The collective structure of106,108Ru

Stachel, J.; Kaffrell, Ν.; Trautmann, Ν.; Bróden, K.; Skarnemark, Gunnar; Eriksen, Dag Øistein

doi:10.1007/bf01415667

Cited by 43 publications

(20 citation statements)

References 34 publications

(47 reference statements)

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“…The first transition is from spherical vibrators to triaxial γ-soft nuclei (around A ∼ 104-110) [1][2][3][4][5][6], with increasing rigidity when going towards more neutron-rich species [6][7][8][9]. The exact location of the second shape transition, from triaxial prolate to triaxial oblate [10], is diffia e-mail: juho.j-a.rissanen@jyu.fi b Present address: Turku PET Centre, Accelerator Laboratory,Åbo Akademi University, FI-20500 Turku, Finland.…”

Section: Introductionmentioning

confidence: 99%

Penning-trap-assisted study of 115Ru beta decay

et al. 2011

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Abstract. The beta decay of115 Ru has been studied by means of Penning-trap-assisted beta and gamma spectroscopy at the IGISOL facility. The level scheme of 115 Rh has been substantially extended and compared with the level systematics of lighter rhodium isotopes. Tentative candidates for three states of the deformed K = 1/2 band have been suggested. The beta-strength distribution of the beta decay of 115 Ru differs from the beta decays of 111,113,113m Ru isotopes due to non-observation of the 3-quasiparticle states in 115 Rh. The decay properties of 115 Ru indicate a spin-parity of (3/2 + ) for its beta-decaying ground state. In addition, possible Nilsson states as well as the shape and spin transitions in odd neutron-rich ruthenium isotopes are discussed.

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Section: Introductionmentioning

confidence: 99%

Penning-trap-assisted study of 115Ru beta decay

et al. 2011

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“…A detailed decay scheme of this nucleus has been published by Stachel et al [12]; it contains 49 7-transitions, which depopulate 20 levels with energies between 242 keV and 3098 keV. Most of these transitions have also been observed in the /?7-matrix of the present experiment.…”

Section: ~ 431 C65mentioning

confidence: 68%

“…?-matrix and could be assigned to the decay of 1~ according to the endpoint energy of the coincident /?-spectrum. Only the results for those y-transitions, however, which had been placed in the decay scheme of [12], are included in Table 1 and are used for the calculation of the total decay energy of this nucleus, cf. Table 2.…”

Section: ~ 431 C65mentioning

confidence: 99%

Experimental Beta-decay energies of very neutron-rich fission products with 107?A?109

Graefenstedt

Jürgens

Keyser

et al. 1989

Z. Physik A - Atomic Nuclei

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The//-decay of neutron-rich fission products with mass numbers A = 107, 108 and 109 has been investigated at the mass separator LOHENGRIN of the Institute Laue-Langevin (ILL) in Grenoble by measuring //7-coincidences with a large plastic scintillator telescope and a Ge(I)-detector. The //-decay energies of 8 nuclei were obtained from the evaluation of more than 40//-endpoint energies. For the nuclei lo7 Mo, 1~ l~ 1~ and I~ the fl-decay energies were determined for the first time; the experimental error in the decay energy of three daughter nuclei was considerably reduced, tn addition, the two-neutron separation energies and the nuclear mass excesses were calculated from these experimental Qp-values and compared with different mass predictions.

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“…The latter seems to belong to an isotope with a shorter half-life than that of 1~ but its origin could not be identified unambiguously in the present work. Collective properties of the isotopes l~176176 (see Table 2) were deduced from the lifetimes of their 2 + states, taking into account previously reported 7-asymmetry parameters of about 240 [3][4][5]. The centroid shifts for the relevant 2 + ~ 0 + transitions and some other ones in the same energy range are shown in Fig.…”

Section: 30(2) [9]mentioning

confidence: 99%

“…Evidence for triaxiality of even-even Ru isotopes has been presented in [2][3][4][5], and lifetimes of some of their 2 + states have been measured in fission studies [6][7][8][9]. It seems, however, that in these experiments the nearly identical energies of the 2 + ---* 0 + transitions in l~ and 11~ could not be separated.…”

mentioning

confidence: 96%

Level lifetimes in neutron-rich Ru isotopes

Schoedder

Lhersonneau

Wöhr³

et al. 1995

Z. Physik A - Hadrons and Nuclei

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The neutron-rich Ru isotopes are situated between the strongly deformed Sr-Zr region with axial deformation of fl_ 0.40 [1] and the spherical Cd-Sn region. Evidence for triaxiality of even-even Ru isotopes has been presented in [2][3][4][5], and lifetimes of some of their 2 + states have been measured in fission studies [6][7][8][9]. It seems, however, that in these experiments the nearly identical energies of the 2 + ---* 0 + transitions in l~ and 11~ could not be separated. Therefore, high-resolution measurements are required in order to perceive the evolution of deformation with increasing neutron number. So far only few measurements by the delayed-coincidence method [10] have been performed on chemically or massseparated isotopes. Therefore, a systematic study of level lifetimes in neutron-rich Ru nuclei has been undertaken at the Mainz TRIGA reactor.Fission products were obtained from thermal-neutron induced fission of 249Cf. Technetium isotopes were chemically separated within 2 s by the on-line SISAK method [11], allowing the study of levels and lifetimes of their/3-decay daughters. Primarily, the short-lived activities of 1~ to 111Tc were measured, whereas long-lived decay products were kept at a low level due to the continuous flow of the liquid phase (containing the technetium activity) passing the detectors. Apart from Tc, also small contaminations of short-lived Ag isotopes were observed in the 7-spectra.The detector setup consisted of a thin plastic scintillator for fi-particles and two Ge-detectors for 7-rays, one being a planar diode with good energy resolution and timing properties (7 ns at 100 keV) and the other a medium-size coaxial detector. Coincidence events from all detector pairs were recorded with the GOOSY multiparameter system. The delayed coincidences between the fl-scintillator and the planar 7-detector were used for the measurement of the shortest lifetimes. With this setup, a systematical accuracy of the order of 0.05ns could be obtained for the strongest "/-peaks. The 7-7 coincidences were used to check for contaminations in the 7-gates from the planar detector applied for the fl-

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The collective structure of106,108Ru

Cited by 43 publications

References 34 publications

Penning-trap-assisted study of 115Ru beta decay

Penning-trap-assisted study of 115Ru beta decay

Experimental Beta-decay energies of very neutron-rich fission products with 107?A?109

Level lifetimes in neutron-rich Ru isotopes

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