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VI Reunião de Trabalho Física Nuclear.pdf - Sociedade Brasileira ...

VI Reunião de Trabalho Física Nuclear.pdf - Sociedade Brasileira ...

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c......<br />

a 8 a 8 I . 1 ... 8<br />

L 8? / 1 .4- /<br />

t<br />

il<br />

li. -------:, . -_, ...--------:<br />

6 1<br />

Fig. 7 - Spectra and a -- for the system 16 0 + A Sm. (From<br />

R<br />

Ref. 11).<br />

. 20 Ne .14 A'sm<br />

A=148, ISO and 152 11) . The strength of the<br />

coupling of the elastic 0 + channel to the 2 + state increases<br />

gradually from vibrational ( 148 Sm) to rotational ( 152 Sm), as<br />

is clearly seen in the 20 Ne-spectrum (Fig. (7.a)). Consequently<br />

N .4.<br />

the <strong>de</strong>population (absorption) in the 20 e 152 Sm is much<br />

stronger than either the 20Ne 150 Sm and 20<br />

Ne.4. 1485m. The<br />

0(14e+ 152 Sm)<br />

cross-section ratio reaches its smallest value<br />

O(Ne + 148 Sm)<br />

of -0.2 at back angles.<br />

The trend of the data clearly points to the presence<br />

of long-range absorption to be contrasted with the nuclear<br />

short-range absorption responsible for the diffractive behaviour<br />

discussed earlier. Actually the short range nuclear absorption,<br />

121

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