The T=2 mirrors Ca-36 and S-36: A test for isospin symmetry of shell gaps at the driplines

P. Doornenbal; P. Reiter; H. Grawe; T. Otsuka; A. Al-Khatib; A. Banu; T. Beck; F. Becker; P. Bednarczyk; G. Benzoni; A. Bracco; A. Buerger; L. Caceres; F. Camera; S. Chmel; M. Gorska; J. Grebosz; H. Huebel; M. Kavatsyuk; O. Kavatsyuk; M. Kmiecik; I. Kojouharov; N. Kurz; R. Lozeva; A. Maj; S. Mandal; W. Meczynski; B. Million; Zs. Podolyak; A. Richard; N. Saito; T. Saito; H. Schaffner; M. Seidlitz; T. Striepling; Y. Utsuno; J. Walker; N. Warr; H. Weick; O. Wieland; M. Winkler; H. J. Wollersheim

doi:10.1016/j.physletb.2007.02.001

The T=2 mirrors Ca-36 and S-36: A test for isospin symmetry of shell gaps at the driplines

P. Doornenbal, P. Reiter^*, H. Grawe, T. Otsuka, A. Al-Khatib, A. Banu, T. Beck, F. Becker, P. Bednarczyk, G. Benzoni, A. Bracco, A. Buerger, L. Caceres, F. Camera, S. Chmel, M. Gorska, J. Grebosz, H. Huebel, M. Kavatsyuk, O. KavatsyukM. Kmiecik, I. Kojouharov, N. Kurz, R. Lozeva, A. Maj, S. Mandal, W. Meczynski, B. Million, Zs. Podolyak, A. Richard, N. Saito, T. Saito, H. Schaffner, M. Seidlitz, T. Striepling, Y. Utsuno, J. Walker, N. Warr, H. Weick, O. Wieland, M. Winkler, H. J. Wollersheim

^*Corresponding author for this work

Research output: Contribution to journal › Article › Academic › peer-review

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Abstract

The first excited 2(+) state of Ca-36 has been identified by its gamma-decay, exploiting the two-step fragmentation technique at the FRS-RISING setup at GSI. This is the heaviest T-Z = -2 nucleus in the Segre chart in which a gamma-decay of an excited state has been observed. A stable beam of Ca-40 at 420A MeV impinged on a primary Be-9 target. Out of the secondary beam of fragmentation products, Ca-37 was separated by the FRS and struck on a second Be-9 target at the final focus of the FRS. The energy for the 2(1)(+) decay of Ca-36 was determined to be 3015(16) keV, which is 276 keV lower than in its T = 2 mirror S-36. This mirror energy difference (MED) is discussed in the framework of shell model calculations using a O-16 core, the sd shell isospin symmetric interaction USD and experimental single-particle energies from O-17 and F-17. The results show that the MED within the sd shell provide a sensitive test for the evolution of the N, Z = 14, 16 subshell gaps towards the driplines. Especially the N, Z = 16 gap is determined by Thomas-Ehrman shift in the A = 17, T = 1/2 isospin doublet, while Coulomb effects are found to have marginal influence. (c) 2007 Elsevier B.V. All rights reserved.

Original language	English
Pages (from-to)	237-242
Number of pages	6
Journal	Physics Letters B
Volume	647
Issue number	4
DOIs	https://doi.org/10.1016/j.physletb.2007.02.001
Publication status	Published - 12-Apr-2007
Externally published	Yes

Keywords

EXCITED-STATES
NEUTRON
NUCLEI
IDENTIFICATION
SPECTROSCOPY
ISOTOPES
DECAY
MODEL

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The mirrors 36Ca and 36S: A test for isospin symmetry of shell gaps at the driplines
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Doornenbal, P., Reiter, P., Grawe, H., Otsuka, T., 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., ... Wollersheim, H. J. (2007). The T=2 mirrors Ca-36 and S-36: A test for isospin symmetry of shell gaps at the driplines. Physics Letters B, 647(4), 237-242. https://doi.org/10.1016/j.physletb.2007.02.001

@article{2ecced8d21f44f97a8a643687b4573c1,

title = "The T=2 mirrors Ca-36 and S-36: A test for isospin symmetry of shell gaps at the driplines",

abstract = "The first excited 2(+) state of Ca-36 has been identified by its gamma-decay, exploiting the two-step fragmentation technique at the FRS-RISING setup at GSI. This is the heaviest T-Z = -2 nucleus in the Segre chart in which a gamma-decay of an excited state has been observed. A stable beam of Ca-40 at 420A MeV impinged on a primary Be-9 target. Out of the secondary beam of fragmentation products, Ca-37 was separated by the FRS and struck on a second Be-9 target at the final focus of the FRS. The energy for the 2(1)(+) decay of Ca-36 was determined to be 3015(16) keV, which is 276 keV lower than in its T = 2 mirror S-36. This mirror energy difference (MED) is discussed in the framework of shell model calculations using a O-16 core, the sd shell isospin symmetric interaction USD and experimental single-particle energies from O-17 and F-17. The results show that the MED within the sd shell provide a sensitive test for the evolution of the N, Z = 14, 16 subshell gaps towards the driplines. Especially the N, Z = 16 gap is determined by Thomas-Ehrman shift in the A = 17, T = 1/2 isospin doublet, while Coulomb effects are found to have marginal influence. (c) 2007 Elsevier B.V. All rights reserved.",

