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.

WOS: 000301813500009 ; A study of the dimensions and performance of a single detector of the future neutron detector array NEDA was performed by means of Monte Carlo simulations, using GEANT4. Two different liquid scintillators were evaluated: the hydrogen based BC501A and the deuterated BC537. The efficiency and the probability that one neutron will trigger a signal in more than one detector were investigated as a function of the detector size. The simulations were validated comparing the results to experimental measurements performed with two existing neutron detectors, with different geometries, based on the liquid scintillator BC501. (C) 2012 Elsevier B.V. All rights reserved. ; Polish Ministry of Science and Higher Education [N N202 073935]; Swedish Research Council; European Union [212692]; LEA COPIGAL; COPIN-IN2P3; Warsaw University of Technology; MICINN, Spain [AIC10-D-000568]; INFN, Italy [AIC10-D-000568]; MICINN; Generalitat Valenciana, Spain [FPA2008-06419, PROMETEO/2010/101] ; This work was partly supported by the Polish Ministry of Science and Higher Education, grant no. N N202 073935, by the Swedish Research Council, by the European Union within the Spiral2 Preparatory Phase project (7t Framework Programme, project no. 212692), by the LEA COPIGAL and COPIN-IN2P3 collaborations, and within the framework of the European Social Fund through the Warsaw University of Technology Development Programme, realised by the Center for Advanced Studies. A. Gadea and E. Farnea acknowledge the support of MICINN, Spain, and INFN, Italy, through the AIC10-D-000568 bilateral action. A. Gadea and T. Huyuk have been partially supported by the MICINN and Generalitat Valenciana, Spain, under grants FPA2008-06419 and PROMETEO/2010/101. We acknowledge help of colleagues from the National Centre for Nuclear Research at Swierk, Poland, in particular of L. Swiderski, and thank them for providing one of the detectors and electronics. Valuable discussions with J.L. Tain, D. Cano-Ott and A. Algora are also acknowledged.

WOS: 000350998600002 ; The level structure of the neutron-rich Cu-69, Cu-71, and Cu-73 isotopes has been investigated by means of multinucleon transfer reactions. The experiment was performed at Laboratori Nazionali di Legnaro using the AGATA Demonstrator array coupled to the PRISMA magnetic spectrometer. Lifetimes of excited states in Cu nuclei were measured with the recoil-distance Doppler-shift method. The resulting electromagnetic matrix elements for transitions from excited states in Cu-69,Cu-71,Cu-73 nuclei are used to assess the collective or single-particle character of these states. The results are compared with predictions of large-scale shell-model calculations, giving further insight into the evolution of the proton pf shell as neutrons fill the 1g(9/2) orbital. ; European Union Seventh Framework Program FP7 [262010]; ENSAR; MINECO, Spain [FPA2011-29854-C03, FPA2011-29854-C04, Consolider-Ingenio 2010 CSD2007-00042]; Generalitat Valenciana, Spain [PROMETEOII/2014/019] ; This work has been partially supported by the European Union Seventh Framework Program FP7/2007-2013 under Grant Agreement No. 262010, ENSAR and MINECO, Spain, under Grants No. FPA2011-29854-C03 and No. FPA2011-29854-C04, Generalitat Valenciana, Spain, under Grant No. PROMETEOII/2014/019, and MINECO, Spain, under Grant Consolider-Ingenio 2010 CSD2007-00042.