M1 and E2 transition rates from core-excited states in semi-magic 94Ru

A. Ertoprak; B. Cederwall; C. Qi; M. Doncel; U. Jakobsson; B. M. Nyakó; G. Jaworski; P. Davies; G. de France; I. Kuti; D. R. Napoli; R. Wadsworth; S. S. Ghugre; R. Raut; B. Akkus; H. Al Azri; A. Algora; G. de Angelis; A. Atac; T. Bäck; A. Boso; E. Clément; D. M. Debenham; Zs. Dombrádi; S. Ertürk; A. Gadea; F. Ghazi Moradi; A. Gottardo; T. Hüyük; E. Ideguchi; H. Li; C. Michelagnoli; V. Modamio; J. Nyberg; M. Palacz; C. M. Petrache; F. Recchia; M. Sandzelius; M. Siciliano; J. Timár; J. J. Valiente-Dobón; Z. G. Xiao

doi:10.1140/epja/i2018-12581-7

2023 Impact factor 2.6

Hadrons and Nuclei

Eur. Phys. J. A (2018) 54: 145
https://doi.org/10.1140/epja/i2018-12581-7

Regular Article - Experimental Physics

M1 and E2 transition rates from core-excited states in semi-magic ⁹⁴Ru

A. Ertoprak¹^,2^*, B. Cederwall¹, C. Qi¹, M. Doncel¹^,3, U. Jakobsson¹^,4, B. M. Nyakó⁵, G. Jaworski⁶, P. Davies⁷, G. de France⁸, I. Kuti⁵, D. R. Napoli⁶, R. Wadsworth⁷, S. S. Ghugre⁹, R. Raut⁹, B. Akkus², H. Al Azri⁷, A. Algora⁵^,10, G. de Angelis⁶, A. Atac¹, T. Bäck¹, A. Boso¹¹, E. Clément⁸, D. M. Debenham⁷, Zs. Dombrádi⁵, S. Ertürk¹², A. Gadea¹⁰, F. Ghazi Moradi¹, A. Gottardo¹³, T. Hüyük¹⁰, E. Ideguchi¹⁴, H. Li¹, C. Michelagnoli⁸, V. Modamio⁶, J. Nyberg¹⁵, M. Palacz¹⁶, C. M. Petrache¹³, F. Recchia¹¹, M. Sandzelius¹⁷, M. Siciliano⁶, J. Timár⁵, J. J. Valiente-Dobón⁶ and Z. G. Xiao¹⁸

¹ Department of Physics, Royal Institute of Technology (KTH), SE-10691, Stockholm, Sweden
² Department of Physics, Faculty of Science, Istanbul University, Vezneciler/Fatih, 34134, Istanbul, Turkey
³ Department of Physics, Oliver Lodge Laboratory, University of Liverpool, L69 7ZE, Liverpool, UK
⁴ Department of Chemistry, University of Helsinki, P.O. Box 3, 00014, Helsinki, Finland
⁵ MTA Atomki, H-4001, Debrecen, Hungary
⁶ Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di Legnaro, I-35020, Legnaro, Italy
⁷ Department of Physics, University of York, YO10 5DD, Heslington, York, UK
⁸ Grand Accélérateur National d’Ions Lourds (GANIL), CEA/DSM - CNRS/IN2P3, Bd Henri Becquerel, BP 55027, F-14076, Caen Cedex 5, France
⁹ UGC-DAE Consortium for Scientific Research, Kolkata Centre, 700098, Kolkata, India
¹⁰ Instituto de Física Corpuscular, CSIC-Universidad de Valencia, E-46980, Valencia, Spain
¹¹ Dipartimento di Fisica e Astronomia, Università di Padova, Padova, Italy
¹² Nigde Omer Halisdemir University, Science and Art Faculty, Department of Physics, 51200, Nigde, Turkey
¹³ Centre de Sciences Nucléaires et Sciences de la Matière, CNRS/IN2P3, Université Paris-Saclay, 91405, Orsay, France
¹⁴ Research Center for Nuclear Physics, Osaka University, Osaka, Japan
¹⁵ Department of Physics and Astronomy, Uppsala University, SE-75120, Uppsala, Sweden
¹⁶ Heavy Ion Laboratory, University of Warsaw, Pasteura 5A, PL 02-093, Warsaw, Poland
¹⁷ University of Jyväskylä, Department of Physics, FI-40014, Jyväskylä, Finland
¹⁸ Department of Physics, Tsinghua University, 100084, Beijing, China

^* e-mail: ertoprak@kth.se

Received: 10 May 2018
Accepted: 10 August 2018
Published online: 3 September 2018

Abstract

Lifetimes of high-spin states have been measured in the semi-magic $(N=50)$ nucleus ⁹⁴Ru. Excited states in ⁹⁴Ru were populated in the ⁵⁸Ni(⁴⁰Ca, 4p)⁹⁴Ru^* fusion-evaporation reaction at the Grand Accélérateur National d’Ions Lourds (GANIL) accelerator complex. DSAM lifetime analysis was performed on the Doppler broadened line shapes in energy spectra obtained from $\gamma$ -rays emitted while the residual nuclei were slowing down in a thick 6mg/cm^2 metallic ⁵⁸Ni target. In total eight excited-state lifetimes in the angular momentum range $I = (13-20)\hbar$ have been measured, five of which were determined for the first time. The corresponding B(M1) and B(E2) reduced transition strengths are discussed within the framework of large-scale shell model calculations to study the contribution of different particle-hole configurations, in particular for analyzing contributions from core-excited configurations.