Nuclear structure of 156Gd studied with (n, γ), (n, e−), (d, p), (d, t) reactions and lifetime measurements

Klora, J.; Börner, H. G.; Egidy, T. von; Georgii, R.; Jolie, J.; Judge, Steven; Khitrov, V. A.; Krusche, B.; Libman, V.A.; Lindner, Helmut; Litvinsky, L. L.; Mayerhofer, U.; Murzin, A.V.; Robinson, S.; Sukhovoj, A. M.; Trieb, H.

doi:10.1016/0375-9474(93)90165-t

Cited by 23 publications

(19 citation statements)

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“…The lifetime value with the lowest 2 was adopted and the respective error estimate performed. This yielded a lifetime of ¼ 0:303 þ0:073 À0:075 ps in good agreement with ¼ 0:200 þ0:050 À0:070 ps published in [10].…”

Section: Nucleussupporting

confidence: 86%

“…The lifetime measurement of the 3 À 1 state in 156 Gd used the Doppler broadening obtained from the 987.948 keV transition in third order dispersive geometry. As already discussed in detail in [10,22] the unknown feeding has a substantial influence on the extracted lifetime value. In order to take this into account the fraction of unknown feeding was simulated by a two step cascade.…”

Section: Nucleusmentioning

confidence: 86%

“…Transition 1288.187 (1) 584.715 3965.134 (6) 1416.078 (21) 1924.49 (4) 2475.82 70 1276.138 (2) 1408.133 (5) 1638.00 (5) 1958.50 (10) 2359.98 (10) 2829.59(10) Because of its focusing diffraction geometry it requires small samples (a few tens of milligrams). Thanks to the diffraction process, the detectors at GAMS have a very small background rate and can detect transitions with a dynamical range of 10 5 .…”

Section: Nucleusmentioning

confidence: 99%

“…3 À 1 transition. In a previous measurement using the bent crystal spectrometers GAMS2/3 [10] the 5 À 1 ! 3 À 1 transition was not observed, probably because of a limited count rate.…”

Section: Nucleusmentioning

confidence: 99%

“…We note that the focus of Ref. [10] was to measure a wide energy range from 50 keV up to 1 MeV. Limiting our experiment to scan only in a small energy region has allowed us to increase the statistical sensitivity.…”

Section: Nucleusmentioning

confidence: 99%

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Ultrahigh-Resolutionγ-Ray Spectroscopy ofGd156: A Test of Tetrahedral Symmetry

et al. 2010

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Tetrahedral symmetry in strongly interacting systems would establish a new class of quantum effects at subatomic scale. Excited states in 156Gd that could carry the information about the tetrahedral symmetry were populated in the 155Gd(n,γ)156Gd reaction and studied using the GAMS4/5 Bragg spectrometers at the Institut Laue-Langevin. We have identified the 5(1)- → 3(1)- transition of 131.983(12) keV in 156Gd and determined its intensity to be 1.9(3)x10(-6) per neutron capture. The lifetime τ=220(-30)(+180) fs of the 5(1)- state in 156Gd has been measured using the GRID technique. The resulting B(E2)=293(-134)(+6) Weisskopf unit rate of the 131.983 keV transition provides the intrinsic quadrupole moment of the 5(1)- state in 156Gd to be Q0=7.1(-1.6)(+0.7) b. This large value, comparable to the quadrupole moment of the ground state in 156Gd, gives strong evidence against tetrahedral symmetry in the lowest odd-spin, negative-parity band of 156Gd.

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Section: Nucleussupporting

confidence: 86%

Section: Nucleusmentioning

confidence: 86%

Section: Nucleusmentioning

confidence: 99%

“…3 À 1 transition. In a previous measurement using the bent crystal spectrometers GAMS2/3 [10] the 5 À 1 ! 3 À 1 transition was not observed, probably because of a limited count rate.…”

Section: Nucleusmentioning

confidence: 99%

Section: Nucleusmentioning

confidence: 99%

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