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Spin-isovector giant resonances induced by (n,p) reactions on heavy nuclei. |
Author
Long SA. Spicer BM. Raywood KJ. Abegg R. Alford WP. Celler A. Frekers D. Green PE. Hausser O. Helmer RL. Henderson RS. Hicks KH. Jackson KP. Jeppesen RG. King NSP. Miller CA. Moinester MA. Officer V
. Shute GG. Trudel A. Vetterli MC. Yavin AI. Yen S.
Institution
Sch. of Phys., Melbourne Univ., Parkville, Vic., Australia.
Title
Spin-isovector giant resonances induced by (n,p) reactions on heavy nuclei.
Source
Physical Review C-Nuclear Physics, vol.57, no.6, June 1998, pp.3191-202.
Publisher: APS through AIP, USA.
Abstract
Double differential cross sections from the /sup 120/Sn(n,p)/sup 120/In and /sup 181/Ta(n,p)/sup 181/Hf reactions at 298 MeV and the /sup 238/U(n,p)/sup 238/Pa reaction at 318 MeV have been measured
for excitation energies up to 50 MeV in the residual nucleus. These data, together with the previously published data from the /sup 90/Zr(n,p)/sup 90/Y and /sup 208/Pb(n,p)/sup 208/Tl reactions at 1
8 MeV, have been analyzed for spin-isovector resonances of multipolarities less than 7, using the multipole decomposition method. The strengths due to spin-isovector excitations of multipolarity les
than 4 have been extracted. The anomalous behavior of the extracted spin-isovector quadrupole strength with target mass number is discussed with reference to the calculations of Leonardi et al. The
cross section due to quasifree processes was calculated and subtracted from the data. The data after this subtraction were reanalyzed for spin-isovector resonances and the strengths due to multipola
ities up to 3 were extracted. The strengths due to spin-isovector dipole and octupole excitations were compared to values calculated, for 1h(cross) omega transitions only, using the sum rules of Mac
arlane. The behavior with target mass number is well represented by these sum rules. (38 References).
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Timo Kellmann
automatically created: July 2001
