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Journal Articles

In-beam $$gamma$$-ray spectroscopy of $$^{248,250,252}$$Cf by neutron-transfer reactions using a Cf target

Takahashi, 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

https://doi.org/10.1103/PhysRevC.81.057303
 Times Cited Count：16 Percentile：66.30(Physics, Nuclear)

The ground-state bands of $$^{248,250,252}$$Cf have been established up to 10$$^{+}$$, 12$$^{+}$$, and 10$$^{+}$$ states, respectively, by in-beam $$gamma$$-ray spectroscopy using neutron-transfer reactions with a $$^{18}$$O beam and a highly radioactive Cf target. The deexcitation $$gamma$$ rays in $$^{248,250,252}$$Cf were identified by taking coincidences with outgoing particles of $$^{16-19}$$O measured with Si $$Delta E$$-$$E$$ detectors, and by selecting their kinetic energies. This is the first in-beam $$gamma$$-ray spectroscopy for Cf isotopes.

Journal Articles

Observation of high-$$j$$ quasiparticle states in $$^{249}$$Cm by in-beam $$gamma$$-ray spectroscopy using heavy-ion transfer reactions

Ishii, Tetsuro; Makii, Hiroyuki*; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Matsuda, Makoto; Makishima, Akiyasu*; Shigematsu, Soichiro*; Kaneko, Junichi*; Shizuma, Toshiyuki; et al.

Physical Review C, 78(5), p.054309_1 - 054309_11, 2008/11

https://doi.org/10.1103/PhysRevC.78.054309
 Times Cited Count：16 Percentile：66.71(Physics, Nuclear)

Journal Articles

In-beam $$gamma$$-ray spectroscopy of neutron-rich nuclei in the uranium region through the heavy-ion transfer reaction

Ishii, Tetsuro; Makii, Hiroyuki; Asai, Masato; Koura, Hiroyuki; Shigematsu, Soichiro*; Tsukada, Kazuaki; Toyoshima, Atsushi; Matsuda, Makoto; Makishima, Akiyasu*; Shizuma, Toshiyuki; et al.

Nuclear Physics A, 805(1-4), p.257 - 259, 2008/06

https://doi.org/10.1016/j.nuclphysa.2008.02.090

no abstracts in English

Journal Articles

Z dependence of the $$N = 152$$ deformed shell gap; In-beam $$gamma$$-ray spectroscopy of neutron-rich $$^{245, 246}$$Pu

Makii, Hiroyuki; Ishii, Tetsuro; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Matsuda, Makoto; Makishima, Akiyasu*; Kaneko, Junichi*; Tome, Hayato*; Ichikawa, Shinichi; et al.

Physical Review C, 76(6), p.061301_1 - 061301_5, 2007/12

https://doi.org/10.1103/PhysRevC.76.061301
 Times Cited Count：35 Percentile：86.42(Physics, Nuclear)

We have measured deexcitation $$gamma$$ rays for the first time in the neutron-rich nuclei of $$^{246}$$Pu$$_{152}$$ and $$^{245}$$Pu$$_{151}$$ produced by the ($$^{18}$$O, $$^{16}$$O) and the ($$^{18}$$O, $$^{17}$$O) reactions, respectively. The ground-state band of $$^{246}$$Pu was established up to 12$$^{+}$$ states. The systematics of the moments of inertia of $$_{94}$$Pu isotopes suggests that the $$N = 152$$ deformed subshell closure disappears in these isotopes. The measurements of deexcitation $$gamma$$ rays in $$^{245}$$Pu shows a small energy spacing between neutron orbitals at $$N = 152$$, which explans the disappearance of the subshell closure.

Journal Articles

In-beam $$gamma$$-ray study of the neutron-rich nuclei of $$^{240}$$U, $$^{246}$$Pu, and $$^{250}$$Cm produced by the ($$^{18}$$O, $$^{16}$$O) reaction

Ishii, Tetsuro; Shigematsu, Soichiro*; Makii, Hiroyuki; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Matsuda, Makoto; Makishima, Akiyasu*; Shizuma, Toshiyuki; Kaneko, Junichi*; et al.

