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C level structure by 
-ray spectroscopyHosomi, Kenji; Ma, Y.*; Ajimura, Shuhei*; Aoki, Kanae*; Dairaku, Seishi*; Fu, Y.*; Fujioka, Hiroyuki*; Futatsukawa, Kenta*; Imoto, Wataru*; Kakiguchi, Yutaka*; et al.
Progress of Theoretical and Experimental Physics (Internet), 2015(8), p.081D01_1 - 081D01_8, 2015/08
Times Cited Count：13 Percentile：70.14(Physics, Multidisciplinary)Level structure of the C hypernucleus was precisely determined by means of -ray spectroscopy. We identified four -ray transitions via the 
C
reaction using a germanium detector array, Hyperball2. The spacing of the ground-state doublet 
was measured to be 
(stat)
(syst)keV from the direct 
transition. Excitation energies of the 
and 
states were measured to be 
, keV and 
, keV, respectively. The obtained level energies provide definitive references for the reaction spectroscopy of 
hypernuclei.
ZnImai, Nobuaki*; Hirayama, Yoshikazu*; Ishiyama, Hironobu*; Jeong, S.-C.*; Miyatake, Hiroari*; Watanabe, Yutaka*; Makii, Hiroyuki; Mitsuoka, Shinichi; Nagae, Daisuke*; Nishinaka, Ichiro; et al.
European Physical Journal A, 46(2), p.157 - 160, 2010/11
Times Cited Count：3 Percentile：30.42(Physics, Nuclear)-ray spectroscopy of 
Cf by neutron-transfer reactions using a Cf targetTakahashi, Ryuta; Ishii, Tetsuro; Asai, Masato; Nagae, Daisuke*; Makii, Hiroyuki; Tsukada, Kazuaki; Toyoshima, Atsushi; Ishii, Yasuo; Matsuda, Makoto; Makishima, Akiyasu*; et al.
Physical Review C, 81(5), p.057303_1 - 057303_4, 2010/05
Times Cited Count：12 Percentile：64.15(Physics, Nuclear)The ground-state bands of Cf have been established up to 10
, 12, and 10 states, respectively, by in-beam -ray spectroscopy using neutron-transfer reactions with a 
O beam and a highly radioactive Cf target. The deexcitation rays in Cf were identified by taking coincidences with outgoing particles of 
O measured with Si 
-
detectors, and by selecting their kinetic energies. This is the first in-beam -ray spectroscopy for Cf isotopes.
states in 
Gd populated by the 
decay of EuNagae, Daisuke*; Ishii, Tetsuro; Takahashi, Ryuta*; Asai, Masato; Makii, Hiroyuki; Osa, Akihiko; Sato, Tetsuya; Ichikawa, Shinichi; Shimizu, Yoshifumi*; Shoji, Takuya*
AIP Conference Proceedings 1224, p.156 - 160, 2010/04
Times Cited Count：2 Percentile：65.93Nagae, Daisuke; Takemuara, Makoto*; Ueno, Hideki*; Kameda, Daisuke*; Asahi, Koichiro*; Yoshimi, Akihiro*; Sugimoto, Takashi*; Nagatomo, Takashi*; Kobayashi, Yoshio*; Uchida, Makoto*; et al.
no journal, ,
An electric quadrupole moment (
moment) is sensitive to collective aspects of nuclear structure. In the -moment measurement for unstable nuclei, we employ the -detected nuclear-quadrupole resonance method. In this method, we need to supply 
resonance frequencies, where 
denotes the nuclear spin. We have developed a new RF-application system to induced all of the transitions. The application of the frequencies may be pursued in two different ways; the sequential RF pulse method and the mixed-wave RF pulse method. We confirmed the reversal of polarization for the both methods, from measurements of -ray asymmetry change for polarized B. Using this system, the moments of 
Al have been measured to be 
mb and 
mb by the sequential RF pulse method.
Nagae, Daisuke; Ishii, Tetsuro; Makii, Hiroyuki*; Takahashi, Ryuta
no journal, ,
Construction of a linear ion trap is now in progress at JAEA-ISOL. We trapped 
Na, 
Rb, and 
Cs ions successfully. We will talk about a development of the trap.
Gd using a total absorption detectorAsai, Masato; Hayashi, Hiroaki*; Osa, Akihiko; Sato, Tetsuya; Otokawa, Yoshinori; Nagae, Daisuke; Tsukada, Kazuaki; Miyashita, Yuji*; Ouchi, Hiroyuki*; Izumi, Sayaka*; et al.
no journal, ,
We have developed a new method to measure lifetime of long-lived isomers populated through the decay, using a total absorption detector. Using this method, we have determined lifetime of the K isomers in 
Gd and 
Gd for the first time. The short-lived neutron-rich nuclei Eu and Eu were produced and mass-separated by the on-line isotope separator (ISOL) at JAEA tandem accelerator facility. Beta- and rays emitted by the decay of Eu were total-absorbed by the detector, and all the events were recorded with time stamps. This method enabled us to determine lifetime of the isomers with more than 100-
s lifetime.
Nagae, Daisuke; Ishii, Tetsuro; Makii, Hiroyuki*; Takahashi, Ryuta; Ichikawa, Shinichi; Osa, Akihiko; Otokawa, Yoshinori
no journal, ,
no abstracts in English
-ray spectroscopy of Cf using neutron-transfer reactionsTakahashi, Ryuta; Ishii, Tetsuro; Nagae, Daisuke; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Ishii, Yasuo; Matsuda, Makoto; Shizuma, Toshiyuki; Makii, Hiroyuki*; et al.
no journal, ,
no abstracts in English
Zn by thick target inverse kinematics proton resonance scatteringImai, Nobuaki*; Hirayama, Yoshikazu*; Ishiyama, Hironobu*; Jeong, S.-C.*; Miyatake, Hiroari*; Watanabe, Yutaka*; Makii, Hiroyuki; Mitsuoka, Shinichi; Nagae, Daisuke; Nishinaka, Ichiro; et al.
no journal, ,
The isobaric analog resonance of Zn was investigated by resonance elastic scattering of p(Zn,p) with a 5.5 MeV/nucleon Zn beam and a thick CH
target at JAEA tandem accelerator facility. Excitation function of the differential cross section of proton elastic scattering was measured around 0 degree in the laboratory frame. Angular momentum, and proton and total widths of the resonance determined using 
-matrix calculation are in good agreement with earlier measurements performed in normal kinematics.
Sugiyama, Koichi*; Go, Shintaro*; Tomimatsu, Taro*; Kai, Tamito*; Nagae, Daisuke*; Ishibashi, Yuichi*; Matsunaga, Sotaro*; Nagata, Yuto*; Nishibata, Hiroki*; Washiyama, Kohei*; et al.
no journal, ,
We have successfully performed in-beam gamma-ray spectroscopy using the isomer-scope technique to study excited-state structure of neutron-rich heavy-actinide nuclei. The neutron-rich heavy-actinide nuclei were produced in the multinucleon-transfer reactions with a 
Cm target and O projectiles accelerated with the JAEA tandem accelerator. Projectile-like scattered particles were detected with Si E-
E telescopes placed at the backward angle, and target-like scattered particles of isomers were caught by an annular aluminum plate placed at about 60-mm downstream from the target. Four Ge detectors and 4 LaBr detectors were placed at the periphery of the aluminum plate, and detected gamma rays from the isomers. Gamma rays emitted from the actinide isomers were successfully observed with a good sensitivity owing to the tungsten shield placed between the target and the detectors.
