Title: The T=2 mirrors Ca-36 and S-36: A test for isospin symmetry of shell gaps at the driplines
Authors: Doornenbal, P ×
Reiter, P
Grawe, H
Otsuka, Taka
Al-Khatib, A
Banu, A
Beck, T
Becker, F
Bednarczyk, P
Benzoni, G
Bracco, A
Buerger, A
Caceres, L
Camera, F
Chmel, S
Gorska, M
Grebosz, J
Huebel, H
Kavatsyuk, M
Kavatsyuk, O
Kmiecik, M
Kojouharov, I
Kurz, N
Lozeva, R
Maj, A
Mandal, S
Meczynski, W
Million, B
Podolyak, Zs
Richard, A
Saito, N
Saito, T
Schaffner, H
Seidlitz, M
Striepling, T
Utsuno, Y
Walker, J
Warr, N
Weick, H
Wieland, O
Winkler, M
Wollersheim, H. J #
Issue Date: 2007
Series Title: Physics Letters B vol:647 issue:4 pages:237-242
Abstract: The first excited 2+2+ state of 36Ca has been identified by its γ -decay, exploiting the two-step fragmentation technique at the FRS-RISING setup at GSI. This is the heaviest Tz=−2Tz=−2 nucleus in the Segré chart in which a γ-decay of an excited state has been observed. A stable beam of 40Ca at View the MathML source420AMeV impinged on a primary 9Be target. Out of the secondary beam of fragmentation products, 37Ca was separated by the FRS and struck on a second 9Be target at the final focus of the FRS. The energy for the View the MathML source21+ decay of 36Ca was determined to be 3015(16) keV, which is 276 keV lower than in its T=2T=2 mirror 36S. This mirror energy difference (MED) is discussed in the framework of shell model calculations using a 16O core, the sd shell isospin symmetric interaction USD and experimental single-particle energies from 17O and 17F. The results show that the MED within the sd shell provide a sensitive test for the evolution of the N , Z=14,16Z=14,16 subshell gaps towards the driplines. Especially the N , Z=16Z=16 gap is determined by Thomas–Ehrman shift in the A=17A=17, T=1/2T=1/2 isospin doublet, while Coulomb effects are found to have marginal influence.
ISSN: 0370-2693
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Non-KU Leuven Association publications
× corresponding author
# (joint) last author

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