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In-beam gamma-ray spectroscopy of the neutron-rich platinum isotope Pt-200 toward the N=126 shell gap
Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy.;Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy.;Tech Univ Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany..
Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy..
Univ Padua, Dipartimento Fis & Astron, I-35131 Padua, Italy.;Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy..
Ist Nazl Fis Nucl, Lab Nazl Legnaro, I-35020 Legnaro, Italy.;Univ Oslo, Dept Phys, POB 1048 Blindern, N-0316 Oslo, Norway..
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2017 (English)In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 95, no 6, 064321Article in journal (Refereed) Published
Abstract [en]

The neutron-rich nucleus Pt-200 is investigated via in-beam gamma-ray spectroscopy to study the shape evolution in the neutron-rich platinum isotopes towards the N = 126 shell closure. The two-neutron transfer reaction Pt-198(Se-82, Se-80)Pt-200 is used to populate excited states of Pt-200. The Advanced Gamma Ray Tracking Array (AGATA) demonstrator coupled with the PRISMA spectrometer detects gamma rays coincident with the Se-80 recoils, the binary partner of Pt-200. The binary partner method is applied to extract the gamma-ray transitions and build the level scheme of Pt-200. The level at 1884 keV reported by Yates et al. [S. W. Yates, E. M. Baum, E. A. Henry, L. G. Mann, N. Roy, A. Aprahamian, R. A. Meyer, and R. Estep, Phys. Rev. C 37, 1889 (1988)] was confirmed to be at 1882.1 keV and assigned as the (6(1)(+)) state. An additional gamma ray was found and it presumably deexcites the (8(1)(+)) state. The results are compared with state-of-the-art beyond mean-field calculations, performed for the even-even Pt190-204 isotopes, revealing that Pt-200 marks the transition from the gamma-unstable behavior of lighter Pt nuclei towards a more spherical one when approaching the N = 126 shell closure.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2017. Vol. 95, no 6, 064321
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-329652DOI: 10.1103/PhysRevC.95.064321ISI: 000404021900005OAI: oai:DiVA.org:uu-329652DiVA: diva2:1143422
Funder
EU, FP7, Seventh Framework Programme, 262010
Available from: 2017-09-21 Created: 2017-09-21 Last updated: 2017-11-29Bibliographically approved

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