<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>β</mml:mi></mml:math>-decay half-life of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mmultiscripts><mml:mi mathvariant="normal">V</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>50</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>calculated by the shell model

Haaranen, Mikko; Srivastava, P. C.; Suhonen, J.; Zuber, Κ.

doi:10.1103/physrevc.90.044314

Cited by 17 publications

(30 citation statements)

References 20 publications

(44 reference statements)

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“…(4) (4) is restricted to two distinct cases: For a given level of forbiddeness K one only needs to add up the terms that satisfy k e + k ν = K + 1 and k e + k ν = K + 2. In the earlier applications (see, e.g., [30][31][32]34]) only the first-order terms in Eq. (4) are taken into account.…”

Section: Theoretical Formalismmentioning

confidence: 99%

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Forbidden nonuniqueβdecays and effective values of weak coupling constants

2016

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Forbidden nonunique β decays and effective values of weak coupling constantsHaaranen, Mikko; Srivastava, P. C.; Suhonen, Jouni Haaranen, M., Srivastava, P. C., & Suhonen, J. (2016 Forbidden nonunique β decays feature shape functions that are complicated combinations of different nuclear matrix elements and phase-space factors. Furthermore, they depend in a very nontrivial way on the values of the weak coupling constants, g V for the vector part and g A for the axial-vector part. In this work we include also the usually omitted second-order terms in the shape functions to see their effect on the computed decay half-lives and electron spectra (β spectra). As examples we study the fourth-forbidden nonunique ground-state-to-ground-state β − decay branches of 113 Cd and 115 In using the microscopic quasiparticle-phonon model and the nuclear shell model. A striking new feature that is reported in this paper is that the calculated shape of the β spectrum is quite sensitive to the values of g V and g A and hence comparison of the calculated with the measured spectrum shape opens a way to determine the values of these coupling constants. This article is designed to show the power of this comparison, coined spectrum-shape method (SSM), by studying the two exemplary β transitions within two different nuclear-structure frameworks. While the SSM seems to confine the g V values close to the canonical value g V = 1.0, the values of g A extracted from the half-life data and by the SSM emerge contradictory in the present calculations. This calls for improved nuclear-structure calculations and more measured data to systematically employ SSM for determination of the effective value of g A in the future.

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Section: Theoretical Formalismmentioning

confidence: 99%

“…This formalism was previously applied to the studies of such decays, e.g., in Refs. [30][31][32]. We do not discuss the properties and details of the two nuclear models in the current work but rather refer the reader to take a look at, e.g., [27] for the MQPM and [33] for the NSM.…”

Section: Introductionmentioning

confidence: 99%

Forbidden nonuniqueβdecays and effective values of weak coupling constants

2016

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“…The 190 Pt- 186 Os system is an interesting tool to investigate the chronology and evolution of geo-and cosmochemistry samples (see e.g. Refs.…”

Section: The α Decay Of 190 Pt and Other Platinum Isotopesmentioning

confidence: 99%

“…In Ref. [92] and in subsequent works the half-life of 190 Pt was determined to be in the range of (3.2 − 10) × 10 11 yr for the decay to the ground state of 186 Os (see review [93] and Refs. therein); the recommended half-life value for this transition was: T α 1/2 = (6.5 ± 0.3) × 10 11 yr [94], but recently a laboratory measurement of the α decay half-life of 190 Pt has been performed using a low background Frisch grid ionization chamber.…”

Section: Pt α Decaymentioning

confidence: 99%

Experimental searches for rare alpha and beta decays

et al. 2019

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The current status of the experimental searches for rare alpha and beta decays is reviewed. Several interesting observations of alpha and beta decays, previously unseen due to their large half-lives (10 15 − 10 20 yr), have been achieved during the last years thanks to the improvements in the experimental techniques and to the underground locations of experiments that allows to suppress backgrounds. In particular, the list includes first observations of alpha decays of 151 Eu, 180 W (both to the ground state of the daughter nuclei), 190 Pt (to excited state of the daughter nucleus), 209 Bi (to the ground and excited states of the daughter nucleus). The isotope 209 Bi has the longest known half-life of T 1/2 ≈ 10 19 yr relatively to alpha decay. The beta decay of 115 In to the first excited state of 115 Sn (Eexc = 497.334 keV), recently observed for the first time, has the Q β value of only (147 ± 10) eV, which is the lowest Q β value known to-date. Searches and investigations of other rare alpha and beta decays ( 48 Ca, 50 V, 96 Zr, 113 Cd, 123 Te, 178m2 Hf, 180m Ta and others) are also discussed.

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“…sd shell: for the calculation of the wave functions and one-body transition densities related to the decay 36 Cl(2 + ) → 36 Ar(0 + ) we adopted the 0d-1s model space and the phenomenological USDB interaction [35]. pf shell: as in the earlier shell-model studies regarding the half-lives of the transitions 48 Ca(0 + ) → 48 Sc(4 + ,5 + ,6 + ) [36] and 50 V(6 + ) → 50 Cr(2 + ) [37], the 0f -1p model space with the interaction GXPF1A [38,39] was used to calculate the electron spectra of these decays. The GXPF1A interaction is very good at predicting the properties of pf -shell nuclei.…”

Section: Adopted Model Spaces and Nuclear Hamiltoniansmentioning

confidence: 99%