Two-hole structure outside Ni 78: Existence of a μ s isomer of Co 76 and β decay into Ni 76

P. A. Söderström; S. Nishimura; Z. Y. Xu; K. Sieja; V. Werner; P. Doornenbal; G. Lorusso; F. Browne; G. Gey; H. S. Jung; T. Sumikama; J. Taprogge; Zs Vajta; H. Watanabe; J. Wu; H. Baba; Zs Dombradi; S. Franchoo; T. Isobe; P. R. John; Y. K. Kim; I. Kojouharov; N. Kurz; Y. K. Kwon; Z. Li; I. Matea; K. Matsui; G. Martínez-Pinedo; D. Mengoni; P. Morfouace; D. R. Napoli; M. Niikura; H. Nishibata; A. Odahara; K. Ogawa; N. Pietralla; E. Şahin; H. Sakurai; H. Schaffner; D. Sohler; I. G. Stefan; D. Suzuki; R. Taniuchi; A. Yagi; K. Yoshinaga

doi:10.1103/PhysRevC.92.051305

Two-hole structure outside Ni 78: Existence of a μ s isomer of Co 76 and β decay into Ni 76

P. A. Söderström, S. Nishimura, Z. Y. Xu, K. Sieja, V. Werner, P. Doornenbal, G. Lorusso, F. Browne, G. Gey, H. S. Jung, T. Sumikama, J. Taprogge, Zs Vajta, H. Watanabe, J. Wu, H. Baba, Zs Dombradi, S. Franchoo, T. Isobe, P. R. JohnY. K. Kim, I. Kojouharov, N. Kurz, Y. K. Kwon, Z. Li, I. Matea, K. Matsui, G. Martínez-Pinedo, D. Mengoni, P. Morfouace, D. R. Napoli, M. Niikura, H. Nishibata, A. Odahara, K. Ogawa, N. Pietralla, E. Şahin, H. Sakurai, H. Schaffner, D. Sohler, I. G. Stefan, D. Suzuki, R. Taniuchi, A. Yagi, K. Yoshinaga

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Abstract

In the EURICA campaign aimed at exploration of the Ni78 region, an isomeric state of Co76 has been observed via γ-ray spectroscopy. The nuclei were produced by in-flight fission of a U238 beam at the Radioactive Isotope-Beam Factory. Two coincident γ rays of 192.02(30) and 446.4(7) keV from the decay of a t1/2=2.96(2529)μs isomeric state of Co76 have been observed. The decay of the isomer was assigned to an E1 transition with a reduced transition probability of B(E1;3+→2-)=1.79(16)×10-8 W.u. A β-decaying state with spin-parity 1- and a half-life of 16(4) ms was also observed in the data, and the known state with a half-life of 22(57) ms was assigned to have a spin-parity of 8-. Furthermore, the isomer of Ni76 has been remeasured to 547.8(33) ns giving a B(E2;8+→6+) value of 0.786(5) W.u. A new excited state at 2994.6(5) keV, decaying via a γ ray of 2004.5(4) keV, has also been observed. This is in agreement with either of the predicted 02+ or 22+ states. These results are discussed in terms of the shell model and the interaction of the νp1/2 and πf7/2 orbitals.

Original language	English
Article number	051305
Journal	Physical Review C - Nuclear Physics
Volume	92
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevC.92.051305
Publication status	Published - Nov 23 2015
Externally published	Yes

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics

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10.1103/PhysRevC.92.051305

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Söderström, P. A., Nishimura, S., Xu, Z. Y., Sieja, K., Werner, V., Doornenbal, P., Lorusso, G., Browne, F., Gey, G., Jung, H. S., Sumikama, T., Taprogge, J., Vajta, Z., Watanabe, H., Wu, J., Baba, H., Dombradi, Z., Franchoo, S., Isobe, T., ... Yoshinaga, K. (2015). Two-hole structure outside Ni 78: Existence of a μ s isomer of Co 76 and β decay into Ni 76. Physical Review C - Nuclear Physics, 92(5), [051305]. https://doi.org/10.1103/PhysRevC.92.051305

