vaninbroukx, R.: Z. Physik218, 25 (1969)
Hansen, H.H., De Roost, E., Mouchel, D., Vaninbroukx, R.: Intern. J. Appl. Radiation Isotopes22, 1 (1971)
Hansen, H.H., Spernol, A.: Radioactivity in nuclear spectroscopy, p. 695 (Hamilton, J.H., Manthuruthil, J.C., eds.). New York: Gordon and Breach 1972
Karlsson, S.-E, Andersson, I., Nilsson, Ö., Malmsten, G., Nordling, C., Siegbahn, K.: Nucl. Phys.89, 513 (1966)
Hager, R.S., Seltzer, E.C.: Nucl. Data A4, 1 (1968)
Dragoun, O., Plajner, Z., Schmutzler, F.: MPIH-1969-V5 (1969); Nucl. Data A9, 119 (1971)
Author information
Authors and Affiliations
Additional information
The authors like to thank Messrs. E. Celen, B. Denecke, G. Grosse, D. Mouchel, and W. Zehner for their assistance in the experimental work. Furthermore they are indepted to Mr. G. Bortels for the programming work for the half-life and theoretical internal conversion coefficient calculations.
Rights and permissions
About this article
Cite this article
Hansen, H.H., de Roost, E., van der Eijk, W. et al. The decay of115 mIn. Z. Physik 269, 155–161 (1974). https://doi.org/10.1007/BF01669057
Received:
Issue Date:
DOI: https://doi.org/10.1007/BF01669057