The beta-decay of95Rb and97Rb

Kratz, K. L.; Ohm, H.; Schröder, A.; Gabelmann, H.; Ziegert, W.; Pfeiffer, B.; Jung, G.; Monnand, E.; Pinston, J.A.; Schüßler, F.; Crawford, G.I.; Prussin, S.G.; Oliveira, Z.M.

doi:10.1007/bf01411659

Cited by 45 publications

(46 citation statements)

References 39 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The analysis of the proposed band members in the frame of the rotational model is shown Table I. For K=3/2, the E2/MI mixing ratio for the 102.0 keV transition from the 687.1 keV level to the band head which has been deduced from the intraband ~-intensities, agrees very well with the experimental one from the conversion coefficient [3]. Also the moment of inertia of 80~ of the rigid rotor value fits well into the systematics in the A=IO0 region.…”

supporting

confidence: 58%

“…With this interpretation, the isomeric character (t~/2=170 ns) of the g7/2 state at 308 keV results from the E2 deexcitation to the first excited level with a transition rate close to the single-particle value, and is not associated with the ~ [404 9/2] intruder as proposed in [10]. Thus, the lowest levels of 97Sr have spherical character.In contrast, the levels at 585.1 and 687.1 keV [3] together with the new level at 822.4 keV (see Fig. 1) are proposed to form a rotational band.…”

mentioning

confidence: 91%

“…of 97Sr is associated to the spherical (~2~ 0.05) neutron configuration (gT/2)zsl/2. This assignment, together with the known multipolarities of the ~-transitions [3], allows to deduce J~= 3/2 + , respectively 7/2 + for the first two excited states at 167 and 308 keV (see Fig. I).…”

mentioning

confidence: 93%

“…The 5/2 § level at 600.5 keV [3], which is populated in ~-decay with a log(ft)=5.8, may be attributed to the v[413 5/2] Nilsson orbital predicted around 0.67 MeV with log(ft)ReA=5.9. The experimental log(ft) is close the values of 5.6 for the 3/2 * and 5/2 § members of the K=3/2 band discussed above, but is significantly lower than the log(ft) to the lowlying spherical states (see Fig.…”

mentioning

confidence: 94%

“…This raises the question about the nature of the N=59 intermediate nuclei. The striking similarities between the lowest excited levels in the N=59 isotones 97Sr and 99Zr on the one hand, and the spherical N=57 isotones 95Sr and 97Zr on the other hand [2][3][4] suggest sphericity for the low-excitation region of 97Sr. Recent Laser-spectroscopic measurements have furthermore shown that ~TSr has a groundstate (g.s.)…”

mentioning

confidence: 99%

See 4 more Smart Citations

Shape coexistence in theN=59 isotone97Sr

Lhersonneau

Pfeiffer

Kratz

et al. 1988

Z. Physik A - Atomic Nuclei

Self Cite

View full text Add to dashboard Cite

Experimental evidence for shape coexistence in the N=59 isotone 97Sr is presented. The ground state and the lowest excited levels are confirmed to be spherical. At 585.1 keV, a K=3/2 rotational band built on the v[422 3/2] Nilsson configuration has been identified. Nilsson orbital assignments for three further levels of deformed origin are proposed. The results are compared to RPA shell-model predictions.For the 38Sr, 3gY and 4oZr nuclei near A=IO0, a sudden onset of strong deformation at N=60 has been observed, whereas the lighter isotopes up to N=58 keep a spherical shape [1]. This raises the question about the nature of the N=59 intermediate nuclei. The striking similarities between the lowest excited levels in the N=59 isotones 97Sr and 99Zr on the one hand, and the spherical N=57 isotones 95Sr and 97Zr on the other hand [2][3][4] suggest sphericity for the low-excitation region of 97Sr. Recent Laser-spectroscopic measurements have furthermore shown that ~TSr has a groundstate (g.s.) spin of I=1/2 which has been interpreted as a vsl/2 shell-model state [5]. On the other hand, quasi-particle RPA calculations [6] have shown that the overall shape of the GamowTeller (GT) strength function of ~TSr could only be reproduced when strong prolate deformation was assumed [7]. Therefore, we have carefully reinvestigated the level scheme of 97Sr in order to search for a possible rotational band as a clear signature of deformation, and with this of shape coexistence in this N=59 isotone.The isotope 97Sr was produced as ~-decay daughter of 97Rb at the on-line mass separator OSTIS [8] at the ILL Grenoble. Singles and ~-~-t coincidence spectra have been recorded. Conversion coefficients were determined by the fluorescence method. For the lifetime measurements the centroid-shift method was used [9].According to the recent spin determination [5], to the GT-decay properties of 97Sr to 97y, and to our shell-model calculations [6,7], the J==1/2 § g.s. of 97Sr is associated to the spherical (~2~ 0.05) neutron configuration (gT/2)zsl/2. This assignment, together with the known multipolarities of the ~-transitions [3], allows to deduce J~= 3/2 + , respectively 7/2 + for the first two excited states at 167 and 308 keV (see Fig. I). These levels have a character quite similar to the corresponding ones in the spherical N=57 isotopes 95 97 Sr and Zr. With this interpretation, the isomeric character (t~/2=170 ns) of the g7/2 state at 308 keV results from the E2 deexcitation to the first excited level with a transition rate close to the single-particle value, and is not associated with the ~ [404 9/2] intruder as proposed in [10]. Thus, the lowest levels of 97Sr have spherical character.In contrast, the levels at 585.1 and 687.1 keV [3] together with the new level at 822.4 keV (see Fig. 1) are proposed to form a rotational band. The first two states are populated in ~-decay of the ~[431 3/2] g.s. of 97Rb with log(ft)=5.6, each, allowing I n= (i/2-5/2) + for both of them. Selection rules for ~-transitions further limit the sp...

