On the β-decaying (21+) spin gap isomer in 94Ag

Plettner, C.; Grawe, H.; Mukha, I.; Döring, J.; Nowacki, F.; Batist, L.; Blazhev, A.; Hoffman, C. R.; Janas, Z.; Kirchner, R.; Commara, M. La; Mazzocchi, C.; Roeckl, E.; Schwengner, R.; Sl, Tabor; Wiedeking, M.

doi:10.1016/j.nuclphysa.2003.12.014

Cited by 55 publications

(29 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Because of the recent experimental successes, the highspin I π = 21 + and low-spin 7 + isomers in the odd-odd N = Z nucleus 94 Ag have become a discussion focus [8,9,10,11]. In this nucleus, the high-spin 21 + isomer has a high excitation energy of 6.7 (5) MeV with a notably long half-life of 0.39(4) s, and is open to β, one-proton, and two-proton decays [12,13].…”

Section: Introductionmentioning

confidence: 99%

“…In this nucleus, the high-spin 21 + isomer has a high excitation energy of 6.7 (5) MeV with a notably long half-life of 0.39(4) s, and is open to β, one-proton, and two-proton decays [12,13]. Although the shell model calculations with the empirical effective interaction in the restricted (1p 1/2 , 0g 9/2 ) model space could reproduce the energy levels and high-spin isomers in 95 Ag, 95 Pd, and 94 Pd, it failed to predict the isomerism of 21 + state in 94 Ag [9,10]. On the other hand, it has been shown that the large-scale shell model calculations with the extended model space (0g 9/2 , 1d 5/2 , 0g 7/2 , 1d 3/2 , 2s 1/2 ) can obtain a 21 + -19 + level inversion, which suggests that the core excitations across the 100 Sn shell-closure play a crucial role in generating the 21 + isomer with such a long halflife [9].…”

Section: Introductionmentioning

confidence: 99%

“…It has recently been pointed out [14] that the large-deformation claim remains a puzzle. On the other hand, the half-life of the low-spin 7 + isomer has been measured to be 0.59(2) s [9], while the excitation energy is yet to be determined.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Structure of upper-g9/2-shell nuclei and shape effect in theAg94

et al. 2008

View full text Add to dashboard Cite

Using a shell model which is capable of describing the spectra of upper g 9/2 -shell nuclei close to the N = Z line, we study the structure of two isomeric states 7 + and 21 + in the odd-odd N = Z nucleus 94 Ag. It is found that both isomeric states exhibit a large collectivity. The 7 + state is oblately deformed, and is suggested to be a shape isomer in nature. The 21 + state becomes isomeric because of level inversion of the 19 + and 21 + states due to core excitations across the N = Z = 50 shell gap. Calculation of spectroscopic quadrupole moment indicates clearly an enhancement in these states due to the core excitations. However, the present shell model calculation that produces the 19 + -21 + level inversion cannot accept the large-deformation picture of Mukha et al. in Nature 439, 298 (2006).

show abstract

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Structure of upper-g9/2-shell nuclei and shape effect in theAg94

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Among the relevant topics are the robustness of the N = Z = 50 shell closures in 100 Sn and the superallowed Gamow-Teller decay [1]; the limit of bound N = Z heavy nuclei and the location of the proton dripline; the role of T = 0 proton-neutron (pn) interactions in contrast isomers in 94 Ag, 96 Cd, and 98 In [3,[13][14][15][16][17][18][19]; and core-excited isomers in 96 Ag and 98 Cd [20][21][22]. This is by no means an exhaustive list.…”

Section: Introductionmentioning

confidence: 99%

Properties of γ -decaying isomers and isomeric ratios in the Sn100 region

Park¹,

Krücken²,

Lubos³

et al. 2017

Phys. Rev. C

Self Cite

View full text Add to dashboard Cite

Half-lives and energies of γ rays emitted in the decay of isomeric states of nuclei in the vicinity of the doubly magic 100 Sn were measured in a decay spectroscopy experiment at Rikagaku Kenkyusho (The Institute of Physical and Chemical Research) of Japan Nishina Center. The measured half-lives, some with improved precision, are consistent with literature values. Three new results include a 55-keV E2 γ ray from a new (4 + ) isomer with T 1/2 = 0.23(6) μs in 92 Rh, a 44-keV E2 γ ray from the (15 + ) isomer in 96 Ag, and T 1/2 (6 + ) = 13(2) ns in 98 Cd. Shell-model calculations of electromagnetic transition strengths in the (p 1/2 ,g 9/2 ) model space agree with the experimental results. In addition, experimental isomeric ratios were compared to the theoretical predictions derived with an abrasion-ablation model and the sharp cutoff model. The results agreed within a factor of 2 for most isomers. From the nonobservation of time-delayed γ rays in 100 Sn, new constraints on the T 1/2 , γ -ray energy, and internal conversion coefficients are proposed for the hypothetical isomer in 100 Sn.

show abstract

“…The (21 + ) isomeric state of the lightest known isotope of silver, N=Z 94 Ag, has been identified as a spin trap having the highest spin ever observed for β-decaying nuclei. The isomer is characterised by a half-life of 0.39(4) s [1], a high excitation energy of 6.7(5) MeV [2] and a high spin [3]. These unique properties are matched by several decay modes including β decay, one-proton and two-proton emission which, if confirmed, would make this state unprecedented in the entire known Segré chart.…”

Section: Introductionmentioning

confidence: 96%

A hot cavity laser ion source at IGISOL

et al. 2009

View full text Add to dashboard Cite

Abstract. A development program is underway at the IGISOL (Ion Guide Isotope Separator On-Line) facility, University of Jyväskylä, to efficiently and selectively produce low-energy radioactive ion beams of silver isotopes and isomers, with a particular interest in N=Z 94 Ag. A hot cavity ion source has been installed, based on the FEBIAD (Forced Electron Beam Induced Arc Discharge) technique, combined with a titanium:sapphire laser system for selective laser ionization. The silver recoils produced via the heavy-ion fusion-evaporation reaction, 40 Ca 58 Ni, p3n 94 Ag, are stopped in a graphite catcher, diffused, extracted and subsequently ionized using a three-step laser ionization scheme. The performance of the different components of the hot cavity laser ion source is discussed and initial results using stable 107,109 Ag are presented.PACS. 42.55.-f Lasers -32.80.Fb Photoionization of atoms and ions

show abstract

On the β-decaying (21+) spin gap isomer in 94Ag

Cited by 55 publications

References 33 publications

Structure of upper-g9/2-shell nuclei and shape effect in theAg94

Structure of upper-g9/2-shell nuclei and shape effect in theAg94

Properties of γ -decaying isomers and isomeric ratios in the Sn100 region

A hot cavity laser ion source at IGISOL

Contact Info

Product

Resources

About