Evolution of deformation in neutron-rich Ba isotopes up to A=150

R Lică,J Jolie,N Saed-Samii,L M Robledo,S Pascu,F C L Crespi,M Thuerauf,L M Fraile,M J G Borge,V Sánchez-Tembleque,A Bracco,I Homm,R Mărginean,J Kurcewicz,P Van Duppen,V Karayonchev,C Mihai,E Rapisarda,F Camera,F Rotaru,M Madurga,C Costache,N Cieplicka-Oryńczak,N Warr,G Benzoni,M V Lund,V Vedia,H De Witte,J.-M Régis ,J Benito,M Stănoiu ,A Negreţ ,Angie Orduz ,R Bernard ,Tom Berry ,V Pucknell,O Tengblad,H Mach,G Fernández-Martínez ,N Mărginean,H O U Fynbo ,S Ceruti,J R Creswell ,Thilo Kroll ,I Lazarus,Z Patyk,Ch Sotty ,Volha Charviakova ,A I Morales,T R Rodríguez,U Köster,R Mihai ,P T Greenlees,M Huyse,T Kurtukian‐Nieto ,J Konki,P Rahkila,A Turturică

doi:10.1103/physrevc.97.024305

Abstract

The authors are indebted to the late Prof. Henryk Mach whose experience helped in designing and performing the experiment. The IDS Collaboration acknowledges financial support from Istituto di Fisica Nucleare, the Italian Programmi di Ricerca Scientifica di Rilevante Interesse Nazionale (PRIN), contract 2001024324 01302; the European Union seventh framework through ENSAR, contract 262010; the European Unions Horizon 2020 Framework research and innovation program under grant agreement 654002 (ENSAR2); the FATIMA-NuPNET network via the PRI-PIMNUP-2011-1338 project; the Romanian IFA grant CERN/ISOLDE and Romanian PN-II-RU-TE-2014-4-2003; the Spanish MINECO projects, reference numbers FPA2013-41467-P, FPA2015-64969-P, FPA2015-65929, and FIS2015-63770; Spanish grants FIS-2014-53434-P MINECO and Programa Ramon y Cajal 2012 No. 11420, MINECO grant IJCI-2014-19172, and the MINECO project FPA2014-52823-C2-1-P; the German BMBF under contract 05P15PKCIA, contract 05P15PKFNA, and Verbundprojekt 05P2015, the FWO-Vlaanderen (Belgium); and the IAP Belgian Science Policy (BriX network P7/12). V.Ch. and Z.P. acknowledge support by the Polish grant of Narodowe Centrum Nauki, no. 2015/18/M/ST2/00523.

Highlights

IntroductionNuclear interactions within the atomic nucleus can be understood in terms of a monopole part that contains the spherical mean field (spherical single-particle levels) and a multipole part that includes everything else [1]
Nuclear interactions within the atomic nucleus can be understood in terms of a monopole part that contains the spherical mean field and a multipole part that includes everything else [1]
The β decay half-lives of transitions in 147Ba, which are expected to be populated as the β-n channel, were investigated in order to rule out a possible 147Cs contamination in the incoming beam

Summary

Introduction

Nuclear interactions within the atomic nucleus can be understood in terms of a monopole part that contains the spherical mean field (spherical single-particle levels) and a multipole part that includes everything else [1]. The main contributions to the latter term come from the lowest order multipoles (quadrupole and octupole). The competition between the spherical mean field and these multipole contributions in a particular nucleus produces its intrinsic nuclear shape (spherical, quadrupole and/or octupole deformed, etc.). Barium isotopes (Z = 56) are located in a region of the Segrè chart characterized by a variety of shape-related phenomena, including shape coexistence and possible static octupole deformation. The evolution of the nuclear shape with the number of nucleons is usually studied from mean-field calculations of potential energy surfaces (PESs) defined along multidimensional deformation spaces. Low-lying negative-parity states have been found in 122–126Ba, whose character is understood in terms of octupole correlations [8]

Results

Discussion

Conclusion