High spin spectroscopy and lifetime measurements inHf169

Abstract

Two experiments were carried out to study the y-ray spectroscopy and hfetimes of the high-spin states of ' Hf, using the reaction ' Te( Ca, 5n). The yrast band has been extended to I = -'+ from the previously known I = -'+. Three other bands were also extended to higher spin. The experimental Routhians, alignments, and signature splittings were interpreted within the framework of the cranked shell model (CSM). Good agreement is obtained between experimental results and the CSM calculations for the first band crossings due to ii3/7 neutron alignments. The nature of the second upbends observed in (+, +~) , ( -, + -, '), and ( -, -~) bands is discussed. Lifetimes of 17 high-spin levels within range -&I & -' in four different bands were measured by using the Doppler shift attenuation method. The values of transition quadrupole moments derived from the measured lifetimes are compared with the results of total Routhian surface calculations, and a general agreement is obtained.

Multi-quasiparticle structures up to spin~44ℏin the odd-odd nucleusTaWang1, Hartley2, Riley3 et al. 2010Phys. Rev. C5420View full textAdd to dashboardCite

“…Such mixed crossings have previously been discussed in the osmium-iridium region [32]. Furthermore, the same orbitals have been proposed to explain similar high-frequency alignments in neighboring 169 Hf [33].…”

High-spin states in165Hf

“…High-spin states in Hf nuclei have been the subject of intensive experimental investigations in recent years [1][2][3][4][5][6][7]. Many rotational bands based on various intrinsic configurations and crossings of bands with different numbers of aligned quasiparticles have been identified.…”

Quasiparticle alignments andα-decay fine structure of175Pt

“…For this reason the lowest quasineutron AB alignment is blocked. The next available aligned quasineutron configuration is ABC or BAD as has been suggested for 169 Hf [56], 171 W [57], and 173 Os [35]. After the low-frequency alignment change at ω ≈ 0.2 MeV, the alignment of the (π,α) = (+,− 1 2 ) band stays constant in 175 Pt until the very last measured transition.…”

“…12(b). When the odd neutron is occupying a negative-parity state, the AB alignment is not blocked, making it a likely candidate for the observed alignments [35,56,57]. The AB alignment is also assumed to take place in the negative-parity band of 175 Pt starting at ω = 0.2 MeV.…”