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Giannatiempo, A.; Nannini, A.; Perego, A.; Sona, P.

doi:10.1103/physrevc.44.1844

Cited by 18 publications

(12 citation statements)

References 27 publications

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“…In the works concerning 11o. 112,114Cd nuclei [7,8] it was found that the experimental value of X(2 + --+2 + ) and X(2 + -~21 + ), which are respectively ~ 1 and > 1, were in good agreement with a theoretical description of the 2 + and 2 + levels as states with quite pure symmetric character and of the 2 + level as the lowest MS state. It was also found that the sharp …”

Section: Discussionsupporting

confidence: 65%

“…They find that, on the basis of gamma decay, the 2 + level can be interpreted as the lowest MS state and show how this interpretation is supported by the analysis of the B(EO)/B(M1) and B (EO)/B(E2) ratios for the 22 + --.211 and 2 + --+2 + transitions in the three nuclei [8]. As it turns out, knowledge of the E0 component in transitions connecting 2 + states can be an important piece of information in order to distinguish between states having full-symmetry or mixedsymmetry character.…”

Section: Introductionmentioning

confidence: 86%

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Search for the lowest 2+ mixed-symmetry state in102Ru

Fazzini

Giannatiempo

Nannini

et al. 1993

Z. Physik A - Hadrons and Nuclei

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Section: Discussionsupporting

confidence: 65%

Section: Introductionmentioning

confidence: 86%

Search for the lowest 2+ mixed-symmetry state in102Ru

Fazzini

Giannatiempo

Nannini

et al. 1993

Z. Physik A - Hadrons and Nuclei

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“…Particularly important is the definite assignment of J =2+ to the 1756 keV level, which is therefore the third excited state of such a spin. We recall that in the U(5) and O(6) limit of the IBM-2 model the first mixed symmetry state is predicted to have J =2+ and that in some nuclei having a structure close to these limits the largest mixed symmetry component has been found in the 23+ level [19][20][21][22]. The 1756 keV level, which decays to the triplet 02, 22, 4, + but also to the 2, and 0+, states [5], shows properties compatible with a large mixed symmetry component [23].…”

mentioning

confidence: 88%

“…As to the22 2, + transition, from the value of uz and of the mixing ratio 8(E2/M 1) =0.5~0.1[5], it is possible to deduce the value 0.90~0.37 for the intensity ratio q =I'(EO;2z~2,+)/Itr(E2;2z -+2+, ) of the EO to E2 component of the E-conversion transition. This translates into a value 0.39~0.16 for the ratio X=B(EO;2z~2, +)/ B(E2;22~2t ).…”

mentioning

confidence: 99%

Decay properties of the02+state and spin-parity assignments inKr
Giannatiempo
¹
,
Nannini
²
,
Perego
³

et al. 1995
Phys. Rev. C
Self Cite
17
1
10
0
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The lifetime 7. of the 02 state in Kr has been measured by means of the Doppler shift attenuation method in gases. From the value of~and the measured value of the K-internal conversion branching Is(Oz~0,+)/Itt(Oz~2, +) the value of the electric monopole strength p (EO) of the 02 -+0, + transition has been deduced. Restriction or assignments for the spin parity of several levels in Kr, populated in the decay of Rb, have been deduced by measuring K-internal conversion coefficients of the relevant transitions. PACS number(s): 23.20.Nx, 21.10.Hw, 23.20.Lv, 27.50.+e As a part of a systematic investigation of the EO and E2 decay modes of 0+ excited states in even krypton isotopes, we recently reported some spectroscopic data on Kr concerning, in particular, the decay properties of the 02 state [I] In even krypton isotopes this state was interpreted by some authors [2] as belonging to the standard space of the interacting boson model in its IBM-1 version [3],while other authors [4], applying the IBM-2 model [3], interpreted it as an "intruder state, " i.e. , as lying outside the IBM model space. In Refs. [2,4] the comparison between experimental and calculated data relevant to 02 states was necessarily limited to excitation energies, due to the lack of experimental data on transition strengths from these states. In Ref. [1]we compared the available spectroscopic data on low-lying levels of Kr with the values predicted by the IBA-2 model, when a set of parameters different from that adopted in Ref.[4] is used. We found that it is still possible to give a consistent description both of excitation energies of the 02 state in these nuclei and decay properties of the 02 state in Kr, without introducing configurations lying outside the IBA-2 model space.In this paper we report on measurements in Kr concerning (i) the decay properties of the 1017 keV, Oz state, which could provide further support to the proposed description of the 02 states in Kr and (ii) the determination of several internal conversion coefficients, which enable us to assign the parity of several levels as well as to restrict the possible range of their spin values. This information is necessary for an analysis of the low-lying positive-parity levels of the even krypton isotopes (that we plan to perform in the near future) aimed at the identification of states having predominant mixed symmetry character under exchange of proton and neutron bosons [3]. The low-lying levels in Kr were populated in the P /EC decay of Rb [5] collected at the ISOLDE mass separator (CERN). The conversion electrons were analyzed by means of a compact magnetic transport system [6] coupled to a 5 cm x6 mm Si(Li) detector cooled down to the liquid nitrogen temperature. Under typical experimental conditions the energy resolution (full width at half maxi-mum) at 1 MeV was about 2 keV. Due to the large number of y rays in the decay of Rb, which generate considerable background in the silicon detector, it has been necessary to

