Levels and transitions in²²⁷Ac

Strong and Weak Coupling to the Octupole-Deformed Mode inAc89227

“…The J.+ 2 i and level at 468.9 keV decays to the f + , ^• + members of the f + band beginning at 27.38 keV, strongly suggesting a -f + assignment. A level at 537.4 keV previously assigned as -| + by Anicin et al 15 decays to the -f + and -f + members of the | + band at 27.38 keV and possibly to the i + state at 435.36 keV, suggesting a -| + assignment. Finally, a state at 657 keV decays by four transitions to the 1 + (46.32 keV), i" (74.11 keV), i + (84.55 keV), and f + (109.92 keV) states, tentatively suggesting a f* assignment.…”

“…4,5 The spectroscopy of this nucleus is most conveniently studied following the a decay of 231 Pa and the /3~ decay of 227 Ra. The earlier work on 227 Ac is summarized in the nuclear data compilation of Maples 13 with recent work by Teoh et al 14 and Anicin et al 15 Three rotational bands had been assigned 13 "" 15 : a • §" ground-state band, a f + band at 27.38 keV, and a \ band with a large decoupling parameter leading to a -I"" band head at 329.99 keV. These three bands were given Nilsson assignments of Ft532*], i+[651t], andi""[530i], respectively, and are shown in the level scheme of Fig.…”

Extension of the multiphonon method to odd mass deformed nuclei

“…The interpretation of the data obtained by e decay of 227pa leads to two rotational bands. Nuclear orientation and correlation experiments by Ani~in et al [8] allow a firmer classification of many of the observed levels with Nilsson orbitals. The energy separation of the two band heads is 64.7 keV.…”

“…The classification of these into rotational bands is often not very easy as can be seen in [3][4][5][6][7][8][9] mentioned hereafter. It is generally much more difficult to obtain information on the spins and parities of excited states and on the nature of the linking y-ray transitions.…”

Single-particle states and parity doublets in odd- Z Ac221 and Pa225 from Parr1, Smith2, Greenlees3 et al. 2022Phys. Rev. C5000View full textAdd to dashboardCite

“…The ground states of 227 Ac and 225 Ac have been assigned with I π = 3/2 − . The assignment for 227 Ac was proposed following studies of the α decay of 231 Pa [43,44] and protonstripping reactions [45] as well as direct measurements of the nuclear spin and electromagnetic moments, the latter helping to identify the single-particle orbital responsible for the ground-state configuration, via nuclear laser spectroscopy [46][47][48][49]. For 225 Ac, the assignment was made following studies of the α decay of 229 Pa [50,51] and the β − decay of 225 Ra [51].…”