Parities of strong dipole ground state transitions in88Sr

Wienhard, K.; Bläsing, C.; Ackermann, K.; Bangert, K.; Berg, U.E.P.; Kobras, K.; Naatz, W.; Rück, D.M.; Schneider, R.; Stock, R.

doi:10.1007/bf01413049

Cited by 16 publications

(4 citation statements)

References 6 publications

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“…The values obtained for the transitions at 1836, 3486, and 4035 keV are consistent with the parities known for the respective states but are attenuated by feeding. The values deduced for the transitions at 6212, 6333, 7088, 7837, and 8040 keV are consistent with those given in previous work [17]. The asymmetries of the transitions with energies greater than 6 MeV are depicted in Fig.…”

Section: Experiments With Polarized Photonssupporting

confidence: 90%

“…III), leading to a correction factor of 1.18 (21). For transitions in the energy range between 6 and 9 MeV a possible remaining feeding of 10(5)% as deduced from the ratios I s+f (13.2)/I s+f (9.0) has also to be taken into account, which leads together with the branching ratio to an effective correction factor of 0.94 (17). h Spin and parity have been known from previous work (cf.…”

Section: Experiments At Various Electron Energiesmentioning

confidence: 99%

“…For the J = 1 states at 6212, 6333, 7089, 7838, and 8041 keV, negative parities were derived from an experiment with polarized photons [17]. For the state at 4743 keV, negative parity was determined in a measurement with a highly polarized, quasimonoenergetic photon beam [18].…”

Section: Introductionmentioning

confidence: 99%

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Dipole response ofSr88up to the neutron-separation energy

et al. 2007

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The dipole response of the magic N = 50 nucleus 88 Sr was studied in photon-scattering experiments at the electron linear accelerator ELBE with bremsstrahlung produced at kinetic electron energies of 9.0, 13.2, and 16.0 MeV. We identified 160 levels up to an excitation energy of 12 MeV. By using polarized photons linear polarizations of about 50 γ transitions were measured that enabled parity assignments to the corresponding states. In the energy range of 6-12 MeV we identified only one M1 transition; all other transitions have E1 character. Thus, E1 character was proven for 63% of the total dipole strength of the observed levels in the given energy range. Statistical methods were applied to estimate intensities of inelastic transitions and to correct the intensities of the ground-state transitions for their branching ratios. In this way we derived the photoabsorption cross section up to the neutron-separation energy. This cross section matches well the photoabsorption cross section obtained from (γ, n) data and thus provides information about the extension of the dipole-strength distribution toward energies below the neutron-separation energy. An enhancement of E1 strength at 6-11 MeV may be considered as an indication for a pygmy dipole resonance.

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Section: Experiments With Polarized Photonssupporting

confidence: 90%

Section: Experiments At Various Electron Energiesmentioning

confidence: 99%

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Dipole response ofSr88up to the neutron-separation energy

et al. 2007

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“…4. The values deduced for the transitions at 6212, 6333, 7088, 7837, and 8040 keV are consistent with those given in previous work [14]. The degree of polarisation derived as described above is also shown.…”

Section: Pos(psf07)020supporting

confidence: 90%