Status of vibrational structure in $^{62}\mathrm{Ni}$

Status of vibrational structure in ${}^{62}{Ni}$

A. Chakraborty, J. N. Orce, S. F. Ashley, B. A. Brown, B. P. Crider, E. Elhami, M. T. McEllistrem, S. Mukhopadhyay, E. E. Peters, B. Singh, and S. W. Yates

Phys. Rev. C 83, 034316 – Published 16 March 2011

Abstract

Measurements consisting of $γ$ -ray excitation functions and angular distributions were performed using the ( $n, n^{'} γ$ ) reaction on ${}^{62}{Ni}$ . The excitation function data allowed us to check the consistency of the placement of transitions in the level scheme. From $γ$ -ray angular distributions, the lifetimes of levels up to $~ 3.8$ MeV in excitation energy were extracted with the Doppler-shift attenuation method. The experimentally deduced values of reduced transition probabilities were compared with the predictions of the quadrupole vibrator model and with large-scale shell model calculations in the $fp$ shell configuration space. Two-phonon states were found to exist with some notable deviation from the predictions of the quadrupole vibrator model, but no evidence for the existence of three-phonon states could be established. $Z = 28$ proton core excitations played a major role in understanding the observed structure.

Received 15 December 2010

DOI:https://doi.org/10.1103/PhysRevC.83.034316

Authors & Affiliations

A. Chakraborty^1,*, J. N. Orce^1,†, S. F. Ashley^1,‡, B. A. Brown^2,3, B. P. Crider¹, E. Elhami^1,§, M. T. McEllistrem¹, S. Mukhopadhyay^1,∥, E. E. Peters⁴, B. Singh⁵, and S. W. Yates^1,4

¹Department of Physics and Astronomy, University of Kentucky, Lexington, Kentucky 40506-0055, USA
²National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
³Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
⁴Department of Chemistry, University of Kentucky, Lexington, Kentucky 40506-0055, USA
⁵Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1

^*anagha@pa.uky.edu; on leave from the Department of Physics, Krishnath College, Berhampore 742101, India.
^†Present address: Department of Physics, University of the Western Cape, P/B X17, Bellville, ZA-7535 South Africa.
^‡Present address: Tandem Accelerator Laboratory, Institute of Nuclear Physics, NCSR “Demokritos”, 15310 Aghia Paraskevi, Athens, Greece.
^§Present address: Department of Physics, University of Winnipeg, Winnipeg, MB R3E 2B9, Canada.
^∥Present address: Radiation Monitoring Devices, Inc., Watertown, Massachusetts 02472, USA.

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Vol. 83, Iss. 3 — March 2011

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Physical Review C

covering nuclear physics

Status of vibrational structure in ${}^{62}{Ni}$

A. Chakraborty, J. N. Orce, S. F. Ashley, B. A. Brown, B. P. Crider, E. Elhami, M. T. McEllistrem, S. Mukhopadhyay, E. E. Peters, B. Singh, and S. W. Yates

Phys. Rev. C 83, 034316 – Published 16 March 2011

Abstract

Authors & Affiliations

Article Text (Subscription Required)

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Physical Review C

covering nuclear physics

Status of vibrational structure in Ni62

A. Chakraborty, J. N. Orce, S. F. Ashley, B. A. Brown, B. P. Crider, E. Elhami, M. T. McEllistrem, S. Mukhopadhyay, E. E. Peters, B. Singh, and S. W. Yates

Phys. Rev. C 83, 034316 – Published 16 March 2011

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Status of vibrational structure in ${}^{62}{Ni}$