Identification of a 3.2?s isomer in76Rb

Hofmann, S.; Zychor, I.; Heßberger, F. P.; Münzenberg, G.

doi:10.1007/bf01294240

Cited by 5 publications

(9 citation statements)

References 35 publications

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“…The bandhead is the 4(+) 317 keV, isomeric (3.2 ps) state identified by Hof-' mann et al [8]. DCO ratios could be deduced for most of the E2 transitions as well as for the first seven Ml transitions.…”

Section: Introductionmentioning

confidence: 68%

“…This observation agrees with the suggestion of Hofmann et at. [8] who concluded, from the strongly reduced transition probability (3 x 10 W.u. ) of the 71 keV transition, that these bands possess different core particle structures possibly connected with shape coexistence.…”

Section: Discussionmentioning

confidence: 99%

“…Some information concerning this nucleus at low excitation energy was already known: The ground state spin 1( ) had been determined by P radiation detected optical pumping (P-RADOP) [5] and conventional P-decay studies [6,7]. Hofmann et al [8] had identified a 3.2 tjs isomer to which they assigned I = (4+) Rom a comparison with the neighboring ' Br nuclei. In a first high-spin study Garcia Bermudez et al [9] established three strongly coupled rotational bands, reaching up to excitation energies E -2 MeV and spins I = 7~) and (10+).…”

Section: Introductionmentioning

confidence: 99%

“…Apart &om the 104 keV transition &om the lowest level no connection with the positive parity band 1 was found. The bandhead spin was deduced &om the DCO ratio of the 104 keV transition, which connects the bandhead with the 4(+), 317 keV isomeric state [8], and from systematics:…”

Section: Introductionmentioning

confidence: 99%

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Rotational bands inRb76

et al. 1995

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High spin states in Rb were investigated via the reaction Ca( Ca, 3pn) Rb at 128 MeV. The level scheme was established from pp, gpss and recoil-p coincidences measured in the EUROGAM I array in combination with the Daresbury recoil separator. The known rotational bands were extended up to the excitation energy E = 9.2 MeV and spins I = (21+) and (19 ). The band head energies could be fixed by many interband transitions. Two new bands were identified. The level scheme is discussed in terms of the cranked shell model. In the negative parity bands Rb behaves like a rigid rotor until the first band crossings.PACS number(s): 21.10. Re, 23.20.Lv, 21.60.Ev, 27.50.+e

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Section: Introductionmentioning

confidence: 68%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Rotational bands inRb76

et al. 1995

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“…[21]. Decays from previously reported isomers in 76 Rb [22], 80 Y, and 84 Nb [23] were identified, providing a validation of the experimental method and reference points for the particle identification spectra.…”

Section: (Received 10 June 1998)mentioning

confidence: 78%

Observation of Fermi Superallowedβ+Decays in Heavy Odd-Odd,N=ZNuclei: Evidence fo

Longour¹,

Narro²,

Blank³

et al. 1998

Phys. Rev. Lett.

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The b 1 -decay half-lives of the neutron-deficient, odd-odd, N Z nuclei 74 Rb, 78 Y, 82 Nb, and 86 Tc have been measured following the fragmentation of a primary 92 Mo beam at an energy of 60 MeV per nucleon. The half-lives were measured by correlating b 1 decays with the implantation of unambigously identified fragments. The deduced log ft values are consistent with 0 1 ! 0 1 Fermi superallowed transitions, which together with the measured b 1 detection efficiencies suggest T 1, I p 0 1 ground states for these odd-odd, N Z nuclei. These data represent the heaviest N Z systems for which Fermi superallowed decays have been established. The results suggest that these nuclei can extend the mass range used to test the conserved vector current hypothesis of the standard model. [S0031-9007(98)07389-X] PACS numbers: 23.40.Hc, 21.10.Hw, 21.10.Tg, 27.50. + eThe decay half-life of a nucleus is one of the most fundamental properties of a radioactive species. Since the value of the half-life depends on the initial and the final nuclear state wave functions as well as the interaction which mediates the decay, its value can be used to infer information on the structural properties of these states, such as spin and parity. This is of particular interest for heavy nuclei with equal proton and neutron numbers, the proximity of which to the proton drip line makes the determination of such unambiguous spectroscopic information experimentally challenging. Fundamental aspects of the weak interaction can also be tested with basic ingredients such as half-lives and b 1 -decay energies. For example, Hardy et al.[1] used the superallowed 0 1 ! 0 1 decay of nuclei from 14 O up to 54 Co to test the standard model via the conserved vector current (CVC) hypothesis. For these studies, the extracted ft values must be corrected for radiative and Coulomb effects [2][3][4][5] leading to the nucleus independent Ft value. This one is connected to the mixing amplitude between the up and down quarks, which is the dominant term of the unitarity relation in the Cabibbo-Kobayashi-Maskawa (CKM) matrix. Although various theoretical approaches for these corrections are generally in good agreement with each other for nuclei where experimental data are available, the unitarity relation in the CKM matrix is not yet established. For heavier nuclei, where the corrections become more important, there are considerable differences between the predictions, and measurements would provide a sensitive probe for the correctness of these theoretical estimates. A further question is whether the corrected Ft values have an elemental (Z) dependence [1,3,6]. To a large extent, these questions can be addressed by precisely measuring ft values for Fermi superallowed b decays over an extended mass region.The study of odd-odd nuclei with equal numbers of protons and neutrons also provides a unique laboratory for the study of pairing correlations and isospin symmetry in nuclear systems [7][8][9][10]. Charge independence suggests that for nuclei along the N Z line, protons and ne...

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Evidence for shape coexistence at medium spin in 76Rb

Wadsworth

Ragnarsson²,

Carlsson³

et al. 2011

Physics Letters B

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Four previously known rotational bands in 76 Rb have been extended to moderate spins using the Gammasphere and Microball γ ray and charged particle detector arrays and the 40 Ca( 40 Ca,3pn) reaction at a beam energy of 165 MeV. The properties of two of the negative-parity bands can only readily be interpreted in terms of the highly successful Cranked Nilsson-Strutinsky model calculations if they have the same configuration in terms of the number of g 9/2 particles, but they result from different nuclear shapes (one near-oblate and the other near-prolate). These data appear to constitute a unique example of shape co-existing structures at medium spins.

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Identification of a 3.2?s isomer in76Rb

Cited by 5 publications

References 35 publications

Rotational bands inRb76

Rotational bands inRb76

Observation of Fermi Superallowedβ+Decays in Heavy Odd-Odd,N=ZNuclei: Evidence fo

Evidence for shape coexistence at medium spin in 76Rb

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