Influence of neutron-core excitations on high-spin states in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>88</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:math>

Stefanova, E. A.; Schwengner, R.; Reif, J.; Schnare, H.; Dönau, F.; Wilhelm, Michael; Fitzler, A.; Kasemann, S.; Brentano, P. von; Andrejtscheff, W.

doi:10.1103/physrevc.62.054314

Cited by 39 publications

(34 citation statements)

References 35 publications

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“…The states lying in the region from 2.2 to 4.2 MeV arise from the coupling of the 0g 9/2 proton to the lowest 2 + and 3 − collective one-phonon states in the Z = 38 core 88 Sr [20] except for the 3/2 − and 5/2 − levels originating from the coupling of the p 1/2 hole ground-state configuration to the first excited 2 + state in the Z = 40 neighbor 90 Zr [21]. In spherical even-even nuclei near the shell closure, two-phonon states may result from the coupling of the quadrupole 2 + vibration to an octupole 3 − excitation [22], forming a quintuplet of states with 1 − J π 5 − .…”

Section: Introductionmentioning

confidence: 99%

Dipole strength inY89up to the neutron-separation energy

et al. 2009

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Photoexcitation of the N = 50 nucleus 89 Y has been performed at the bremsstrahlung facility at the superconducting electron accelerator ELBE at electron energies of E kin e = 9.5 and 13.2 MeV. About 250 levels up to the neutron-separation energy were identified. Statistical methods were applied to estimate intensities of inelastic transitions and to correct the intensities of the ground-state transitions for their branching ratios. The photoabsorption cross section derived in this way up to the neutron-separation energy is combined with the photoabsorption cross section obtained from (γ, n) data and provides information about the extension of the giant dipole resonance toward energies below the neutron-separation energy. An enhancement of E1 strength has been found in the range from about 6 to 11 MeV. The experimental photoabsorption cross sections of 89 Y and of the neighboring N = 50 isotones 88 Sr and 90 Zr are compared with predictions of the quasiparticle-random-phase approximation.

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Section: Introductionmentioning

confidence: 99%

Dipole strength inY89up to the neutron-separation energy

et al. 2009

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“…By examining the strong γ rays with known multipolarities in 88 Sr [7], which were also produced in the present experiment, the ADO ratios for stretched quadrupole or I = 0 dipole radiations and stretched pure dipole transitions are found to be ∼1.3 and ∼0.7, respectively. The ADO ratios of most γ rays in 88 Y are shown in Fig.…”

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confidence: 56%

“…Only two-body interactions were taken into account since a complex matrix element can be decomposed into a combination of two-body matrix elements. The single particle energies and the residual interaction strength were extracted from the neighboring nuclei [7,[10][11][12][13][14][15][16][17][18]. The calculated level energies are listed in Table I, together with the corresponding configurations of the levels.…”

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confidence: 99%

High-spin states in near-spherical88Y

Wang

Niu

et al. 2012

Phys. Rev. C

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High-spin states in doubly odd 88 Y have been investigated using the 82 Se( 11 B, 5n) reaction at beam energies of 48 and 52 MeV. On the basis of the γ -γ coincidence relationships, the level scheme of 88 Y has been extended up to an excitation energy of 9.5 MeV at spin 21h. About 20 new levels and 30 new transitions have been added into the level scheme, and spin-parity assignments have been made to most of the newly proposed levels. In order to better understand the nuclear structure of 88 Y, semiempirical shell-model calculations were carried out considering a valence space formed by the proton 1p 1/2 , 1p 3/2 , 0f 5/2 , 0g 9/2 and neutron 0g 9/2 orbitals.

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“…Since a complete set of empirical effective interactions for this model space is not available up to now, various empirical interactions have been combined with results of schematic nuclear interactions applying the surface ␦ interaction. Details of this procedure are described in our previous shellmodel studies of nuclei with N =48 [13,14], N =49 [15,16], N =50 [15,17,18,1,2], N =51,52 [19], and N =53,54 [20].…”

Section: The Shell-model Calculations Sm-iimentioning

confidence: 99%

Transition strengths between particle hole excitations inRu95

et al. 2004

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High-spin states of 95 Ru have been populated using the 35 Cl+ 64 Zn reaction at a beam energy of 135 MeV. In a recoil-distance Doppler-shift experiment, the lifetimes or lifetime limits of 26 high-spin states have been measured, giving information on a total of 49 reduced transition strengths. The results are compared with shell-model calculations with different model spaces and residual interactions. Several families of states with defined proton and neutron seniorities are proposed. The M1 strengths in the negative-parity yrast sequence show a pronounced staggering which is reproduced by the shell-model calculations.High-spin states in 95 Ru were populated using the 64 Zn͑ 35 Cl, 3pn͒ 95 Ru reaction at a beam energy of 135 MeV. The 1.0-mg/ cm 2 -thick 64 Zn foil (enriched to 99.8%) was bombarded with the ϳ1 particle-nA 35 Cl beam provided by the XTU tandem accelerator of the INFN at Legnaro, Italy. The target was mounted in the Cologne plunger apparatus parallel to a 7-m-thick stretched Au-stopper foil. Data were taken for 13 target-stopper distances between x =20 m and 6117 m. The ␥ radiation was detected using the GASP 4 Ge detector array with six neutron detectors placed in for-*Present address:

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Influence of neutron-core excitations on high-spin states in88Sr

Cited by 39 publications

References 35 publications

Dipole strength inY89up to the neutron-separation energy

Dipole strength inY89up to the neutron-separation energy

High-spin states in near-spherical88Y

Transition strengths between particle hole excitations inRu95

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