Study of even-mass Ba nuclei by the (p, t) reaction

doi:10.1016/0375-9474(80)90309-7

Nuclear Physics A

Volume 341, Issue 2, 2 June 1980, Pages 206-218

https://doi.org/10.1016/0375-9474(80)90309-7 Get rights and content

Abstract

The (p, t) reaction on the nuclei ^{134, 136, 138}Ba has been studied at a bombarding energy of 52 MeV. Angular distributions of emitted tritons were obtained between 6° and 60°. The following six negative-parity states were strongly excited by the (p, t) reaction: 5⁻(2.121 MeV) and 7⁻(2.482 MeV) in ¹³²Ba, 5⁻(1.998 MeV) and 7⁻(2.274 MeV) in ¹³⁴Ba, and 5⁻(2.139 MeV) and 7⁻(2.031 MeV) in ¹³⁶Ba. DWBA calculations using the code DWUCK successfully reproduce these angular distributions. The 0⁺ assignment to the 1.761 MeV level in ¹³⁴Ba is confirmed. Intensities of the (p, t) reaction for low-lying states are discussed.

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Benchmarking 136Xe neutrinoless ββ decay matrix element calculations with the 138Ba(p,t) reaction
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We used a high-resolution magnetic spectrograph to study neutron pair-correlated $0^{+}$ states in ¹³⁶Ba, produced via the ${}^{138}{Ba} (p, t)$ reaction. In conjunction with state-of-the-art shell model calculations, these data benchmark part of the dominant Gamow-Teller component of the nuclear matrix element (NME) for ¹³⁶Xe neutrinoless double beta ( $0 ν β β$ ) decay. We demonstrate for the first time an evaluation of part of a $0 ν β β$ decay NME by use of an experimental observable, presenting a new avenue of approach for more accurate calculations of $0 ν β β$ decay matrix elements.
Nuclear data sheets for A = 132
2005, Nuclear Data Sheets
Nuclear spectroscopic information for known nuclides of mass number 132 (Cd,In,Sn,Sb,Te,I,Xe,Cs,Ba,La, Ce,Pr,Nd,Pm,Sm,Eu) with $Z = 48$ to 63 and $N = 84$ to 69 have been evaluated and presented together with adopted energies and Jπ of levels in these nuclei. No excited state data are yet available for ¹³²Cd. The identification of the ¹³²Eu nuclide remains uncertain. Fairly rich structures are known in all the other $A = 132$ nuclides. Superdeformed structures are known in ¹³²Pr (four SD bands and a highly-deformed structure) and in ¹³²Nd (four SD or highly-deformed bands). Possible chiral doublet bands of $π h_{11 / 2} ν h_{11 / 2}$ configuration have recently been identified in ¹³²Pr, ¹³²La and ¹³²Cs. The decay scheme of ¹³²La to ¹³²Ba has been studied in several works, including some recent papers, but in the opinion of the evaluators, this decay scheme still suffers from incompleteness, especially from the point-of-view of separate level schemes from the ground state and the isomeric activities. The separate level schemes from two activities of ¹³²Sb decay to ¹³²Te are also not well established, although, the combined activity has recently been studied by the Yale group. This evaluation represents a complete update of previous evaluations of $A = 132$ : by Yu.V. Sergeenkov (1992Se04); and by H.R. Hiddleston and C.P. Browne (1976Hi02).
Nuclear data sheets for A = 136
2002, Nuclear Data Sheets
Nuclear data sheets update for A = 136
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Level scheme and mixed-symmetry states of 134Ba from in-beam (n, n′γ) measurements
1992, Nuclear Physics, Section A
The decay properties of the existed states of ¹³⁴Ba below 3 MeV have been studied with the (n, n′γ) reaction. From γ-ray excitation function and angular distribution measurements, several new levels, spin-parity values and multipole mixing ratios were obtained. Lifetimes were measured by the Doppler-shift attenuation method, and reduced transition probabilities were calculated for a number of levels using the proton-neutron interacting boson model. The 2029 and 2088 keV states appear to share the properties of the lowest mixed-symmetry 2⁺ state.
Nuclear data sheets for A = 132
1992, Nuclear Data Sheets

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Nuclear Physics A

Abstract

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Benchmarking <sup>136</sup>Xe neutrinoless ββ decay matrix element calculations with the <sup>138</sup>Ba(p,t) reaction

Nuclear data sheets for A = 132

Nuclear data sheets for A = 136

Nuclear data sheets update for A = 136

Level scheme and mixed-symmetry states of <sup>134</sup>Ba from in-beam (n, n′γ) measurements

Nuclear data sheets for A = 132