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

Research output: Contribution to journalArticle

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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 languageEnglish
Article number051305
JournalPhysical Review C - Nuclear Physics
Volume92
Issue number5
DOIs
Publication statusPublished - Nov 23 2015
Externally publishedYes

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rays
isomers
half life
parity
decay
industrial plants
radioactive isotopes
transition probabilities
fission
flight
orbitals
nuclei
spectroscopy
excitation
interactions

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

Cite this

Söderström, P. A., Nishimura, S., Xu, Z. Y., Sieja, K., Werner, V., Doornenbal, P., ... 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

Two-hole structure outside Ni 78 : Existence of a μ s isomer of Co 76 and β decay into Ni 76. / 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, Zs; Watanabe, H.; Wu, J.; Baba, H.; Dombradi, Zs; Franchoo, S.; Isobe, T.; John, P. R.; Kim, Y. K.; Kojouharov, I.; Kurz, N.; Kwon, Y. K.; Li, Z.; Matea, I.; Matsui, K.; Martínez-Pinedo, G.; Mengoni, D.; Morfouace, P.; Napoli, D. R.; Niikura, M.; Nishibata, H.; Odahara, A.; Ogawa, K.; Pietralla, N.; Şahin, E.; Sakurai, H.; Schaffner, H.; Sohler, D.; Stefan, I. G.; Suzuki, D.; Taniuchi, R.; Yagi, A.; Yoshinaga, K.

In: Physical Review C - Nuclear Physics, Vol. 92, No. 5, 051305, 23.11.2015.

Research output: Contribution to journalArticle

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
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, Zs ; Watanabe, H. ; Wu, J. ; Baba, H. ; Dombradi, Zs ; Franchoo, S. ; Isobe, T. ; John, P. R. ; Kim, Y. K. ; Kojouharov, I. ; Kurz, N. ; Kwon, Y. K. ; Li, Z. ; Matea, I. ; Matsui, K. ; Martínez-Pinedo, G. ; Mengoni, D. ; Morfouace, P. ; Napoli, D. R. ; Niikura, M. ; Nishibata, H. ; Odahara, A. ; Ogawa, K. ; Pietralla, N. ; Şahin, E. ; Sakurai, H. ; Schaffner, H. ; Sohler, D. ; Stefan, I. G. ; Suzuki, D. ; Taniuchi, R. ; Yagi, A. ; Yoshinaga, K. / Two-hole structure outside Ni 78 : Existence of a μ s isomer of Co 76 and β decay into Ni 76. In: Physical Review C - Nuclear Physics. 2015 ; Vol. 92, No. 5.
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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. Şahin 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",
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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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