Papers - AKIMUNE Hidetoshi
-
The ''other'' giant dipole resonance: Evidence for the isoscalar giant dipole resonance in Pb-208 from inelastic alpha scattering at 0 degrees Reviewed
BF Davis, H Akimune, A Bacher, GPA Berg, CC Foster, M Fujiwara, U Garg, MN Harakeh, J Janecke, J Lissanti, K Pham, W Reviol, D Roberts, EJ Stephenson, Y Wang
NUCLEAR PHYSICS A 599 ( 1-2 ) C277 - C282 1996.3
Joint Work
Publisher：ELSEVIER SCIENCE BV
The isoscalar giant dipole resonance (ISGDR) in Pb-208 has been investigated using inelastic scattering of 200 MeV alpha particles at and near 0 degrees where the angular distribution of the ISGDR can be clearly differentiated from other modes. The ''difference of spectra'' technique was employed to separate the contribution from the high-energy octupole resonance (HEOR). Preliminary angular distribution data provide clear evidence for the ISGDR adjacent to the HEOR.
-
Isospin character of low-lying states in 56Fe
R. De Leo, H. Akimune, N. Blasi, I. Daito, Y. Fujita, M. Fujiwara, S. I. Hayakawa, S. Hatori, K. Hosono, H. Ikegami, T. Inomata, I. Katayama, K. Katori, L. Lagamba, S. Micheletti, S. Morinobu, T. Nakagawa, S. Nakayama, A. Narita, T. Noro, R. Perrino, M. Pignanelli, H. Sakaguchi, J. Takamatsu, A. Tamii, K. Tamura, M. Tanaka, A. Terakawa, T. Tohei, M. Tosaki, T. Yamagata, A. Yamagoshi, M. Yosimura, M. Yosoi
Physical Review C - Nuclear Physics 53 ( 6 ) 2718 - 2731 1996
Joint Work
Publisher：American Physical Society
Low-lying states in 56Fe, up to an excitation energy of about 4 MeV, have been investigated by means of inelastic proton and deuteron scattering experiments at Ep=65 and 400 MeV and at Ed=56 MeV, respectively. Measured cross sections and analyzing powers have been compared with coupled-channels calculations using collective form factors
calculations in both the Schrödinger and Dirac formalisms have been carried out for the proton data. For each probe, the matrix elements have been deduced for transitions from the ground state and from the 2+1 state to six quadrupole (2+) states to one octupole (3-1) and two hexadecapole (4+1 and 4+2) states. The obtained matrix elements and the previous values from y decay or electron inelastic scattering have been used to evaluate the isospin character of the transitions. To discuss the quadrupole mixed-symmetry states in 56Fe, the deduced neutron (Mn) and proton (Mp) components of the matrix elements, or equivalently the isoscalar (Ms) and isovector (Mv) parts, have been compared with theoretical calculations based on the neutron-proton interacting boson model and on the shell model evaluated in a full f-p configuration space. -
Direct Proton Decay from the Gamow-Teller Resonance in $^{208}$Bi Reviewed
H. Akimune, I. Daito, Y. Fujita, M. Fujiwara, M. B. Greenfield, M. N. Harakeh, T. Inomata, J. Janecke, K. Katori, S. Nakayama, H. Sakai, Y. Sakemi, M. Tanaka, M. Yosoi
Phys.Rev. C52 604 1995.11
Joint Work
-
Fragmentation and Splitting of Gamow-Teller Resonances in Sn($^{3}$He, t)Sb Charge-Exchange Reactions, A = 112-124 Reviewed
K. Pham, J. Janecke, D. A. Roberts, M. N. Harakeh, G. P. A. Berg, S. Chang, J. Liu, E. J. Stephenson, B. F. Davis, H. Akimune, M. Fujiwara
Phys.Rev. C51 526 1995.11
Joint Work
-
Zero-Degree Proton Inelastic Scattering to the 1$^{+}$, T = 0 and T = 1 States in $^{12}$C Reviewed
Y. Sakemi, H. Sakaguchi, M. Yosoi, H. Akimune, T. Takahashi, A. Yamagoshi, A. Tamii, M. Fujiwara, K. Hatanaka, K. Hosono, T. Noro, H. Togawa, I. Daito, Y. Fujita, T. Inomata
Phys.Rev. C51 3162 1995.11
Joint Work
-
Direct proton decay from the Gamow-Teller Resonance