Physics of Atomic Nuclei, 70(8), p.1457 - 1461, 2007/08

https://doi.org/10.1134/S1063778807080224
 Times Cited Count：12 Percentile：62.39(Physics, Nuclear)

We have measured deexcitation $$gamma$$ rays in the neutron-rich nuclei of $$^{240}$$U, $$^{246}$$Pu and $$^{250}$$Cm. These nuclei were produced by the ($$^{18}$$O, $$^{16}$$O) two-neutron transfer reactions with a 200, 162 and 162 MeV $$^{18}$$O beams and a $$^{238}$$U, $$^{244}$$Pu and $$^{248}$$Cm targets, respectively, using the tandem accelerator at Tokai, Japan. The $$gamma$$ rays in residual nuclei were measured by taking coincidence with scattering particles using Si $$Delta E$$-$$E$$ detectors. We have identified $$gamma$$ rays in $$^{240}$$U, $$^{246}$$Pu and $$^{250}$$Cm by selecting the kinetic energies of $$^{16}$$O particles which correspond to the excitation energies in these nuclei below their neutron separation energies. The ground-state bands of $$^{240}$$U, $$^{246}$$Pu and $$^{250}$$Cm were established up to 12$$^{+}$$ states and the $$K^{pi}=0^{-}$$ octupole band of $$^{240}$$U was established up to 9$$^{-}$$ state. Because the deformations of these nuclei are well developed, the moments of inertia reflect the pairing gap, which is expected to be smaller, resulting in a larger moment of inertia, at the deformed shell closure. We have found that the moment of inertia of the ground-state band of $$^{248}$$Cm$$_{152}$$ is considerably larger than that of $$^{250}$$Cm$$_{154}$$. This fact supports the existence of the deformed subshell closure at $$N=152$$ in Cm isotopes. On the other hand, the moment of inertia of $$^{246}$$Pu$$_{152}$$ was found to be smaller than that of $$^{244}$$Pu$$_{150}$$, which suggests that the deformed subshell closure at $$N=152$$ weakens or disappears in Pu isotopes. These results are consistent with the prediction by a cranking model calculation.

Journal Articles

Ground-state bands of neutron-rich $$^{236}$$Th and $$^{242}$$U nuclei and implication of spherical shell closure at $$N=164$$

Ishii, Tetsuro; Makii, Hiroyuki; Asai, Masato; Koura, Hiroyuki; Shigematsu, Soichiro*; Tsukada, Kazuaki; Toyoshima, Atsushi; Matsuda, Makoto; Makishima, Akiyasu*; Kaneko, Junichi*; et al.

Physical Review C, 76(1), p.011303_1 - 011303_5, 2007/07

https://doi.org/10.1103/PhysRevC.76.011303
 Times Cited Count：15 Percentile：68.14(Physics, Nuclear)

The ground-state bands of the neutron-rich $$^{236}$$Th and $$^{242}$$U nuclei were established up to spin 10 and 8, respectively, by in-beam $$gamma$$-ray spectroscopy using the ($$^{18}$$O, $$^{20}$$Ne) two-proton pickup reaction with a $$^{238}$$U and a $$^{244}$$Pu target. Deexcitation $$gamma$$ rays in $$^{236}$$Th and $$^{242}$$U were identified by selecting the kinetic energies of $$^{20}$$Ne using Si $$Delta E$$-$$E$$ detectors. The excitation energies of the first 2$$^{+}$$ states in U and Pu isotopes have local minima at $$N simeq 146$$, suggesting the possibility that nuclei with $$Z simeq 92$$ have a spherical shell closure of $$N=164$$. Calculation using the Koura-Yamada single-particle potential gives an energy gap of 1.8 MeV at $$N=164$$ for $$^{256}$$U.

Journal Articles

Ground-state band of the neutron-rich transuranium nucleus $$^{250}$$Cm$$_{154}$$

Ishii, Tetsuro; Shigematsu, Soichiro; Makii, Hiroyuki; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Matsuda, Makoto; Makishima, Akiyasu*; Shizuma, Toshiyuki; Kaneko, Junichi*; et al.

Journal of the Physical Society of Japan, 75(4), p.043201_1 - 043201_4, 2006/04

https://doi.org/10.1143/JPSJ.75.043201
 Times Cited Count：20 Percentile：68.33(Physics, Multidisciplinary)

The ground-state band of the neutron-rich transuranium nucleus $$^{250}$$Cm was established up to spin 12 by in-beam $$gamma$$-ray spectroscopy using the two-neutron-transfer reaction with a $$^{248}$$Cm target and a 162 MeV $$^{18}$$O beam. Deexcitation $$gamma$$ rays in $$^{250}$$Cm were identified by selecting the kinetic energies of $$^{16}$$O particles with Si $$Delta E$$-$$E$$ detectors. The moment of inertia of $$^{250}$$Cm$$_{154}$$ is considerably smaller than that of $$^{248}$$Cm$$_{152}$$, which supports the existence of the deformed subshell closure at $$N=152$$ in Cm isotopes.

