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Investigation of neutron deficient nuclei in the region 28<N, Z <50 with the help of heavy ion compound reactions

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Zeitschrift für Physik

Abstract

In-beamγ ray spectroscopy withγ singles spectra,γγ coincidences andγ ray angular distributions has been performed with several target-projectile combinations:natCa +32S,natCa +40Ca,54Fe +14N,58Ni +12C,58Ni +14N,66Zn +16O,68Zn +16O. Level schemes of66Ge,68Ge,69As,70Se,74Kr,80Sr and82Sr have been deduced. The following level energies and spin-parity assignments have been found:66Ge: 957.4 keV, 2+; 1693.7; 2174.7, (4+); 3685.7; 4207.5;68Ge: 1015.8, 2+; 1777.9, 2+; 2267.9, 4+; 2428.8, 3(+); 2649.1, 3−; 3582.3, (5−); 3649.3, (5−); 3696.2, (6+); 3883.3, (6−); 4054.4, (7−); 4454.6; 4837.3;69As: 98.2; 164.6;789.6;863.2; 1306;2160;2210.4;2831.5;3258.3;3263.5;3991.1;5195.7;70Se: 945.4, 2+; 1600.9; 2039.4, (4+);74Kr: 455.7, 2+; 1013.5, (4+); 1781.5;80Sr: 385.4, 2+; 980.2, (4+); 1763.2, (6+);82Sr: 573.4, 2+; 1328.5,(4+); 2229.6,(6+).

γ ray activity spectra have been measured after the bombardment of natural Ca with32S. The half-life of the new isotope69Se has been found to be 27±3 sec.

Recoil distance Doppler-shift measurements have been performed with the reactions62,64Ni,66zn(16O, 2n)76, 78 Kr,80Sr. The following half-lives have been determined:76Kr: 423.8 keV, 2+, 37±5 psec; 1034.2,4+, 5.7±1.6;78Kr: 455.3, 2+, 25±3; 1120.0, 4+, 3.8±1;80Sr: 385.4, 2+, 44±6.

The energy and half-life systematics of the first excited state of even-even nuclei suggest a maximum of nuclear deformation in the region 28≦N, Z≦50 near 7638 Sr38 or 7840 Zr38.

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Author notes

  1. Y. Shida

    Present address: Institute for Nuclear Study, University of Tokyo, Tanashi-shi, Tokyo, Japan

Authors and Affiliations

  1. Physik-Department der Technischen Universität München, Federal Republic of Germany

    E. Nolte, Y. Shida, W. Kutschera, R. Prestele & H. Morinaga

Authors
  1. E. Nolte
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  2. Y. Shida
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  3. W. Kutschera
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  4. R. Prestele
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  5. H. Morinaga
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Additional information

We want to thank Dr. W. Dietrich for his help during the measurement and analysis, as well Dr. K. Miyano for the chemical separation for the Se experiment. A critical reading of the manuscript by Dr. M.R. Maier is grateful acknowledged.

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Nolte, E., Shida, Y., Kutschera, W. et al. Investigation of neutron deficient nuclei in the region 28<N, Z <50 with the help of heavy ion compound reactions. Z. Physik 268, 267–288 (1974). https://doi.org/10.1007/BF01669462

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  • DOI: https://doi.org/10.1007/BF01669462

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