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ions with Ba atomsIemura, K.*; Otani, Shunsuke*; Suzuki, H.*; Takeda, Junichi*; Machida, Shuichi*; Tanabe, K.*; Takayanagi, Toshinobu*; Wakiya, K.*; Sekiguchi, M.*; Kanai, Yasuyuki*; et al.
Physical Review A, 64(6), p.062709_1 - 062709_14, 2001/12
Times Cited Count：6 Percentile：35.7(Optics)We measured ejected electron spectra caused by autoionization of doubly excited states in He atoms; the excited He was made by double electron capture of low-energy He ions colliding with Ba atoms. Measurements were performed by means of zero degree electron spectroscopy at projectile energies from 40 to 20 keV. Electron spectra due to autoionization from the states He(2lnl) to He+(1s) for n
2, and those from He(3lnl) to He
(2s or 2p) for n3, were observed. Line peaks in the spectra were identified by comparing observed electron spectra with those of several theoretical calculations. It was found that doubly excited states of relatively high angular momenta such as the D and F terms were conspicuously created in a quite different manner from the cases of the production of doubly excited states by the use of photon, electron, or ion impacts on neutral He atoms. Rydberg states with large n values were observed with high population in both the He(2lnl) and He(3lnl) series.
ions with aklaline-earth atomsIemura, K.*; Suzuki, H.*; Otani, Shunsuke*; Takeda, Junichi*; Takayanagi, Toshinobu*; Wakiya, K.*; Sekiguchi, M.*; Kanai, Yasuyuki*; Kitazawa, Shinichi; Tong, X. M.*; et al.
Atomic Collision Research in Japan, No.25, p.42 - 43, 1999/11
no abstracts in English
Kitazawa, Shinichi; *; *; *; Machida, Shuichi*; *; Wakiya, K.*; *; F.Currel*; *; et al.
Atomic Collision Research in Japan, (24), p.70 - 72, 1998/00
no abstracts in English
(1s
3l3l',1s3l4l') produced by low energy N
+He, Ne and Ar collisionsKitazawa, Shinichi; *; Machida, Shuichi*; Matsui, Y.*; Ida, H.*; *; Wakiya, K.*; *; F.Currell*; *; et al.
Journal of Physics B; Atomic, Molecular and Optical Physics, 31(14), p.3233 - 3243, 1998/00
Times Cited Count：9 Percentile：47.62(Optics)no abstracts in English
nln'l' of C ions produced by collisions of C
ions with alkaline-earth atomsMachida, Shuichi*; *; *; Wakiya, K.*; *; *; *; Kitazawa, Shinichi; Sekiguchi, M.*
Atomic Collision Research in Japan;Progress Report, (23), p.36 - 37, 1997/00
no abstracts in English
-He, Ne, Ar and N-He, Ne, Ar, collisionsKitazawa, Shinichi; *; *; *; *; Sekiguchi, M.*; *; Wakiya, K.*; Machida, Shuichi*
Phys. Scr., T73, p.207 - 208, 1997/00
Times Cited Count：1 Percentile：19.24(Physics, Multidisciplinary)no abstracts in English
nln´l´ of Be-like ions produced by collisions of O and C ions with alkali earth atomsMachida, Shuichi*; *; *; Wakiya, K.*; *; *; *; *; Kitazawa, Shinichi; Sekiguchi, M.*; et al.
