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Status of vibrational structure in Ni62
Authors
,
SF Ashley
+10 more
BA Brown
A Chakraborty
BP Crider
E Elhami
MT McEllistrem
S Mukhopadhyay
JN Orce
EE Peters
B Singh
SW Yates
Publication date
1 January 2011
Publisher
Doi
Cite
Abstract
Measurements consisting of γ-ray excitation functions and angular distributions were performed using the (n,n′γ) reaction on Ni62. 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. © 2011 American Physical Society
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