Split Isobaric Analog State in : Case of Strong Isospin Mixing
Abstract
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.
- Authors:
- Florida State Univ., Tallahassee, FL (United States)
- Michigan State Univ., East Lansing, MI (United States)
- Publication Date:
- Research Org.:
- Nuclear Science and Security Consortium, Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE National Nuclear Security Administration (NNSA)
- OSTI Identifier:
- 1454856
- Grant/Contract Number:
- NA0000979
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review Letters
- Additional Journal Information:
- Journal Volume: 111; Journal Issue: 26; Journal ID: ISSN 0031-9007
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 74 ATOMIC AND MOLECULAR PHYSICS
Citation Formats
Tripathi, Vandana, Tabor, S. L., Volya, A., Liddick, S. N., Bender, P. C., Larson, N., Prokop, C., Suchyta, S., Tai, P. -L., and VonMoss, J. M. Split Isobaric Analog State in Ni55 : Case of Strong Isospin Mixing. United States: N. p., 2013.
Web. doi:10.1103/PhysRevLett.111.262501.
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. Split Isobaric Analog State in Ni55 : Case of Strong Isospin Mixing. United States. doi:10.1103/PhysRevLett.111.262501.
Tripathi, Vandana, Tabor, S. L., Volya, A., Liddick, S. N., Bender, P. C., Larson, N., Prokop, C., Suchyta, S., Tai, P. -L., and VonMoss, J. M. Thu .
"Split Isobaric Analog State in Ni55 : Case of Strong Isospin Mixing". United States. doi:10.1103/PhysRevLett.111.262501. https://www.osti.gov/servlets/purl/1454856.
@article{osti_1454856,
title = {Split Isobaric Analog State in Ni55 : Case of Strong Isospin Mixing},
author = {Tripathi, Vandana and Tabor, S. L. and Volya, A. and Liddick, S. N. and Bender, P. C. and Larson, N. and Prokop, C. and Suchyta, S. and Tai, P. -L. and VonMoss, J. M.},
abstractNote = {Study of βþ decay of the exotic Tz = -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.},
doi = {10.1103/PhysRevLett.111.262501},
journal = {Physical Review Letters},
number = 26,
volume = 111,
place = {United States},
year = {2013},
month = {12}
}
Web of Science
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