Söderström, PA, Nishimura, S, Xu, ZY, Sieja, K, Werner, V, Doornenbal, P, Lorusso, G, Browne, F, Gey, G, Jung, HS, Sumikama, T, Taprogge, J, Vajta, Z, Watanabe, H, Wu, J, Baba, H, Dombradi, Z, Franchoo, S, Isobe, T, John, PR, Kim, YK, Kojouharov, I, Kurz, N, Kwon, YK, Li, Z, Matea, I, Matsui, K, Martínez-Pinedo, G, Mengoni, D, Morfouace, P, Napoli, DR, Niikura, M, Nishibata, H, Odahara, A, Ogawa, K, Pietralla, N, Şahin, E, Sakurai, H, Schaffner, H, Sohler, D, Stefan, IG, Suzuki, D, Taniuchi, R, Yagi, A & Yoshinaga, K 2015, 'Two-hole structure outside Ni 78: Existence of a μ s isomer of Co 76 and β decay into Ni 76', Physical Review C - Nuclear Physics, vol. 92, no. 5, 051305. https://doi.org/10.1103/PhysRevC.92.051305

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title = "Two-hole structure outside Ni 78: Existence of a μ s isomer of Co 76 and β decay into Ni 76",

abstract = "In the EURICA campaign aimed at exploration of the Ni78 region, an isomeric state of Co76 has been observed via γ-ray spectroscopy. The nuclei were produced by in-flight fission of a U238 beam at the Radioactive Isotope-Beam Factory. Two coincident γ rays of 192.02(30) and 446.4(7) keV from the decay of a t1/2=2.96(2529)μs isomeric state of Co76 have been observed. The decay of the isomer was assigned to an E1 transition with a reduced transition probability of B(E1;3+→2-)=1.79(16)×10-8 W.u. A β-decaying state with spin-parity 1- and a half-life of 16(4) ms was also observed in the data, and the known state with a half-life of 22(57) ms was assigned to have a spin-parity of 8-. Furthermore, the isomer of Ni76 has been remeasured to 547.8(33) ns giving a B(E2;8+→6+) value of 0.786(5) W.u. A new excited state at 2994.6(5) keV, decaying via a γ ray of 2004.5(4) keV, has also been observed. This is in agreement with either of the predicted 02+ or 22+ states. These results are discussed in terms of the shell model and the interaction of the νp1/2 and πf7/2 orbitals.",

author = "S{\"o}derstr{\"o}m, {P. A.} and S. Nishimura and Xu, {Z. Y.} and K. Sieja and V. Werner and P. Doornenbal and G. Lorusso and F. Browne and G. Gey and Jung, {H. S.} and T. Sumikama and J. Taprogge and Zs Vajta and H. Watanabe and J. Wu and H. Baba and Zs Dombradi and S. Franchoo and T. Isobe and John, {P. R.} and Kim, {Y. K.} and I. Kojouharov and N. Kurz and Kwon, {Y. K.} and Z. Li and I. Matea and K. Matsui and G. Mart{\'i}nez-Pinedo and D. Mengoni and P. Morfouace and Napoli, {D. R.} and M. Niikura and H. Nishibata and A. Odahara and K. Ogawa and N. Pietralla and E. {\c S}ahin and H. Sakurai and H. Schaffner and D. Sohler and Stefan, {I. G.} and D. Suzuki and R. Taniuchi and A. Yagi and K. Yoshinaga",

note = "Publisher Copyright: {\textcopyright} 2015 American Physical Society.",

year = "2015",

month = nov,

day = "23",

doi = "10.1103/PhysRevC.92.051305",

language = "English",

volume = "92",

journal = "Physical Review C - Nuclear Physics",

issn = "0556-2813",

publisher = "American Physical Society",

number = "5",

}

TY - JOUR

T1 - Two-hole structure outside Ni 78

T2 - Existence of a μ s isomer of Co 76 and β decay into Ni 76

AU - Söderström, P. A.

