Unexpected 5/2- spin of the ground state in 147 Ba: No octupole deformation in ground states of odd- A Ba isotopes

Rząca-Urban, T.; Urban, W.; Smith, A. G.; Ahmad, I.; Syntfeld-Każuch, A.

doi:10.1103/PhysRevC.87.031305

Unexpected $5 / 2^{-}$ spin of the ground state in $^{147}$ Ba: No octupole deformation in ground states of odd- $A$ Ba isotopes

Journal Article · Fri Mar 01 04:00:00 EST 2013 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PhysRevC.87.031305· OSTI ID:1419855

Rząca-Urban, T.; Urban, W.; Smith, A. G.; Ahmad, I.; Syntfeld-Każuch, A.

The ¹⁴⁷Ba nucleus has been studied in prompt γ-ray spectroscopy using the EUROGAM2 Ge array. Spin and parity of the ground state has been determined to be 5/2^-. The unexpected, 5/2^- ground state results from interaction with other negative-parity configurations. A new ground-state band has been established in ¹⁴⁷Ba and some previously reported levels have been arranged into a 3/2^- band, which may correspond to the 3/2^-[532] configuration. The new spin assignments in ¹⁴⁷Ba suggest that the theoretical predictions of static octupole deformation in the ground state of ¹⁴⁷Ba may not be be valid. No candidates for parity doublets have been found in ¹⁴⁷Ba. Instead, an octupole band built on the ground state has been proposed.

Research Organization:: Argonne National Laboratory (ANL)

Sponsoring Organization:: USDOE Office of Science - Office of Nuclear Physics

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1419855

Journal Information:: Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 87; ISSN 0556-2813; ISSN PRVCAN

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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Unexpected 5/2- spin of the ground state in 147 Ba: No octupole deformation in ground states of odd- A Ba isotopes

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Unexpected $5 / 2^{-}$ spin of the ground state in $^{147}$ Ba: No octupole deformation in ground states of odd- $A$ Ba isotopes