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

doi:10.1103/PhysRevLett.111.262501

Title: Split Isobaric Analog State in ${}^{55}{Ni}$ : 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:

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

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

Publication Date:: 2013-12-26

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.

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                    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.

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                    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.

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@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}

}

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DOI: 10.1103/PhysRevLett.111.262501

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Figures / Tables:

FIG. 1. : (Color online) (a) Energy loss spectrum of the secondary beam observed at PIN1. (b) Time difference between a ⁵⁵Cu implant and a positron detected within the same pixel in coincidence with $γ$ transitions in the daughter ⁵⁵Ni. (c) High energy portion of $β$ delayed $γ$ spectrum observedmore »

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Similar Records

Title: Split Isobaric Analog State in Ni 55 : Case of Strong Isospin Mixing

Abstract

Citation Formats

Figures / Tables:

From isotopes to the stars journal, May 2011

Coulomb energy differences between high-spin states in isobaric multiplets journal, October 2007

Observation of a Large Atomic Parity Violation Effect in Ytterbium journal, August 2009

γ decay and splitting of the first analog state in Mn 53 , Co 55 , and Cu 59 journal, May 1978

Chaotic Wave Functions and Exponential Convergence of Low-Lying Energy Eigenvalues journal, March 1999

�ber den Bau der Atomkerne. I journal, January 1932

β decay of proton-rich nucleus Al 23 and astrophysical consequences journal, October 2006

MASS MEASUREMENT OF 45 Cr AND ITS IMPACT ON THE Ca-Sc CYCLE IN X-RAY BURSTS journal, March 2013

High efficiency beta-decay spectroscopy using a planar germanium double-sided strip detector journal, November 2013

Empirical isospin-nonconserving hamiltonians for shell-model calculations journal, January 1989

Coulomb displacement energies of the A = 4 n + 3 , T = 1 2 mirror nuclei in the 1 f 7 2 shell journal, April 1977

Effective interaction for pf -shell nuclei journal, May 2002

Commissioning the A1900 projectile fragment separator journal, May 2003

The decay of proton-rich nuclei in the mass region journal, August 2007

Variation in Displacement Energies Due to Isospin-Nonconserving Forces journal, April 2013

Thirty-two-fold segmented germanium detectors to identify γ-rays from intermediate-energy exotic beams journal, July 2001

New “USD” Hamiltonians for the sd shell journal, September 2006

A study of the (p, d) reactions on A = 12–94 nuclei by 65 MeV polarized protons journal, July 1980

Delayed Proton Radioactivities journal, December 1977

Radio Frequency Fragment Separator at NSCL journal, July 2009

Digital Data Acquisition System for experiments with segmented detectors at National Superconducting Cyclotron Laboratory journal, November 2009

New effective interaction for p f -shell nuclei and its implications for the stability of the N = Z = 28 closed core journal, March 2004

Nuclear structure and the search for collective enhancement of {\cal P\hbox{,}T} -violating Schiff moments journal, August 2008

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

From isotopes to the stars
journal, May 2011

Coulomb energy differences between high-spin states in isobaric multiplets
journal, October 2007

Observation of a Large Atomic Parity Violation Effect in Ytterbium
journal, August 2009

$γ$ decay and splitting of the first analog state in ${}^{53}{Mn}$ , ${}^{55}{Co}$ , and ${}^{59}{Cu}$
journal, May 1978

Chaotic Wave Functions and Exponential Convergence of Low-Lying Energy Eigenvalues
journal, March 1999

�ber den Bau der Atomkerne. I
journal, January 1932

β decay of proton-rich nucleus ${}^{23}{Al}$ and astrophysical consequences
journal, October 2006

MASS MEASUREMENT OF ⁴⁵ Cr AND ITS IMPACT ON THE Ca-Sc CYCLE IN X-RAY BURSTS
journal, March 2013

High efficiency beta-decay spectroscopy using a planar germanium double-sided strip detector
journal, November 2013

Empirical isospin-nonconserving hamiltonians for shell-model calculations
journal, January 1989

Coulomb displacement energies of the $A = 4 n + 3$ , $T = \frac{1}{2}$ mirror nuclei in the $1 f_{\frac{7}{2}}$ shell
journal, April 1977

Effective interaction for $pf$ -shell nuclei
journal, May 2002

Commissioning the A1900 projectile fragment separator
journal, May 2003

The decay of proton-rich nuclei in the mass region
journal, August 2007

Variation in Displacement Energies Due to Isospin-Nonconserving Forces
journal, April 2013

Thirty-two-fold segmented germanium detectors to identify γ-rays from intermediate-energy exotic beams
journal, July 2001

New “USD” Hamiltonians for the $sd$ shell
journal, September 2006

A study of the (p, d) reactions on A = 12–94 nuclei by 65 MeV polarized protons
journal, July 1980

Delayed Proton Radioactivities
journal, December 1977

Radio Frequency Fragment Separator at NSCL
journal, July 2009

Digital Data Acquisition System for experiments with segmented detectors at National Superconducting Cyclotron Laboratory
journal, November 2009

New effective interaction for $p f$ -shell nuclei and its implications for the stability of the $N = Z = 28$ closed core
journal, March 2004

Nuclear structure and the search for collective enhancement of {\cal P\hbox{,}T} -violating Schiff moments
journal, August 2008