Journal Articles

In-beam $$gamma$$-ray spectroscopy of $$^{240}$$U using the ($$^{18}$$O,$$^{16}$$O) reaction

Ishii, Tetsuro; Shigematsu, Soichiro; Asai, Masato; Makishima, Akiyasu*; Matsuda, Makoto; Kaneko, Junichi*; Hossain, I.*; Ichikawa, Shinichi; Kono, Toshiyuki*; Ogawa, Masao*

Physical Review C, 72(2), p.021301_1 - 021301_5, 2005/08

https://doi.org/10.1103/PhysRevC.72.021301
 Times Cited Count：21 Percentile：76.36(Physics, Nuclear)

In the two-neutron-transfer reaction of a 200-MeV $$^{18}$$O beam with a $$^{238}$$U target, deexcitation $$gamma$$ rays in a neutron-rich nucleus of $$^{240}$$U were measured. The $$gamma$$ rays in $$^{240}$$U were identified by taking coincidence with $$^{16}$$O, using Si $$Delta E$$-$$E$$ detectors. The kinetic energies of $$^{16}$$O particles allowed us to select the excitation energies of $$^{240}$$U below the neutron separation energy. The ground-state band and the $$K^{pi}=0^{-}$$ octupole band of $$^{240}$$U were established up to 12$$^{+}$$ and 9$$^{-}$$, respectively. The octupole-band head of $$^{240}$$U is higher than those of $$^{236,238}$$U by about a hundred keV, suggesting that a secondary maximum of octupole correlations exists at $$N=144-146$$ in U isotopes.

JAEA Reports

Burn-up measurement of irradiated rock-like fuels

Shirasu, Noriko; Yamashita, Toshiyuki; Kanazawa, Hiroyuki; Kimura, Yasuhiko; Sudo, Kenji; Magara, Masaaki; Inagawa, Jun; Kono, Nobuaki; Nakahara, Yoshinori

JAERI-Research 2001-018, 23 Pages, 2001/03

JAERI-Research-2001-018.pdf:1.48MB

no abstracts in English

JAEA Reports

Evaluation of ferromagnetic materials for induction linacs

Hashimoto, Dai; Morimoto, Iwao; Zheng, X.; Maebara, Sunao; Nakajima, Mitsuo*; Horioka, Kazuhiko*; Kono, Toshiyuki*; Shiho, Makoto

JAERI-Research 2000-018, p.66 - 0, 2000/03

JAERI-Research-2000-018.pdf:2.19MB

no abstracts in English

Journal Articles

Isomer-scope: A new instrument for in-beam $$gamma$$-ray spectroscopy through deep inelastic collisions

Ishii, Tetsuro; ; ; Makishima, Akiyasu*; Hossain, I.*; Hayakawa, Takehito*; Kono, Toshiyuki*; Ogawa, Masao*

Nuclear Instruments and Methods in Physics Research A, 395(2), p.210 - 216, 1997/00

https://doi.org/10.1016/S0168-9002(97)00720-1
 Times Cited Count：45 Percentile：93.12(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Development of a New Measurement Method for Fast Breeder Reactor Fuel Burnup Using a Shielded lon Microprobe Analyzer

Mizuno, Mino*; Enokido, Yuji; Unno, Ichiro; Kono, Kenichi; Yamanouchi, Sadamu; Itaki, Toshiyuki

Nuclear Technology, 69(1), p.107 - 113, 1985/00

https://doi.org/10.13182/NT85-A33600
 Times Cited Count：0 Percentile：0.00(Nuclear Science & Technology)

None

Oral presentation

In-beam $$gamma$$-ray measurement of the neutron-rich nucleus $$^{250}_{96}$$Cm$$_{154}$$

Ishii, Tetsuro; Shigematsu, Soichiro; Makii, Hiroyuki; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Matsuda, Makoto; Makishima, Akiyasu*; Shizuma, Toshiyuki; Kaneko, Junichi*; et al.

no journal, , 

no abstracts in English

Oral presentation

In-beam $$gamma$$-ray spectroscopy of the neutron-rich $$^{236}$$Th and $$^{242}$$U nuclei produced by the ($$^{18}$$O,$$^{20}$$Ne) reaction