AU - Nishimura, S.

AU - Xu, Z. Y.

AU - Sieja, K.

AU - Werner, V.

AU - Doornenbal, P.

AU - Lorusso, G.

AU - Browne, F.

AU - Gey, G.

AU - Jung, H. S.

AU - Sumikama, T.

AU - Taprogge, J.

AU - Vajta, Zs

AU - Watanabe, H.

AU - Wu, J.

AU - Baba, H.

AU - Dombradi, Zs

AU - Franchoo, S.

AU - Isobe, T.

AU - John, P. R.

AU - Kim, Y. K.

AU - Kojouharov, I.

AU - Kurz, N.

AU - Kwon, Y. K.

AU - Li, Z.

AU - Matea, I.

AU - Matsui, K.

AU - Martínez-Pinedo, G.

AU - Mengoni, D.

AU - Morfouace, P.

AU - Napoli, D. R.

AU - Niikura, M.

AU - Nishibata, H.

AU - Odahara, A.

AU - Ogawa, K.

AU - Pietralla, N.

AU - Şahin, E.

AU - Sakurai, H.

AU - Schaffner, H.

AU - Sohler, D.

AU - Stefan, I. G.

AU - Suzuki, D.

AU - Taniuchi, R.

AU - Yagi, A.

AU - Yoshinaga, K.

PY - 2015/11/23

Y1 - 2015/11/23

N2 - In the EURICA campaign aimed at exploration of the Ni78 region, an isomeric state of Co76 has been observed via γ-ray spectroscopy. The nuclei were produced by in-flight fission of a U238 beam at the Radioactive Isotope-Beam Factory. Two coincident γ rays of 192.02(30) and 446.4(7) keV from the decay of a t1/2=2.96(2529)μs isomeric state of Co76 have been observed. The decay of the isomer was assigned to an E1 transition with a reduced transition probability of B(E1;3+→2-)=1.79(16)×10-8 W.u. A β-decaying state with spin-parity 1- and a half-life of 16(4) ms was also observed in the data, and the known state with a half-life of 22(57) ms was assigned to have a spin-parity of 8-. Furthermore, the isomer of Ni76 has been remeasured to 547.8(33) ns giving a B(E2;8+→6+) value of 0.786(5) W.u. A new excited state at 2994.6(5) keV, decaying via a γ ray of 2004.5(4) keV, has also been observed. This is in agreement with either of the predicted 02+ or 22+ states. These results are discussed in terms of the shell model and the interaction of the νp1/2 and πf7/2 orbitals.

AB - In the EURICA campaign aimed at exploration of the Ni78 region, an isomeric state of Co76 has been observed via γ-ray spectroscopy. The nuclei were produced by in-flight fission of a U238 beam at the Radioactive Isotope-Beam Factory. Two coincident γ rays of 192.02(30) and 446.4(7) keV from the decay of a t1/2=2.96(2529)μs isomeric state of Co76 have been observed. The decay of the isomer was assigned to an E1 transition with a reduced transition probability of B(E1;3+→2-)=1.79(16)×10-8 W.u. A β-decaying state with spin-parity 1- and a half-life of 16(4) ms was also observed in the data, and the known state with a half-life of 22(57) ms was assigned to have a spin-parity of 8-. Furthermore, the isomer of Ni76 has been remeasured to 547.8(33) ns giving a B(E2;8+→6+) value of 0.786(5) W.u. A new excited state at 2994.6(5) keV, decaying via a γ ray of 2004.5(4) keV, has also been observed. This is in agreement with either of the predicted 02+ or 22+ states. These results are discussed in terms of the shell model and the interaction of the νp1/2 and πf7/2 orbitals.

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U2 - 10.1103/PhysRevC.92.051305

DO - 10.1103/PhysRevC.92.051305

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VL - 92

JO - Physical Review C - Nuclear Physics

JF - Physical Review C - Nuclear Physics

IS - 5

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ER -

Two-hole structure outside Ni 78: Existence of a μ s isomer of Co 76 and β decay into Ni 76

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