High-spin structure of the spherical nucleus 90Y

High-spin structure of the spherical nucleus 90Y

Rainovski, G.; Schwengner, R.; Schilling, K. D.; Wagner, A.; Jungclaus, A.; Galindo, E.; Thelen, O.; Napoli, D. R.; Ur, C.; de Angelis, G.; Axiotis, M.; Gadea, A.; Marginean, N.; Martinez, T.; Kröll, T.

High-spin states in 90Y were populated in the 82Se(11B,3n)
reaction at a beam energy of 37 MeV. Gamma rays were detected with the spectrometer GASP. The level scheme of 90Y was extended up to J^\pi = (18^+) at 9.6 MeV. Mean lifetimes of four levels were determined using the Doppler-shift-attenuation method. The structure of 90Y was
interpreted in terms of the shell model. The calculations were performed in the model space \pi(0f_{5/2},1p_{3/2},1p_{1/2},0g_{9/2})
\nu(1p_{1/2},0g_{9/2},1d_{5/2}) and in an extended space including the \nu(0g_{7/2})$ orbital as well. The calculations in the extended model space reveal a correspondence between states in ^{90}Y and ^{89}Y. Moreover, a combination of the predicted states with J^\pi \geq 14^(+) can be found
that reproduces the large B(M1) values of up to about 1 W.u.

Keywords: Nuclear structure; In-beam gamma-ray spectroscopy; Shell model

  • Physical Review C, Vol. 65, 044327

Permalink: https://www.hzdr.de/publications/Publ-4256
Publ.-Id: 4256