Ground-state bands of neutron-rich Th236 and U242 nuclei and implication of spherical shell closure at N=164

T. Ishii; H. Makii; M. Asai; H. Koura; S. Shigematsu; K. Tsukada; A. Toyoshima; M. Matsuda; A. Makishima; J. Kaneko; H. Toume; I. Hossain; T. Shizuma; S. Ichikawa; T. Kohno; M. Ogawa

doi:10.1103/PhysRevC.76.011303

Ground-state bands of neutron-rich Th236 and U242 nuclei and implication of spherical shell closure at N=164

T. Ishii, H. Makii, M. Asai, H. Koura, S. Shigematsu, K. Tsukada, A. Toyoshima, M. Matsuda, A. Makishima, J. Kaneko, H. Toume, I. Hossain, T. Shizuma, S. Ichikawa, T. Kohno, M. Ogawa

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Abstract

The ground-state bands of the neutron-rich Th236 and U242 nuclei were established up to spin 10 and 8, respectively, by in-beam γ-ray spectroscopy using the (O18, Ne20) two-proton pickup reaction with a U238 and a Pu244 target. Deexcitation γ rays in Th236 and U242 were identified by selecting the kinetic energies of Ne20 using Si ΔE-E detectors. The excitation energies of the first 2+ states in U and Pu isotopes have local minima at N 146, suggesting the possibility that nuclei with Z 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 U256.

Original language	English
Article number	011303
Journal	Physical Review C - Nuclear Physics
Volume	76
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevC.76.011303
Publication status	Published - Jul 10 2007
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1103/PhysRevC.76.011303

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Ishii, T., Makii, H., Asai, M., Koura, H., Shigematsu, S., Tsukada, K., Toyoshima, A., Matsuda, M., Makishima, A., Kaneko, J., Toume, H., Hossain, I., Shizuma, T., Ichikawa, S., Kohno, T., & Ogawa, M. (2007). Ground-state bands of neutron-rich Th236 and U242 nuclei and implication of spherical shell closure at N=164. Physical Review C - Nuclear Physics, 76(1), Article 011303. https://doi.org/10.1103/PhysRevC.76.011303

Ishii, T, Makii, H, Asai, M, Koura, H, Shigematsu, S, Tsukada, K, Toyoshima, A, Matsuda, M, Makishima, A, Kaneko, J, Toume, H, Hossain, I, Shizuma, T, Ichikawa, S, Kohno, T & Ogawa, M 2007, 'Ground-state bands of neutron-rich Th236 and U242 nuclei and implication of spherical shell closure at N=164', Physical Review C - Nuclear Physics, vol. 76, no. 1, 011303. https://doi.org/10.1103/PhysRevC.76.011303

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title = "Ground-state bands of neutron-rich Th236 and U242 nuclei and implication of spherical shell closure at N=164",

abstract = "The ground-state bands of the neutron-rich Th236 and U242 nuclei were established up to spin 10 and 8, respectively, by in-beam γ-ray spectroscopy using the (O18, Ne20) two-proton pickup reaction with a U238 and a Pu244 target. Deexcitation γ rays in Th236 and U242 were identified by selecting the kinetic energies of Ne20 using Si ΔE-E detectors. The excitation energies of the first 2+ states in U and Pu isotopes have local minima at N 146, suggesting the possibility that nuclei with Z 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 U256.",

author = "T. Ishii and H. Makii and M. Asai and H. Koura and S. Shigematsu and K. Tsukada and A. Toyoshima and M. Matsuda and A. Makishima and J. Kaneko and H. Toume and I. Hossain and T. Shizuma and S. Ichikawa and T. Kohno and M. Ogawa",

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doi = "10.1103/PhysRevC.76.011303",

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T1 - Ground-state bands of neutron-rich Th236 and U242 nuclei and implication of spherical shell closure at N=164

AU - Ishii, T.

AU - Makii, H.

AU - Asai, M.

AU - Koura, H.

AU - Shigematsu, S.

AU - Tsukada, K.

AU - Toyoshima, A.

AU - Matsuda, M.

AU - Makishima, A.

AU - Kaneko, J.

AU - Toume, H.

AU - Hossain, I.

AU - Shizuma, T.

AU - Ichikawa, S.

AU - Kohno, T.

AU - Ogawa, M.

PY - 2007/7/10

Y1 - 2007/7/10

N2 - The ground-state bands of the neutron-rich Th236 and U242 nuclei were established up to spin 10 and 8, respectively, by in-beam γ-ray spectroscopy using the (O18, Ne20) two-proton pickup reaction with a U238 and a Pu244 target. Deexcitation γ rays in Th236 and U242 were identified by selecting the kinetic energies of Ne20 using Si ΔE-E detectors. The excitation energies of the first 2+ states in U and Pu isotopes have local minima at N 146, suggesting the possibility that nuclei with Z 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 U256.

AB - The ground-state bands of the neutron-rich Th236 and U242 nuclei were established up to spin 10 and 8, respectively, by in-beam γ-ray spectroscopy using the (O18, Ne20) two-proton pickup reaction with a U238 and a Pu244 target. Deexcitation γ rays in Th236 and U242 were identified by selecting the kinetic energies of Ne20 using Si ΔE-E detectors. The excitation energies of the first 2+ states in U and Pu isotopes have local minima at N 146, suggesting the possibility that nuclei with Z 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 U256.

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JF - Physical Review C - Nuclear Physics

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ER -

Ground-state bands of neutron-rich Th236 and U242 nuclei and implication of spherical shell closure at N=164

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