Ishii, Tetsuro; Makii, Hiroyuki; Asai, Masato; Shigematsu, Soichiro*; Tsukada, Kazuaki; Toyoshima, Atsushi; Matsuda, Makoto; Makishima, Akiyasu*; Kaneko, Junichi*; Tome, Hayato; et al.

no journal, , 

no abstracts in English

Oral presentation

In-beam $$gamma$$-ray spectroscopy of neutron-rich $$^{245,246}$$Pu and properties of $$N = 152$$ deformed shell closure

Makii, Hiroyuki; Ishii, Tetsuro; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Matsuda, Makoto; Makishima, Akiyasu*; Kaneko, Junichi*; Tome, Hayato; Ichikawa, Shinichi; et al.

no journal, , 

We have measured in-beam $$gamma$$ rays in the neutron-rich $$^{246}$$Pu$$_{152}$$ and $$^{245}$$Pu$$_{151}$$ nuclei by means of $$^{244}$$Pu($$^{18}$$O, $$^{16}$$O)$$^{246}$$Pu and $$^{244}$$Pu($$^{18}$$O, $$^{17}$$O)$$^{245}$$Pu neutron transfer reactions, respectively. The ground-state band of $$^{246}$$Pu was established up to the $$12^+$$ state. The systematics of the 2$$^+$$ energies for the ground-state bands of Pu isotopes suggests that the $$N = 152$$ deformed shell closure disappears in Pu. The measurement of deexcitation $$gamma$$ rays in $$^{245}$$Pu shows a small energy spacing between the neutron orbitals at $$N = 152$$, which explains the disappearance of the shell closure.

Oral presentation

High-j quasi-particle states in $$^{249}$$Cm

Ishii, Tetsuro; Makii, Hiroyuki; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Matsuda, Makoto; Shizuma, Toshiyuki; Makishima, Akiyasu*; Tome, Hayato*; Shigematsu, Soichiro*; et al.

no journal, , 

no abstracts in English

Oral presentation

In beam $$gamma$$-ray measurement of the neutron-rich nucleus $$^{246}$$Pu

Makii, Hiroyuki; Ishii, Tetsuro; Asai, Masato; Tsukada, Kazuaki; Toyoshima, Atsushi; Matsuda, Makoto; Makishima, Akiyasu*; Kaneko, Junichi*; Tome, Hayato; Ichikawa, Shinichi; et al.

no journal, , 

no abstracts in English

Oral presentation

In-beam $$gamma$$-ray spectroscopy of $$^{248,250,252}$$Cf using neutron-transfer reactions

Takahashi, 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

Oral presentation

Monochromatic neutron diffractometers for protein crystallography at present and in the future in Japan

Kurihara, Kazuo*; Kono, Fumiaki*; Shimizu, Rumi*; Tamura, Itaru; Ohara, Takashi; Chatake, Toshiyuki*; Inoue, Rintaro*; Hirano, Yu*; Tamada, Taro*

no journal, , 

Oral presentation

In-beam $$gamma$$-ray spectroscopy of more neutron-rich nuclei than the $$beta$$-stability line in the U region; $$^{236}$$Th, $$^{240,242}$$U, $$^{246}$$Pu, $$^{250}$$Cm

Ishii, Tetsuro; Makii, Hiroyuki; Asai, Masato; Koura, Hiroyuki; Shigematsu, Soichiro*; Tsukada, Kazuaki; Toyoshima, Atsushi; Matsuda, Makoto; Makishima, Akiyasu*; Shizuma, Toshiyuki; et al.

no journal, , 

The ground-state bands of $$^{236}$$Th,$$^{240,242}$$U, $$^{246}$$Pu and $$^{250}$$Cm were established by measuring deexcitation $$gamma$$ rays. These nuclei were produced by the ($$^{18}$$O, $$^{16}$$O) and ($$^{18}$$O, $$^{20}$$Ne) two-nucleon transfer reactions with $$^{238}$$U, $$^{244}$$Pu and $$^{248}$$Cm targets. The $$gamma$$ rays in residual nuclei were identified by taking coincidence with scattering particles using high-resolution Si $$Delta E$$-$$E$$ detectors. By extending the systematics of the 2$$_{1}^{+}$$ energies into neutron-rich nuclei, we have found that the $$N=152$$ deformed shell gap disappears at $$_{94}$$Pu isotopes and that U and Pu isotopes have the possibility of the spherical shell closure at $$N=164$$.

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