Structure of neutron-rich nuclei around the N = 126 closed shell; the yrast structure of 205Au126 up to spin-parity IΠ = (19/2+)

Zs Podolyák, S. J. Steer, S. Pietri, M. Górska, P. H. Regan, D. Rudolph, A. B. Garnsworthy, R. Hoischen, J. Gerl, H. J. Wollersheim, H. Grawe, K. H. Maier, F. Becker, P. Bednarczyk, L. Cáceres, P. Doornenbal, H. Geissel, J. Grebosz, A. Kelic, I. KojouharovN. Kurz, F. Montes, W. Prokopowicz, T. Saito, H. Schaffner, S. Tashenov, A. Heinz, T. Kurtukian-Nieto, G. Benzoni, M. Pfützner, A. Jungclaus, D. L. Balabanski, C. Brandau, B. A. Brown, A. M. Bruce, W. N. Catford, I. J. Cullen, Zs Dombrádi, M. E. Estevez, W. Gelletly, G. Ilie, J. Jolie, G. A. Jones, M. Kmiecik, F. G. Kondev, R. Krücken, S. Lalkovski, Z. Liu, A. Maj, S. Myalski, S. Schwertel, T. Shizuma, P. M. Walker, E. Werner-Malento, O. Wieland

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Abstract

Heavy neutron-rich nuclei have been populated through the relativistic fragmentation of a 82208Pb beam at E/A = 1 GeV on a 2.5 g/cm2 thick Be target. The synthesised nuclei were selected and identified in-flight using the fragment separator at GSI. Approximately 300 ns after production, the selected nuclei were implanted in an ~ 8 mm thick perspex stopper, positioned at the centre of the RISING γ-ray detector spectrometer array. A previously unreported isomer with a half-life T1/2 = 163(5) ns has been observed in the N = 126 closed-shell nucleus 79205 Au. Through γ-ray singles and γ-γ coincidence analysis a level scheme was established. The comparison with a shell model calculation tentatively identifies the spin-parity of the excited states, including the isomer itself, which is found to be IΠ.

Original languageEnglish
Pages (from-to)489-493
Number of pages5
JournalEuropean Physical Journal A
Volume42
Issue number3
DOIs
Publication statusPublished - Dec 1 2009

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ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Podolyák, Z., Steer, S. J., Pietri, S., Górska, M., Regan, P. H., Rudolph, D., Garnsworthy, A. B., Hoischen, R., Gerl, J., Wollersheim, H. J., Grawe, H., Maier, K. H., Becker, F., Bednarczyk, P., Cáceres, L., Doornenbal, P., Geissel, H., Grebosz, J., Kelic, A., ... Wieland, O. (2009). Structure of neutron-rich nuclei around the N = 126 closed shell; the yrast structure of 205Au126 up to spin-parity IΠ = (19/2+). European Physical Journal A, 42(3), 489-493. https://doi.org/10.1140/epja/i2009-10794-5