High-spin states and band terminations in ${}^{49}\mathrm{V}$

High-spin states in ${}^{49}\mathrm{V}$ have been studied through the ${}^{28}\mathrm{Si}$(${}^{28}\mathrm{Si},\alpha 3\mathrm{p}$) reaction using the EUROBALL $\gamma$-ray detector array. The ${}^{49}\mathrm{V}$ level scheme has been extended up to 13.1 MeV including 21 new states. Both negative and positive parity states have been interpreted in the framework of the shell model. The $27/2^{-}$ and the 31/$2{}^{+}$ band-termination states have been observed in agreement with theoretical predictions.

Figure 1

Level scheme proposed for ${}^{49}\mathrm{V}$.

Figure 2

Projection of the $E_{\gamma }\text{−}{E}_{\gamma }\text{−}{E}_{\gamma }$ matrix obtained with EUROBALL in conjunction with the RFD for the ${}^{28}\mathrm{Si}$ + ${}^{28}\mathrm{Si}$ reaction. The assignment of the strongest lines is indicated.

Figure 3

Experimental DCO ratios. Horizontal lines correspond to theoretical values in the EUROBALL geometry for stretched quadrupole or $\mathrm{\Delta }I=0$ pure dipole transitions $\left(R_{DCO}\approx 1\right)$ and $\mathrm{\Delta }I=1$ pure dipole transitions $\left(R_{DCO}\approx 0.6\right)$.

Figure 4

Coincidence spectra gated on selected transitions which are indicated in each plot. In the upper panel, transitions marked with * correspond to the strongest transitions in the high spin structure on the upper right part of the level scheme. The inset in panel (b) corresponds to a compression of the spectrum by a factor of 4.

Figure 5

Comparison between experimental negative-parity states and shell model predictions.

Figure 6

Theoretical DCO ratio as a function of the mixing ratio for the 416.8 keV $19/2 {}^{-}$ → $17/2{}^{-}$ transition, gating on the 1241.2 keV $15/2 {}^{-}$ → $11/2{}^{-}$ transition. Horizontal lines correspond to the experimental DCO ratio limits.

Figure 7

Comparison between experimental positive-parity states and shell model predictions.