Particle decay of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Be</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>12</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>excited states

Charity, R. J.; Komarov, Sergey; Sobotka, L. G.; Clifford, J.R.; Bazin, D.; Gade, A.; Lee, Jenny; Lynch, W. G.; Mocko, M.; Lobastov, S. P.; Rogers, A. M.; Sanetullaev, A.; Tsang, M. B.; Wallace, Mark; Hudan, S.; Metelko, C.; Famiano, M.; Wuosmaa, A. H.; Goethem, van Marc-Jan

doi:10.1103/physrevc.76.064313

Cited by 38 publications

(52 citation statements)

References 24 publications

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“…A broad peak is observed at 22.96 MeV. Such a peak was also observed previously following the fragmentation of a 12 Be beam and was associated with proton decay to the 4.63-MeV J π =7/2 − 7 Li excited state [13]. This is confirmed in the present work.…”

Section: Dsupporting

confidence: 80%

“…These effects have been extensively studied using Monte Carlo simulations that include the angular acceptance and the angular and energy resolutions of the detectors, the energy loss [11] and small-angle scattering [12] of the fragments as they leave the target, and the beam-spot size. These simulations have proven quite reliable in past experiments with HiRA [10,13].…”

Section: Simulationsmentioning

confidence: 77%

“…Thus the broad peak in the α-α excitation spectrum in Fig. 21(b) decay character [10], however the two arcs are not separated as the two α particles are located too close together. In both simulations we have determined the emission energies in the two steps using the R-matrix formalism as described in Sec.…”

Section: P+2α Exit Channelmentioning

confidence: 99%

“…The HiRA telescopes have excellent isotope separation for the all of the light fragments of interest in this work and multiple fragments within a single telescope can be identified [10]. The gains for the Si amplifiers were setup for the detection of hydrogen and helium isotopes.…”

Section: Experimental Methodsmentioning

confidence: 99%

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Investigations of three-, four-, and five-particle decay channels of levels in light nuclei created using aC9beam

et al. 2011

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The interactions of a E/A=70-MeV 9 C beam with a Be target was used to populate levels in Be, B, and C isotopes which undergo decay into many-particle exit channels. The decay products were detected in the HiRA array and the level energies were identified from their invariant mass. Correlations between the decay products were examined to deduce the nature of the decays, specifically to what extent all the fragments were created in one prompt step or whether the disintegration proceeded in a sequential fashion through long-lived intermediate states. In the latter case, information on the spin of the level was also obtained. Of particular interest is the 5-body decay of the 8 C ground state which was found to disintegrate in two steps of two-proton decay passing through the 6 Beg.s. intermediate state. The isobaric analog of 8 Cg.s. in 8 B was also found to undergo two-proton decay to the isobaric analog of 6 Beg.s. in 6 Li. A 9.69-MeV state in 10 C was found to undergo prompt 4-body decay to the 2p+2α exit channel. The two protons were found to have a strong enhancement in the diproton region and the relative energies of all four p-α pairs were consistent with the 5 Lig.s. resonance.

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Section: Dsupporting

confidence: 80%

Section: Simulationsmentioning

confidence: 77%

Section: P+2α Exit Channelmentioning

confidence: 99%

Section: Experimental Methodsmentioning

confidence: 99%

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Investigations of three-, four-, and five-particle decay channels of levels in light nuclei created using aC9beam

et al. 2011

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“…The mass excesses for the quintet are listed in Table II [30]. As in this work, "calibration" peaks were found to ascertain the systematic error which dominates the final uncertainty.…”

Section: Introductionmentioning

confidence: 67%

Two-proton decay of12O and its isobaric analog state in12N

et al. 2012

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Following neutron knockout from a 13 O beam, 12 O fragments were created and the three decay products following two-proton decay were detected. A new ground-state mass was determined by the invariant mass method implying a decay kinetic energy of 1.638(24) MeV, and the width was found to be less than 72 keV. The latter is inconsistent with previous measurements with lower experimental resolutions, but consistent with theoretical estimates. The isobaric analog of 12 O in 12 N was produced from proton knockout reactions with the same beam and decayed by twoproton emission to the isobaric analog state in 10 B with a decay kinetic energy of 1.165(29) MeV. It represents only the second case of an analog state where two-proton decay is the only isospin and energy conserving particle decay mode. With our measurements of the mass excesses of 12 O and it analog, the quadratic form of the isobaric multiplet mass equation was found to fit the A=12 quintet and any deviations are less than the magnitude found for the A=8 quintet and A=7 and 9 quartets.

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