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“…Even the concept of the coexistence of a deformed intruder configuration and comparably less-deformed "normal" phonon states with strong mixing fails to explain all the experimental observables (e.g., the energy levels as well as the B(E2) values [1][2][3][4][5][6][7]). A better description of the low-spin states at lower excitation energy has been achieved by considering the neutron-proton version of the interacting boson model (IBM-II) [8][9][10], but the enigmatic behavior of these states in the Cd nuclei still calls for more experimental and theoretical attention.…”

Section: Introductionmentioning

confidence: 99%

Investigation of phonon excitations inCd114with the(n,n'
Bandyopadhyay
¹
,
Lesher
²
,
Fransen
³

et al. 2007
Phys. Rev. C
36
3
19
0
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Properties of low-spin states in 114 Cd have been studied with the (n, n γ ) reaction. Gamma-ray angular distributions and excitation functions have been used to characterize the decays of the excited levels. Level lifetimes have been obtained with the Doppler-shift attenuation method. Sixteen new levels and many new transitions have been suggested below 3.5 MeV in excitation energy. Levels belonging to the phonon multiplets have been proposed based on their decay patterns and collectivity, and the existing intruder structure has been extended. A two-phonon 1 + ms state has been suggested. Excitation of the hexadecapole moment has been considered. Data have been compared with the theoretical calculations of the interacting boson model.

show abstract

E0 components of2i+→2f+<

Cited by 18 publications

References 27 publications

Search for the lowest 2+ mixed-symmetry state in102Ru

Search for the lowest 2+ mixed-symmetry state in102Ru

Decay properties of the02+state and spin-parity assignments inKr
Giannatiempo
¹
,
Nannini
²
,
Perego
³

et al. 1995
Phys. Rev. C
Self Cite
17
1
10
0
View full text Add to dashboard Cite

Investigation of phonon excitations inCd114with the(n,n'
Bandyopadhyay
¹
,
Lesher
²
,
Fransen
³

et al. 2007
Phys. Rev. C
36
3
19
0
View full text Add to dashboard Cite

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E0 components of2i+→2f+<

Cited by 18 publications

References 27 publications

Search for the lowest 2+ mixed-symmetry state in102Ru

Search for the lowest 2+ mixed-symmetry state in102Ru

Decay properties of the02+state and spin-parity assignments inKrGiannatiempo1, Nannini2, Perego3 et al. 1995Phys. Rev. CSelf Cite171100View full textAdd to dashboardCite

Investigation of phonon excitations inCd114with the(n,n'Bandyopadhyay1, Lesher2, Fransen3 et al. 2007Phys. Rev. C363190View full textAdd to dashboardCite

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Decay properties of the02+state and spin-parity assignments inKr
Giannatiempo
¹
,
Nannini
²
,
Perego
³

et al. 1995
Phys. Rev. C
Self Cite
17
1
10
0
View full text Add to dashboard Cite

Investigation of phonon excitations inCd114with the(n,n'
Bandyopadhyay
¹
,
Lesher
²
,
Fransen
³

et al. 2007
Phys. Rev. C
36
3
19
0
View full text Add to dashboard Cite