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Öğe Decay of a 19(-) isomeric state in Lu-156(Amer Physical Soc, 2018) Lewis, M. C.; Parr, E.; Page, R. D.; McPeake, C.; Joss, D. T.; Ali, F. A.; Auranen, K.; Briscoe, A. D.; Capponi, L.; Grahn, T.; Greenlees, P. T.; Henderson, J.; Herzan, A.; Jakobsson, U.; Julin, R.; Juutinen, S.; Konki, J.; Labiche, M.; Leino, M.; Mason, P. J. R.; Nyman, M.; O'Donnell, D.; Pakarinen, J.; Papadakis, P.; Partanen, J.; Peura, P.; Rahkila, P.; Revill, J. P.; Ruotsalainen, P.; Sandzelius, M.; Saren, J.; Saygi, B.; Scholey, C.; Simpson, J.; Smith, J. F.; Smolen, M.; Sorri, J.; Stolze, S.; Thornthwaite, A.; Uusitalo, J.A multiparticle spin-trap isomeric state having a half-life of 179(4) ns and lying 2601 keV above the yrast 10(+) state in Lu-156 has been discovered. The Lu-156 nuclei were produced by bombarding isotopically enriched Cd-106 targets with beams of Ni-58 ions, separated in flight using the gas-filled separator RITU and their decays were measured using the GREAT spectrometer. Analysis of the main decay path that populates yrast states observed previously suggests a spin-parity assignment of 19(-) for the isomeric state, which is consistent with isomeric states identified in the N = 85 isotones. Comparison with other decay paths in Lu-156 indicates that the [pi h(11/)(2)(-1) circle times nu h(9/2)]10(+) state at the bottom of the yrast sequence is likely to be the a-decaying isomeric state, with the [pi h(11/)(2)(-1) circle times nu f(7/2)]9(+) state lying 62 keV above it. The relative ordering of the lowest-lying 9(+) and 10(+) states is inverted in Lu-156 compared with its odd-odd isotones.Öğe High-spin states of Th-218(Iop Publishing Ltd, 2020) O'Donnell, D.; Page, R. D.; Grahn, T.; Ali, F. A.; Auranen, K.; Capponi, L.; Papadakis, P.High-spin states in theN= 128 nucleus(218)Th have been investigated following fusion-evaporation reactions, using the recoil-decay tagging technique. Due to the short-lived nature of the ground state of(218)Th prompt gamma rays have been correlated with the alpha decay of the daughter nucleus(214)Ra. the level scheme representing the decay of excited states has been extended to (16(+)) with the observation of six previously unreported transitions. the observations are compared with the results of shell model calculations and within the context of the systematics of neighbouring nuclei.Öğe Lifetime measurements in Re-166: Collective versus magnetic rotation(Amer Physical Soc, 2016) Li, H. J.; Cederwall, B.; Doncel, M.; Peng, J.; Chen, Q. B.; Zhang, S. Q.; Zhao, P. W.; Meng, J.; Back, T.; Jakobsson, U.; Auranen, K.; Boenig, S.; Drummond, M.; Grahn, T.; Greenlees, P.; Herzan, A.; Joss, D. T.; Julin, R.; Juutinen, S.; Konki, J.; Kroell, T.; Leino, M.; McPeake, C.; O'Donnell, D.; Page, R. D.; Pakarinen, J.; Partanen, J.; Peura, P.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Saren, J.; Saygi, B.; Scholey, C.; Sorri, J.; Stolze, S.; Taylor, M. J.; Thornthwaite, A.; Uusitalo, J.; Xiao, Z. G.Lifetimes of excited states in the neutron-deficient odd-odd nucleus Re-166 have been measured for the first time using the recoil distance Doppler-shift method. The measured lifetime for the (8(-)) state; tau = 480 (80) ps, enabled an assessment of the multipolarities of the gamma rays depopulating this state. Information on electromagnetic transition strengths were deduced for the gamma-ray transitions from the (9(-)), (10(-)), and (11(-)) states, and in the case of the (10(-)) and (11(-)) states limits on the B (M1) and B(E2) strengths were estimated. The results are compared with total Routhian surface predictions and semiclassical calculations. Tilted-axis cranking calculations based on a relativistic mean-field approach (TAC-RMF) have also been performed in order to test the possibility of magnetic rotation in the 166Re nucleus. While the TAC-RMF calculations predict a quadrupole-deformed nuclear shape with similar beta(2) deformation as obtained by using the TRS model, it was found that the experimental electromagnetic transition rates are in better agreement with a collective -rotational description.Öğe Lifetime measurements of excited states in W-162 and W-164 and the evolution of collectivity in rare-earth nuclei(Amer Physical Soc, 2017) Doncel, M.; Cederwall, B.; Qi, C.; Li, H.; Jakobsson, U.; Auranen, K.; Boenig, S.; Drummond, M. C.; Grahn, T.; Greenlees, P. T.; Herzan, A.; Joss, D. T.; Julin, R.; Juutinen, S.; Konki, J.; Kroell, T.; Leino, M.; McPeake, C.; O'Donnell, D.; Page, R. D.; Pakarinen, J.; Partanen, J.; Peura, P.; Rahkila, P.; Ruotsalainen, P.; Sandzelius, M.; Saren, J.; Saygi, B.; Scholey, C.; Sorri, J.; Stolze, S.; Taylor, M. J.; Thornthwaite, A.; Uusitalo, J.Lifetimes of the first excited 2(+) states in the extremely neutron- deficient W-162 and W-164 nuclei have been measured using the recoil distance Doppler shift technique. Experimental B(E2) data for the isotopic chains of hafnium, tungsten, and osmium, from the midshell region near the beta-stability line towards the N = 82 closed shell and the most neutron-deficient nuclides, are compared with predictions of nuclear deformations and 2(1)(+) -> 0(g.s)(.+) reduced transition strengths from different classes of state-of-the-art theoretical model calculations. The results reveal striking differences and deficiencies in the predictive power of current nuclear structure models.Öğe Reduced transition probabilities along the yrast line in W-166(Amer Physical Soc, 2017) Saygi, B.; Joss, D. T.; Page, R. D.; Grahn, T.; Simpson, J.; O'Donnell, D.; Alharshan, G.; Auranen, K.; Back, T.; Boening, S.; Braunroth, T.; Carroll, R. J.; Cederwall, B.; Cullen, D. M.; Dewald, A.; Doncel, M.; Donosa, L.; Drummond, M. C.; Ertugral, F.; Erturk, S.; Fransen, C.; Greenlees, P. T.; Hackstein, M.; Hauschild, K.; Herzan, A.; Jakobsson, U.; Jones, P. M.; Julin, R.; Juutinen, S.; Konki, J.; Kroell, T.; Labiche, M.; Lopez-Martens, A.; McPeake, C. G.; Moradi, F.; Moeller, O.; Mustafa, M.; Nieminen, P.; Pakarinen, J.; Partanen, J.; Peura, P.; Procter, M.; Rahkila, P.; Rother, W.; Ruotsalainen, P.; Sandzelius, M.; Saren, J.; Scholey, C.; Sorri, J.; Stolze, S.; Taylor, M. J.; Thornthwaite, A.; Uusitalo, J.Lifetimes of excited states in the yrast band of the neutron-deficient nuclide W-166 have been measured utilizing the DPUNS plunger device at the target position of the JUROGAM II gamma-ray spectrometer in conjunction with the RITU gas-filled separator and the GREAT focal-plane spectrometer. Excited states in W-166 were populated in the Mo-92(Kr-78, 4p) reaction at a bombarding energy of 380 MeV. The measurements reveal a low value for the ratio of reduced transitions probabilities for the lowest-lying transitions B(E2; 4(+)-> 2(+)) / B(E2; 2(+)-> 0(+)) = 0.33(5), compared with the expected ratio for an axially deformed rotor (B-4/2 = 1.43).
