Publications(January 2001 - December 2001)
- K. Kawahigashi, K. Nishida, A. Itabashi and M. Ichimura,
"Distorted wave impulse approximation analysis for
spin observables in nucleon quasielastic scattering and
enhancement of the spin longitudinal response," Phys.
Rev. C 63, (2001) 044609.
Abstract - We present
a formalism of distorted wave impulse approximation for
analyzing spin observables in nucleon inelastic and charge
exchange reactions leading to the continuum. It utilizes
response functions calculated by the continuum random
phase approximation. Using the formalism we analyzed the
spin-longitudinal and the spin-transverse cross sections,
IDq and IDp, of 12C, 40Ca (p,n) at 494 and 346 MeV. The
calculation reasonably reproduced the observed IDq, which
is consistent with the predicted enhancement of the spin-longitudinal
response function. However, the observed IDp is much larger
than the calculated one, which was consistent with neither
the predicted quenching nor the spin-transverse response
function obtained by the (e,e') scattering. The Landau-Migdal
parameters for the nucleon-Delta transition and the effective
mass at the nuclear center are treated as adjustable parameters.
- H. Sakai and M. Ichimura, "New development of research
for the nuclear spin-isospin responses," BUTURI
(the bulletin of the Japan physical society) Vol. 56 (2001)
492, (in Japanese).
Abstract - Atomic Nuclei
consist of protons and neutrons, which are characterized
by the isospin up and down respectively. They have the
ordinary spin 1/2. Therefore, the excitation modes, which
involve the spin and the isospin simultaneously, are a
specific nature of the nucleus. Recent development of
experimental technique about the high energy polarized
proton beam and the high efficiency neutron polarimeter
made great progress in investigation of the nuclear spin-isospin
modes. We reviewed the new facet developed by the investigation.
We especially focus on the contrast between the quenching
problem of the Gamov-Teller transition at low momentum
transfer region and the enhancement phenomena of the spin-longitudinal
response function in the high momentum transfer region.
One of the main aims is the unified understanding of the
superficially contradicting results in connection with
the effective nuclear interaction specified by the Landau-Migdal
- N. Onishi and M. Ichimura, "Quantum Mechanics,"
Nihon Housou Shuppan Kyoukai, 2001, Tokyo (in Japanese).
Abstract - This is the
textbook for the professional course lecture "Quantum
mechanics" in the Air-university, which is broadcast
by TV. Starting from the history of discovery and establishment
of Quantum Mechanics, we discussed the fundamental subjects
such as the hydrogen atom, uncertainty principle, spin
and statistics, atoms and molecules, scattering theory,
perturbation theory and absorption and emission of light.
At the end we reviewed the present understanding about
what and how nature is constructed by.