Beta-delayed two-proton decay of39Ti

Moltz, D. M.; Batchelder, J. C.; Lang, Thomas; Ognibene, T. J.; Cerny, Joseph; Haustein, P.E.; Reeder, P.L.

doi:10.1007/bf01291509

Cited by 31 publications

(11 citation statements)

References 16 publications

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“…The limited statistics of the present work as well as of the work from Détraz et al [17] and Moltz et al [18] does not allow for a detailed comparison of the energy spectra. However, from the proton spectrum in figure 3a, it seems to be likely that the peak at (4880 ± 40) keV (marked as This energy is 130 keV higher than in the work of Moltz et al [18] and leads to an excitation energy of the isobaric analogue state (IAS) in 39 Sc of (8.96 ± 0.06) MeV.…”

Section: The Decay Of 39 Timentioning

confidence: 64%

“…However, from the proton spectrum in figure 3a, it seems to be likely that the peak at (4880 ± 40) keV (marked as This energy is 130 keV higher than in the work of Moltz et al [18] and leads to an excitation energy of the isobaric analogue state (IAS) in 39 Sc of (8.96 ± 0.06) MeV. From this result, we deduce a mass excess for this analog state of ∆m = (−5210 ± 85) keV.…”

Section: The Decay Of 39 Timentioning

confidence: 65%

“…The nucleus studied in most detail prior to our experiment is 40 Ti [15,16] which will be used as a reference for calibration. For 39 Ti, the half-life and the main decay branches, including the β2p decay, have been observed previously [17,18]. Some information, like rough lifetime estimates and a few delayed proton lines, is also available for 43 Cr, 46 Mn and 46,47 Fe [19].…”

Section: Introductionmentioning

confidence: 86%

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

et al. 2001

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Abstract. Decay studies of very neutron-deficient nuclei ranging from 39 Ti to 49 Ni have been performed during a projectile fragmentation experiment at the GANIL/LISE3 separator. For all nuclei studied in this work, 39,40 Ti, 42,43 Cr, 46 Mn, 45,46,47 Fe and 49 Ni, half-lives and decay spectra have been measured. In a few cases, γ coincidence measurements helped to successfully identify the initial and final states of transitions. In these cases, partial decay scheme are proposed. For the most exotic isotopes, 39 Ti, 42 Cr, 45 Fe and 49 Ni, which are candidates for two-proton radioactivity from the ground state, no clear evidence of this process is seen in our spectra and we conclude rather on a delayed particle decay.

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Section: The Decay Of 39 Timentioning

confidence: 64%

Section: The Decay Of 39 Timentioning

confidence: 65%

Section: Introductionmentioning

confidence: 86%

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

et al. 2001

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“…However, for some nuclei at the drip line, even more exotic decay branches are possible. After the first observation of β-delayed two-proton emission for 22 Al [2], 6 more β2p emitters have been found: 26 P [3], 35 Ca [4], 31 Ar [5], 27 S [6], 39 Ti [7], and 43 Cr [8]. For 31 Ar, a β-delayed three-proton emission has been reported [9a] D. Bazin et al.…”

Section: Introductionmentioning

confidence: 97%

Spectroscopic studies of the βp and β2p decay of 23Si

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Andriamonje

et al. 1997

Z Phys A - Particles and Fields

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23 Si isotopes have been produced as projectile fragments of a 36 Ar primary beam at 95 MeV/nucleon at the LISE3 spectrometer of GANIL. After implantation in a detector telescope, β-delayed one-proton and β-delayed two-proton emission has been observed. The main one-proton peaks are at (1.32±0.04)MeV, (2.40±0.04)MeV, and (2.83±0.06)MeV. The total decay energy for the β2p decay is (6.18±0.10)MeV for the decay to the ground state and (5.86±0.10)MeV for the decay to the first excited state in the daughter nucleus. However, energetically possible decays via βpα and β3p emission have not been identified. The spectra allowed us to determine the excitation energy of the isobaric analogue state in 23 Al. This enabled us to calculate the coefficients of the T = 5/2 isobaric multiplet mass equation for A = 23. The mass excess of the 23 Si ground state was deduced. This value is compared to different theoretical predictions. Additionally, we determined the branching ratios for the different decay branches. A halflife measurement yielded T 1/2 = (40.7±0.4)ms.

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“…Though two separate gas ∆E -E proton identifications had been planned for each event of interest to further reduce the beta-particle background [12], these 3 He measurements showed that there were problems with the gas gains of the ∆E1 detectors, so that only a single identification of protons using the gas ∆E2 -(Si) E coincidences was utilized. (However, the quality of the gas ∆E2 -(Si) E identifications alone was quite good and was similar to that shown in Figure 3d of [14] for many of the telescopes. )…”

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confidence: 78%

Reinvestigation of the Direct Two-Proton Decay of the Long-Lived IsomerAgm94[0.4 s, 6.7 MeV, (21+)]

et al. 2009

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An attempt to confirm the reported direct one-proton and two-proton decays of the (21+) isomer at 6.7(5) MeV in 94 Ag has been made. The 0.39(4) s half-life of the isomer permitted use of a helium-jet system to transport reaction products from the 40 Ca + nat Ni reaction at 197 MeV to a low-background area; 24 gas ∆E-(Si) E detector telescopes were used to identify emitted protons down to 0.4 MeV. No evidence was obtained for two-proton radioactivity with a summed energy of 1.9(1) MeV and a branching ratio of 0.5(3)%. Two groups of one-proton radioactivity from this isomer had also been reported; our data confirm the lower energy group at 0.79(3) MeV with its branching ratio of 1.9(5)%.

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Beta-delayed two-proton decay of39Ti

Cited by 31 publications

References 16 publications

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

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

Spectroscopic studies of the βp and β2p decay of 23Si

Reinvestigation of the Direct Two-Proton Decay of the Long-Lived IsomerAgm94[0.4 s, 6.7 MeV, (21+)]

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