Isospin properties of nuclear pair correlations from the level structure of theself-conjugate nucleus 88Ru
2019
The low-lying energy spectrum of the extremely neutron-deficient self-conjugate (N = Z) nuclide
88
44Ru44 has been measured using the combination of the Advanced Gamma Tracking Array
(AGATA) spectrometer, the NEDA and Neutron Wall neutron detector arrays, and the DIAMANT
charged particle detector array. Excited states in 88Ru were populated via the 54Fe(36Ar; 2n
)88Ru
fusion-evaporation reaction at the Grand Acc�el�erateur National d'Ions Lourds (GANIL) accelerator
complex. The observed
-ray cascade is assigned to 88Ru using clean prompt
-
-2-neutron
coincidences in anti-coincidence with the detection of charged particles, con�rming and extending
the previously assigned sequence of low-lying excited states. It is consistent with a moderately
deformed rotating system exhibiting a band crossing at a rotational frequency that is significantly
higher than standard theoretical predictions with isovector pairing, as well as observations in neighboring
N > Z nuclides. The direct observation of such a \delayed" rotational alignment in a
deformed N = Z nucleus is in agreement with theoretical predictions related to the presence of
strong isoscalar neutron-proton pair correlations.
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