Rotational band structures in¹²⁹La

Abstract

High spin states in the odd proton nucleus 129La have been investigated wing the techniques of in-beam y-ray spectroscopy. Nine rotational bands have been observed in '''La. seven for the first time. Various band crossings were observed at rotational frequencies in the range hw = 0.28-0.57 MeV. The data are mainly discussed within the frameworlt of the cranked shell model. The rotational bands are assigned quasiparticle configurations originating from zh,,lz, r g r l z . r(hlllz)2 @ r g 7 1 2 and rhlI/z @ v(hll/zgT/2) states, respectively. Four of the band crossinp are thought to be associated with the rotational alignments of the first pair of hI1/2 neutmns or protons.

Decay of 129Ce to low-lying positive-parity states in 129La

“…The ground state (I π = 3/2 + ) and the excited levels at 68.2, 248.6 and 446.5 keV with 5/2 + , 7/2 + and 9/2 + I π assignments, respectively, are observed in agreement with previous works [3,6,15]. These assignments are supported by our conversion-electron measurements ( Table 2).…”

“…These assignments are supported by our conversion-electron measurements ( Table 2). These states are the first members of the positive-parity band predominantly fed by heavy-ion induced fusion-evaporation reactions and built on the 3/2 + [422]g 7/2 Nilsson orbital [3]. There is no indication of any abnormal β-branching going directly from 129 Ce to the ground state of 129 La.…”

“…The collective bands recently seen in the 51 V( 82 Se,4n) 129 La fusion-evaporation reaction [3] are mainly related to the πh 11/2 (negative parity) and πg 7/2 (positive parity) configurations. Cranked shell model (CSM) calculations Permanent address: Laboratoire de Radiochimie, Université de Nice, F-06108 Nice Cedex, France Permanent address: Physik Department, Technische Universität München, D-85748 Garching, Germany [4] performed with deformation parameters deduced from total Routhian surface (TRS) calculations [5] were used to interpret the one-quasiproton bands at low excitation energies.…”

Combined explanations of B-physics anomalies: the sterile neutrino solution

“…Concerning the R(D ( * ) ) observables, it has recently been proposed that the measured enhancement with respect to the SM prediction can also be obtained by adding a new right-handed fermion, singlet under the SM gauge group, hereafter dubbed N R [42,43] (see also [26,[44][45][46][47] for earlier related studies). Differently from other explanations where the NP contributions directly enhance the b → cτ ν τ transition, this solution allows to evade the stringent constraints arising from the SU (2) L doublet nature of the SM ν τ neutrino.…”

Impact of sonication on activated sludge properties and consequences on PAH partitioning

“…Foladori et al [22] demonstrated the effect of sonication on bacterial viability and He et al [23] showed that sonication at 1.2 W/mL and t US 15 min (corresponding to 72 000 kJ/kg TS0 ) can inactivate 95 % of bacteria. Our results indicate that although cellular inactivation occurred, a significant fraction of the bacteria remained alive after sonication at lower power density (0.2 W/mL).…”