This work was supported by National Science Foundation Grants PHY 76-84033A01, PHY 78-22774, and Indiana Universit

Becchetti, F.D.

Jacobs, W.W.

Jänecke, J.

Overway, D.J.

English

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STUDY OF THE (6~i,d) REACTION AT E(Li) = 90 MeV 
F.D. Becchetti*, W.W. Jacobs, J. JXnecke*, and D.J. Overway* 
We have begun a study of the (6~i,d) a-transfer including the a-decay width of the 9.6 MeV 1- level. 
reaction at high bombarding energy. The reactions 12c Limited data have also been obtained for 208~b 
(6~i,d) 160 and 208~b (6~i,d) 212~o have been investigated (6~i,d)2 12Po. A ground state cross section of about 
thus far and rather complete data obtained for the former 0.15 pb/sr is observed at 8=11°. There appears to be 
(Figs. 1 and 2). One observes a more selective popula- considerable a-transfer strength ("2 pb/sr) to excited 
tion of "a-cluster" levels in 160 (e.g. 6.9 MeV 2+, 10.4 levels in 212~o at Ex = 2.2 to 3.0 MeV (Fig. 3). These 
MeV 4'. Fig.1) than is observed with (6~i,d) at lower may correspond to certain preferred high-spin levels 
bombarding energies1 a2). Also the angular distributions with "stretched" configurations. Unfortunately con- 
to a-cluster levels are much more forward-peaked (Fig.2) taminant buildup is a problem for heavy targets. Im- 
including a large enhancement at 8=0°. The study of provements of the targets and spectrometer vacuum system 
2~ (6~i, d)160 is of particular interest in that the are planned and should permit further work on 208~b and 
a-widths of the JT = 1- levels at % = 7.1 MeV and 9.6 other heavy nuclei. 
MeV (Fig. 1) are important in stellar helium fusion2 9 3, . 
The data at E(Li) - 90 MeV should greatly help to clarify *Department of Physics, University of Michigan, Ann 
Arbor, MI 48109 
some anomalies observed at lower bombarding energies2) 
POSITION ALONG FOCAL PLANE 
Figure I .  Po~tions of a deuteron spectrum f m  2 ~ ( 6 ~ a d )  6~ in the vicini ty  of the O+(6.O MeV), 2+(6.9 MeV) 
and 4+(20.4 MeV) a-cluster rotational band i n  160. Note strength t o  2+(6.9 MeV) and 2' (7.1 MeV) ZeveZs 
relative t o  2' (8.9 MeV) level. The la t ter  i s  not aZZowed i n  a simple direct a-transfer. 
1) F.D. Becchetti, Proc. 3rd Conf. on Clustering 
(Winnipeg, 1978) p. 308 and references c i t ed  
therein. 
2) F.D. Becchetti, J.  Jgnecke and C . E .  Thorn, Nucl. 
Phys. A305 (1978) 313. 
P. Dyer 
495. 
and C.A. Barnes, Nucl . Phys . 
2 0 8 ~ b  hi, d)212~o 
E = 90 MeV 
8=11° 
I v Ln  [MeV) 2.5 2.2 1.5 0.7 g ~ .  
CHANNEL NUMBER 
Figure 3. Spectrum from '08pb (6~i ,  d)212~o.  The shaded 
regions represent contributions from contaminants i n  
the target, mainly 3 2 ~ ( ~ L i , d l  and 160 ( 6 ~ i , d ) .  
Figure 2. ExperimntaZ angulm, distributions. The 
curves shown connect data points and have no theoretical 
significance. 


Study of the (6-Li,d) Reaction at E(Li)=90 MeV

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Study of the (6-Li,d) Reaction at E(Li)=90 MeV

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