Abstract
High spin states in theN=50 nucleus93Tc were reinvestigated by using the reaction64Zn (35Cl,4p 2n) at a beam energy of 140 MeV. This was done particularly with a view to observe anyγ rays upto 2.7 MeV which may have been missed in our earlier study where the experimental conditions were set to observeγ rays upto 2 MeV. We found four newγ rays of energy: 2484, 2164, 2130 and 69 keV. We have placed theseγ rays in the level scheme and it now gets extended to 49/2−. Though there is no substantial change in the level scheme, placing theγ rays in the level scheme has resulted into two important conclusions: (1) We have performed shell model calculations for93Tc nucleus within a model space which encompasses an enlarged proton configuration and allows for the excitation of the neutron across theN=50 core. The excitation of a single neutron across theN=50 core satisfactorily explains the new level scheme. (2) The energy of the 17/2− isomeric state is now unambiguously placed at 2185 keV.
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The help of M. Gupta, Pragya Das, S. Muralithar, G.O. Rodrigues and R.P. Singh during the experiments is gratefully acknowledged. Special thanks are due to Dr. S.K. Datta and Prof. A.P. Patro for helpful discussions. The constant encouragement by Prof. G.K. Mehta is appreciated. The excellent co-operation from the NSC Pelletron staff is acknowledged. Two of the authors, S.S.G. and S.B.P. would like to acknowledge the financial assistance from CSIR (India) and BRNS, respectively.
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Ghugre, S.S., Patel, S.B. & Bhowmik, R.K. Shell model study of high spin states in theN=50 nucleus93Tc. Z. Physik A - Hadrons and Nuclei 349, 33–37 (1994). https://doi.org/10.1007/BF01296330
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DOI: https://doi.org/10.1007/BF01296330