The near proton drip-line nucleus 126Pr was studied via in-beam gamma-ray spectroscopy using the 40Ca+92Mo reaction at 190 MeV. We observed for the first time excited states above the known isomer in this nucleus, up to spin 31. The observed band is assigned to a ph11/2 x nh11/2 configuration and is discussed in the framework of the interacting boson-fermion-fermion model. The calculations and the experimental information suggest a spin 8+ for the lowest obsaved state. With such a spin assignement the moment of inertia of 126Pr gets larger than in the heavier Pr isotopes, saggesting a sudden change in deformation close to the proton drip line.
Spectroscopy near the Proton Drip Line in the Deformed A = 130 Mass Region: the 126Pr Nucleus
Ventura, A.
2001-10-01
Abstract
The near proton drip-line nucleus 126Pr was studied via in-beam gamma-ray spectroscopy using the 40Ca+92Mo reaction at 190 MeV. We observed for the first time excited states above the known isomer in this nucleus, up to spin 31. The observed band is assigned to a ph11/2 x nh11/2 configuration and is discussed in the framework of the interacting boson-fermion-fermion model. The calculations and the experimental information suggest a spin 8+ for the lowest obsaved state. With such a spin assignement the moment of inertia of 126Pr gets larger than in the heavier Pr isotopes, saggesting a sudden change in deformation close to the proton drip line.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
