K. Juhász

Publications (5)40.23 Total impact

• Source

  Available from: Jie Meng

  Article: The first candidate for chiral nuclei in the $A\sim80$ mass region: $^{80}$Br

  S Y Wang, B. Qi, L Liu, S Q Zhang, H. Hua, X Q Li, Y. Y. Chen, L H Zhu, J Meng, S. M. Wyngaardt, [......], S. N. T. Majola, P. L. Masiteng, S. M. Mullins, J Gál, G. Kalinka, J Molnár, B M Nyakó, J. Timár, K. Juhász, R. Schwengner
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  ABSTRACT: Excited states of $^{80}$Br have been investigated via the $^{76}$Ge($^{11}$B, $\alpha$3n) and $^{76}$Ge($^{7}$Li, 3n) reactions and a new $\Delta I$ = 1 band has been identified which resides $\sim$ 400 keV above the yrast band. Based on the experimental results and their comparison with the triaxial particle rotor model calculated ones, a chiral character of the two bands within the $\pi g_{9/2}\otimes \nu g_{9/2}$ configuration is proposed, which provides the first evidence for chirality in the $A\sim80$ region.
  Physics Letters B 09/2011; 703(1):40-45. · 3.95 Impact Factor
• Source

  Available from: Pär-Anders Söderström

  Article: Evidence for a spin-aligned neutron-proton paired phase from the level structure of (92)Pd.

  B Cederwall, F Ghazi Moradi, T Bäck, A Johnson, J Blomqvist, E Clément, G de France, R Wadsworth, K Andgren, K Lagergren, [......], M Sandzelius, J-N Scheurer, G Sletten, D Sohler, P-A Söderström, M J Taylor, J Timár, J J Valiente-Dobón, E Vardaci, S Williams
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  ABSTRACT: Shell structure and magic numbers in atomic nuclei were generally explained by pioneering work that introduced a strong spin-orbit interaction to the nuclear shell model potential. However, knowledge of nuclear forces and the mechanisms governing the structure of nuclei, in particular far from stability, is still incomplete. In nuclei with equal neutron and proton numbers (N = Z), enhanced correlations arise between neutrons and protons (two distinct types of fermions) that occupy orbitals with the same quantum numbers. Such correlations have been predicted to favour an unusual type of nuclear superfluidity, termed isoscalar neutron-proton pairing, in addition to normal isovector pairing. Despite many experimental efforts, these predictions have not been confirmed. Here we report the experimental observation of excited states in the N = Z = 46 nucleus (92)Pd. Gamma rays emitted following the (58)Ni((36)Ar,2n)(92)Pd fusion-evaporation reaction were identified using a combination of state-of-the-art high-resolution γ-ray, charged-particle and neutron detector systems. Our results reveal evidence for a spin-aligned, isoscalar neutron-proton coupling scheme, different from the previous prediction. We suggest that this coupling scheme replaces normal superfluidity (characterized by seniority coupling) in the ground and low-lying excited states of the heaviest N = Z nuclei. Such strong, isoscalar neutron-proton correlations would have a considerable impact on the nuclear level structure and possibly influence the dynamics of rapid proton capture in stellar nucleosynthesis.
  Nature 01/2011; 469(7328):68-71. · 36.28 Impact Factor
• Article: Electric dipole moments in 230,232U and implications for tetrahedral shapes

  S. S. Ntshangase, R. A. Bark, D. G. Aschman, S. Bvumbi, P. Datta, P. M. Davidson, T. S. Dinoko, M. E. A. Elbasher, K. Juhász, E. M. A. Khaleel, [......], S. M. Mullins, P. Nieminen, B. M. Nyakó, P. Papka, D. G. Roux, J. F. Sharpey-Shafer, O. Shirinda, M. A. Stankiewicz, J. Timár, A. N. Wilson
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  ABSTRACT: The nuclei 230U and 232U were populated in the compound nucleus reactions 232Th(α,6n) and 232Th(α,4n), respectively. Gamma rays from these nuclei were observed in coincidence with a recoil detector. A comprehensive set of in-band E2 transitions were observed in the lowest lying negative-parity band of 232U while one E2 transition was also observed for 230U. These allowed B(E1;I-→I+-1)/B(E2;I-→I--2) ratios to be extracted and compared with systematics. The values are similar to those of their Th and Ra isotones. The possibility of a tetrahedral shape for the negative-parity U bands appears difficult to reconcile with the measured Q2 values for the isotone 226Ra.
  Phys. Rev. C. 10/2010; 82(4-041305(R) (2010)).
• Article: Probing the maximally deformed light rare-earth region around the drip-line nucleus 130 Sm

  M Petri, E S Paul, P J Nolan, A J Boston, R J Cooper, M R Dimmock, S Gros, B M McGuirk, H C Scraggs, G Turk, [......], L Zolnai, K Juhász, V F E Pucknell, RWadsworth, P Joshi, G La Rana, R Moro, M Trotta, E Vardaci, G Hackm
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  ABSTRACT: The neutron deficient rare-earth nuclei of the A ~130 region are of particular interest since highly
  Physica Scripta. 01/2006; 2006:214.
• Article: Deformation of the very neutron‐deficient rare‐earth nuclei produced with the SPIRAL 76Kr radioactive beam and studied with EXOGAM + DIAMANT

  N. Redon, A. Prévost, D. Guinet, Ph. Lautesse, M. Meyer, B. Rossé, O. Stézowski, P. J. Nolan, C. Andreoiu, A. J. Boston, [......], D. Appelbe, D. Joss, R. Lemmon, J. Smith, D. Cullen, A. Brondi, G. La Rana, R. Moro, E. Vardacci, M. Girod
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  ABSTRACT: The structure of the very neutron‐deficient rare‐earth nuclei has been investigated in the first experiment with the EXOGAM gamma array coupled to the DIAMANT light charged particle detector using radioactive beam of 76Kr delivered by the SPIRAL facility. Very neutron‐deficient Pr, Nd and Pm isotopes have been populated at rather high spin by the reaction 76Kr + 58Ni at a beam energy of 328 MeV. We report here the first results of this experiment. © 2004 American Institute of Physics
  AIP Conference Proceedings. 02/2004; 701(1):208-212.