A γ-ray detector array for joint spectroscopy experiments at the JAERI tandem–booster facility

Furuno, K.; Oshima, M.; Komatsubara, T.; Furutaka, Kazuyoshi; Hayakawa, Tomokatsu; Kidera, M.; Hatsukawa, Y.; Matsuda, M.; Mitarai, S.; Shizuma, T.; Saitoh, Tadashi; Hashimoto, N.; Kusakari, H.; Sugawara, M.; Morikawa, T.

doi:10.1016/s0168-9002(98)00935-8

Cited by 69 publications

(14 citation statements)

References 29 publications

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“…The target was an enriched self-supporting 124 Sn metallic foil with a thickness of 4 mg/cm 2 . A γ -ray detector array [18] consisting of one planar detector and nine BGO-Compton-suppressed high-purity germanium (Ge) detectors was used to measure the in-beam γ rays. Five Ge detectors were positioned at 37 • and the others near 90 • with respect to the beam direction.…”

Section: Introductionmentioning

confidence: 99%

High-spin states in127I

et al. 2012

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In-beam γ spectroscopy of the stable nucleus 127 I has been studied experimentally using the 124 Sn( 7 Li, 4nγ ) 127 I reaction at a beam energy of 32 MeV. The high-spin level scheme of 127 I is extended significantly. Negative-parity levels built on the 11/2 − , πh 11/2 particle state are observed up to (35/2 − ) and described as a decoupled band, extending our knowledge of decoupled structures to the most neutron-rich stable iodine isotope. Two I = 2 yrast positive-parity sequences are proposed to be associated with the πg 7/2 configuration due to observations of several strong interband transitions, and two weakly populated I = 2 positive-parity bands are newly identified and interpreted as arising mainly from the πd 5/2 configuration. Three-quasiparticle configurations are assigned to the I π = 15/2 + and 23/2 + states according to the existing knowledge in neighboring nuclei; irregular noncollective and regular collective excitations built on these two (15/2 + and 23/2 + ) states are observed to coexist at similar energies. The observed three-quasiparticle band structures are further interpreted with the aid of configuration-constrained potential energy surface calculations.

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Section: Introductionmentioning

confidence: 99%

High-spin states in127I

et al. 2012

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“…The target was an isotopically enriched 173 Yb metallic foil of 2.0 mg/cm 2 thick with a 7.0 mg/cm 2 Pb backing. The GEMINI [11] γ-ray detector array was used. At the time of this experiment, an array consisting of thirteen HPGe's with BGO anti-Compton(AC) shields was used; six detectors had an efficiency of 40% each and the others had 70% relative to 3″×3″ NaI.…”

Section: Experiments and Resultsmentioning

confidence: 99%

High-spin structure in 187Pt

Xing

Zhou

Zhang

et al. 2008

Sci. China Ser. G-Phys. Mech. Astron.

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High-spin states in187 Pt were studied via the 173 Yb( 18 O, 4n) reaction. Rotational bands based on the νi 13/2 , ν7/2 − [503], νi 2 13/2 νj, ν3/2 − [512] and ν1/2 − [521] configurations were observed, and interpreted within the framework of the cranked shell model. The TRS calculations show that the νi 13/2 band has an appreciable negative γ deformation, and the negative-parity bands tend to have a near prolate shape with small positive γ values. Experimental values of B(M1)/B(E2) ratios have been extracted and compared with theoretical values from the semi-classical Dönau and Frauendof approach, strongly suggesting a low frequency πh 9/2 alignment in the ν7/2 − [503] band. rotational band, configuration, shape coexistenceThe neutron-deficient Pt-Hg nuclei are well known for exhibiting the shape coexistence phenomenon [1,2] . Different structures associated with prolate, oblate, and triaxial shapes within the same nucleus have been identified experimentally [1,2] , and the ground-state shape transitions for the isotopic chains have been observed [3][4][5] . The isotope shift measurements have shown a sharp change of the nuclear charge radius between 188 Pt and 186 Pt [3][4][5] , suggesting a ground-state shape transition from the near oblate shape for the Pt nuclei with A≥188 to the prolate shape for A≤186. Therefore, the spectroscopic information of 187 Pt is of particular interest as it lies between the two nuclei 186 Pt and 188 Pt where the change in the collective structure should be the most drastic. One expects that rotational bands with different shapes should coexist in 187 Pt. Due to the pronounced transitional characteristic, the nucleus 187 Pt would be rather soft with respect to β and γ deformations, and the shape-polarizing effects arising from valence nucleons and aligned quasi-particles

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“…The target was an enriched selfsupporting 124 Sn metallic foil with a thickness of 4 mg/cm 2 . A γ -ray detector array [25] consisting of one planar detector and nine BGO-Compton-suppressed Ge detectors was used to measure the in-beam γ rays. Five Ge detectors were positioned at 37 • and the others near 90 • with respect to the beam direction.…”

Section: A Measurementsmentioning

confidence: 99%

High-spin level scheme of doubly odd128I

et al. 2012

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High-spin states in the odd-odd 128 I have been studied experimentally using the 124 Sn( 7 Li, 3nγ ) 128 I reaction at beam energies of 28 and 32 MeV. A level scheme built on the known T 1/2 = 175 ns, (6 − ) isomer has been established. The low-lying states in the level scheme have been proposed to be associated with the πd 5/2 ⊗ νh 11/2 and πg 7/2 ⊗ νh 11/2 two-quasiparticle excitations. The strongly populated negative-parity states, forming a bandlike structure, have been assigned to be based on the πg 7/2 ⊗ νh 11/2 configuration. The πh 11/2 ⊗ νh 11/2 multiplet 9 + , 10 + , and 11 + members have been identified according to the systematics of the corresponding level structures observed in the lighter odd-odd iodine isotopes. The two-quasiparticle configuration assignments are supported by the nucleon pair approximation and empirical shell-model calculations.

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A γ-ray detector array for joint spectroscopy experiments at the JAERI tandem–booster facility

Cited by 69 publications

References 29 publications

High-spin states in127I

High-spin states in127I

High-spin structure in 187Pt

High-spin level scheme of doubly odd128I

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