Electric monopole transition strengths in 62Ni

L. J. Evitts; A. B. Garnsworthy; T. Kibédi; M. Moukaddam; B. Alshahrani; T. K. Eriksen; J. D. Holt; S. S. Hota; G. J. Lane; B. Q. Lee; B. P. McCormick; N. Palalani; M. W. Reed; S. R. Stroberg; A. E. Stuchbery

doi:10.1051/epjconf/201612302004

Electric monopole transition strengths in ⁶²Ni

L. J. Evitts, A. B. Garnsworthy, T. Kibédi, M. Moukaddam, B. Alshahrani, T. K. Eriksen, J. D. Holt, S. S. Hota, G. J. Lane, B. Q. Lee, B. P. McCormick, N. Palalani, M. W. Reed, S. R. Stroberg, A. E. Stuchbery

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Abstract

Excited states in 62Ni were populated with a (p, p') reaction using the 14UD Pelletron accelerator at the Australian National University. Electric monopole transition strengths, ρ²(E0), were measured through simultaneous detection of the internal conversion electrons and γ rays emitted from the de-excitation of populated states, using the Super-e spectrometer coupled with a germanium detector. The strength of the 0⁺₂ to 0⁺₁ transition has been measured to be 77⁺²³_-34 × 10^-3 and agrees with previously reported values. Upper limits have been placed on the 0⁺₃ to 0⁺₁ and 0⁺₃ to 0⁺₂ transitions. The measured ρ²(E0) value of the 2⁺₂ to 2⁺₁ transition in ⁶²Ni has been measured for the first time and found to be one of the largest ρ²(E0) values measured to date in nuclei heavier than Ca. The low-lying states of ⁶²Ni have previously been classified as one-and two-phonon vibrational states based on level energies. The measured electric quadrupole transition strengths are consistent with this interpretation. However as electric monopole transitions are forbidden between states which differ by one phonon number, the simple harmonic quadrupole vibrational picture is not sufficient to explain the large ρ²(E0) value for the 2⁺₂ to 2⁺₁ transition.

Original language	English
Article number	02004
Journal	EPJ Web of Conferences
Volume	123
DOIs	https://doi.org/10.1051/epjconf/201612302004
Publication status	Published - 5 Sept 2016
Event	2015 Heavy Ion Accelerator Symposium, HIAS 2015 - Canberra, Australia Duration: 14 Sept 2015 → 18 Sept 2015

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Evitts, L. J., Garnsworthy, A. B., Kibédi, T., Moukaddam, M., Alshahrani, B., Eriksen, T. K., Holt, J. D., Hota, S. S., Lane, G. J., Lee, B. Q., McCormick, B. P., Palalani, N., Reed, M. W., Stroberg, S. R., & Stuchbery, A. E. (2016). Electric monopole transition strengths in ⁶²Ni. EPJ Web of Conferences, 123, Article 02004. https://doi.org/10.1051/epjconf/201612302004

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title = "Electric monopole transition strengths in 62Ni",

abstract = "Excited states in 62Ni were populated with a (p, p') reaction using the 14UD Pelletron accelerator at the Australian National University. Electric monopole transition strengths, ρ2(E0), were measured through simultaneous detection of the internal conversion electrons and γ rays emitted from the de-excitation of populated states, using the Super-e spectrometer coupled with a germanium detector. The strength of the 0+2 to 0+1 transition has been measured to be 77+23-34 × 10-3 and agrees with previously reported values. Upper limits have been placed on the 0+3 to 0+1 and 0+3 to 0+2 transitions. The measured ρ2(E0) value of the 2+2 to 2+1 transition in 62Ni has been measured for the first time and found to be one of the largest ρ2(E0) values measured to date in nuclei heavier than Ca. The low-lying states of 62Ni have previously been classified as one-and two-phonon vibrational states based on level energies. The measured electric quadrupole transition strengths are consistent with this interpretation. However as electric monopole transitions are forbidden between states which differ by one phonon number, the simple harmonic quadrupole vibrational picture is not sufficient to explain the large ρ2(E0) value for the 2+2 to 2+1 transition.",

