Spin correlation in pionnucleus reaetions
Project/Area Number  08640376 
Research Category 
GrantinAid for Scientific Research (C)

Section  一般 
Research Field 
素粒子・核・宇宙線

Research Institution  Nara Women's University 
Principal Investigator 
KUME Kenji Nara Women's University, Department of puysics, Professor, 理学部, 教授 (10107344)

Project Fiscal Year 
1996 – 1998

Project Status 
Completed(Fiscal Year 1998)

Budget Amount *help 
¥2,300,000 (Direct Cost : ¥2,300,000)
Fiscal Year 1998 : ¥300,000 (Direct Cost : ¥300,000)
Fiscal Year 1997 : ¥300,000 (Direct Cost : ¥300,000)
Fiscal Year 1996 : ¥1,700,000 (Direct Cost : ¥1,700,000)

Keywords  Pion / Nuclear reaction / Pion production reaction / momentum space / pionic atom / auxiliaryfield Monte Carlo / π中間子 / 原子核反応 / π中間子発生反応 / 運動量表示 / π中間子原子 / 補助場モンテカルロ / パイ中間子 / スピン相関 / 荷電交換反応 / 芯偏極 
Research Abstract 
I have obtained the following results. 1. I have carried out the finiterange DWBA calculation of the pion energy spectrum for (p, pi^) reactions near threshold for the first time. Good agreement with the experimental data is obtained. I have also made predictions of the (p, pi^) spectrum in higher energy region. 2. The parameters in the pionnucleus optical potential in lowenergy region is known to be difficult to determine uniquely due to the long wavelength of the pions. I have pointed out the possibility of fixing these parameters from the study of the quadrupole hyperfine component in deeply bound pionic atoms. 3. The wave equations such as Schrodinger or Dirac equations are often treated in the momentum space. In this case, the longrange Coulomb force causes numerical difficulty. We proposed a simple and quite accurate numerical method to treat the Coulomb force in momentum space. 4. We have analyzed the photodisintegration cross sections in ^3He and ^4He according to the phenomenological quasideuteron model. Our model successfully decribe the overall features of the recent experimental results. 5. We have developed a novel algorithm which enables us to treat the excitedstate properties of the quantum manybody system based on the auxiliaryfield Monte Carlo method. We have applied this method to some exactly solvably models and have examined the applicability of this method to realistic cases.

Report
(5results)
Research Output
(23results)