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Your search keyword '"Takeshita E"' showing total 44 results
Start Over Author "Takeshita E" Publisher elsevier b.v.
44 results on '"Takeshita E"'

36. Shape transition observed in neutron-rich pf-shell isotopes studied via proton inelastic scattering

Author

Aoi, N., Suzuki, H., Takeshita, E., Takeuchi, S., Ota, S., Baba, H., Bishop, S., Fukui, T., Hashimoto, Y., Ong, H.J., Ideguchi, E., Ieki, K., Imai, N., Iwasaki, H., Kanno, S., Kondo, Y., Kubo, T., Kurita, K., Kusaka, K., and Minemura, T.

Subjects
*NEUTRONS, *INELASTIC scattering, *PROTONS, *PARTICLES (Nuclear physics)
Abstract

Abstract: The structure of the neutron rich pf-shell nuclei 58Ti36, 60Cr36 and 62Cr38 was studied by proton inelastic scattering in inverse kinematics. Large quadrupole deformation lengths of 1.12(16) fm and 1.36(14) fm were obtained for 60Cr and 62Cr, respectively, which confirm the enhanced collectivity in these nuclei. An excited state was observed in 62Cr at 1180(10) keV with tentative assignment of . The increase in the ratio indicates that the nature of collectivity changes from vibrational to rotational in 62Cr and affords evidence for the development of static deformation. The excitation energy of the newly observed 2+ state in 58Ti (1046(17) keV) shows hindered collectivity. The contrast between the structures of Cr and Ti suggests that the contributions of both protons and neutrons are crucial for the large collectivity in Cr close to . From the comparison to shell model calculations, the large collectivity is found to originate from the admixture of the pf- and gd-shells across the sub-shell gap. [Copyright &y& Elsevier]

Published
2008
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37. METABOLIC MYOPATHIES II: P.348Identification of late-onset Pompe disease with nationwide high-risk screening study in Japan.

Author

Ogata, K., Kosuga, M., Takeshita, E., Matsumura, T., Ishigaki, K., Ozasa, S., Arahata, H., Sugie, K., Takahashi, T., Kuru, S., Kobayashi, M., Takada, H., Hattori, A., Takahashi, M., Tanaka, N., Kimura, T., Funato, M., Okuyama, T., and Komaki, H.

Subjects
*GENETIC disorders, *CHARCOT-Marie-Tooth disease, *GLYCOGEN storage disease type II
Published
2018
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38. Search for low lying dipole strength in the neutron rich nucleus 26Ne

Author

Gibelin, J., Beaumel, D., Motobayashi, T., Aoi, N., Baba, H., Blumenfeld, Y., Elekes, Z., Fortier, S., Frascaria, N., Fukuda, N., Gomi, T., Ishikawa, K., Kondo, Y., Kubo, T., Lima, V., Nakamura, T., Saito, A., Satou, Y., Takeshita, E., and Takeuchi, S.

Subjects
*PARTICLES (Nuclear physics), *NUCLEAR reactions, *SCATTERING (Physics), *ANGULAR correlations (Nuclear physics)
Abstract

Coulomb excitation of the exotic neutron-rich nucleus 26Ne on a nat Pb target was measured at 58 A.MeV in order to search for low-lying E1 strength above the neutron emission threshold. Data were also taken on an nat Al target to estimate the nuclear contribution. The radioactive beam was produced by fragmentation of a 95 A.MeV 40Ar beam delivered by the RIKEN Research Facility. The set-up included a NaI gamma-ray array, a charged fragment hodoscope and a neutron wall. Using the invariant mass method in the 25Ne+n channel, we observe a sizable amount of E1 strength between 6 and 10 MeV. The reconstructed 26Ne angular distribution confirms its E1 nature. A reduced dipole transition probability of e2fm2 is deduced. For the first time, the decay pattern of low-lying strength in a neutron-rich nucleus is obtained. The results are discussed in terms of a pygmy resonance centered around 9 MeV. [Copyright &y& Elsevier]

Published
2007
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39. Proton Shell Structure in Neutron-rich 23F

Author

Michimasa, S., Shimoura, S., Iwasaki, H., Tamaki, M., Ota, S., Aoi, N., Baba, H., Iwasa, N., Kanno, S., Kubono, S., Kurita, K., Kurokawa, M., Minemura, T., Motobayashi, T., Notani, M., Ong, H.J., Saito, A., Sakurai, H., Takeshita, E., and Takeuchi, S.

