Split Isobaric Analog State in Ni55 : Case of Strong Isospin Mixing

Tripathi, Vandana; Tabor, S. L.; Volya, A.; Liddick, S. N.; Bender, P. C.; Larson, N.; Prokop, C.; Suchyta, S.; Tai, P. -L.; VonMoss, J. M.

doi:10.1103/PhysRevLett.111.262501

Split Isobaric Analog State in ${}^{55}{Ni}$ : Case of Strong Isospin Mixing

Journal Article · Thu Dec 26 00:00:00 EST 2013 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.111.262501· OSTI ID:1454856

Tripathi, Vandana ^[1]; Tabor, S. L. ^[2]; Volya, A. ^[2]; Liddick, S. N. ^[3]; Bender, P. C. ^[2]; Larson, N. ^[3]; Prokop, C. ^[3]; Suchyta, S. ^[3]; Tai, P. -L. ^[2]; VonMoss, J. M. ^[2]

Florida State Univ., Tallahassee, FL (United States); UC Berkeley
Florida State Univ., Tallahassee, FL (United States)
Michigan State Univ., East Lansing, MI (United States)

Study of βþ decay of the exotic T_z = -3=2 nucleus ⁵⁵Cu, via delayed γ rays, has revealed a strongly isospin mixed doublet (4599–4579 keV) in ⁵⁵Ni, which represents the fragmented and previously unknown isobaric analog of the ground state of ⁵⁵Cu. The observed small log $ft$ values to both states in the doublet confirm the superallowed Fermi β decay. The near degeneracy of a pair of 3/2^- levels in 55Ni results in the strong isospin mixing. The isospin mixing matrix element between the T = 3/2 and T = 1/2 levels is inferred from the experiment to be 9(1) keV, which agrees well with the matrix element of the charge symmetry breaking shell model Hamiltonian of Ormand and Brown. A precise value of the half-life of ⁵⁵Cu at 57(3) ms was also obtained.

View Accepted Manuscript (DOE)

Research Organization:: Nuclear Science and Security Consortium, Berkeley, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: NA0000979

OSTI ID:: 1454856

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 26 Vol. 111; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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