Cross-sections and analyzing powers for (p,n) reactions on He-3 and He-4 at 346-MeV - INSPIRE

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Cross-sections and analyzing powers for (p,n) reactions on He-3 and He-4 at 346-MeV

E. Ihara
(
- Kyushu U.
)
,
T. Wakasa
(
- Kyushu U.
)
,
M. Dozono
(
- Kyushu U.
)
,
K. Hatanaka
(
- Osaka U., Res. Ctr. Nucl. Phys.
)
,
T. Imamura
(
- Kyushu U.
)

Jul, 2008

17 pages

Published in:

Phys.Rev.C 78 (2008) 024607

e-Print:

0807.1504 [nucl-ex]

DOI:

10.1103/PhysRevC.78.024607

View in:

reference search4 citations

Citations per year

Abstract: (arXiv)

The cross-sections and analyzing powers for

(p,n)

reactions on

{}^{3}{\rm He}

and

{}^{4}{\rm He}

have been measured at a bombarding energy of

T_p

= 346 MeV and reaction angles of

\theta_{\rm lab}

=

9.4^{\circ}

--

27^{\circ}

. The energy transfer spectra for

{}^{3}{\rm He}(p,n)

at large

\theta_{\rm lab}

(

\ge

16^{\circ}

) are dominated by quasielastic contributions, and can be reasonably reproduced by plane-wave impulse approximation (PWIA) calculations for quasielastic scattering. By contrast, the known

L

= 1 resonances in

{}^{4}{\rm Li}

are clearly observed near the threshold in the

{}^{4}{\rm He}(p,n)

spectra. Because these contributions are remarkable at small angles, the energy spectra are significantly different from those expected for quasielastic scattering. The data are compared with the PWIA calculations, and it is found that the quasielastic contributions are dominant at large

\theta_{\rm lab}

(

\ge

22^{\circ}

). The nuclear correlation effects on the quasielastic peak for

{}^{4}{\rm He}(p,n)

are also discussed.

24.70.+s
25.10.+s
25.40.Kv
27.10.+h

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