Study of the 90Zr(
)87Y reaction at 22
MeV
P. Guazzoni1 - M. Jaskola1 - L. Zetta1 - J.N. Gu2 - A. Vitturi2 - G. Graw3 - R. Hertenberger3 - P. Schiemenz3 - B. Valnion3 - U. Atzrott4 - G. Staudt4
1 Dipartimento di Fisica dell'Università and Istituto Nazionale
di Fisica Nucleare, via Celoria 16, I-20133 Milano, Italy
2 Dipartimento di Fisica dell'Università and Istituto Nazionale di Fisica
Nucleare, via Marzolo 8, I-35100 Padova, Italy
5 Sektion Physik der Universität München, D-85748 Garching, Germany
6 Physikalisches Institut der Universität, Auf der Morgenstelle 14, D-72076
Tübingen, Germany
Received: 17 November 1997 Communicated by D. Schwalm
Abstract
The () reaction on 90Zr has been studied in a high
resolution experiment at an incident proton energy of 22 MeV.
The cross section and asymmetry angular distributions for
transitions to 36 levels of 87Y with an excitation energy up to 3
MeV have been measured.
DWBA analyses of experimental angular distributions, using either Woods-Saxon
or Double Folded potentials for the exit channel, have
been done, allowing either the confirmation of previous spin and parity values
or the assignment of new spin and parity to a large
number of states. The structure of low lying states of 87Y
has been studied in the framework of the shell model, using the OXBASH code.
With the interaction PMM90 reasonable agreement is obtained for part of the
negative parity spectrum.
PACS
21.60.Fw Models based on group theory -
21.60.Ev Collective models -
27.60.+j -
25.40.Hs Transfer reactions -
21.60.Cs Shell model
Copyright Springer-Verlag