Spectroscopy of neutron-rich scandium isotopes

P Koseoglou,H Toernqvist,T Lokotko,I Murray,K Yoneda,Masahiro Yasuda ,C Hilaire,K I Hahn,H Liu,Ö Aktaş ,S Franchoo,P Doornenbal,F Flavigny,J Lee,P.-A Söderström,N L Achouri ,M Maccormick,D Yan,Y Sun ,W Rodríguez ,T Isobe,A Delbart,A Obertelli,J Gibelin,Y Kondo,J.-M Gheller ,Yuki Kubota ,T Koiwai,M L Cortés,M Lettmann,N Pietralla,N Paul,I Gašparić ,F Château,H Sakuraï ,K Wimmer,Takashi Nakamura ,Z Yang,H Baba,T Motobayashi,V Wagner,T Aumann,D Sohler,Y Togano,C Lehr,V Panin,A Giganon,Hiroki Yamada ,X Xu,E Šahin ,S.y Park ,D Rossi,V Lapoux,B D Linh,A Gillibert,F Browne,D Steppenbeck,L Stuhl,R.-B Gerst,N Chiga,M Sasano,A Corsi,T Uesaka,T Kobayashi,V Werner,K Moschner,D Calvet,L X Chung,S Wang,H Otsu,D Kim,Satoshi Takeuchi ,S Chen,V Vaquero,L Zanetti

doi:10.1088/1742-6596/1555/1/012026

Abstract

Within the SEASTAR III campaign at the Radioactive Isotope Beam Factory, at the RIKEN Nishina Center, neutron-rich isotopes in the vicinity of 53K were produced from the fragmentation of the primary 70Zn beam on a 9Be target. After nucleon knockout reactions on the secondary liquid hydrogen MINOS target the known γ rays of the neutron-rich 55Sc isotope were observed (shown in this proceedings) and γ rays from 57,59Sc isotopes have been identified for the first time. The evolution of the occupied nucleon orbitals of these nuclei in the ground and excited state is investigated under the prism of the tensor force.

Highlights

Due to the tensor force, the single-particle energies are shifted as protons or neutrons occupy certain orbitals, causing the magic numbers to change for nuclei far from β-stability
The questions that arise are: is the interaction strong enough so it will cause the νf5/2 orbital energy to be lower than the νp1/2 energy? And in which isotope the order of filling the νf5/2 and νp1/2 orbitals is again the ordinary order, like in the stable isotopes? Compare Figures 4 and 5
Information on the nature of the excitations in the 55,57,59,61Sc isotopes can be provided by the observation of the level schemes and the spin and parity assignment of the levels. Experimental data for these neutron-rich isotopes were collected within the SEASTAR III campaign

Summary

IOP Publishing

P. Koseoglou1,2, V. Werner1, N. Pietralla1, P.-A. Soderstrom1,2, P. Doornenbal3, A. Obertelli4,1,3, N. Achouri4, H. Baba3, F. Browne3, D. Calvet4, F. Chateau4, S. Chen5,6,3, N. Chiga3, A. Corsi4, M. L. Cortes3, A. Delbart4, J-M. Gheller4, A. Giganon4, A. Gillibert4, C. Hilaire4, T. Isobe3, T. Kobayashi7, Y. Kubota3,8, V. Lapoux4, H. Liu4,9, T. Motobayashi3, I. Murray3,10, H. Otsu3, V. Panin3, N. Paul4, W. Rodriguez11,3, H. Sakurai3,12, M. Sasano3, D. Steppenbeck3, L. Stuhl8, Y. L. Sun4, Y. Togano13,3, T. Uesaka3, K. Wimmer12,3, K. Yoneda3, O. Aktas9, T. Aumann1, L. X. Chung14, F. Flavigny10, S. Franchoo10, I. Gasparic3,15, R.-B. Gerst16, J. Gibelin17, K. I. Hahn18, D. Kim19, T. Koiwai12, Y. Kondo20, J. Lee6, C. Lehr1, M. Lettmann1, B. D. Linh14, T. Lokotko6, M. MacCormick10, K. Moschner16, T. Nakamura20, S. Y. Park19, D. Rossi1, E. Sahin21, D. Sohler22, S. Takeuchi20, H. Toernqvist1,2,3 V. Vaquero23, V. Wagner1, S. Wang24, X. Xu6, H. Yamada20, D. Yan24, Z. Yang3, M. Yasuda20 and L. Zanetti1.

Published under licence by IOP Publishing Ltd

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