Level structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Mo</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>89</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Abstract. Particle-T7 and 7y-coincidences of the reaction 58Ni(36Ar, 4pn)89Mo have been used to gain more information about high spin states in 89Mo and to establish the yrast sequence up to 7.6 MeV excitation energy and probable spin 37/2 h. Spins and parities were assigned on the basis of DCO-ratios measured with the OSIRIS spectrometer and a large volume Ge detector placed at 162 ~ to the beam. Furthermore, a y-ray angular distribution experiment was carried out using the reaction 58Ni(3sC1, 3 p n)89Mo. As in the neighboring isotopes 88Mo and 9~ the positive-parity high-spin states can be grouped into shell model multiplets characterized by increasing seniorities of proton particles and neutron holes in the 1 g9/2 shell. The negative-parity states can be explained with one nucleon moving in the Pl/2 orbit. The energies and wave functions of these states have been deduced by means of the shell model code RITSSCHIL. The 2584 keV (21/2 +) is an isomeric state the mean life of which has been estimated from delayed 77-coincidences.

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“…High-spin states in 89Mo have been presented by Garcia et al [9]. Their level scheme, however, terminates at 4 MeV excitation energy.…”

Section: The 89mo Level Schemementioning

confidence: 95%

“…A few excited low-spin states were established from /~-decay works [7,8]. Some high-spin levels were recently proposed, however, without unambiguous assignment of the final nucleus [9]. Even the spin and parity of the ground state (I ~ = 9/2 +) must be considered tentative.…”

Section: Motivationsmentioning

confidence: 98%