Nuclear levels inLu176

Abstract

The nuclear structure of '"Lu has been studied with the (t,u) reaction on an isotopically enriched target of '"Hf using a 17 MeV triton beam and a quadrupole-triple-dipole-type spectrometer. These measurements were combined with published (n, P), (n,e ), and (d,p) data to construct a level scheme for ' Lu. The Nilsson model including Coriolis coupling c'lculations has been used to interpret the level structure. The previously known Nilsson configurations 7/2+ f404] + 7/2 [514], 7/2+[404] -7/2 f514], 7/2+[404] -9/2+ f624], and 9/2 [514] -7/2 [514] with bandhead energies 0, 240.56, 198.01, and 342.48 keV, respectively, have been populated in the (t,a) reaction. Proposed new Nilsson configurations and bandhead energies are: 5/2+[402] -7/2 [514] at 390.21 keV, 9/2 [514] + 7/2 [514] at 485.7 keV, 5/2+[402] + 7/2 [514] at 563.89 keV, 1/2+[411] + 7/2 [514] at 726.51 keV, 1/2+ [411] -7/2 [514] at 838.36 keV, 7/2 [523] + 7/2 [514] at 1273 keV, and 3/2+ [411]+ 7/2 [514] at 1390.67 keV. The five new values of the singlet-triplet splitting energies and one new E = 0 odd-even shift observed in this study are compared with theory. NUCLEAR HEACTIONS Ne+ U, El b --400 MeV/nucleon fluid dynamics, viscosity, heat conduction, cross sections. 14.3 msr. The particles were detected with a 1m long, helical proportional counter mounted along the focal plane. ' Data were collected in 1024channel bites at angles of 15, 20, 25, 30, 35, 40', and 50'. The observed energy resolution was

Nuclear structure ofLu176and its astrophysical consequences. I. Level scheme ofKlay1, Käppeler2, Beer3 et al. 1991Phys. Rev. C

“…The 1+ to 5+ members of Balodis et al [19] were confirmed via the transitions to the K =1+ band, but two suggested weak intraband transitions could not be detected. The 6+ level of Balodis et al [19] [19], and the Nilsson configuration was assigned by Dewberry et al [20]. The members from I =2 to 4 could be clearly confirmed [ Fig.…”

“…In their work, the level energies are based on the reference energy of 126.5+4 keV for the isomeric state [17]. Additional levels were postulated based on a (t, a) measurement by Dewberry et al [20] including the assignment of gamma transitions measured by Balodis et al [19];furthermore, the excitation energy of the isomer could be determined to 123+2 keV. However, it was not yet possible to establish a level that could decay to both, the ground state an, d to the isomer.…”

“…Evidence for mediating levels come from a Lu(t, a)' Lu experiment [20], where a K =6 level at 564 keV could be established, and from a Coulomb excitation measurement [22] suggesting a K =5 bandhead at -870 keV. These levels would allow for a connection of the two partial level schemes, but the experiment of Balodis et al [19] was not sensitive enough for detecting direct ground-state transitions at energies above -850 keV.…”

“…(ii) Data from the literature that have been used to complement the present work include the results from the I77Hf(t, a)' Lu experiment of Dewberry et al [20] as well as from Coulomb excitation studies [21,22].…”

Properties of the5−state at 839 keV inLu176and theMohr1, Bisterzo2, Gallino3 et al. 2009Phys. Rev. C242300View full textAdd to dashboardCite

“…High-resolution gamma-spectroscopic studies were performed using the 175 Lu(n,γ) 176 Lu reaction at the GAMS spectrometer at ILL, Grenoble [18,19,20], using HPGe detectors [19,21], and using the 176 Yb(p,n) 176 Lu reaction at the Berkeley cyclotron [22]. The 177 Hf(t,α) 176 Lu reaction was studied at Los Alamos using a Q3D magnetic spectrograph [23], and the 175 Lu(d,p) 176 Lu reaction was analyzed using the Q3D spectrograph at the Munich tandem accelerator [19]. Obviously, the s-process branching at A = 176 depends also on the neutron capture cross sections.…”