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

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

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dc.contributor.author Cederwall, B.
dc.contributor.author Moradi, F. Ghazi
dc.contributor.author Bäck, T.
dc.contributor.author Johnson, A.
dc.contributor.author Blomqvist, J.
dc.contributor.author Clément, E.
dc.contributor.author de France, G.
dc.contributor.author Wadsworth, R.
dc.contributor.author Andgren, K.
dc.contributor.author Lagergren, K.
dc.contributor.author Dijon, A.
dc.contributor.author Jaworski, G.
dc.contributor.author Liotta, R.
dc.contributor.author Qi, C.
dc.contributor.author Nyakó, B. M.
dc.contributor.author Nyberg, J.
dc.contributor.author Palacz, M.
dc.contributor.author Al-Azri, H.
dc.contributor.author Algora, Alejandro
dc.contributor.author De Angelis, G.
dc.contributor.author Ataç, A.
dc.contributor.author Bhattacharyya, S.
dc.contributor.author Brock, T.
dc.contributor.author Brown, J. R.
dc.contributor.author Davies, P.J.
dc.contributor.author Di Nitto, A.
dc.contributor.author Dombradi, Z.
dc.contributor.author Gadea Raga, Andrés
dc.contributor.author Gál, J.
dc.contributor.author Hadinia, B.
dc.contributor.author Johnston-Theasby, F.
dc.contributor.author Joshi, P.
dc.contributor.author Juhász, K.
dc.contributor.author Julin, R.
dc.contributor.author Jungclaus, Andrea
dc.contributor.author Kalinka, G.
dc.contributor.author Kara, S. O.
dc.contributor.author Khaplanov, A.
dc.contributor.author Kownacki, J.
dc.contributor.author Valiente Dobón, J. J.
dc.date.accessioned 2015-11-05T12:18:17Z
dc.date.available 2015-11-05T12:18:17Z
dc.date.issued 2011
dc.identifier.uri http://hdl.handle.net/10550/48060
dc.description.abstract Shell structure and magic numbers in atomic nuclei were generally explained by pioneering work(1) 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(2-6), 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 Pd-92. Gamma rays emitted following the Ni-58(Ar-36,2n)Pd-92 fusion-evaporation reaction were identified using a combination of state-of-the-art high-resolution c-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(2-6). We suggest that this coupling scheme replaces normal superfluidity (characterized by seniority coupling(7,8)) 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.
dc.language.iso eng
dc.relation.ispartof Nature, 2011, vol. 496, num. 7328, p. 68-71
dc.rights.uri info:eu-repo/semantics/openAccess
dc.source Cederwall, B. Moradi, F. Ghazi Bäck, T. Johnson, A. Blomqvist, J. Clément, E. de France, G. Wadsworth, R. Andgren, K. Lagergren, K. Dijon, A. Jaworski, G. Liotta, R. Qi, C. Nyakó, B. M. Nyberg, J. Palacz, M. Al-Azri, H. Algora, Alejandro De Angelis, G. Ataç, A. Bhattacharyya, S. Brock, T. Brown, J. R. Davies, P.J. Di Nitto, A. Dombradi, Z. Gadea Raga, Andrés Gál, J. Hadinia, B. Johnston-Theasby, F. Joshi, P. Juhász, K. Julin, R. Jungclaus, Andrea Kalinka, G. Kara, S. O. Khaplanov, A. Kownacki, J. Valiente Dobón, J. J. 2011 Evidence for a spin-aligned neutron-proton paired phase from the level structure of (92)Pd Nature 496 7328 68 71
dc.subject Física nuclear
dc.title Evidence for a spin-aligned neutron-proton paired phase from the level structure of (92)Pd
dc.type info:eu-repo/semantics/article
dc.date.updated 2015-11-05T12:18:19Z
dc.identifier.doi http://dx.doi.org/10.1038/nature09644
dc.identifier.idgrec 071051

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