Publications(January 2002 - December 2002)
- M. Ichimura and K. Kawahigashi, "Pionic Modes Studied
by Quasielastic (p,n) Reactions," Challenge of
Nuclear Structure, (World Scientific Publishing Co.
Singapole, 2002), pp.531-538
Abstract - It has long
been expected that the pionic modes show some collective
phenomena such as the pion condensation in the high density
nuclear matter and its precursor phenomena in the ordinary
nuclei. Here we show an evidence of the precursor observed
in the isovector spin longitudinal cross sections ID_q
of the quasielastic 12C, 40Ca (p, n) reactions at T_p
= 346 and 494MeV with the momentum transfer q = 1.7fm^{-1}.
Another aim of this report is to evaluate the three kinds
of Landau-Migdal parameters at the large momentum region
from these reactions. We obtained g'_{NN} = 0.6-0.7, g'_{NΔ}
= 0.3-0.4. The results are consistent with those at the
small momentum region, which are obtained from the Gamov-Teller
strength distribution.
- M. Ichimura and K. Kawahigashi, "Enhancement of Pionic
Modes in the Quasielastic Region," Heavy Ion Physics,
Vol. 16 (2002) pp45-52.
Abstract - We found
an evidence for the precursor phenomena of the pion condensation
in the enhancement of the spin longitudinal cross sections
of the quasielastic region. They are observed by 12C,
40Ca(p, n) quasielastic scatterings at the incident energy
494 and 346MeV around transferred momentum close to the
critical one of the pion condensation.We utilized the
distorted wave impulse approximation incorporated with
the continuum random phase approximation. We adjusted
the Landau-Migdal parameters and obtained g'_{NN} = 0.6-0.7
and g'_{NΔ} = 0.3-0.4, which are consistent
with those obtained from the energy of the Gamov-Teller
giant resonance and the quenching factor of the Gamov-Teller
sum rule.
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