New isomers and their decay in odd-odd neutron-deficient cesium isotopes

Weiss, B.; Liang, C. F.; Paris, P.; Péghaire, A.; Gizon, A.

doi:10.1007/bf01417225

Cited by 24 publications

(15 citation statements)

References 30 publications

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“…5. Nevertheless, as the 58.2 and 53.85 keV transitions can support the same multipolarities as those deduced in the 114Cs decay scheme, and as the present [4]. 5.…”

Section: The 12*ba Decay Schemesupporting

confidence: 90%

“…Due to the errors in these intensities, calculated estimations of 1% and less may have errors of the same order of magnitude as the number given. The first three excited levels at 169.5, 189.0 and 211.6 keV respectively are easily and firmly based on the results of the coincidence experiments and they confirm the lower energy states already proposed from radioactivity measurements [8,9,7] or from the 124"mCS (T1/2=6.3 s) isomer decay [4,7]. 5.…”

Section: The 12*ba Decay Schemesupporting

confidence: 84%

“…In these measurements, the 124Ba activities were poor; indeed, the recoiling nuclei of this isotope were produced in a 4 mg.cm -2 target via the 116Sn (12C, 4n) reaction and collected on a 10 gm aluminium catcher placed just behind the tin foil during the beam bombardment. It is important to underline that such a normalization reproduces quite well the conversion coefficients of the 189.0 and 211.6 keV transitions, previously studied from the 6.3 s i24mCs [4], The experimental conversion coefficients and K/L ratios have been compared with the theoretical values [14] and the multipolarity of each gamma transition has been deduced. Due to both stronger ~24Ba activites of our mass-separated samples and better performances of the new Ge detectors, the present measurements are more complete; nevertheless, for the main lines, the agreement with previous partial data is quite good.…”

Section: Resultsmentioning

confidence: 61%

“…For example, it is the case of gamma lines at 353.99-369.0-380.4-388.2-401.6-781-864.0 and 1,131.9 keV which have been labelled in Table 1. Due to the large number of low-energy transitions involved, more or less converted, the electron spectra associated to the various magnetic fields remain complex compared to those previously analyzed in the a24mCs ~ 124Cs decay [4]. In these measurements, the 124Ba activities were poor; indeed, the recoiling nuclei of this isotope were produced in a 4 mg.cm -2 target via the 116Sn (12C, 4n) reaction and collected on a 10 gm aluminium catcher placed just behind the tin foil during the beam bombardment.…”

Section: Resultsmentioning

confidence: 99%

“…The Isocele 2 facility, including the on-line separator, the moving tape collector, the Ge detectors, the magnetic electron selector and the data collection system used for these experiments was already employed in our studies of cesium isomers and has been described in several papers [4,6,11]. The activity was produced by bombardment of cerium or lanthanum targets with 280 MeV 3He or 200 MeV proton beams delivered by the Orsay synchrocyclotron.…”

Section: Experimental Set-upmentioning

confidence: 99%

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124Ba Decay to the 55 124 Cs69 low-spin levels

Weiss¹,

Gizon

Liang

et al. 1986

Z. Physik A - Atomic Nuclei

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The decay of 124Ba to the levels of odd-odd 124Cs has been studied with on-line massseparated sources delivered at the Isocele facility. The energy level scheme has been established from y-ray singles, y-7-t coincidence and e-y -t coincidence spectra. Spin and parity of several low-lying levels have been assigned on the basis of internal conversion coefficient measurements and fl-branchings. A completely new level pattern including approximately 50 levels and 180 y-rays is proposed for 124Cs. Several features of this level scheme are discussed and compared to those of neighbouring isotopes.