H. Akimune, I. Daito, Y. Fujita, M. Fujiwara, M.B. Greenfield, M.N. Harakeh, T. Inomata, J. Janecke, K. Katori, S. Nakayama, H. Sakai, Y. Sakemi, M. Tanaka and M. Yosoi
Physical Review C 52 604 - 615 1995.7
Joint Work
-
FRAGMENTATION AND SPLITTING OF GAMOW-TELLER RESONANCES IN SN(HE-3,T)SB CHARGE-EXCHANGE REACTIONS, A=112-124 Reviewed
K PHAM, J JANECKE, DA ROBERTS, MN HARAKEH, GPA BERG, S CHANG, J LIU, EJ STEPHENSON, BF DAVIS, H AKIMUNE, M FUJIWARA
PHYSICAL REVIEW C 51 ( 2 ) 526 - 540 1995.2
-
Zero-degree proton inelastic scattering to the 1+, T=0 and T=1 states in C12 Reviewed
Y. Sakemi, H. Sakaguchi, M. Yosoi, H. Akimune, T. Takahashi, A. Yamagoshi, A. Tamii, M. Fujiwara, K. Hatanaka, K. Hosono, T. Noro, H. Togawa, I. Daito, Y. Fujita, T. Inomata
Physical Review C 51 ( 6 ) 3162 - 3168 1995
Joint Work
We have measured the zero-degree cross sections for proton inelastic scattering to the 1+, T=0 (12.7 MeV) and 1+, T=1 (15.1 MeV) states in C12 at 65, 100, 200, 300, and 400 MeV. The ratios of cross sections [dσ/dΩ(1+, T=0)]/[dσ/dΩ(1+,T=1)] at 0°are compared with the calculations in the distorted wave approximation using various effective nucleon-nucleon interactions. The experimental ratios are found to be smaller than the theoretical predictions. It was found that the experimental results were better described by modifying the isovector tensor terms of the effective interactions. © 1995 The American Physical Society.
-
Spin Excitation Strength from Proton Inelastic Scattering at Zero Degree Reviewed
Y. Sakemi, H. Sakaguchi, M. Yosoi, H. Akimune, T. Takahashi, A. Yamagoshi, A. Tamii, M. Fujiwara, K. Hatanaka, K. Hosono, T. Noro, H. Togawa, I. Daito, Y. Fujita, T. Inomata
Nucl.Phys. A577 33c 1994.11
Joint Work
-
Microscopic Structure of the Gamow-Teller Resonance in $^{208}$Bi Reviewed
H. Akimune, I. Daito, Y. Fujita, M. Fujiwara, M. B. Greenfield, M. N. Harakeh, T. Inomata, J. Janecke, K. Katori, S. Nakayama, H. Sakai, Y. Sakemi, M. Tanaka, M. Yosoi
Phys.Lett. 323B 107 1994.11
Joint Work
-
($^{3}$He, t) Charge-Exchange Reactions at E($^{3}$He) = 450 MeV, $\theta$=0$^\circ$ Reviewed
H. Akimune, I. Daito, Y. Fujita, M. Fujiwara, M. B. Greenfield, M. N. Harakeh, T. Inomata, J. Janecke, K. Katori, S. Nakayama, H. Sakai, Y. Sakemi, M. Tanaka, M. Yosoi
Nucl.Phys. A569 245c 1994.11
Joint Work
-
Microscopic Structure of the Gamow-Teller Resonance in $^{208}$Bi Reviewed
H. Akimune, I. Daito, Y. Fujita, M. Fujiwara, M. B. Greenfield, M. N. Harakeh, T. Inomata, J. Janecke, K. Katori, S. Nakayama, H. Sakai, Y. Sakemi, M. Tanaka, M. Yosoi
Nucl.Phys. A569 255c 1994.11
Joint Work
-
Looking for the Isoscalar Giant Dipole Resonance in $^{208}$Pb using Inelastic $\alpha$ Scattering at and Near 0$^\circ$ Reviewed
B. F. Davis, H. Akimune, A. Bacher, G. P. A. Berg, M. Fujiwara, U. Garg, M. N. Harakeh, J. Janecke, J. Lisantti, K. Pham, W. Reviol, D. Roberts, E. J. Stephenson, Y. Wang
Nucl.Phys. A569 325c 1994.11
Joint Work
-
Spin-Isospin Excitations in Nuclei via ($^{3}$He, t) Reactions at 450 MeV Reviewed
M. Fujiwara, H. Akimune, I. Daito, H. Ejiri, Y. Fujita, M. B. Greenfield, M. N. Harakeh, R. Hazama, T. Inomata, J. Janecke, N. Kudomi, K. Kume, S. Nakayama, K. Shinmyo, A. Tamii, M. Tanaka, H. Toyokawa, M. Yosoi
Nucl.Phys. A577 43c 1994.11
Joint Work
-
The ($^{3}$He, t(p-bar)) Reaction: A means to study the microscopic structure of spin-isospin modes Reviewed
M. N. Harakeh, H. Akimune, I. Daito, Y. Fujita, M. Fujiwara, M. B. Greenfield, T. Inomata, J. Janecke, K. Katori, S. Nakayama, H. Sakai, Y. Sakemi, M. Tanaka, M. Yosoi
Nucl.Phys. A577 57c 1994.11
Joint Work
