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Invariant Mass Spectroscopy for the Neutron Rich Nuclei
사토,추경호,방형찬,S. H. Choi,T. Nakamura,Y. Kondo,Y. Nakayama,N. Kobayashi,K. N. Tanaka,S. Deguchi,Y. Kawada,N. Tanaka,T. Sugimoto,T. Motobayashi,H. Sakurai,H. Otsu,N. Aoi,Y. Yanagisawa,S. Takeuchi,N. Fukuda 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.23
The neutron-rich carbon isotopes ^(19,17)C and a boron isotope ^(14)B are investigated respectively via proton inelastic and charge-exchange reactions on a liquid hydrogen target at around 70 MeV/nucleon at RIKEN. The invariant mass method in inverse kinematics involving coincidence detection of a charged fragment and a neutron both emitted at forward angles is employed to map the energy spectrum above the neutron decay threshold. Several resonance structures are revealed in the invariant mass spectra, and the nature for some of them is discussed from comparisons of differential cross section data with predictions of microscopic DWBA calculations based on spsdpf shell model wave functions and a recent parametrization of semi-microscopic nucleon-nucleus optical model potential (JLMB). By extrapolating the (p,n) cross sections leading to the 1^+ state at 1.27 MeV in ^(141)B to zero momentum transfer the Gamow-Teller transition strength is deduced. The value is found to compare well with that reported in a β-delayed neutron emission study.
Invariant Mass Spectroscopy for the Neutron Rich Nuclei
Satou, Y.,Tshoo, K.,Bhang, H. C.,Choi, S. H.,Nakamura, T.,Kondo, Y.,Nakayama, Y.,Kobayashi, N.,Tanaka, K. N.,Deguchi, S.,Kawada, Y.,Tanaka, N.,Sugimoto, T.,Motobayashi, T.,Sakurai, H.,Otsu, H.,Aoi, N. Korean Physical Society 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.2
Ju Han Lee,Nagashima, T.,Hasegawa, T.,Seiki Ohara,Sugimoto, N.,Young-Geun Han,Sang Bae Lee,Kikuchi, K. IEEE 2006 IEEE Photonics Technology Letters Vol.18 No.12
<P>We investigate the feasibility of the use of 1-m length of our fabricated bismuth oxide-based nonlinear fiber (Bi-NLF) for the implementation of a Mamyshev-type 2R regenerator that is based on self-phase-modulation-induced spectral broadening followed by spectral filtering, and evaluate the regeneration performance in both experimental and theoretical ways from a perspective of system application. Owing to the excellent dispersion and chi<SUP>(3)</SUP> nonlinearity characteristics of our 1-m-long Bi-NLF, a nonlinear S-shape power transfer curve is readily obtained. A Q-factor improvement of a noisy 10-Gb/s return-to-zero signal by 1.2 dB is achieved by use of the regenerator</P>