keywords = "EXCITED-STATES, NEUTRON, NUCLEI, IDENTIFICATION, SPECTROSCOPY, ISOTOPES, DECAY, MODEL",

author = "P. Doornenbal and P. Reiter and H. Grawe and T. Otsuka and A. Al-Khatib and A. Banu and T. Beck and F. Becker and P. Bednarczyk and G. Benzoni and A. Bracco and A. Buerger and L. Caceres and F. Camera and S. Chmel and M. Gorska and J. Grebosz and H. Huebel and M. Kavatsyuk and O. Kavatsyuk and M. Kmiecik and I. Kojouharov and N. Kurz and R. Lozeva and A. Maj and S. Mandal and W. Meczynski and B. Million and Zs. Podolyak and A. Richard and N. Saito and T. Saito and H. Schaffner and M. Seidlitz and T. Striepling and Y. Utsuno and J. Walker and N. Warr and H. Weick and O. Wieland and M. Winkler and Wollersheim, {H. J.}",

year = "2007",

month = apr,

day = "12",

doi = "10.1016/j.physletb.2007.02.001",

language = "English",

volume = "647",

pages = "237--242",

journal = "Physics Letters B",

issn = "0370-2693",

publisher = "ELSEVIER SCIENCE BV",

number = "4",

}

Doornenbal, P, Reiter, P, Grawe, H, Otsuka, T, 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, Z, 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, HJ 2007, 'The T=2 mirrors Ca-36 and S-36: A test for isospin symmetry of shell gaps at the driplines', Physics Letters B, vol. 647, no. 4, pp. 237-242. https://doi.org/10.1016/j.physletb.2007.02.001

TY - JOUR

T1 - The T=2 mirrors Ca-36 and S-36

T2 - A test for isospin symmetry of shell gaps at the driplines

AU - Doornenbal, P.

AU - Reiter, P.

AU - Grawe, H.

AU - Otsuka, T.

AU - Al-Khatib, A.

AU - Banu, A.

AU - Beck, T.

AU - Becker, F.

AU - Bednarczyk, P.

AU - Benzoni, G.

AU - Bracco, A.

AU - Buerger, A.

AU - Caceres, L.

AU - Camera, F.

AU - Chmel, S.

AU - Gorska, M.

AU - Grebosz, J.

AU - Huebel, H.

AU - Kavatsyuk, M.

AU - Kavatsyuk, O.

AU - Kmiecik, M.

AU - Kojouharov, I.

AU - Kurz, N.

AU - Lozeva, R.

AU - Maj, A.

AU - Mandal, S.

AU - Meczynski, W.

AU - Million, B.

AU - Podolyak, Zs.

AU - Richard, A.

AU - Saito, N.

AU - Saito, T.

AU - Schaffner, H.

AU - Seidlitz, M.

AU - Striepling, T.

AU - Utsuno, Y.

AU - Walker, J.

AU - Warr, N.

AU - Weick, H.

AU - Wieland, O.

AU - Winkler, M.

AU - Wollersheim, H. J.

PY - 2007/4/12

Y1 - 2007/4/12

N2 - The first excited 2(+) state of Ca-36 has been identified by its gamma-decay, exploiting the two-step fragmentation technique at the FRS-RISING setup at GSI. This is the heaviest T-Z = -2 nucleus in the Segre chart in which a gamma-decay of an excited state has been observed. A stable beam of Ca-40 at 420A MeV impinged on a primary Be-9 target. Out of the secondary beam of fragmentation products, Ca-37 was separated by the FRS and struck on a second Be-9 target at the final focus of the FRS. The energy for the 2(1)(+) decay of Ca-36 was determined to be 3015(16) keV, which is 276 keV lower than in its T = 2 mirror S-36. This mirror energy difference (MED) is discussed in the framework of shell model calculations using a O-16 core, the sd shell isospin symmetric interaction USD and experimental single-particle energies from O-17 and F-17. The results show that the MED within the sd shell provide a sensitive test for the evolution of the N, Z = 14, 16 subshell gaps towards the driplines. Especially the N, Z = 16 gap is determined by Thomas-Ehrman shift in the A = 17, T = 1/2 isospin doublet, while Coulomb effects are found to have marginal influence. (c) 2007 Elsevier B.V. All rights reserved.

AB - The first excited 2(+) state of Ca-36 has been identified by its gamma-decay, exploiting the two-step fragmentation technique at the FRS-RISING setup at GSI. This is the heaviest T-Z = -2 nucleus in the Segre chart in which a gamma-decay of an excited state has been observed. A stable beam of Ca-40 at 420A MeV impinged on a primary Be-9 target. Out of the secondary beam of fragmentation products, Ca-37 was separated by the FRS and struck on a second Be-9 target at the final focus of the FRS. The energy for the 2(1)(+) decay of Ca-36 was determined to be 3015(16) keV, which is 276 keV lower than in its T = 2 mirror S-36. This mirror energy difference (MED) is discussed in the framework of shell model calculations using a O-16 core, the sd shell isospin symmetric interaction USD and experimental single-particle energies from O-17 and F-17. The results show that the MED within the sd shell provide a sensitive test for the evolution of the N, Z = 14, 16 subshell gaps towards the driplines. Especially the N, Z = 16 gap is determined by Thomas-Ehrman shift in the A = 17, T = 1/2 isospin doublet, while Coulomb effects are found to have marginal influence. (c) 2007 Elsevier B.V. All rights reserved.

KW - EXCITED-STATES

KW - NEUTRON

KW - NUCLEI

KW - IDENTIFICATION

KW - SPECTROSCOPY

KW - ISOTOPES

KW - DECAY

KW - MODEL

U2 - 10.1016/j.physletb.2007.02.001

DO - 10.1016/j.physletb.2007.02.001

M3 - Article

SN - 0370-2693

VL - 647

SP - 237

EP - 242

JO - Physics Letters B

JF - Physics Letters B

IS - 4

ER -

The T=2 mirrors Ca-36 and S-36: A test for isospin symmetry of shell gaps at the driplines

Abstract

Keywords

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