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

dc.contributor.authorCEDERWALL, B.
dc.contributor.authorGHAZI MORADI, F.
dc.contributor.authorBACK, T.
dc.contributor.authorJOHNSON, A.
dc.contributor.authorBLOMQVIST, J.
hal.structure.identifierGrand Accélérateur National d'Ions Lourds [GANIL]
dc.contributor.authorCLÉMENT, E.
hal.structure.identifierGrand Accélérateur National d'Ions Lourds [GANIL]
dc.contributor.authorDE FRANCE, G.
dc.contributor.authorANDGREN, K.
dc.contributor.authorLAGERGREN, K.
hal.structure.identifierGrand Accélérateur National d'Ions Lourds [GANIL]
dc.contributor.authorDIJON, A.
dc.contributor.authorJAWORSKI, G.
dc.contributor.authorLIOTTA, R.
dc.contributor.authorQI, C.
dc.contributor.authorM. NYAKO, B.
dc.contributor.authorNYBERG, J.
dc.contributor.authorPALACZ, M.
dc.contributor.authorAL-AZRI, H.
dc.contributor.authorALGORA, A.
dc.contributor.authorDE ANGELIS, G.
dc.contributor.authorATAÇ, A.
hal.structure.identifierGrand Accélérateur National d'Ions Lourds [GANIL]
dc.contributor.authorBHATTACHARYYA, S.
dc.contributor.authorBROCK, T.
dc.contributor.authorR. BROWN, J.
dc.contributor.authorDAVIES, P.
dc.contributor.authorDI NITTO, A.
dc.contributor.authorDOMBRADI, Zs.
dc.contributor.authorGADEA, A.
dc.contributor.authorGAL, J.
dc.contributor.authorHADINIA, B.
dc.contributor.authorJOHNSTON-THEASBY, F.
dc.contributor.authorJOSHI, P.
dc.contributor.authorJUHASZ, K.
dc.contributor.authorJULIN, R.
dc.contributor.authorJUNGCLAUS, A.
dc.contributor.authorKALINKA, G.
dc.contributor.authorO. KARA, S.
dc.contributor.authorKHAPLANOV, A.
dc.contributor.authorKOWNACKI, J.
dc.contributor.authorLA RANA, G.
dc.contributor.authorM. LENZI, S.
dc.contributor.authorMOLNAR, J.
dc.contributor.authorMORO, R.
dc.contributor.authorR. NAPOLI, D.
dc.contributor.authorS. NARA SINGH, B.
dc.contributor.authorPERSSON, A.
dc.contributor.authorRECCHIA, F.
dc.contributor.authorSANDZELIUS, M.
hal.structure.identifierExcitations Nucléaires par Laser [ENL]
dc.contributor.authorSCHEURER, J.-N.
dc.contributor.authorSLETTEN, G.
dc.contributor.authorSOHLER, D.
dc.contributor.authorSODERSTROM, P.-A.
dc.contributor.authorJ. TAYLOR, M.
dc.contributor.authorTIMAR, J.
dc.contributor.authorVALIENTE-DOBON, J.J.
dc.contributor.authorVARDACI, E.
dc.contributor.authorWILLIAMS, S.
dc.date.issued2011
dc.identifier.issn0028-0836
dc.description.abstractEnShell 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 $^{2,3,4,5,6}$, 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 $^{92}$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 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 $^{2,3,4,5,6}$. 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.isoen
dc.publisherNature Publishing Group
dc.title.enEvidence for a spin-aligned neutron-proton paired phase from the level structure of 92Pd
dc.typeArticle de revue
dc.identifier.doi10.1038/nature09644
dc.subject.halPhysique [physics]/Physique Nucléaire Expérimentale [nucl-ex]
dc.subject.halPhysique [physics]/Physique Nucléaire Théorique [nucl-th]
dc.identifier.arxiv1101.2187
bordeaux.journalNature
bordeaux.page68-71
bordeaux.volume469
bordeaux.peerReviewedoui
hal.identifierin2p3-00551948
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//in2p3-00551948v1
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