γ-ray spectroscopy of Λ16O and Λ15N hypernuclei via the O16(K-,π-γ) reaction

M. Ukai; S. Ajimura; H. Akikawa; D. E. Alburger; A. Banu; R. E. Chrien; G. B. Franklin; J. Franz; O. Hashimoto; T. Hayakawa; H. Hotchi; K. Imai; T. Kishimoto; M. May; D. J. Millener; S. Minami; Y. Miura; T. Miyoshi; K. Mizunuma; T. Nagae; S. N. Nakamura; K. Nakazawa; Y. Okayasu; P. Pile; B. P. Quinn; A. Rusek; Y. Sato; R. Sutter; H. Takahashi; L. Tang; H. Tamura; K. Tanida; S. H. Zhou

doi:10.1103/PhysRevC.77.054315

γ-ray spectroscopy of Λ16O and Λ15N hypernuclei via the O16(K-,π-γ) reaction

M. Ukai, S. Ajimura, H. Akikawa, D. E. Alburger, A. Banu, R. E. Chrien, G. B. Franklin, J. Franz, O. Hashimoto, T. Hayakawa, H. Hotchi, K. Imai, T. Kishimoto, M. May, D. J. Millener, S. Minami, Y. Miura, T. Miyoshi, K. Mizunuma, T. NagaeS. N. Nakamura, K. Nakazawa, Y. Okayasu, P. Pile, B. P. Quinn, A. Rusek, Y. Sato, R. Sutter, H. Takahashi, L. Tang, H. Tamura, K. Tanida, S. H. Zhou

SCI - Physics

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Abstract

The bound-state level structures of the Λ16O and Λ15N hypernuclei were studied by γ-ray spectroscopy using a germanium detector array (Hyperball) via the O16 (K-,π-γ) reaction. A level scheme for Λ16O was determined from the observation of three γ-ray transitions from the doublet of states (2-,1-) at ~6.7 MeV to the ground-state doublet (1-,0-). The Λ15N hypernuclei were produced via proton emission from unbound states in Λ16O. Three γ rays were observed, and the lifetime of the 1/2+;1 state in Λ15N was measured by the Doppler shift attenuation method. By comparing the experimental results with shell-model calculations, the spin dependence of the ΛN interaction is discussed. In particular, the measured Λ16O ground-state doublet spacing of 26.4±1.6±0.5 keV determines a small but nonzero strength of the ΛN tensor interaction.

Original language	English
Article number	054315
Journal	Physical Review C - Nuclear Physics
Volume	77
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.77.054315
Publication status	Published - 2008 May 27

ASJC Scopus subject areas

Nuclear and High Energy Physics

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10.1103/PhysRevC.77.054315

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Ukai, M., Ajimura, S., Akikawa, H., Alburger, D. E., Banu, A., Chrien, R. E., Franklin, G. B., Franz, J., Hashimoto, O., Hayakawa, T., Hotchi, H., Imai, K., Kishimoto, T., May, M., Millener, D. J., Minami, S., Miura, Y., Miyoshi, T., Mizunuma, K., ... Zhou, S. H. (2008). γ-ray spectroscopy of Λ16O and Λ15N hypernuclei via the O16(K-,π-γ) reaction. Physical Review C - Nuclear Physics, 77(5), [054315]. https://doi.org/10.1103/PhysRevC.77.054315

Ukai, M, Ajimura, S, Akikawa, H, Alburger, DE, Banu, A, Chrien, RE, Franklin, GB, Franz, J, Hashimoto, O, Hayakawa, T, Hotchi, H, Imai, K, Kishimoto, T, May, M, Millener, DJ, Minami, S, Miura, Y, Miyoshi, T, Mizunuma, K, Nagae, T, Nakamura, SN, Nakazawa, K, Okayasu, Y, Pile, P, Quinn, BP, Rusek, A, Sato, Y, Sutter, R, Takahashi, H, Tang, L, Tamura, H, Tanida, K & Zhou, SH 2008, 'γ-ray spectroscopy of Λ16O and Λ15N hypernuclei via the O16(K-,π-γ) reaction', Physical Review C - Nuclear Physics, vol. 77, no. 5, 054315. https://doi.org/10.1103/PhysRevC.77.054315

