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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：14 Percentile：64.03(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：67.51(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：34 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：11 Percentile：60.78(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：68.83(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：19 Percentile：67.80(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：20 Percentile：75.69(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.

Journal Articles

Nanosecond isomers in neutron-rich N$$approx$$19 nuclei

Asai, Masato; Ishii, Tetsuro; Makishima, Akiyasu*; Ogawa, Masao*; Matsuda, Makoto

Fission and Properties of Neutron-Rich Nuclei; Proceedings of 3rd International Conference, p.295 - 297, 2003/10

Nanosecond isomers in neutron-rich N$$sim$$20 nuclei produced in the heavy-ion deep-inelastic collision have been searched for. Spin-parities of the isomers in $$^{32,33}$$Si and $$^{34}$$P have been identified through $$gamma$$-ray angular distribution and lifetime measurements. It has been found that these isomers arise from the neutron excitation on the $$f_{7/2}$$ orbitals.

Journal Articles

Gamma-ray spectroscopy of the neutron-rich Ni region through heavy-ion deep-inelastic collisions

Ishii, Tetsuro; Asai, Masato; Makishima, Akiyasu*; Hossain, I.*; Kleinheinz, P.*; Ogawa, Masao*; Matsuda, Makoto; Ichikawa, Shinichi

European Physical Journal A, 13(1-2), p.15 - 19, 2002/01

https://doi.org/10.1140/epja1339-04

no abstracts in English

Journal Articles

Nano-second isomers in neutron-rich Ni region produced by deep-inelastic collisions

Ishii, Tetsuro; Asai, Masato; Matsuda, Makoto; Ichikawa, Shinichi; Makishima, Akiyasu*; Hossain, I.*; Kleinheinz, P.*; Ogawa, Masao*

Acta Physica Polonica B, 32(3), p.739 - 746, 2001/03

http://www.actaphys.uj.edu.pl/_cur/store/vol32/pdf/v32p0739.pdf

no abstracts in English

Journal Articles

Nanosecond isomers in neutro-rich $$^{67}$$Cu and $$^{64}$$Co and a fast ${it E3}$ transition in $$^{67}$$Cu

Asai, Masato; Ishii, Tetsuro; Makishima, Akiyasu*; Hossain, I.*; Ogawa, Masao*; Ichikawa, Shinichi

Physical Review C, 62(5), p.054313_1 - 054313_7, 2000/11

https://doi.org/10.1103/PhysRevC.62.054313
 Times Cited Count：19 Percentile：68.72(Physics, Nuclear)

no abstracts in English

Journal Articles

Core-excited states in the doubly magic $$^{68}$$Ni and its neighbor $$^{69}$$Cu

Ishii, Tetsuro; Asai, Masato*; Makishima, Akiyasu*; Hossain, I.*; Ogawa, Masao*; Hasegawa, Jun*; Matsuda, Makoto*; Ichikawa, Shinichi

AIP Conference Proceedings 495, p.67 - 70, 1999/12

https://doi.org/10.1063/1.1301740

no abstracts in English

Journal Articles

The ($$nu$$g$$_{9/22}$$$$pi$$p$$_{3/2}$$)$$_{19/2}$$- isomer in $$^{71}$$Cu and the prediction of its $$E2$$ decay from the shell model

Ishii, Tetsuro; Asai, Masato*; Hossain, I.*; P.Kleinheinz*; Ogawa, Masao*; Makishima, Akiyasu*; Ichikawa, Shinichi; ; ; J.Blomqvist*

Physical Review Letters, 81(19), p.4100 - 4103, 1998/11

https://doi.org/10.1103/PhysRevLett.81.4100
 Times Cited Count：43 Percentile：82.84(Physics, Multidisciplinary)

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：42 Percentile：92.54(Instruments & Instrumentation)

no abstracts in English

Journal Articles

Magnetic properties of $$^{105-108}$$Sn:Experiments and calculations

; Ishii, Tetsuro; Makishima, Akiyasu*; Ogawa, Masao*; ;

5th Int. Spring Seminar on Nuclear Physics,New Perspectives in Nuclear Structure, 0, p.159 - 168, 1995/00

no abstracts in English

Journal Articles

Nuclear isomerism in $$^{100}$$Sn neighbors

; Ishii, Tetsuro; Makishima, Akiyasu*; Ogawa, Masao*; ;

Phys. Scr., T56, p.89 - 93, 1995/00

https://doi.org/10.1088/0031-8949/1995/T56/014
 Times Cited Count：9 Percentile：55.51(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Subnanosecond isomers in $$^{105,107}$$Sn

Ogawa, Masao*; ; Makishima, Akiyasu*; Ishii, Tetsuro; ; ;

Phys. Scr., T56, p.289 - 291, 1995/00

https://doi.org/10.1088/0031-8949/1995/T56/051
 Times Cited Count：2 Percentile：25.85(Physics, Multidisciplinary)

no abstracts in English

Journal Articles

Subnanosecond isomers in $$^{105,107}$$Sn

Ogawa, Masao*; ; Makishima, Akiyasu*; Ishii, Tetsuro; ; ;

Phys. Scr., T56(0), p.289 - 291, 1995/00

no abstracts in English

Journal Articles

Nuclear structure of$$^{109}$$Sb

Ishii, Tetsuro; Makishima, Akiyasu*; Shibata, Michihiro; Ogawa, Masao*;

Physical Review C, 49(6), p.2982 - 2989, 1994/06

https://doi.org/10.1103/PhysRevC.49.2982
 Times Cited Count：12 Percentile：61.47(Physics, Nuclear)

no abstracts in English

33 (Records 1-20 displayed on this page)