Gamow-Teller beta decay of the very neutron-deficientN=50 nuclide98Cd

Płochocki, A.; Rykaczewski, K. P.; Batsch, T.; Szerypo, J.; Ż̷ylicz, J.; Barden, R.; Klepper, O.; Roeckl, E.; Schardt, D.; Gabelmann, H.; Hill, P.; Ravn, H.L.; Thorsteinsen, T.F.; Grant, I. S.; Grawe, H.; Manakos, P.; Skouras, L.D.

doi:10.1007/bf01294487

Cited by 45 publications

(23 citation statements)

References 23 publications

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“…Concordantly, the absence of delayed 61-keV γ rays in this work suggests a placement of the 61-keV transition above the 107 keV with appropriate changes in spin assignments (see Fig. 7) to comply with σ values previously determined from comparisons of IC coefficients [63]. The revised level scheme was presented in previous works [51,52] supported by SM calculations employing the "SR88MHJM" interaction [6,32]; this model includes final monopole corrections to the "SR88MHJ" interaction [64], and was used to calculate the B(E2) value of the 107-keV transition.…”

Section: Low-spin States In 98 Agsupporting

confidence: 88%

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

Park¹,

Krücken²,

Lubos³

et al. 2017

Phys. Rev. C

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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.

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Section: Low-spin States In 98 Agsupporting

confidence: 88%

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

Park¹,

Krücken²,

Lubos³

et al. 2017

Phys. Rev. C

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“…The experimental GT strength in standard units is related to the half-life via BðGTÞ ¼ 3860ð18ÞI fT 1=2 [40], where I is the branching ratio and f is the phase space function tabulated for various Q EC values in Ref. [41].…”

mentioning

confidence: 99%

16+Spin-Gap Isomer inCd96

Singh¹,

Liu²,

Wadsworth³

et al. 2011

Phys. Rev. Lett.

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A -decaying high-spin isomer in 96 Cd, with a half-life T 1=2 ¼ 0:29 þ0:11 À0:10 s, has been established in a stopped beam rare isotope spectroscopic investigations at GSI (RISING) experiment. The nuclei were produced using the fragmentation of a primary beam of 124 Xe on a 9 Be target. From the half-life and the observed decays in the daughter nucleus, 96 Ag, we conclude that the -decaying state is the long predicted 16 þ ''spin-gap'' isomer. Shell-model calculations, using the Gross-Frenkel interaction and the ðp 1=2 ; g 9=2 Þ model space, show that the isoscalar component of the neutron-proton interaction is essential to explain the origin of the isomer. Core excitations across the N ¼ Z ¼ 50 gaps and the Gamow-Teller strength, BðGTÞ distributions have been studied via large-scale shell-model calculations using the ðg; d; sÞ model space to compare with the experimental BðGTÞ value obtained from the half-life of the isomer. DOI: 10.1103/PhysRevLett.107.172502 PACS numbers: 21.60.Cs, 23.20.Lv, 23.35.+g, 26.20.Àf The nuclear landscape around the heaviest known bound doubly magic self-conjugate nucleus 100 Sn, which resides far from the valley of stability, exhibits a rich variety of nuclear structure phenomena [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. A feature of great interest in this region is the presence of isomeric states, especially those which may undergo particle decay. Indeed, early work by Peker et al. was paramount in motivating studies of such states based on three or four particle/hole configurations in nuclei. This included the 16 þ isomeric state in 96 Cd, which was suggested to result from a four-hole configuration relative to a 100 Sn core that may decay via proton radioactivity [1].A particularly interesting issue in this region is the role played by the neutron-proton, np, interaction in leading to the existence of the isomers. The isovector (T ¼ 1) component of the interaction between like-nucleons is known to dominate in all non-self-conjugate nuclei while the T ¼ 1 np interaction has been shown to have a major influence on the N ¼ Z line below mass 80 due to the large overlap of the proton and neutron wave functions [16]. Although calculations suggest an important influence of the isoscalar (T ¼ 0) np interaction on the structure of medium-heavy N ¼ Z nuclei, its role has been less clear and often debated [17][18][19][20]. Very recent experimental work has claimed the first indications for the crucial role of this interaction at low spins in 92 Pd, that are supported by shell-model (SM) calculations [2]. In order to establish or dispute the expected strong influence of the T ¼ 0 np interaction for self-conjugate nuclei close to 100 Sn, it is of paramount importance to obtain further evidence for its effects.Long standing SM calculations for the self-conjugate nucleus 96 Cd predict the presence of a 16 þ state at an energy lower than that of the first 12 þ and 14 þ states [10]. This situation arises from the strong influence of the T ¼ 0 np interaction and results in ''spin-...

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“…We are also constrained by computational limitations [4,5].This is related to the fact that the previous work did not take into account the renormalization of the proton-proton interaction going from SNA to SNB. ) Finally, we come back to a discussion of the neutron single-particle energies and the related proton-neutron interaction which are particularly important for the Gamow-Teller decay properties.…”

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confidence: 99%

Gamow-Teller strength in the region ofSn100

Brown

Rykaczewski

1994

Phys. Rev. C

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New calculations are presented for Gamow-Teller beta decay of nuclei near 'Sn. Essentially all of the Sn Gamow-Teller decay strength is predicted to go to a single state at an excitation energy of 1.8 MeV inIn. The first calculations are presented for the decays of neighboring odd-even and odd-odd nuclei which show, in contrast to ' Sn, surprisingly complex and broad Gamow-Teller strength distributions. The results are compared to existing experimental data and the resulting hindrance factors are discussed.PACS number(s): 21.10. Pc, 21.60.Cs, 23.40.Hc, 27.60.+j One of the primary new directions in nuclear spectroscopy is in the experimental study and theoretical understanding of nuclei near the limits of particle stability. The heaviest nucleus with an equal number of protons and neutrons predicted to be stable is Sn, and experiments are being planned and carried out at several laboratories to produce and study the decay of this nucleus [1] and others [2,3] in this mass . "egion. One of the most interesting aspects of these proton-rich nuclei is that most of the giant Gamow-Teller resonance lies within the beta-decay Q-value window. We report here on new calculations which show some of the unusual features which one may expect to see in these decays, the special problems associated with their experimental detection and the important nuclear structure information that will be obtained.Our model space, which is similar to that of a number of other calculations [4 -7], is designed for nuclei with Z~50 and ¹~50and starts from a closed-shell configuration for

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Gamow-Teller beta decay of the very neutron-deficientN=50 nuclide98Cd

Cited by 45 publications

References 23 publications

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

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

16+Spin-Gap Isomer inCd96

Gamow-Teller strength in the region ofSn100

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