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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.citation	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.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.subject	Física nuclear
dc.title	Evidence for a spin-aligned neutron-proton paired phase from the level structure of (92)Pd
dc.type	journal article	es_ES
dc.date.updated	2015-11-05T12:18:19Z
dc.identifier.doi	10.1038/nature09644
dc.identifier.idgrec	071051
dc.rights.accessRights	open access	es_ES