author = "Evitts, {L. J.} and Garnsworthy, {A. B.} and T. Kib{\'e}di and M. Moukaddam and B. Alshahrani and Eriksen, {T. K.} and Holt, {J. D.} and Hota, {S. S.} and Lane, {G. J.} and Lee, {B. Q.} and McCormick, {B. P.} and N. Palalani and Reed, {M. W.} and Stroberg, {S. R.} and Stuchbery, {A. E.}",

note = "Publisher Copyright: {\textcopyright} The Authors, published by EDP Sciences.; 2015 Heavy Ion Accelerator Symposium, HIAS 2015 ; Conference date: 14-09-2015 Through 18-09-2015",

year = "2016",

month = sep,

day = "5",

doi = "10.1051/epjconf/201612302004",

language = "English",

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T1 - Electric monopole transition strengths in 62Ni

AU - Evitts, L. J.

AU - Garnsworthy, A. B.

AU - Kibédi, T.

AU - Moukaddam, M.

AU - Alshahrani, B.

AU - Eriksen, T. K.

AU - Holt, J. D.

AU - Hota, S. S.

AU - Lane, G. J.

AU - Lee, B. Q.

AU - McCormick, B. P.

AU - Palalani, N.

AU - Reed, M. W.

AU - Stroberg, S. R.

AU - Stuchbery, A. E.

PY - 2016/9/5

Y1 - 2016/9/5

N2 - Excited states in 62Ni were populated with a (p, p') reaction using the 14UD Pelletron accelerator at the Australian National University. Electric monopole transition strengths, ρ2(E0), were measured through simultaneous detection of the internal conversion electrons and γ rays emitted from the de-excitation of populated states, using the Super-e spectrometer coupled with a germanium detector. The strength of the 0+2 to 0+1 transition has been measured to be 77+23-34 × 10-3 and agrees with previously reported values. Upper limits have been placed on the 0+3 to 0+1 and 0+3 to 0+2 transitions. The measured ρ2(E0) value of the 2+2 to 2+1 transition in 62Ni has been measured for the first time and found to be one of the largest ρ2(E0) values measured to date in nuclei heavier than Ca. The low-lying states of 62Ni have previously been classified as one-and two-phonon vibrational states based on level energies. The measured electric quadrupole transition strengths are consistent with this interpretation. However as electric monopole transitions are forbidden between states which differ by one phonon number, the simple harmonic quadrupole vibrational picture is not sufficient to explain the large ρ2(E0) value for the 2+2 to 2+1 transition.

AB - Excited states in 62Ni were populated with a (p, p') reaction using the 14UD Pelletron accelerator at the Australian National University. Electric monopole transition strengths, ρ2(E0), were measured through simultaneous detection of the internal conversion electrons and γ rays emitted from the de-excitation of populated states, using the Super-e spectrometer coupled with a germanium detector. The strength of the 0+2 to 0+1 transition has been measured to be 77+23-34 × 10-3 and agrees with previously reported values. Upper limits have been placed on the 0+3 to 0+1 and 0+3 to 0+2 transitions. The measured ρ2(E0) value of the 2+2 to 2+1 transition in 62Ni has been measured for the first time and found to be one of the largest ρ2(E0) values measured to date in nuclei heavier than Ca. The low-lying states of 62Ni have previously been classified as one-and two-phonon vibrational states based on level energies. The measured electric quadrupole transition strengths are consistent with this interpretation. However as electric monopole transitions are forbidden between states which differ by one phonon number, the simple harmonic quadrupole vibrational picture is not sufficient to explain the large ρ2(E0) value for the 2+2 to 2+1 transition.

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JO - EPJ Web of Conferences

JF - EPJ Web of Conferences

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T2 - 2015 Heavy Ion Accelerator Symposium, HIAS 2015

Y2 - 14 September 2015 through 18 September 2015

ER -

Electric monopole transition strengths in ⁶²Ni

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