A study of levels in 153Eu and 155Eu by the (3He, d) reaction

Study of form factors for single-proton transfer reactions on152Sm,154Gd and156Gd

“…These parameters [8][9][10] are listed in Table 4. In a first step, the bound-proton wave function was calculated in the spherical potential U(r) = Vws(r ) + Vc(r), Table 5, together with additional parameters which are used to specify the more realistic potentials described below.…”

“…For simplicity, only those levels are listed in the tables which are used for the analysis described below. The properties of states at higher excitation energies are discussed in [8][9][10]. Selected deuteron and triton angular distributions are shown in Fig.…”

“…The (3He, d) and (cqt) cross sections measured at 25 ~ and 30 ~ , respectively, are summarized in Tables 1-3 for levels populated in 153Eu, 155Tb and lSTTb, together with their excitation energies and Nilsson interpretations. The assignments are taken from Ungrin et al [8] (153Eu), Tippett and Burke [9] and Boyno and Huizenga [10] (15STb, 157Tb), as well as a Assignments adopted from [8][9][10]13] Excitation energies taken from [13] Cross section errors are typically 5 % for strong lines and up to 50 % for weak lines a Unresolved multiplet 55" from Nuclear Data Sheets [13]. The excitation energies determined from the present experiment agree with those of [8][9][10] within their statistical uncertainties of approximately _+3keV.…”

“…For the present work, the (3He, d) and (e,t) reactions on targets of ~52Sm, 154Gd and a56Gd were selected since most of the low-lying states (Eexr MeV) excited by the proton transfer have a simple structure, i.e. Coriolis mixing is negligible [8][9][10]. The analysis presented here will be restricted to such levels at low excitation energies in order to avoid additional uncertainties due to band mixing.…”

Decay of 155Sm

“…In this work 49 γ-transition arranged in 16 energy levels were attributed to the β − decay of 155 Sm. Other studies using different nuclear reactions, such as 152 Sm(t,α) [4], 153 Eu(t,p) [5] and 154 Sm( 3 He,d) [6] confirmed some of these results and gave a more precise description of the energy levels up to 1.0MeV. Recently Genezini [7] performed angular correlation measurements for several γ cascades where some multipole mixing ratios were extracted suggesting spin and parity for some excited levels, but no additional information related to the beta decay parameters were obtained.…”