Investigation of discrete states and quasidiscrete structures observed in Sm150 and Sm152 using the

Abstract

New levels and γ-ray transitions were identified in 150,152 Sm utilizing the (p,t) reaction and particle-γ coincidence data. A large, peak-like structure observed between 2.3-3.0 MeV in excitation energy in the triton energy spectra was also investigated. The orbital angular momentum transfer was probed by comparing the experimental angular distributions of the outgoing tritons to calculated DWBA curves. The angular distributions of the outgoing tritons populating the peak-like structure are remarkably similar in the two reactions, and are significantly different to the angular distributions associated with the nearby continuum region. Relative partial cross sections for the observed levels, angle averaged between 34 and 58 degrees, were measured. In 150 Sm 39(4)% of the strength of the peak-like structure could be accounted for by the observed discrete states. This compares to a value of 93(15)% for 152 Sm.

γ -ray spectroscopy of Sm150 through the β decay of PmSchmelzenbach1, Krane2, Wood3 et al. 2018Phys. Rev. C2000View full textAdd to dashboardCite

“…In this way, the 150 Eu m decay data help confirm placements of many transitions observed in the more complicated decay scheme of 150 Pm. In previous experiments, 150 Sm was studied through both of these decays [9][10][11], as well as through Coulomb excitation and particle reactions [12][13][14][15]. In the present study, the use of a detector array made it possible to identify weak transitions and unravel a complicated decay scheme with much greater confidence.…”

Semiclassical calculations for the Gd156 (p,d) reaction

“…Additionally, we believe that when the incoming proton wavelength is considerably smaller than the nuclear size, then this simplistic semi-classical code achieves a comparable fit with experimental results for the case of the angular momentum transfer L=0 as compared to the DWBA approach used by the standard codes [11,12,13,14]. Also, since the presented approach is particularly suited for describing the angular momentum transfer L=0, then it may provide an elegant framework for future investigations of excited 0 + states populated in: (a) the (p,t) reaction [2,4,[36][37][38][39][40][41][42], (b) the (t,p) reaction [43,44], (c) the (d,p) reaction [45], and (d) the more heavier projectile reaction such as 3 ( He, ) α [46][47][48][49][50][51].…”

Entry-level spin distributions and relative γ -neutron branching ratios of samarium isotopes populated by the (p,t) reaction

“…In this paper, results from an experiment using the recently commissioned Hyperion array, located at the Texas A&M Cyclotron institute, are presented. These results, along with those from past experiments on Samarium isotopes [4], are used to extract the spin distribution of the intended surrogate reaction using theoretical models of γ-ray emission and compared with a semi-classical calculation of the spin distribution resulting from lightion, heavy-target reactions. Two new codes, not previously presented in literature, will be discussed, as well as conclusions and outlook of the results.…”