The near proton drip-line nucleus [Formula Presented] was studied via in-beam [Formula Presented]-ray spectroscopy using the [Formula Presented] reaction at 190 MeV. We observed for the first time excited states above the known isomer in this nucleus, up to spin [Formula Presented] The observed band is assigned to a [Formula Presented] configuration and is discussed in the framework of the interacting boson-fermion-fermion model. The calculations and the experimental information suggest a spin [Formula Presented] for the lowest observed state. With such a spin assignment the moment of inertia of [Formula Presented] gets larger than in the heavier Pr isotopes, suggesting a sudden change in deformation close to the proton drip line. © 2001 The American Physical Society.
Spectroscopy near the proton drip line in the deformed [Formula Presented] mass region: The [Formula Presented] nucleus
Petrache C. M.;Lo Bianco G.;Blasi N.;Napoli D. R.;Saltarelli A.;
2001-01-01
Abstract
The near proton drip-line nucleus [Formula Presented] was studied via in-beam [Formula Presented]-ray spectroscopy using the [Formula Presented] reaction at 190 MeV. We observed for the first time excited states above the known isomer in this nucleus, up to spin [Formula Presented] The observed band is assigned to a [Formula Presented] configuration and is discussed in the framework of the interacting boson-fermion-fermion model. The calculations and the experimental information suggest a spin [Formula Presented] for the lowest observed state. With such a spin assignment the moment of inertia of [Formula Presented] gets larger than in the heavier Pr isotopes, suggesting a sudden change in deformation close to the proton drip line. © 2001 The American Physical Society.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
