This work was supported by the National Science Foundation Grant NSF PHY 78-22774 A02 & A03 and by Indiana Universit

Bacher, A.D.

Jacob, W.W.

Jones, W.P.

Nann, H.

Stephenson, E.J.

English

IUScholarWorks

2) J.R. Beene, Nuclear Data Sheets, 22, 27 (1977). 5 )  P.G. Bizzeti, A.M. Bizzeta-Sona, M. Bucciolini, R. 
Huber, W. Kutschera, H. Morinaga, R.A. Ricci, and C. 
3) A.R. Poletti, E.K. Warburton, J.W. Olness, J.J. Signorini, Nuovo Cim. z, 25 (1975). 
Kolata, and Ph. Gorodetzky, Phys. Rev. C g ,  1180 
(1976). 6) R.N. Boyd, S.L. Blatt, T.R. Donoghue, H.J. Hausman, 
E. Sugarbaker, and S.E. Vigdor, Proc. Fifth Int. 
4) J.W. Smits and R.H. Siemssen, Nucl. Phys. A261, 385 Symp. on Pol. Phenomena in Nuclear Physics, Santa 
(1976). Fe, 1980, in press. 
STUDY OF STRETCHED CONFIGURATION HIGH-SPIN STATES IN THE NICKEL REGION WITH 
THE(d,a) REACTION 
H. Nann, A.D. Bacher, W.W. Jacob, W.P. Jones, and E.J. Stephenson 
Indiana University Cyclotron Faculty, Bloomington, Indiana 47405 
Previous studies of the (~,d)l-~) and (d ,a)4 s 5, 
reactions have shown that, under suitable kinematic 
conditions, stretched configuration high-spin states 
are preferentially excited. This selectivity has been 
used in the present study of the (d,a) reaction on 
58 s60~i at 80 MeV bombarding energy to locate high-spin 
states in the final nuclei 56 ,58~o. Of special 
interest were transitions with La6 angular 
distributions which arise from the transfer of the 
2 proton-neutron pairs in the (lf712) J=7,~=0 or 
(lf7/21f5/2)J=6,~=0 configurations. A typical 
spectrum, taken with a 5 8 ~ i  target, is shown in Fig. 1. 
The dominant peak in the spectrum is the transition to 
the Jn = 7' state in 5 6 ~ o  at 2.28 MeV. This transition 
provides an experimental shape of an L=6 angular 
distribution (see Fig. 2) which can be used to identify 
other L=6 transitions. The transitions to the Jn = 5+ 
states in 5 6 ~ o  at 0.58 and 1.01 MeV exhibit clear L=4 
angular distributions (see Fig. 3) which are quite 
distinquishable from the observed L=6 pattern. Besides 
the aforementioned transition to the 7+ state at 2.28 
MeV in 56~0, the transitions to states at 2.37, 3.54 
and 4.44 MeV also show La6 angular distributions. 
These results have been used to test the 
predictions of recent multiconfiguration shell-model 
calculations by Glaudemans et a ~ . ~ )  based on two 
different interactions, the surface delta interaction 
(SDI) and a modified Kuo-Brown interaction (KB). 
Spectroscopic amplitudes were calculated for the 
transitions to the theoretical 5+, 5+2, 6+i, 7+i, and 
7+2 states in 5 6 ~ o  using only the strongest components 
in the wave functions of the initial and final states. 
With these spectroscopic amplitudes distorted-wave Born 
approximation (DWBA) calculations were performed and 
100 200 300 400 500 600 700 800 900 
CHANNEL NUMBER 
Figure 1. Alpha- 
particle spectrum for 
the 58~i(d,a)56~o 
reaction taken with the 
QDDM magnetic spectro- 
meter. 
' o o o o l  Ed=80  MeV 
F * Ed = 80 MeV 
Fi ure 2. Characteristic L-6 angular distributions for Fi ure 3 Characteristic L=4 angular distributions for 
&i(d,a)56Co reaction. h i d , a ) 5 6 C o  reaction. 
compared to the data. The resulting ratios of the fails to account for the strength of the transitions to 
experimental and calculated transition strengths are any of the high-spin states. The KB interaction 
shown in Table 1. The two interactions give quite predicts the relative transition strengths to the 6i 
different results. The SDI interaction essentially and 72 states quite well but underestimates the 
strengths for the first two 5+ states. In the 
60~i(d,a)58~o reaction, the transitions to the states 
at 2.69, 2.94, and 4.79 MeV in 5 8 ~ o  exhibit distinct 
L=6 patterns, whereas states at 0.03(5+), 0.37(5+) and 
5.04 MeV are excited with clear L=4 angular 
distributions. A comparison of the observed L=6 
transition strengths with the predictions of the two 
interactions shows that the SDI interaction splits the 
total (lf 7/2)-2 J=7 ,T=o transfer strength into many 
little pieces. In contrast, the KB interaction 
predicts a localization of the, 7+ transfer strength 
that is in considerably better agreement with the 
experimental results. 
1) E. Rivet, R.H. Pehl, J. Cerny, and B.G. Harvey, 
Phys. Rev. 141, 1021 (1965). 
2) H. Nann, W.S. Chien, A. Saha, and B.H. Wildenthal, 
Phys. Lett. E, 32 (1975). 
Table 1. 58~i(d ,a)56 co : Comparison of experimental 
transition strengths with microscopic DWBA predictions. 
The theoretical predictions are normalized to unity for 
the 2.28 MeV transition. 
&(M~v) uexp/ath 
SDI KB SDI KB 
3) H. Nann, W.S. Chien, A. Saha, and B.H. Wildenthal, 
Phys. Rev. C g ,  1959 (1977). 
4) N. Frascaria, J.P. Dideles, J.P. Garron, E. Gerlic, 
and J.C. Roynette, Phys. Rev. C g ,  1422 (1974). 
5) N. Frascaria, J.P. Dideles, N.S. Chant, and C.C. 
Chang, Phys. Rev. C g ,  603 (1977). 
6) P.W.M. Glaudemans et al., private communication. 
+ 
STUDY OF THE (d ,6Li) REACTION 
R.N. Boyd, E. Sugarbaker, S.L. Blatt, T.R. Donoghue and H.J. Hausman 
The Ohio State University, Physics Department, Columbus, Ohio 43212 
R.E. Brown and N. Stein 
Los Alamos Scientific Laboratory, Los Alamos, New Mexico 87545 
S.E. Vigdor 
Indiana University Cyclotron Facility, Bloomington, Indiana 47405 
+ 
The (dS6~i) reaction has been used for a number of 
years to study nuclear clustering phenomena. l) 
However, such studies have been limited by their 
inability to distinguish between shapes of the angular 
distributions of different R-transfers greater than 
about 4. Calculations which we have performed suggest 
that the vector analyzing powers obtained when such 
reactions are initiated with polarized incident 
deuteron beams might be extremely valuable in 
differentiating between much larger R-transfers than 
could be done with the cross sections alone. This 
might extend the usefulness of such experiments into a 
much higher angular momentum domain. 
We have therefore begun a program of study of the 
+ 
(dS6~i) reaction at Ed = 80 MeV. The polarized 
deuterons were produced by the IUCF polarized ion 
source, which gave a beam of about 50 nA on target. 
The beam vector polarization, typically about P, = 
4 


Study of Stretched Configuration High-Spin States in the Nickel Region with the (d,α) Reaction

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Study of Stretched Configuration High-Spin States in the Nickel Region with the (d,α) Reaction

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