Subjects
*PARTICLES (Nuclear physics), *CHARGE transfer, *NUCLEAR reactions, *ANGULAR correlations (Nuclear physics)
Abstract

The proton shell structure in neutron-rich fluorine 23F was investigated using the in-beam γ-ray spectroscopy technique via the proton transfer reaction onto the 22O nucleus. We also measured the α inelastic scattering on 23F, the neutron knockout from 24F, and the two-nucleon knockout from 25Ne using a cocktail secondary beam. The excited states were identified by de-excitation γ-rays coincident with outgoing 23F, and we found the proton single-particle states at 2268 and 4059 keV by comparison of the population strengths among these reactions. These states were respectively assigned to have and by the angular distributions obtained in the transfer reaction, and therefore they were considered to have the configurations of and . The excitation energies of these states are located at higher excitation energies than the shell model predictions for the USD and SDPF-M interactions, which may indicate that the centroid energy gaps between and are wider than predictions. [Copyright &y& Elsevier]

Published
2007
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40. Proton single-particle states in the neutron-rich 23F nucleus

Author

Michimasa, S., Shimoura, S., Iwasaki, H., Tamaki, M., Ota, S., Aoi, N., Baba, H., Iwasa, N., Kanno, S., Kubono, S., Kurita, K., Kurokawa, M., Minemura, T., Motobayashi, T., Notani, M., Ong, H.J., Saito, A., Sakurai, H., Takeshita, E., and Takeuchi, S.

Subjects
*NUCLEAR reactions, *SPECTRUM analysis, *CHARGE transfer, *SCATTERING (Physics)
Abstract

Abstract: The proton shell structure in neutron-rich fluorine 23F was investigated using the in-beam γ-ray spectroscopy technique via the proton transfer reaction onto the 22O nucleus. We also measured the α inelastic scattering on 23F, the neutron knockout from 24F, and the two-nucleon knockout from 25Ne using a cocktail secondary beam. By comparison of the population strengths for excited states in these reactions, we deduced the character of the excited states. The levels and γ-decay scheme in 23F were proposed based on de-excitation γ-rays and the products of these reactions. We found that the 2268- and 4059-keV levels have strong proton single-particle nature of the and orbitals, respectively, by analysis of the population strengths and the angular distributions of the states. These single-particle states are located at higher excitation energies than the shell model predictions for the USD and SDPF-M interactions, which indicates that the centroid energy gaps for and are wider than predicted. [Copyright &y& Elsevier]

Published
2006
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41. Search for an isomeric state in 19C.

Author

Kanungo, R., Elekes, Z., Baba, H., Dombrádi, Zs., Fülöp, Zs., Gibelin, J., Horváth, Á., Ichikawa, Y., Ideguchi, E., Iwasa, N., Iwasaki, H., Kawai, S., Kondo, Y., Motobayashi, T., Notani, M., Ohnishi, T., Ozawa, A., Sakurai, H., Shimoura, S., and Takeshita, E.

Subjects
*PARTICLES (Nuclear physics), *NUCLEAR isomers, *NUCLEAR physics
Abstract

A search for an isomeric state in the neutron-rich nucleus 19C is reported. The existence of an isomer in the nucleus is predicted by shell model calculations which also predicts the ground-state of the nucleus to be 1/2+. An isomeric transition is however not observed in the present investigation. An estimation of upper limit of isomer ratio in the beam is discussed. Furthermore, the non-observation of an isomer includes the possibility of 19C having a different ground state spin. The 17C and 17B nuclei were also investigated for delayed gamma transitions but do not exhibit any isomeric transition. [Copyright &y& Elsevier]

Published
2005
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42. Excited states in neutron rich boron isotopes

Author

Kanungo, R., Elekes, Z., Baba, H., Dombrádi, Zs., Fülöp, Zs., Gibelin, J., Horváth, Á., Ichikawa, Y., Ideguchi, E., Iwasa, N., Iwasaki, H., Kawai, S., Kondo, Y., Motobayashi, T., Notani, M., Ohnishi, T., Ozawa, A., Sakurai, H., Shimoura, S., and Takeshita, E.

Subjects
*SPECTRUM analysis, *PARTICLES (Nuclear physics), *ISOTOPES, *BORON
Abstract

Abstract: New experimental results on in-beam gamma spectroscopy of neutron rich boron isotopes are presented for 17B and its neutron removal fragments 14,15B, after scattering with a H2 target. A gamma transition for 17B is observed at . The fragment 15B is observed abundantly associated with a gamma transition of . This suggests for the first time a core-excited structure for 17B thereby providing a new insight into its structure. Observations for 12,14B are also presented. The data set provides a useful systematic study of first excited states of neutron rich boron isotopes showing the dramatic drop in excitation energy beyond . [Copyright &y& Elsevier]

Published
2005
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