Study of shape transition in the neutron-rich Os isotopes

P.R. John; V. Modamio; J.J. Valiente-Dobón; D. Mengoni; A. Gottardo; D. Bazzacco; S. Lunardi; T. Alexander; G. de Angelis; N. Ashwood; M. Barr; P.G. Bizzeti; A.M. Bizzeti-Sona; S. Bottoni; M. Bowry; A. Bracco; F. Browne; M. Bunce; A. Gadea; F. Camera; L. Corradi; F.C.L. Crespi; E. Farnea; E. Fioretto; Tz. Kokalova; W. Korten; A. Kuşoğlu; S. Lenzi; S. Leoni; C. Michelagnoli; T. Mijatović; G. Montagnoli; D. Montanari; D.R. Napoli; Zs. Podolyák; G. Pollarolo; F. Recchia; O.J. Roberts; E. Şahin; M.-D. Salsac; F. Scarlassara; A.M. Stefanini; S. Szilner; C.A. Ur; J. Walshe; C. Wheldon

doi:10.1051/epjconf/20146602057

All issues

Volume 66 (2014)

EPJ Web of Conferences, 66 (2014) 02057

Abstract

Open Access

Issue		EPJ Web of Conferences Volume 66, 2014 INPC 2013 – International Nuclear Physics Conference


Article Number		02057
Number of page(s)		4
Section		Nuclear Structure
DOI		https://doi.org/10.1051/epjconf/20146602057
Published online		20 March 2014

EPJ Web of Conferences 66, 02057 (2014)
https://doi.org/10.1051/epjconf/20146602057

Study of shape transition in the neutron-rich Os isotopes

P.R. John¹^,2^a, V. Modamio³, J.J. Valiente-Dobón³, D. Mengoni¹^,2, A. Gottardo³, D. Bazzacco², S. Lunardi¹^,2, T. Alexander⁴, G. de Angelis³, N. Ashwood⁵, M. Barr⁵, P.G. Bizzeti⁶^,7, A.M. Bizzeti-Sona⁶^,7, S. Bottoni⁸^,9, M. Bowry⁴, A. Bracco⁸^,9, F. Browne¹⁰, M. Bunce⁴, A. Gadea¹¹, F. Camera⁸^,9, L. Corradi³, F.C.L. Crespi⁸^,9, E. Farnea², E. Fioretto³, Tz. Kokalova⁵, W. Korten¹², A. Kuşoğlu¹³, S. Lenzi¹^,2, S. Leoni⁸^,9, C. Michelagnoli¹^,2, T. Mijatović¹⁴, G. Montagnoli¹^,2, D. Montanari¹^,2, D.R. Napoli³, Zs. Podolyák¹⁰, G. Pollarolo¹⁵^,16, F. Recchia¹^,2, O.J. Roberts¹⁰, E. Şahin³, M.-D. Salsac¹², F. Scarlassara¹^,2, A.M. Stefanini³, S. Szilner¹⁴, C.A. Ur², J. Walshe⁵ and C. Wheldon⁵

¹ Dipartimento di Fisica e Astronomia, Università degli Studi di Padova, Padova, Italy
² INFN Sezione di Padova, Padova, Italy
³ INFN Laboratori Nazionali di Legnaro, Legnaro, Italy
⁴ Department of Physics, University of Surrey, Guildford, United Kingdom
⁵ School of Physics and Astronomy, University of Birmingham, Birmingham, United Kingdom
⁶ Dipartimento di Fisica, Università degli Studi di Firenze, Firenze, Italy
⁷ INFN Sezione di Firenze, Firenze, Italy
⁸ Dipartimento di Fisica, Università degli Studi di Milano, Milano, Italy
⁹ INFN Sezione di Milano, Milano, Italy
¹⁰ University of Brighton, Brighton, United Kingdom
¹¹ Instituto de Física Corpuscular, CSIC, Valencia, Spain
¹² CEA/Saclay, IRFU/Service de Physique Nucleaire, Gif-sur-Yvette, France
¹³ İstanbul Üniversitesi, İstanbul, Turkey
¹⁴ Institut Ruđer Bošković, Zagreb, Croatia
¹⁵ Dipartimento di Fisica, Università degli Studi di Torino, Torino, Italy
¹⁶ INFN Sezione di Torino, Torino, Italy

^a e-mail: philipp.john@pd.infn.it

Published online: 20 March 2014

Abstract

The neutron-rich isotopes of tungsten, osmium and platinum have different shapes in their ground states and present also shape transitions phenomena. Spectroscopic information for these nuclei is scarce and often limited to the gamma rays from the decay of isomeric states. For the neutron-rich even-even osmium isotopes ¹⁹⁴Os and ¹⁹⁸Os, a shape transition between a slightly prolate deformed to an oblate deformed ground state was deduced from the observed level schemes. For the even-even nucleus lying in between, ¹⁹⁶Os, no gamma ray transition is known. In order to elucidate the shape transition and to test the nuclear models describing it, this region was investigated through gamma-ray spectroscopy using the AGATA demonstrator and the large acceptance heavy-ion spectrometer PRISMA at LNL, Italy. A two-nucleon transfer from a ¹⁹⁸Pt target to a stable ⁸²Se beam was utilized to populate medium-high spin states of ¹⁹⁶Os. The analysis method and preliminary results, including the first life-time measurement of isomeric states with AGATA, are presented.

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