The deformation of101Zr

The Q/~-values of l~ 1~176 and lo1,102y have been measured for the first time at the mass separator ISOLDE by means of/~7-coincidence techniques with a plastic scintillation detector telescope and a large Ge(HP)-detector. For some of these nuclei, also new details of their decay schemes could be derived from the measured fl-decay properties. The experimental results are discussed, as far as the systematics of two-neutron separation energies derived from them is concerned. In addition, the nuclear masses deduced from these Q,-values are compared with the predictions of recent mass calculations.

Section: Io1k> H 37~-u64supporting

confidence: 86%

Section: L~ 39i62mentioning

confidence: 87%

Experimental beta-decay energies of very neutron-rich isobars with mass numbers A=101 and A=102

Balog

Graefenstedt

Groß

et al. 1992

“…which this band has also been identified [25]. The energy spacing between the 5/2-and 7/2-members is much smaller here than that in l~ This may be due to a larger deformation of l~ leading to a smaller Coriolis coupling than in ~~ Unfortunately, the deformation of ~~ is only known [41] with moderate precision: /~q= 0.32 (6). But the comparison [44] of the staggering of g.s.…”

Section: -mentioning

confidence: 97%

The structure of the deformed nucleus 42 103 Mo61

Liang

Ohm

Ragnarsson³

et al. 1993

Self Cite

Abstract. The lifetimes of the three lowest excited members of the rotational ground-state band of 1~ at 102.6, 241.1 and 433.2 keV as well as of the levels at 353.8 and 456.1 keV have been determined through a measurement of the delayed coincidences between/~ particles from the decay of the parent l~ and the 7 rays which depopulate the levels. A plastic and a BaF 2 detector have been used for the /~ and 7 rays, respectively, in these experiments at the fission product separator JOSEF. The results for all three band members evince that this nucleus has a sizeable deformation, with a value of/3q=0.34(1). This value is larger than that of the neighbouring eveneven Mo isotopes which indicates an odd-even effect. On the other hand it confirms the observation that the Mo nuclei are in general less strongly deformed than their Sr and Zr isotones. Particle-rotor model calculations with the Nilsson parameters ~c = 0.084, j~ = 0.28 provide a good description of the ground-state band and of a side band based on the 346.5 keV level, including the new lifetimes. This substantiates the Nilsson orbital assignments of [41113/2 + and [532]5/2-for these two bands, respectively, where the sideband is strongly affected by a [54113/2-admixture. There is evidence for an additional band based on the 641.1 keV level for which the assignment [42213/2 + is proposed.

“…Ar and Ar are the peak areas of the X rays and the V rays, respectively, and eK and e~ the detection efficiencies for them. The conversion coefficient is c~K(119.3 keV) 916(53)57 (24) x ~210"0 x 1.60 x 0@90=0.15 (7). The procedure has been checked using transitions with known multipolarity of neighbouring nuclei which were present in the beam of JOSEF.…”

Section: A T ~: Cok" Ir~ Acmentioning

confidence: 99%

The deformedN=60 nucleus 41 101 Nb

Ohm

Liang

Paffrath

et al. 1991

Self Cite

The/~-decay of a~ has been investigated at the fission-product separators JOSEF and LOHENGRIN. The half-life of a~ has been determined to 2.5(1)s and a level scheme for t~ has been established from 7 ray singles as well as X-7 and 7-7 coincidence measurements. Conversion coefficients for transitions in l~ and level half-lives between 10 ps and 2 ns have been determined. Three rotational bands are identified among the low-lying levels with band heads at 0 keV, 206 keV and 208 keV. The bands are probably based on the Nilsson configurations [422 5/2+], [301 3/2-] and [303 5/2-], respectively. The deformation has been determined to /?q=0.40(4) and 0.41(8) for the ground state band and the band based on the 206 keV level from the half-lives of the first and second excited members of these bands. This shows that the rapid onset of deformation at N = 60 which is typical for the A = 100 region of neutron-rich nuclei, takes also place in the Nb isotopes. Nilsson model calculations describe the experimental data well, especially the several determined transition probabilities including those for E1 transitions from the 206 and 208 keV band heads to the ground state.