Neon radioactivity of uranium isotopes

Bonetti, R.; Chiesa, Carlo; Guglielmetti, A.; Migliorino, C.; Cesana, A.; Terrani, M.; Price, P. B.

doi:10.1103/physrevc.44.888

Cited by 58 publications

(89 citation statements)

References 10 publications

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“…They range from 221 Fr up to 242 Cm. The emission of 14 C, 20 O, 23 F, [24][25][26] Ne, [28][29][30] Mg, and 32,34 Si has been observed. The common factor of all cluster radioactivity events is the heavy-mass residue which is in the neighborhood of the doubly-magic 208 Pb.…”

Section: Introductionmentioning

confidence: 99%

“…In 1984 Rose and Jones [1] observed for the first time the emission of a 14 C nucleus from a 223 Ra probe. This discovery represented a milestone in the description of nuclear radioactivity as it bridged the gap between the α emission radioactivity and the standard fission reaction.…”

Section: Introductionmentioning

confidence: 99%

“…This discovery represented a milestone in the description of nuclear radioactivity as it bridged the gap between the α emission radioactivity and the standard fission reaction. Since then, cluster radioactivity (CR) has been found in twelve eveneven isotopes [2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21] and seven odd-even isotopes (see, e.g., references in Refs. [22,23]) in the actinide region.…”

Section: Introductionmentioning

confidence: 99%

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Microscopic description of cluster radioactivity in actinide nuclei

2011

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Cluster radioactivity is the emission of a fragment heavier than an α particle and lighter than mass 50. The range of clusters observed in experiments goes from 14 C to 32 Si while the heavy mass residue is always a nucleus in the neighborhood of the doubly-magic 208 Pb nucleus. Cluster radioactivity is described in this paper as very asymmetric nuclear fission. A new fission valley leading to a decay with large fragment mass asymmetry matching the cluster radioactivity products is found. The mass octupole moment is found to be more convenient than the standard quadrupole moment as the parameter driving the system to fission. The mean-field Hartree-Fock-Bogoliubov theory with the phenomenological Gogny interaction has been used to compute the cluster emission properties of a wide range of even-even actinide nuclei from 222 Ra to 242 Cm, where emission of the clusters has been experimentally observed. Computed half-lives for cluster emission are compared with experimental results. The noticeable agreement obtained between the predicted properties of cluster emission (namely, cluster masses and emission half-lives) and the measured data confirms the validity of the proposed methodology in the analysis of the phenomenon of cluster radioactivity. A continuous fission path through the scission point has been described using the neck parameter constraint.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microscopic description of cluster radioactivity in actinide nuclei

2011

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“…Both detectors were placed in subsurface pipe-like samplers (1.20 m long, with a diameter of 12 cm), which were set to a depth of about 60 cm, and isolated by a cap to minimise condensation. The track-etch detectors (LR115 films, calibrated according to [1]), exposed for two to five weeks; allowed us to build a continuous time-series of radon activity able to evidence the long-time variations. On the other hand, periodic surveys effected by means of E-PERM R electrets [2] that was exposed for one to four days, gave us the opportunity to detect short-time variations.…”

Section: Methodologies and Measurementsmentioning

confidence: 99%

Insights on radon survey at the Stromboli volcano

Laiolo

Cigolini

Coppola

et al. 2012

EPJ Web of Conferences

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We present an overview of the radon surveys at Stromboli island starting from the 2002, with the aim to better understand the relation between in-soil radon degassing and change in volcanic activity. Radon measurements were performed by means of different, passive, methodologies. By using a radon network of 21 sampling sites, placed in the NE sector of the island, we effected periodic surveys by means of two manually techniques. Track-etch detectors and EPERM electrets allowed us to construct a continuous time-series of radon measurements during the period 2002-2007 and to recognize the short-time variations. Radon activity shows, by means of EPERM R electrets, a wide range of values, from 0.3 to 50 kBq/m 3 . These data confirm the role of the local effects on the in-soil radon emissions and show that the structural alignments represent a preferential pathways for the radon migration from soil to air. From the 2007 we developed two real-time multiparametric, fully automated stations where the measurements of radon activity, acquired every 15 minutes, are correlated with the soil temperature and atmospheric pressure data. The first results show the important role of the atmospheric factors (e.g. soil temperature) in the acquired radon measurements.

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“…The aim of such a procedure is to establish an empirical relationship between the detector sensitivity, S=v t /v g (where v t and v g are the etching velocities along the track and in the bulk material, respectively) and the particle residual range [1]. Although we largely used and calibrated this type of detector in the past [10], for this repetition experiment we wanted to use a calibration specifically performed for a glass of the same batch used for the experiment. This was achieved by irradiating a few glass samples by means of 18 MeV 12 C beam of the XTU Tandem of Laboratori Nazionali di Legnaro, Italy.…”

Section: The Track Detectors Experimentsmentioning

confidence: 99%

New measurement of exotic decay of 225Ac by 14C emission

et al. 2001

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The branching ratio of 225 Ac decay by emission of 14 C was remeasured under improved experimental conditions by using a radioactive source produced at the ISOLDE mass-separator at CERN and a nuclear track detector technique. The result, B=λ 14C /λ α = (4.5±1.4) 10 -12 , is consistent with the anomalously high value obtained in the 1993 experiment thus confirming the importance of nuclear structure effects in this exotic decay.Pacs: 23.70. +j

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Neon radioactivity of uranium isotopes

Cited by 58 publications

References 10 publications

Microscopic description of cluster radioactivity in actinide nuclei

Microscopic description of cluster radioactivity in actinide nuclei

Insights on radon survey at the Stromboli volcano

New measurement of exotic decay of 225Ac by 14C emission

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