R. Chapman

Photo-response of the $$N=Z$$ nucleus 28Si below 13.0 MeV

M. Scheck, R. Schwengner, O. Ağar, R. Beyer et autres

Abstract The electric E1 and magnetic M1 dipole responses of the $$N=Z$$ N = Z nucleus 28Si were investigated in a nuclear resonance fluorescence experiment at the ELBE accelerator of the Helmholtz Zentrum Dresden-Rossendorf. The investigated energy range extends to 13.0 MeV, …

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High-spin states of 68 165 , 166 , 167 Er populated in incomplete fusion reactions

R. Chapman, M. Labiche, J. Ollier, V. Kumar et autres

High-spin states in the 68 165 , 166 , 167 Er nuclei were populated in the incomplete fusion of 55-MeV Li 7 ions with a Dy 164 target. Previously known rotational sequences in Er 165 , 166 , 167 have been extended, …

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Seniority-two valence-shell building blocks of the octupole phonon

M. Scheck, R. Chapman, K.R. Mashtakov, R.P. Meeten et autres

Abstract The relative ordering of J − levels of multiplets resulting from two-body excitations, which include a J π = 3− state that can contribute to the octupole phonon, are investigated in a simplistic shell-model approach. To calculate the relative level ordering, …

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Seniority-two valence-shell building blocks of the octupole phonon

M. Scheck, R. Chapman, K.R. Mashtakov, R.P. Meeten et autres

The relative ordering of $J^-$ levels of multiplets resulting from two-body excitations, which include a $J^π=3^-$ state that can contribute to the octupole phonon, are investigated in a simplistic shell-model approach. To calculate the relative level ordering, harmonic oscillator wavefunctions and a …

Candidates for low-lying octupole isovector (mixed-symmetry) excitations

M. Scheck, E. Gregor, M. Thürauf, Ch. Stoyanov et autres

The spectroscopic properties of low-lying octupole states, previously proposed to be candidates for isovector (mixed-symmetry) states, were investigated in 95Mo(nth, γ) and 143Nd(nth, γ) thermal neutron capture reactions. The experiments used eight Clover detectors that made up the central ring of the …

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Spectroscopic study of Mo 97 , Mo 99 , and Mo 101

В. Кумар, R. Chapman, J. Ollier, R. Orlandi et autres

Excited states of the molybdenum isotopes Mo 42 97 , 99 , 101 have been populated in two experiments which used fusion-fission and binary grazing reactions to populate yrast states of the nuclei of interest. In the first experiment, the GASP array …

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Evolution of nuclear structure in the neutron-rich Nb96,97,99 isotopes: Evidence for shape coexistence in N=58Nb99

В. Кумар, R. Chapman, D. O’Donnell, J. Ollier et autres

Excited states of the neutron-rich niobium isotopes $_{\phantom{96,97,98,}41}^{96,97,98,99}\mathrm{Nb}$ have been populated in two experiments which used fusion-fission and multinucleon binary grazing reactions to populate high-spin yrast states. In the multinucleon-transfer experiment, a 530-MeV beam of $^{96}\mathrm{Zr}$ ions was incident on a thin …

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Photo-response of the $$N=Z$$ nucleus $$^{24}$$Mg

J. Deary, M. Scheck, R. Schwengner, D. O’Donnell et autres

Abstract The electricE1 and magneticM1 dipole responses of the $$N=Z$$ N=Z nucleus $$^{24}$$ 24 Mg were investigated in an inelastic photon scattering experiment. The 13.0 MeV electrons, which were used to produce the unpolarised bremsstrahlung in the entrance channel of the $$^{24}$$ …

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Band Termination Spectroscopy in Er-157

S.J. Gale, J. Simpson, M. A. Riley, J.F. Sharpey-Schafer et autres

The level scheme of 157Er has been extended from a spin region where the nucleus behaves as a prolate rotor to a region where the spin is produced by the alignment of all or most of the available valence nucleons along the …

Rotational sequences in N=98 Tm167 populated in the Dy164(Li7,4nγ)Tm167 fusion-evaporation reaction

Michael J. Burns, R. Chapman, K. Spohr, J. Ollier et autres

High spin states in $_{69}^{167}\mathrm{Tm}_{98}$ were studied using the $^{164}\mathrm{Dy}(^{7}\mathrm{Li},4n\ensuremath{\gamma})^{167}\mathrm{Tm}$ fusion-evaporation reaction. The XTU Tandem accelerator at the INFN Legnaro National Laboratory was used to accelerate a beam of $^{7}\mathrm{Li}$ ions to 55 MeV, and $\ensuremath{\gamma}$ rays from the evaporation residues were …

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Lifetime measurements of states of S 35 , S 36 , S 37 , and S 38 using the AGATA γ -ray tracking spectrometer

L. Grocutt, R. Chapman, M. Bouhelal, F. Haas et autres

Lifetimes or lifetime limits of a small number of excited states of the sulfur isotopes with mass numbers $A=35$, 36, 37, and 38 have been measured using the differential recoil-distance method. The isotopes of sulfur were populated in binary grazing reactions initiated …

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Single-particle states and parity doublets in odd- Z Ac221 and Pa225 from α -decay spectroscopy

E. Parr, J. F. Smith, P. T. Greenlees, P. A. Butler et autres

Low-lying states in the odd-$Z$ isotopes $_{\phantom{\rule{3.33333pt}{0ex}}89}^{221}\mathrm{Ac}_{132}$ and $_{\phantom{\rule{3.33333pt}{0ex}}91}^{225}\mathrm{Pa}_{134}$ have been studied using $\ensuremath{\alpha}$-particle and $\ensuremath{\alpha}\ensuremath{\gamma}$-coincidence spectroscopy in the $^{225}\mathrm{Pa}\ensuremath{\rightarrow}^{221}\mathrm{Ac}\ensuremath{\rightarrow}^{217}\mathrm{Fr}$ decay chain. Ground-state spin and parity assignments of ${I}^{\ensuremath{\pi}}$ = ${5/2}^{\ensuremath{-}}$ are proposed for both $^{221}\mathrm{Ac}$ and $^{225}\mathrm{Pa}$, with the odd proton …

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