Occurrence of a chiral-like pair band and a six-nucleon noncollective oblate isomer in 120 I

B. Moon, C. B. Moon, G. D. Dracoulis, R. A. Bark, A. P. Byrne, P. A. Davidson, G. J. Lane, T. Kibédi, A. N. Wilson, C. Yuan, Byungsik Hong

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

We report for the first time two distinctive features in the odd–odd nucleus 120 I: a pair of doublet bands and a high-spin isomer built on the πh 11/2 νh 11/2 configuration. For producing the excited states of 120 I, a fusion-evaporation reaction 118 Sn( 6 Li, 4n) at E=lab48 MeV was employed. The beam was provided by the 14UD tandem accelerator of the Heavy Ion Accelerator Facility at the Australian National University. The observed doublet structure built on the positive-parity states is the first case and unique in isotopes with Z=53. The emerging properties are indicative of the known chiral characteristics, leading to a doubling of states for the πh 11/2 νh 11/2 configuration. In contrast, the high-spin isomer with a half-life of 49(2) ns at spin-parity J π =25 + can be explained in terms of a noncollective oblate structure with the full alignment of six valence nucleons outside the 114 Sn core: three protons (g 7/2 ) 1 (d 5/2 ) 1 (h 11/2 ) 1 and three neutrons (h 11/2 ) 3 . This is an outstanding case that reveals a pure single-particle structure consisting of equal numbers of valence protons and neutrons outside the semi-double shell closure of 114 Sn with Z=50 and N=64.

Original languageEnglish
Pages (from-to)602-606
Number of pages5
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume782
DOIs
Publication statusPublished - 2018 Jul 10

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isomers
occurrences
parity
valence
neutrons
ion accelerators
protons
configurations
nucleons
half life
closures
emerging
heavy ions
accelerators
isotopes
fusion
alignment
evaporation
nuclei
excitation

Keywords

  • Chiral-like pair band
  • In-beam γ-ray spectroscopy
  • Iodine
  • Isomer

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

Occurrence of a chiral-like pair band and a six-nucleon noncollective oblate isomer in 120 I . / Moon, B.; Moon, C. B.; Dracoulis, G. D.; Bark, R. A.; Byrne, A. P.; Davidson, P. A.; Lane, G. J.; Kibédi, T.; Wilson, A. N.; Yuan, C.; Hong, Byungsik.

In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 782, 10.07.2018, p. 602-606.

Research output: Contribution to journalArticle

Moon, B. ; Moon, C. B. ; Dracoulis, G. D. ; Bark, R. A. ; Byrne, A. P. ; Davidson, P. A. ; Lane, G. J. ; Kibédi, T. ; Wilson, A. N. ; Yuan, C. ; Hong, Byungsik. / Occurrence of a chiral-like pair band and a six-nucleon noncollective oblate isomer in 120 I In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2018 ; Vol. 782. pp. 602-606.
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AU - Davidson, P. A.

AU - Lane, G. J.

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AB - We report for the first time two distinctive features in the odd–odd nucleus 120 I: a pair of doublet bands and a high-spin isomer built on the πh 11/2 νh 11/2 configuration. For producing the excited states of 120 I, a fusion-evaporation reaction 118 Sn( 6 Li, 4n) at E=lab48 MeV was employed. The beam was provided by the 14UD tandem accelerator of the Heavy Ion Accelerator Facility at the Australian National University. The observed doublet structure built on the positive-parity states is the first case and unique in isotopes with Z=53. The emerging properties are indicative of the known chiral characteristics, leading to a doubling of states for the πh 11/2 νh 11/2 configuration. In contrast, the high-spin isomer with a half-life of 49(2) ns at spin-parity J π =25 + can be explained in terms of a noncollective oblate structure with the full alignment of six valence nucleons outside the 114 Sn core: three protons (g 7/2 ) 1 (d 5/2 ) 1 (h 11/2 ) 1 and three neutrons (h 11/2 ) 3 . This is an outstanding case that reveals a pure single-particle structure consisting of equal numbers of valence protons and neutrons outside the semi-double shell closure of 114 Sn with Z=50 and N=64.

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