Atomic Collision Research in Japan,No. 22, 0, p.49 - 50, 1996/00
no abstracts in English
Kitazawa, Shinichi; *; *; Sekiguchi, M.*
INS-J-182, 0, p.274 - 276, 1995/09
no abstracts in English
-He,Ne,Ar and N-He,Ne,Ar collisionsKitazawa, Shinichi; *; *; Matsui, Y.*; Ida, H.*; *; Wakiya, K.*; Sekiguchi, M.*
Annual Report 1994,Institute for Nuclear Study,University of Tokyo, 0, p.118 - 119, 1995/00
no abstracts in English
*; Endo, Masayuki*; Sekiguchi, Yoshiyuki*
PNC TN941 80-06, 83 Pages, 1980/01
This report describes the results of the power coefficient test (NT-34) that was planned and performed as a part of the power-up testing of the Experimental Fast Reactor "JOYO". The purpose of this test is to measure the reactivity chauge against the power increase (power coefficient) by measuring the reactor thermal power and excess reactivity at steps of the power ascension procedure. This testing was made from July through August in 1978, and the followings were confirmed. (1)The power coefficient was negative in all power range through 50MW rated power, and could be fitted with good reproducibility as follows. Power coefficient f
(%
K/K/MW) = -5.93 
10
P-6.05 (10
. P: Reactor thermal Power (MW) for 11MW ≦ P ≦ 53MW. The power coefficient was linear against the powar and became less negative with range 10MW (-6.610%K/K/MW) through 50MW (-9.010 %K/K/MW). (2)The experimental error was from +4.6% to -9.7%, and the dominant parts were the systematic errors. Particularly, the maximum error was derived from the difference of the thermal expansion between the extension pipes of the control rods and the reactor vessel. The error range was biased to the negative direction because the control rod worth used in this testing was seemed to be a few percent larger than the real worth by reasons of the change of the shadowiug effect, the change of the core fuel arrangement and the burn-up of control rods. (3)There was no significant difference between the results of the power ascent and descent. The reactor attained enough equilibrium of reactivity and thermal condition within about 20 minutes.
*; Endo, Masayuki*; *; *; *; Sekiguchi, Yoshiyuki*
PNC TN941 79-179, 198 Pages, 1979/10
This report describes the results of the thermal power calibration test (PT-11) that was planned and performed as part of the power-up testing of the Experimental Fast Reactor "JOYO". The purpose of this test is to calibrate the Power Range Monitors (PRM) and Intermediate Range Monitors (IRM) by measuring the reactor thermal power at several levels from low power through the rated power of 50 MWt. The reactor thermal power was determined by measuring the inlet and outlet temperature and the flow rate of the primary main coolant. After this procedure, PRM and IRM were adjusted to coincide with the reactor thermal power by regulating the electronic amplifiers. Thes testing was made from April through August 1978, and followings were confirmed. (1)The PRM indicators show good linearity with the reactor thermal power. (2)The PRM indicators overlap with the IRM indicators over more than three decades. (3)The PRM indicators changes depending on the operating histry of the reactor. The PRM indicators is lower than the reactor thermal power immediately after start-up. Then that increases gradually and comes to stable in about one week after start-up. The maximum drifting value is about 6 per cent.
Hirose, Tadashi*; Endo, Masayuki*; Nanashima, Takeshi*; Doi, Motoo*; Enomoto, Toshihiko*; Suzuki, Yukio*; Sekiguchi, Yoshiyuki*; Yamamoto, Hisashi*
PNC TN941 79-91, 81 Pages, 1978/12
This system is used to remove reactor decay heat in cases where the main cooling system is inoperable for unexpected reasons, a lower than normal sodium level exists in the R/V or during in-service inspection in the R/V. The purpose of this test is to verify that the design heat removal rate (2.6MWt) can be achieved by the Auxiliary cooling system. With the sodium level lowered below main cooling system outlet nozzles and the coolant temperature (DHX outlet temperature) controlled at 250 
C, the reactor power was increased first to approx. 1MW (1.16 MWt actual) and then to 2 MW (2.16 MWt actual) to provide the "decay heat". At both steps, steady-state conditions were verified and test data were recorded, from which the heat removal rate at design conditions was calculated. (Testing was terminated after the second step to maintain the calculated distortion of the partially-filled R/V within prescribed limits.) Test Results : At the second test condition (reactor power = 2.16 MWt) the R/V inlet Na temperature of 267 C corresponded to a 72% open DHX inlet vane setting. Extraporating this to the design condition (R/V inlet temperature = 370C), a 100% DHX vane opening would permit the removal of 3.1 MWt decay heat.
