title: Effective nucleon mass in deformed nuclei
abstract: The coupling of vibrations to nucleons moving in levels lying close to the Fermi energy of deformed rotating nuclei is found to lead to a number of effects: (i) shifts of the single-particle levels of the order of 0.5 MeV towards the Fermi energy and thus to an increase of the level density, (ii) single-particle state depopulation of the order of 30%, and thus spectroscopic factors approximately 0.7, etc. These effects, which we have calculated for 168Yb, can be expressed in terms of an effective mass, the so-called omega mass ( m(omega)), which is approximately 40% larger than the bare nucleon mass in the ground state. It is found that m(omega) displays a strong dependence with rotational frequency, eventually approaching the bare mass for Planck's over 2piomega(rot) approximately 0.5-0.6 MeV.
authors.affiliation: Dipartimento di Fisica, Universita di Milano and INFN, Sezione di Milano, via Celoria 16, I-20133 Milano and The Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, DK-2100 Copenhagen O, Denmark.
authors.initials: P
authors.lastname: Donati
authors.initials: T
authors.lastname: Dossing
authors.initials: YR
authors.lastname: Shimizu
authors.initials: S
authors.lastname: Mizutori
authors.initials: PF
authors.lastname: Bortignon
authors.initials: RA
authors.lastname: Broglia