Construction and use of a three Ge(Li) Compton polarimeter

Butler, P. A.; Carr, P E; Gadeken, L.L.; James, A.N.; Nolan, P. J.; Sharpey‐Schafer, J. F.; Twin, P.J.; Viggars, D.A.

doi:10.1016/0029-554x(73)90530-2

Cited by 98 publications

(12 citation statements)

References 13 publications

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“…The spins and parities for the new rotational structures were successfully assigned using the Directional Correlation from Oriented States (DCO ratios/R DCO ) [81,82] and linear polarization anisotropy (A p ) methods [83]. While A p is given as used in Ref.…”

Section: Experimental Details and Analysismentioning

confidence: 99%

“…The spins and parities for the new rotational structures were successfully assigned using the Directional Correlation from Oriented States (DCO ratios/RDCO) [79,80] and linear polarization anisotropy (Ap) methods [81]. While Ap is given as used in [82], the DCO matrices were constructed using data from detectors in the rings at 158° and 86°+94°, thus the RDCO for the JUROGAM II array in this work is; RDCO = I γ1(at 158º : gated on γ2 near 90 º) / I γ1(near 90º : gated on γ2 at 158º) (…”

Section: Experimental Details and Analysismentioning

confidence: 99%

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Spectroscopy of low-spin states in Dy157 : Search for evidence of enhanced octupole correlations

Majola¹,

Bark²,

Bianco³

et al. 2019

Phys. Rev. C

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Low-spin states of 157 Dy have been studied using the JUROGAM II array, following the 155 Gd (α, 2n) reaction at a beam energy of 25 MeV. The level scheme of 157 Dy has been expanded with four new bands. Rotational structures built on the [523]5/2and [402]3/2 + neutron orbitals constitute new additions to the level scheme as do many of the inter-and intra-band transitions. This manuscript also reports the observation of cross I + → (I-1)and I -→ (I-1) + E1 dipole transitions inter-linking structures built on the [523]5/2 -(band 5) and [402]3/2 + (band 7) neutron orbitals. These interlacing band structures are interpreted as the bands of parity doublets with simplex quantum number s = -i related to possible octupole correlations.Two previous experiments conducted with large Ge detector arrays used heavy-ion induced reactions 150 Nd( 12 C,5n) and 124 Sc( 36 S,3n) [71,72,97] to study the medium to high-spin states of 157 Dy. These experiments reported rotational bands built on the h9/2[521]3/2 -, i13/2[651]3/2 + and h11/2[505]11/2neutrons configurations but reported no transitions linking these structures. To this end we have performed in-beam measurements using the JUROGAM II array to study the rotational bands of 157 Dy and to search for evidence of octupole correlations. We report on four new bands as well as many new linking transitions relative to the previously observed structures.The rotational behaviour of the new bands is described in terms of quasi-particle assignments, and the observed alignment properties are analyzed within the framework of the cranked shell model. II. Experimental details and analysisExcited states of 157 Dy were populated using the 155 Gd (α, 2n) reaction at a beam energy of 25 MeV. The 155 Gd target was 0.98 mg/cm 2 thick with a purity of 91%. Gamma-rays following the fusion evaporation reaction were detected with the JUROGAM II multi-detector array [73] in JYFL, Jyväskylä, Finland. The spectrometer setup comprised 39 high-purity germanium detectors, all with BGO escape suppression shields; 15 EUROGAM coaxial detectors (Phase 1 [75] and GASP [74] type) and 24 EUROGAM Phase II clover detectors [76]. Approximately 14 x 10 9 γ-γ events were unfolded from the data in the off-line analysis and replayed into γ-γ Radware [77, 78] coincidence matrices, which were used to construct the level scheme of 157 Dy. The spins and parities for the new rotational structures were successfully assigned using the Directional Correlation from Oriented States (DCO ratios/RDCO) [79, 80] and linear polarization anisotropy (Ap) methods [81]. While Ap is given as used in [82], the DCO matrices were constructed using data from detectors in the rings at 158° and 86°+94°, thus the RDCO for the JUROGAM II array in this work is; RDCO = I γ1(at 158º : gated on γ2 near 90 º) / I γ1(near 90º : gated on γ2 at 158º)

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Section: Experimental Details and Analysismentioning

confidence: 99%

Section: Experimental Details and Analysismentioning

confidence: 99%

Spectroscopy of low-spin states in Dy157 : Search for evidence of enhanced octupole correlations

Majola¹,

Bark²,

Bianco³

et al. 2019

Phys. Rev. C

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“…To measure the linear polarization of gamma-rays we constructed [15] a triple Ge(Li) Compton polarimeter, similar to that described in [16]. The polarimeter sensitivity Q(E~) is shown in to those described in [17].…”

Section: Experimental Procedures and Data Analysismentioning

confidence: 99%

In-beam study of127Xe

et al. 1985

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The level structure of the 127Xe nucleus has been studied through the 125Te(e ' 2n) ~ 27Xe reaction at E~ = 27 MeV by in-beam 7-ray spectroscopic methods including three-parameter 7-7-t coincidences, angular distribution and linear polarization as well as lifetime measurements. The results supplemented current information and, in particular, established the existence of a new isomeric state having a half-life of 25 _+ 3 ns.

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“…Furthermore, the calculated polarization sensitivities of the CLOVER and CLUSTER detectors turn out to be similar. For comparison the measured polarization sensitivity of an optimized Compton Polarimeter consisting of three Ge detectors [58] is also included in Fig. 20.…”

Section: The Use Of Clover and Cluster Detectors As Compton Polarimetersmentioning

confidence: 99%

5 New Generation of Gamma-Detector Arrays

1997

Experimental Techniques in Nuclear Physics

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Construction and use of a three Ge(Li) Compton polarimeter

Cited by 98 publications

References 13 publications

Spectroscopy of low-spin states in Dy157 : Search for evidence of enhanced octupole correlations

Spectroscopy of low-spin states in Dy157 : Search for evidence of enhanced octupole correlations

In-beam study of127Xe

5 New Generation of Gamma-Detector Arrays

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