-
Microscopic Structure of the Gamow-Teller Resonance in $^{208}$Bi
H. Akimune, I. Daito, Y. Fujita, M. Fujiwara, M. B. Greenfield, M. N. Harakeh, T. Inomata, J. Janecke, K. Katori, S. Nakayama, H. Sakai, Y. Sakemi, M. Tanaka, M. Yosoi
Phys.Lett. 323B 107 1994.11
-
ATOMIC CHARGE-EXCHANGE BETWEEN FAST HELIUM-IONS AND TARGETS FROM CARBON TO BISMUTH AT BETA=0.36 Reviewed
K DENNIS, H AKIMUNE, GPA BERG, S CHANG, B DAVIS, M FUJIWARA, MN HARAKEH, J JANECKE, J LIU, K PHAM, DA ROBERTS, EJ STEPHENSON
PHYSICAL REVIEW A 50 ( 5 ) 3992 - 3999 1994.11
-
Looking for the isoscalar giant dipole resonance in 208Pd using inelastic a scattering at and near O° Reviewed
B. F. Davis, H. Akimune, A. Bacher, G. P.A. Berg, M. Fujiwara, U. Garg, M. N. Harakeh, J. Jänecke, J. Ussanti, K. Pham, W. Reviol, D. Roberts, E. J. Stephenson, Y. Wang
Nuclear Physics, Section A 569 ( 1-2 ) 325 - 332 1994.3
Joint Work
The isoscalar giant dipole resonance (ISGDR) in 208Pb has been investigated using inelastic scattering of 200 MeV α particles at and near 0° where the angular distribution of the ISGDR can be clearly differentiated from other modes. The "difference of spectra" technique was employed to separate the contribution from the high-energy octupole resonance (HEOR). Results from a preliminary analysis of the data are consistent with the expected positions of the ISGOR and HEOR, as well as their expected angular distributions near 0°. © 1994.
-
Microscopic structure of the Gamow-Teller resonance in 208Bi Reviewed
H. Akimune, I. Daito, Y. Fujita, M. Fujiwara, M. B. Greenfield, M. N. Harakeh, T. Inomata, J. Jänecke, K. Katori, S. Nakayama, H. Sakai, Y. Sakemi, M. Tanaka, M. Yosoi
Nuclear Physics, Section A 569 ( 1-2 ) 255 - 265 1994.3
Joint Work
The 208Pb(3He,t)208Bi reaction has been studied with the RCNP ring cyclotron at E(3He) = 450 MeV using the magnetic spectrometer Grand Raiden at θ = 0°. The Gamow-Teller resonance is strongly excited at this bombarding energy. Its microscopic structure has been investigated by measuring the direct proton decay to the neutron-hole states in 207Pb. The branching ratio for proton emission of a few % is much smaller than that for the decay of the isobaric analog state. The total width of the Gamow-Teller resonance as well as its total and partial escape widths have been determined. Several recent theoretical estimates for the escape width differ from the measured values by factors of ~ 2.5. © 1994.
-
(HE-3,T) CHARGE-EXCHANGE REACTIONS AT E(HE-3)=450 MEV, THETA=0-DEGREES Reviewed
H AKIMUNE, DAITO, I, Y FUJITA, M FUJIWARA, MB GREENFIELD, MN HARAKEH, T INOMATA, J JANECKE, K KATORI, S NAKAYAMA, H SAKAI, Y SAKEMI, M TANAKA, M YOSOI
NUCLEAR PHYSICS A 569 ( 1-2 ) C245 - C254 1994.3
Joint Work
Publisher：ELSEVIER SCIENCE BV
Spin-isospin excitations in nuclei have been studied by means of the (He-3,t) reactions at 450 MeV on the targets Be-9, (nat)C, Si-28, Ni-58, Ni-62, Zr-90, Sn-118, Sn-120, 124Sn, and Sm-154. The new spectrometer ''Grand Raiden'' was employed for the (He-3,t) study for the first time. Observed (He-3,t) spectra at 0-degrees show remarkable similarity with those from the (p,n) results at intermediate energies, suggesting a simple direct reaction mechanism for the (He-3,t) reaction at 450 MeV. The Gamow-Teller (GT) resonances and the spin-flip DELTAL = 1 resonances are excited very strongly. A fine structure of the GT resonances in medium-heavy nuclei is observed with an energy resolution of 210 keV. It is demonstrated that the (He-3,t) reaction at 450 MeV is a powerful tool to study the spin-isospin excitations in nuclei.