Suchergebnisse

WOS:000513242500002 ; The low-lying energy spectrum of the extremely neutron-deficient self-conjugate (N = Z) nuclide Ru-88(44)44 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 Ru-88 were populated via the Fe-54(Ar-36, 2n gamma)Ru-88* fusion-evaporation reaction at the Grand Accelerateur National d'Ions Lourds (GANIL) accelerator complex. The observed gamma-ray cascade is assigned to Ru-88 using clean prompt gamma-gamma-2-neutron coincidences in anticoincidence with the detection of charged particles, confirming 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. ; Swedish Research CouncilSwedish Research Council [621-2014-5558]; EU 7th Framework Programme, Integrating Activities Transnational AccessEuropean Union (EU) [262010 ENSAR]; United Kingdom STFCScience & Technology Facilities Council (STFC) [ST/L005727/1, ST/P003885/1]; Polish National Science Centre [2017/25/B/ST2/01569, 2016/22/M/ST2/00269, 2014/14/M/ST2/00738]; COPIN-INFN collaboration; COPIN-IN2P3; COPIGAL projects; National Research Development and Innovation Fund of Hungary [K128947]; European Regional Development FundEuropean Union (EU) [GINOP-2.3.3-15-2016-00034]; Hungarian National Research, Development and Innovation Office [PD124717]; Ministry of Science, Spain [SEV-2014-0398, FPA2017-84756-C4]; EU FEDER fundsEuropean Union (EU); China Scholarship CouncilChina Scholarship Council [201700260183] ; This work was supported by the Swedish Research Council under Grant No. 621-2014-5558 and the EU 7th Framework Programme, Integrating Activities Transnational Access, Grant No. 262010 ENSAR; the United Kingdom STFC under Grants No. ST/L005727/1 and No. ST/P003885/1; the Polish National Science Centre, Grants No. 2017/25/B/ST2/01569, No. 2016/22/M/ST2/00269, No. 2014/14/M/ST2/00738 (COPIN-INFN collaboration; COPIN-IN2P3 and COPIGAL projects; the National Research Development and Innovation Fund of Hungary (Grant No. K128947); the European Regional Development Fund (Contract No. GINOP-2.3.3-15-2016-00034), by the Hungarian National Research, Development and Innovation Office, Grant No. PD124717; the Ministry of Science, Spain, under Grants No. SEV-2014-0398 and FPA2017-84756-C4; and by the EU FEDER funds. X. L. gratefully acknowledges support from the China Scholarship Council, Grant No. 201700260183 for his stay in Sweden. We thank the GANIL staff for excellent technical support and operation.