Generation of excited<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>K</mml:mi></mml:math>bands in heavy nuclei

Buck, B.; Merchant, A. C.; Perez, S. M.

doi:10.1103/physrevc.84.034310

Cited by 3 publications

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“…These results imply absolutely no dependence on Z d Z e and very weak dependence on A e . The preformation probabilities found for the range of clusters considered here are ≈ 10 −2 to 10 −3 which tend to disagree with the results of a potential model with preformed clusters [21,22,23]. It is interesting to see in Table I that for α cluster the agreement is excellent.…”

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confidence: 49%

Cluster radioactivity in very heavy nuclei: a new perspective

Routray¹,

Nayak²,

Basu³

2009

Nuclear Physics A

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Exotic cluster decay of very heavy nuclei is studied using the microscopic nuclear potentials obtained by folding density dependent M3Y effective interaction with the densities of the cluster and the daughter nuclei. The microscopic nuclear potential, Coulomb interaction and the centrifugal barrier arising out of spin-parity conservation are used to obtain the potential between the cluster and the daughter nuclei. Half life values are calculated in the WKB framework and the preformation factors are extracted. The latter values are seen to have only a very weak dependence on the mass of the emitted cluster. [3,4] with reasonable success. This was followed by the preformed cluster model (PCM) calculations which is distinguished by the inclusion of the cluster preformation probability and was applied to α decay [5] with similar success. But both the theoretical approaches described above use phenomenological potentials for the nucleusnucleus interactions. The ASAFM uses a parabolic potential approximation for the nuclear interaction within a superasymmetric fission model description which yields analytical expressions for the decay lifetimes, while the PCM uses a cos-hyperbolic form for nuclear interaction potential arising from the folding integral with sufficiently well known charge densities and the resulting nuclear potential could be more or less accurately parameterized to such a form. KeywordsIn the present work the phenomena of nuclear cluster radioactivity is studied theoretically using microscopic potentials within WKB framework of quantum tunneling. The microscopic nuclear interaction potential is calculated by folding the density distributions of the emitted and daughter nuclei with density dependent M3Y effective interaction (DDM3Y). The DDM3Y effective nucleon-nucleon (NN) interaction used here was peviously used successfully for elastic and inelstic scattering of protons [6,7], proton radioactivity [8] and α radioactivity [9, 10] whose density dependence was obtained from nuclear matter calculations [11]. The cluster preformation factors are extracted from the calculated and * E-mail: trr1@rediffmail.com; E-mail: jagat.su˙ph@yahoo.in; Email: dnb@veccal.ernet.in the measured half lives of cluster radoactivity and its systematics are studied.The decay constant λ for cluster radioactivity is a product of cluster preformation probability P 0 in the ground state, the tunneling probability through barrier P and the assault frequency ν. Cluster emission half life T 1/2 = ln 2/λ calculated within WKB framework for barrier penetration probability P is:where E v , the zero point vibration energy, is assumed to be proportional to Q-value of the spontaneous cluster emission. The WKB action integral is given bywhere the total interaction energy between the emitted cluster and the daughter nucleus E(R)=V N (R)+V C (R)+ h 2 l(l + 1)/(2µR 2 ) is equal to the sum of the nuclear interaction energy, Coulomb interaction energy and the centrifugal barrier arising from spin-parity conservation. The reduced mass µ = mA e ...

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confidence: 49%

Cluster radioactivity in very heavy nuclei: a new perspective

Routray¹,

Nayak²,

Basu³

2009

Nuclear Physics A

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“…4 shows a schematic view of the Double Chooz detector [35]. The central part (i) is the neutrino target which consists of a Gadolinium (Gd)-loaded liquid scintillator [36], with a 10 m 3 volume, contained in an acrylic vessel. The second liquid layer (ii) is Gd-free liquid scintillator nicknamed γ-catcher, which detects γ-rays escaping from the target region.…”

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confidence: 99%

Double Chooz and a history of reactor θ13 experiments

Suekane

Bezerra

2016

Nuclear Physics B

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This is a contribution paper from the Double Chooz (DC) experiment to the special issue of Nuclear Physics B on the topics of neutrino oscillations, celebrating the recent Nobel prize to Profs. T. Kajita and A.B. McDonald.DC is a reactor neutrino experiment which measures the last neutrino mixing angle θ 13 . The DC group presented an indication of disappearance of the reactor neutrinos at a baseline of ∼1 km for the first time in 2011 and is improving the measurement of θ 13 . DC is a pioneering experiment of this research field. In accordance with the nature of this special issue, physics and history of the reactor-θ 13 experiments, as well as the Double Chooz experiment and its neutrino oscillation analyses, are reviewed.

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Electromagnetic transition strengths in heavy nuclei

2012

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We calculate reduced B(E2) and B(M1) electromagnetic transition strengths within and between K-bands in support of a recently proposed model for the structure of heavy nuclei. Previously, only spectra and a rough indication of the largest B(E2) strengths were reported. The present more detailed calculations should aid the experimental identification of the predicted 0 + , 1 + and 2 + bands and, in particular, act to confirm or refute the suggestion that the model 0 + and 2 + bands correspond to the well known and widespread beta and gamma bands. Furthermore they pinpoint transitions which can indicate the presence of a so far elusive 1 + band by feeding relatively strongly into or out of it. Some of these transitions may already have been measured in 230 Th, 232 Th and 238 U.

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Generation of excitedKbands in heavy nuclei

Cited by 3 publications

References 28 publications

Cluster radioactivity in very heavy nuclei: a new perspective

Cluster radioactivity in very heavy nuclei: a new perspective

Double Chooz and a history of reactor θ13 experiments

Electromagnetic transition strengths in heavy nuclei

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