show abstract

supporting

confidence: 58%

mentioning

confidence: 91%

mentioning

confidence: 93%

mentioning

confidence: 94%

mentioning

confidence: 99%

See 3 more Smart Citations

Shape coexistence in theN=59 isotone97Sr

Lhersonneau

Pfeiffer

Kratz

et al. 1988

Z. Physik A - Atomic Nuclei

Self Cite

View full text Add to dashboard Cite

show abstract

Experimental Evidence for Shape Coexistence in 97Sr59 and Implications for the Structure of the Odd-Odd Isotone 98Y

Lhersonneau

Kratz

Ohm³

et al. 1988

Nuclear Structure of the Zirconium Region

Self Cite

View full text Add to dashboard Cite

Experimental evidence for shape coexistence in the odd-mass N=59 isotone 97Sr is presented. The ground state and the lowest excited levels of 97Sr are shown to be spherical, whereas a rotational band based on a state at 585 keY has been identified. Three further levels of deformed origin are proposed. Nilsson-orbital assignments are supported by RPA shell-model calculations. These findings lead to a better understanding of the-structure of the odd-odd N=59 isotone 9ay.

show abstract

Nuclear ground state spins of short-lived strontium isotopes

Buchinger

Ramsay

Silverans

et al. 1987

Z. Physik A - Atomic Nuclei

View full text Add to dashboard Cite

Nuclear ground state spins of the odd-mass strontium isotopesbetween A = 79 and 97 were determined by measurements of the hyperfine structure in the ionic transition 5s 2SI/2 -5p 2P3/9-The spins of 93Sr and 97Sr'are revised To I = 5/2 and I = I/2, respectively, while assignments for the remaining isotopes are confirmed.The sequence of strontium isotopes ranges from the N : 50 shell closure for 88Sr into the regions of well-developed deformation for both neutron-deficient and neutron-rich isotopes. Laser spectroscopy measurements of the ground state moments and radii mainly cover the transitional region of the neutron-deficient branch [1,2]. We have recently started a more extended investigation of the nuclear ground state properties in strontium in an on-line experiment at the mass separator ISOLDE at CERN. In this communication we report the determination of the spins for the odd-A isotopes with 79 S A S 97 from the atomic hyperfine structure (hfs). This series of sDins includes two controversial cases, 93Sr and 97Sr, where first spin assignments from nuclear spectroscopy were revised later on [3 7]. Among these, 97Sr deserves special attention since the odd-mass isotones with N = 59 are considered to be an excellent testing ground for nuclear models because of their unique situation in the narrow range of neutron numbers where shape coexistence is indicated [7,8].Our hfs measurements have been performed 5s 2SI/2 -5p 2F3/2 transition in the (l = 407.8 nm) of the Sr § ion. We used the technique of cellinear fast-beam laser spectroscopy and the experimental procedure is similar to that one described in ref. [9]. * Present ad'dress: Fhysikalisch-Technisc~e Bundesanstalt,

show abstract

The beta-decay of95Rb and97Rb

Cited by 45 publications

References 39 publications

Shape coexistence in theN=59 isotone97Sr

Shape coexistence in theN=59 isotone97Sr

Experimental Evidence for Shape Coexistence in 97Sr59 and Implications for the Structure of the Odd-Odd Isotone 98Y

Nuclear ground state spins of short-lived strontium isotopes

Contact Info

Product

Resources

About