On the β-decaying (21+) spin gap isomer in 94Ag

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Abstract

The β decay of 94Ag, a nucleus with three proton and three neutron holes with respect to 100Sn, was investigated at the GSI on-line mass separator by using an array of germanium and silicon detectors. On the basis of a βγγ coincidence measurement, the previously reported decay scheme has been considerably improved and evidence is presented for a spin–gap isomer with a spin-parity assignment of (21+), i.e., the highest spin ever observed in β decay. The half-life of the low-spin isomer (7+) was remeasured to be 0.59(2) s, whereas the half-life of the high-spin isomer was determined as 0.47(8) s. For the states in 94Ag and 94Pd, large-scale shell-model calculations that include up to 4p–4h excitations across the N=Z=50 shell gap and employ a realistic interaction were carried out. These core excitations play a crucial role in generating the E4 isomerism required for the interpretation of the long half-life of the (21+) state in 94Ag.

References (40)

  • J. Cerny

    Nucl. Phys. A

    (1972)
  • A.R. Poletti et al.

    Nucl. Phys. A

    (1987)
  • E. Nolte et al.

    Phys. Lett. B

    (1980)
  • M. La Commara

    Nucl. Phys. A

    (2002)
  • I. Mukha, et al., Nucl. Instrum. Methods, in...
  • G. Audi et al.

    Nucl. Phys. A

    (1993)
  • D.C. Radford

    Nucl. Instrum. Methods Phys. Res. A

    (1995)
  • K. Schmidt

    Z. Phys. A

    (1994)
  • B.A. Brown, A. Etchegoyen, W.D.M. Rae, computer code OXBASH, MSU-NSCL report, 1988, p....
  • J. Blomqvist et al.

    Phys. Scr.

    (1985)
  • S.E. Arnell et al.

    Phys. Rev. C

    (1994)
  • D. Rudolph et al.

    Nucl. Phys. A

    (1996)
  • S.E. Arnell et al.

    Z. Phys. A

    (1993)
  • C. Lingk

    Phys. Rev. C

    (1997)
  • H. Grawe

    Nucl. Phys. A

    (2002)
  • D.F. Geesaman

    Phys. Rev. Lett.

    (1975)
  • I. Perlman et al.

    Phys. Rev.

    (1962)
  • E. Nolte et al.

    Z. Phys A

    (1982)
  • K. Ogawa

    Phys. Rev. C

    (1983)
  • R. Grzywacz

    Phys. Rev. C

    (1997)
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