A Fiftysix Channel Goniometer

“…Further, the assignment I~=6 + is improbable due to the absence of an E2 transition of 1627.6keV leading to the 1 362.1 keV 4 + state. When the spin is I=7, the angular correlation result for the 223.9-989.6keV cascade implies for the 223.9 keV transition ~= -0.36(10), or 6=-4.1 (16). This indicates the transition to be parity-unfavoured; then the characteristics of the level are I~= 7 +.…”

Section: Angular Correlation Measurementsmentioning

confidence: 91%

“…The limit of the log .lt values in these cases has been calculated by assuming an uncertainty of two standard deviations in the intensity 56-channel goniometer described in Ref. 16. Two of the eight NaI(T1) detectors, used in the previous version of the instrument, were replaced by Ge(Li) detectors.…”

Section: Angular Correlation Measurementsmentioning

confidence: 99%

Levels and transitions in126Te

et al. 1975

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Abstract. The decay of 126Sb to 126Te is studied by use of Ge(Li) detectors in singles and coincidence arrangements. The gamma-gamma directional correlations of six cascades are measured. A level scheme is constructed where all transitions observed are located. The characteristics of several of the levels are assigned, on basis of the log ft values deduced and the directional correlation results. Mixing ratios are deduced for three transitions. From the comparison of the relative intensities of E1 and E2 transitions depopulating the same levels, three E 1 transitions are concluded to be strongly retarded.

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“…The 67.6-(87.2)-1235.2, 87.2-1235.2, and 273.6-1047.9 correlations were measured in two different setups. (i) A sixdetector system, a modification of the earlier described eight-detector multichannel goniometer (MCG) [18]. The low-energy component was detected in a Ge(Li) detector, and the high-energy component in five fixed NaI(TI) detectors.…”

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confidence: 99%

Levels and transitions in136Ba

et al. 1973

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Excited states of 136Ba are studied in the beta decay of 136Cs. The gamma spectrum is measured with high-resolution and coincidence techniques. Several new transitions are suggested to be connected with two recently reported levels. Gamma-gamma directional correlations are performed in an attempt to determine the characteristics of these levels, and in order to determine mixing ratios. The lifetime of the 2207.5 keV state is remeasured, and the lifetime of the 2140.5 keV state is measured for the first time.The level scheme of larBa has been investigated in the beta decay of 136Cs [1][2][3][4][5][6][7][8] and electron capture of la6La [10,11], and in neutron capture [12][13][14][15] and inelastic scattering [16]. The nucleus la6Ba may be regarded as transitional in the sense that the low-lying excitations have been described in terms of a quasi-rotational band [17], and as phonon states [11]. The first excited states, with I~=2 +, 2 +, 0 +, and 4 +, occur at 818.6, 1551.1, 1579.0, and 1866.5 keV, respectively. In an energy region just above the 4 + level many states appear. These states are partly deexcited by highly retarded E1 transitions. In the shell-model picture they are interpreted as two-particle (hole) configurations. A further clarification of the level scheme of this transitional nucleus should be important for elucidating the interaction between the quasi-particles, and the nature of the collective excitations.The decay of ~36Cs has been studied in this work. Due to the spin of the parent, I~= 5 +, preferentially states of fairly high spins are populated in this decay.The 136Cs activity was produced in a (d, e) reaction by irradiating enriched (99.8~) laSBa, as nitrate, with 25 MeV deutrons at IKO, Amsterdam. A 36 cm 3 Ge (Li) detector was employed in the measurements of the gamma spectrum. Several measurements were performed during 5 half-lives of the source, in order to show that all transitions are charactensed by the decay constant of ~ 3 6Cs. The result of the intensity measurements is presented in Table 1, together with the data by Fr~ina et al. [8].The Ge (Li) detector was used in coincidence with a NaI (T1) detector in order to testify that the new transitions belong to ~a6Ba, and in order to place them in the level scheme. The six weak transitions found in this 1 Z. Physik, Bd. 260

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A Fiftysix Channel Goniometer

Cited by 4 publications

References 6 publications

The Spin of the 1518 keV Level in¹⁷⁴Yb

The Spin of the 1518 keV Level in¹⁷⁴Yb

Levels and transitions in126Te

Levels and transitions in136Ba

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A Fiftysix Channel Goniometer

Cited by 4 publications

References 6 publications

The Spin of the 1518 keV Level in174Yb

The Spin of the 1518 keV Level in174Yb

Levels and transitions in126Te

Levels and transitions in136Ba

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The Spin of the 1518 keV Level in¹⁷⁴Yb

The Spin of the 1518 keV Level in¹⁷⁴Yb