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“…5. Nevertheless, as the 58.2 and 53.85 keV transitions can support the same multipolarities as those deduced in the 114Cs decay scheme, and as the present [4]. 5.…”

Section: The 12*ba Decay Schemesupporting

confidence: 90%

Section: The 12*ba Decay Schemesupporting

confidence: 84%

Section: Resultsmentioning

confidence: 61%

Section: Resultsmentioning

confidence: 99%

Section: Experimental Set-upmentioning

confidence: 99%

See 3 more Smart Citations

124Ba Decay to the 55 124 Cs69 low-spin levels

Weiss¹,

Gizon

Liang

et al. 1986

Z. Physik A - Atomic Nuclei

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Electron-capture branching ratio measurements of odd-odd intermediate nuclei in double-beta decay at the TITAN facility

Lennarz¹,

Brunner²,

Andreoiu³

et al. 2013

ISAC and ARIEL: The TRIUMF Radioactive Beam Facilities and the Scientific Program

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Rotational bands in doubly-odd124Cs and residual proton-neutron interaction

Gizon

Barci

El-Samman

et al. 1990

Z. Physik A - Atomic Nuclei

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: For the first time, collective bands have been observed in the doubly-odd nucleus 124Cs. They are proposed to result in the coupling of an hll/2 proton to h11/2 and positive parity neutrons. The relative residual protonneutron interaction in 124Cs is calculated and compared to that of neighbouring odd-odd nuclei.The knowledge of doubly-odd nuclei in the Xe-Ce transitional region is limited, especially that of the light ones. However there are data, for example those recent for 128,130La [1] and 126La [2], which show that two quasiparticle collective bands excited in heavy-ion induced reactions are generated by the coupling of h11/2 proton to hl 1/2 and g7/2 (and/or d5/2) neutrons. This region is well suited to study the interplay between the neutron and the proton which are situated in the same shell and produce opposite y-driving effects. The study of odd-odd nuclei can bring new information relative to their coupling and in particular how these opposite "?-driving forces compensate each other. We present data for two collective bands observed in 124Cs. Preliminary results have already been reported [3].Many low-energy low-spin states are already known in 124Cs from previous measurements. Their energies, spins and parities have been determined by studying the decay of on -line mass separated samples of 124mCs [4] and 124Ba [5]. Two isomers (7 +, T1/2 = 6.3 s and 4-, T1/2 = 69 ns) have been identified.The experiments were performed at the heavy-ion SARA accelerator at Grenoble by using the ll5In(12C, 3n) reaction at 56 MeV beam energy. The y-rays were detected by one planar Ge detector and two coaxial detectors. Coincidence data were recorded in a conventional 4-parameter mode (ET1, E72, ty1 -RF, tT1 -ty2). Angular distributions have been measured at 4 angles.Two groups of levels corresponding to two different collective excitations are discussed. They are characterized by sets of M1 transitions and E2 cross-overs and different energy splittings as shown in Fig. 1. The energies of the M1 transitions are such that the separation between both signature branches is about 4 or 5 times larger for band 1 than for band 2. This situation for 124Cs is comparable to that observed for its isotone 126La [2]. The two bands presented in Fig. 2 have very likely the same configurations as those proposed for the doubly-odd nuclei 126-130La. As for the other odd-odd nuclei in this mass region, bandhead spin and parity of these two collective bands in 124Cs are unknown so far. The parities indicated in Fig.2 are deduced from the products of the parities of the single particle orbitals and the spins are only tentative. However, because of the combinations of the Routhians of the single particles considered, we can be confident of their even and odd character i.e. the lowest levels in bands 1 and 2 have even and odd spin, respectively. The Gallagher-Moskowski coupling rules predict quantum numbers K = 4 and 3 for the :~hll/2 | Vhll/2 and ~hll]2 | v(~ = +) configurations. The two bands are not positioned in the level scheme...

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New isomers and their decay in odd-odd neutron-deficient cesium isotopes

Cited by 24 publications

References 30 publications

124Ba Decay to the 55 124 Cs69 low-spin levels

124Ba Decay to the 55 124 Cs69 low-spin levels

Electron-capture branching ratio measurements of odd-odd intermediate nuclei in double-beta decay at the TITAN facility

Rotational bands in doubly-odd124Cs and residual proton-neutron interaction

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