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title = "γ-ray spectroscopy of Λ16O and Λ15N hypernuclei via the O16(K-,π-γ) reaction",

abstract = "The bound-state level structures of the Λ16O and Λ15N hypernuclei were studied by γ-ray spectroscopy using a germanium detector array (Hyperball) via the O16 (K-,π-γ) reaction. A level scheme for Λ16O was determined from the observation of three γ-ray transitions from the doublet of states (2-,1-) at ~6.7 MeV to the ground-state doublet (1-,0-). The Λ15N hypernuclei were produced via proton emission from unbound states in Λ16O. Three γ rays were observed, and the lifetime of the 1/2+;1 state in Λ15N was measured by the Doppler shift attenuation method. By comparing the experimental results with shell-model calculations, the spin dependence of the ΛN interaction is discussed. In particular, the measured Λ16O ground-state doublet spacing of 26.4±1.6±0.5 keV determines a small but nonzero strength of the ΛN tensor interaction.",

author = "M. Ukai and S. Ajimura and H. Akikawa and Alburger, {D. E.} and A. Banu and Chrien, {R. E.} and Franklin, {G. B.} and J. Franz and O. Hashimoto and T. Hayakawa and H. Hotchi and K. Imai and T. Kishimoto and M. May and Millener, {D. J.} and S. Minami and Y. Miura and T. Miyoshi and K. Mizunuma and T. Nagae and Nakamura, {S. N.} and K. Nakazawa and Y. Okayasu and P. Pile and Quinn, {B. P.} and A. Rusek and Y. Sato and R. Sutter and H. Takahashi and L. Tang and H. Tamura and K. Tanida and Zhou, {S. H.}",

year = "2008",

month = may,

day = "27",

doi = "10.1103/PhysRevC.77.054315",

language = "English",

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T1 - γ-ray spectroscopy of Λ16O and Λ15N hypernuclei via the O16(K-,π-γ) reaction

AU - Ukai, M.

AU - Ajimura, S.

AU - Akikawa, H.

AU - Alburger, D. E.

AU - Banu, A.

AU - Chrien, R. E.

AU - Franklin, G. B.

AU - Franz, J.

AU - Hashimoto, O.

AU - Hayakawa, T.

AU - Hotchi, H.

AU - Imai, K.

AU - Kishimoto, T.

AU - May, M.

AU - Millener, D. J.

AU - Minami, S.

AU - Miura, Y.

AU - Miyoshi, T.

AU - Mizunuma, K.

AU - Nagae, T.

AU - Nakamura, S. N.

AU - Nakazawa, K.

AU - Okayasu, Y.

AU - Pile, P.

AU - Quinn, B. P.

AU - Rusek, A.

AU - Sato, Y.

AU - Sutter, R.

AU - Takahashi, H.

AU - Tang, L.

AU - Tamura, H.

AU - Tanida, K.

AU - Zhou, S. H.

PY - 2008/5/27

Y1 - 2008/5/27

N2 - The bound-state level structures of the Λ16O and Λ15N hypernuclei were studied by γ-ray spectroscopy using a germanium detector array (Hyperball) via the O16 (K-,π-γ) reaction. A level scheme for Λ16O was determined from the observation of three γ-ray transitions from the doublet of states (2-,1-) at ~6.7 MeV to the ground-state doublet (1-,0-). The Λ15N hypernuclei were produced via proton emission from unbound states in Λ16O. Three γ rays were observed, and the lifetime of the 1/2+;1 state in Λ15N was measured by the Doppler shift attenuation method. By comparing the experimental results with shell-model calculations, the spin dependence of the ΛN interaction is discussed. In particular, the measured Λ16O ground-state doublet spacing of 26.4±1.6±0.5 keV determines a small but nonzero strength of the ΛN tensor interaction.

AB - The bound-state level structures of the Λ16O and Λ15N hypernuclei were studied by γ-ray spectroscopy using a germanium detector array (Hyperball) via the O16 (K-,π-γ) reaction. A level scheme for Λ16O was determined from the observation of three γ-ray transitions from the doublet of states (2-,1-) at ~6.7 MeV to the ground-state doublet (1-,0-). The Λ15N hypernuclei were produced via proton emission from unbound states in Λ16O. Three γ rays were observed, and the lifetime of the 1/2+;1 state in Λ15N was measured by the Doppler shift attenuation method. By comparing the experimental results with shell-model calculations, the spin dependence of the ΛN interaction is discussed. In particular, the measured Λ16O ground-state doublet spacing of 26.4±1.6±0.5 keV determines a small but nonzero strength of the ΛN tensor interaction.

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DO - 10.1103/PhysRevC.77.054315

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VL - 77

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 5

M1 - 054315

ER -

γ-ray spectroscopy of Λ16O and Λ15N hypernuclei via the O16(K-,π-γ) reaction

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