Decay of proton-rich nuclei between 39Ti and 49Ni

Giovinazzo, J.; Blank, Β.; Borcea, C.; Chartier, M.; Czájkowski, S.; Grzywacz, R.; Janas, Z.; Lewitowicz, M.; Santos, F. de Oliveira; Pfützner, M.; Pravikoff, M.S.; Thomas, J. C.

doi:10.1007/s100500170146

Cited by 41 publications

(28 citation statements)

References 27 publications

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“…2(b) conditioned by a decay time in the interval between 15 and 100 ms, the 1.14 MeV peak has almost completely disappeared and other events higher in decay energy show up. These counts are consistent with the decay-energy spectrum of 43 Cr [15], the 2p daughter of 45 Fe. The 1.14 MeV peak, however, seems to originate only from the fast decay of 45 Fe.…”

supporting

confidence: 84%

“…The observation of a pronounced peak at 1.14 MeV from the decay of 45 Fe is a strong additional indication that 45 Fe is not decaying by a -delayed mode alone as does 46 Fe [15] with a more complex decay-energy spectrum. In addition, the width of the 45 Fe peak (60 10 keV) is about 40% smaller than -delayed one-proton peaks from neighboring nuclei.…”

mentioning

confidence: 88%

“…In addition, part of the decay strength of 45 Fe was observed [15] in the experiment designed to identify for the first time 48 Ni [14]. However, due to the setup of the electronics in this experiment, two-proton events triggered the data acquisition only with a very low probability (five possible events at about 1.1 MeV [15]). …”

mentioning

confidence: 97%

“…The fragments of interest were stopped in the third silicon detector of the telescope and identified on an event-by-event basis by means of their flight times and of their energy loss in all detectors of the telescope (see [14,15]). The position distribution had a FWHM of about 24 mm in x and y. Implantation events were triggered by detectors E1 and E2, whereas radioactive decay events were triggered either by the detector E3 or by the adjacent silicon detector E4.…”

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confidence: 99%

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Two-Proton Radioactivity ofF45e

et al. 2002

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In an experiment at the SISSI-LISE3 facility of GANIL, the decay of the proton drip line nucleus 45Fe has been studied. Fragment-implantation events have been correlated with radioactive decay events in a 16x16 pixel silicon-strip detector. The decay-energy spectrum of 45Fe implants shows a distinct peak at (1.14+/-0.04) MeV with a half-life of T(1/2)=(4.7(+3.4)(-1.4)) ms. None of the events in this peak is in coincidence with beta particles. For a longer correlation interval, daughter decays of the two-proton daughter 43Cr can be observed after 45Fe implantation. The decay energy for 45Fe agrees nicely with several theoretical predictions for two-proton radioactivity.

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confidence: 84%

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confidence: 88%

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confidence: 97%

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confidence: 99%

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Two-Proton Radioactivity ofF45e

et al. 2002

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“…The recent observation of two-proton radioactivity of 45 Fe [6,7] confirmed these predictions nicely. In other experiments, less promising candidates like 42 Cr, and 49 Ni could be shown to decay by β-delayed processes [8]. Beyond 45 Fe, 48 Ni and 54 Zn were regarded as possible candidates to exhibit two-proton radioactivity.…”

Section: The Nucleusmentioning

confidence: 99%

First Observation ofZn54and its Decay by Two-Proton Emission

et al. 2005

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The nucleus54 Zn has been observed for the first time in an experiment at the SISSI/LISE3 facility of GANIL in the quasi-fragmentation of a 58 Ni beam at 74.5 MeV/nucleon in a nat Ni target. The fragments were analysed by means of the ALPHA-LISE3 separator and implanted in a silicon-strip detector where correlations in space and time between implantation and subsequent decay events allowed us to generate almost background free decay spectra for about 25 different nuclei at the same time. Eight 54 Zn implantation events were observed. From the correlated decay events, the half-life of 54 Zn is determined to be 3.2 +1.8 −0.8 ms. Seven of the eight implantations are followed by two-proton emission with a decay energy of 1.48(2) MeV. The decay energy and the partial halflife are compared to model predictions and allow for a test of these two-proton decay models.PACS numbers: 23.50.+z, 23.90.+w, 21.10.-k, 27.40.+z Our understanding of nuclear structure is mainly based on results obtained with nuclei close to the line of stability. These studies allowed for understanding of the basic structure of the strong interaction which governs the interplay between neutrons and protons in an atomic nucleus. However, these nuclei close to stability cover only a very small range in isospin, i.e. their proton-toneutron ratio is rather similar. With the advent of machines to produce radioactive nuclei, these basic concepts can now be tested with more and more exotic nuclei having a strong imbalance of neutrons and protons.With these exotic nuclei being much further away from stability, also new phenomena appeared. For nuclei beyond the proton drip line, where the strong force can no longer bind all protons, one-and two-proton (2p) radioactivity was predicted more than 40 years ago by Goldanskii [1]. For odd-Z nuclei, one-proton radioactivity was proposed to occur, whereas for medium-and heavy-mass even-Z nuclei the nuclear pairing energy renders one-proton emission impossible. In this case, twoproton emission is to be expected.One-proton radioactivity was observed for the first time about 20 years ago by Hofmann et al. [2]. Twoproton radioactivity was sought for many years without success. This research field experienced a strong boost with the advent of high-intensity projectilefragmentation facilities. At these facilities, experimentalists could for the first time reach the most promising candidates for two-proton radioactivity. According to recent theoretical predictions, proton drip-line nuclei in the A=40-55 region were identified as the most promising candidates [3][4][5]. Zn were regarded as possible candidates to exhibit two-proton radioactivity. In the present letter, we report on the first observation of 54 Zn and its decay by two-proton radioactivity. 54 Zn was produced by quasi-fragmentation reactions of a primary 58 Ni 26+ beam, accelerated to 74.5 MeV/nucleon by the GANIL cyclotrons, which impinged with an average intensity of 4µA on a nat Ni target of thickness 250mg/cm 2 installed in the SISSI device. The fragment...

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Two-proton emission

Pfützner¹

The 4th International Conference on Exotic Nuclei and Atomic Masses

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Decay of proton-rich nuclei between 39Ti and 49Ni

Cited by 41 publications

References 27 publications

Two-Proton Radioactivity ofF45e

Two-Proton Radioactivity ofF45e

First Observation ofZn54and its Decay by Two-Proton Emission

Two-proton emission

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