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  • Cederwall, BoKTH,Kärnfysik (author)

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

  • Article/chapterEnglish2011

Publisher, publication year, extent ...

  • 2010-12-22
  • Springer Science and Business Media LLC,2011
  • printrdacarrier

Numbers

  • LIBRIS-ID:oai:DiVA.org:kth-28905
  • https://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-28905URI
  • https://doi.org/10.1038/nature09644DOI
  • https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-143660URI

Supplementary language notes

  • Language:English
  • Summary in:English

Part of subdatabase

Classification

  • Subject category:ref swepub-contenttype
  • Subject category:art swepub-publicationtype

Notes

  • QC 20110501
  • 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.

Subject headings and genre

Added entries (persons, corporate bodies, meetings, titles ...)

  • Ghazi Moradi, FarnazKTH,Kärnfysik(Swepub:kth)u1nxgoc1 (author)
  • Bäck, TorbjörnKTH,Kärnfysik(Swepub:kth)u14c88z3 (author)
  • Johnson, ArneKTH,Kärnfysik(Swepub:kth)u16zvniv (author)
  • Blomqvist, Jan-ErikKTH,Kärnfysik(Swepub:kth)u1b44bti (author)
  • Clément, E.Grand Accélérateur National d´lons Lourds, Cean Cedex, France (author)
  • de France, G.Grand Accélérateur National d´lons Lourds, Cean Cedex, France (author)
  • Wadsworth, R.Department of Physics, University of York, UK (author)
  • Andgren, KarinKTH,Kärnfysik(Swepub:kth)u1hgelfm (author)
  • Lagergren, KarinKTH,Kärnfysik(Swepub:kth)u1frhgcx (author)
  • Dijon, A.Grand Accélérateur National d´lons Lourds, Cean Cedex, France (author)
  • Jaworski, G.Heavy Ion Laboratory, Univeristy of Warsaw, Warsaw, Poland,Institute of Nuclear Research of the Hungarian Academy of Science, Debrecen, Hungary (author)
  • Liotta, RobertoKTH,Partikel- och astropartikelfysik(Swepub:kth)u11fc94s (author)
  • Qi, ChongKTH,Kärnfysik(Swepub:kth)u1orba8n (author)
  • Nyakó, B. M.Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary (author)
  • Nyberg, Johan,1955-Uppsala universitet,Institutionen för fysik och astronomi,Kärnfysik,Nuclear Structure,Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden,Université Bordeaux, Centre d'Etudes Nucléaires de Bordeaux Gradignan, Gradignan, France(Swepub:uu)johannb (author)
  • Palacz, M.Heavy Ion Laboratory, Univeristy of Warsaw, Warsaw, Poland (author)
  • Al-Azri, H.Department of Physics, University of York, UK (author)
  • Algora, A.IFIC, CSIC, University of Valencia, Valencia, Spain,Dipartimento di Scienze Fisiche, Universitá di Napoli and Instituto Nazionale di Fisica Nucleare, Napoli, Italy,Instituto de Estructura de la Materia, Madrid, Spain,Department of Physics and Astromony, Uppsala University, Uppsala, Sweden (author)
  • de Angelis, G.Instituto Nazionael di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro, Italy (author)
  • Atac Nyberg, AyseKTH,Kärnfysik(Swepub:kth)u1vggxbc (author)
  • Bhattacharyya, S.Grand Accélérateur National d´lons Lourds, Cean Cedex, France,Department of Physics, University of York, York, UK (author)
  • Brock, T.Department of Physics, University of York, York, UK (author)
  • Brown, J. R.Department of Physics, University of York, York, UK,Department of Physics, University of Jyväskylä, Jyväskylä, Finland (author)
  • Davies, P.Department of Physics, University of York, York, UK (author)
  • Di Nitto, A.Dipartimento di Scienze Fisiche, Universitá di Napoli and Instituto Nazionale di Fisica Nucleare, Napoli, Italy (author)
  • Dombrádi, Zs.Institute of Nuclear Research of the Hungarian Academy of Science, Debrecen, Hungary (author)
  • Gadea, A.IFIC, CSIC, University of Valencia, Valencia, Spain (author)
  • Gál, J.Institute of Nuclear Research of the Hungarian Academy of Science, Debrecen, Hungary (author)
  • Hadinia, BaharakKTH,Fysik(Swepub:kth)u1ebw4lh (author)
  • Johnston-Theasby, F.Department of Physics, University of York, York, UK (author)
  • Joshi, P.Department of Physics, University of York, York, UK (author)
  • Juhász, K.Department of Information Technology, Universty of Debrecen, Debrecen, Hungary,Heavy Ion Laboratory, Universty of Warsaw, Warsaw, Poland (author)
  • Julin, R.Department of Physics, University of Jyväskylä, Jyväskylä, Finland (author)
  • Jungclaus, A.Instituto de Estructura de la Materia, Madrid, Spain (author)
  • Kalinka, G.Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary (author)
  • Kara, S. O.Department of Physics, Ankara University, Tandogan Ankarar, Turkey (author)
  • Khaplanov, AntonKTH,Kärnfysik(Swepub:kth)u1yimljy (author)
  • Kownacki, J.Heavy Ion Laboratory, Universty of Warsaw, Warsaw, Poland (author)
  • La Rana, G.Dipartimento di Scienze Fisiche, Universitá di Napoli and Instituto Nazionale di Fisica Nucleare, Napoli, Italy (author)
  • Sandzelius, MikaelKTH,Fysik(Swepub:kth)u1vvmmuw (author)
  • Molnár, J.Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary,Department of Physics, University of York, York, UK (author)
  • Moro, R.Dipartimento di Scienze Fisiche, Universitá di Napoli and Instituto Nazionale di Fisica Nucleare, Napoli, Italy (author)
  • Napoli, D. R.Instituto Nazionale di Fisica Nucleare, Laboratori Natzionali di Legnaro, Legnaro, Italy (author)
  • Nara Singh, B. S.Department of Physics, University of York, York, UK (author)
  • Persson, AndreasKTH,Kärnfysik(Swepub:kth)u14ogjn9 (author)
  • Recchia, F.Dipartimento di Fisica dell'Universitá di Padova and Instituto Nazionale di Fisica Nucleare, Sezione di Padova, Padova, Italy (author)
  • Sandzelius, MikaelKTH,Fysik(Swepub:kth)u1vvmmuw (author)
  • Scheurer, J. -NUniversité Bordeaux, Centre d'Etudes Nucléaires de Bordeaux Gradignan, Gradignan, France (author)
  • Sletten, G.The Niels Bohr Institute, University of Copenhagen, Copenhagen, Denmark (author)
  • Sohler, D.Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary (author)
  • Söderström, P. -AUppsala universitet,Institutionen för fysik och astronomi (author)
  • Taylor, M. J.Department of Physics, University of York, York, UK (author)
  • Timár, J.Institute of Nuclear Research of the Hungarian Academy of Sciences, Debrecen, Hungary (author)
  • Valiente-Dobón, J. J.instituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, Legnaro, Italy (author)
  • Vardaci, E.Dipartimento di Scienze Fisiche, Universitá di Napoli and Instituto Nazionale di Fisica Nucleare, Napoli, Italy (author)
  • Williams, S.TRIUMF, Vancouver, British Columbia, Canada (author)
  • KTHKärnfysik (creator_code:org_t)

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  • In:Nature: Springer Science and Business Media LLC469:7328, s. 68-710028-08361476-4687

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