A new experimental study of the<sup>12</sup>Be cluster structure

Yang, Z.; Ye, Y. L.

doi:10.1051/epjconf/20146602112

Cited by 3 publications

(10 citation statements)

References 27 publications

(41 reference statements)

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“…4), two peaks at 11.7 and 13.3 MeV are clearly observed. The width (FWHM) of each peak is about 1 MeV, consistent with the simulated resolution of about 0.8 MeV [43]. The 13.3-MeV state agrees with the 13.2-MeV state reported by Freer et al, which was assigned a spin-parity value of 4 + based on an angular correlation analysis [33].…”

Section: He + 6 He Channelsupporting

confidence: 89%

“…1(a) in Ref. [43]). From a least-square fitting, a width of 1.5(2) MeV is extracted for the 10.3-MeV peak, which characterizes its excitation and decay properties [17].…”

Section: He + 8 He Channelmentioning

confidence: 94%

“…The simulation takes into account the reaction position and energy loss in the target, and the energy and position resolutions of the detectors. For 12 Be decaying into the 6 He + 6 He and 4 He + 8 He channels, the resolution (FWHM) is determined to be around 0.4 MeV at a relative energy (E rel ) of 1 MeV and increases to about 0.8 MeV at an E rel of 4 MeV [43], mainly attributed to the uncertainty of the interaction depth in the target. The detection efficiency is mainly limited by the configuration of the CsI(Tl) scintillator array.…”

Section: Methodsmentioning

confidence: 99%

“…1(a) in Ref. [43]) and filtered by the acceptance (Fig. 2) before being used in the fitting procedure.…”

Section: He + 8 He Channelmentioning

confidence: 99%

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Helium-helium clustering states inBe12

Yang¹,

Ye²,

Li³

et al. 2015

Phys. Rev. C

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An inelastic excitation experiment was performed with a 12 Be beam at 29 MeV/u on a carbon target. New resonances close to the respective cluster separation thresholds were observed in 12 Be for the 4 He + 8 He and 6 He + 6 He decay channels, confirming the previously proposed molecular rotational bands. Using the model-independent angular correlation analysis, a 0 + spin parity is assigned to the remarkably large peak at 10.3 MeV in the 4 He + 8 He channel. A distorted wave Born approximation (DWBA) calculation was compared to the experimental differential cross section of this state, resulting in a largely enhanced monopole transition matrix element of 7.0 ± 1.0 fm 2 , in good agreement with the generalized two-center cluster model (GTCM) prediction assuming a preformed α-4n-α configuration. Together with the previously reported large cluster spectroscopic factor, the strong clustering in 12 Be is well demonstrated. The detection focused on the most forward angles, by using a zero-deg telescope, is essential in the present measurement.

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Section: He + 6 He Channelsupporting

confidence: 89%

“…1(a) in Ref. [43]). From a least-square fitting, a width of 1.5(2) MeV is extracted for the 10.3-MeV peak, which characterizes its excitation and decay properties [17].…”

Section: He + 8 He Channelmentioning

confidence: 94%

Section: Methodsmentioning

confidence: 99%

“…1(a) in Ref. [43]) and filtered by the acceptance (Fig. 2) before being used in the fitting procedure.…”

Section: He + 8 He Channelmentioning

confidence: 99%

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Helium-helium clustering states inBe12

Yang¹,

Ye²,

Li³

et al. 2015

Phys. Rev. C

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“…Particle identification (PID) for these multiplicity-2 events, composed of mostly 4 He, 6 He, and 8 He isotopes, is excellent and was illustrated in Refs. [23,24]. It is worth noting that the accompanying reaction mechanisms, such as 12 Cð 12 Be; 8 HeÞ 16 O Ã , can be neglected because our kinematics would correspond to the population and alpha decay of the states in 16 O with excitation energies over 50 MeV.…”

mentioning

confidence: 99%

Observation of Enhanced Monopole Strength and Clustering inBe12

Yang¹,

Ye²,

Li³

et al. 2014

Phys. Rev. Lett.

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In a recent breakup-reaction experiment using a Be12 beam at 29 MeV/nucleon, the 0+ band head of the expected He4+He8 molecular rotation was clearly identified at about 10.3 MeV, from which a large monopole matrix element of 7.0±1.0 fm2 and a large cluster-decay width were determined for the first time. These findings support the picture of strong clustering in Be12, which has been a subject of intense investigations over the past decade. The results were obtained thanks to a specially arranged detection system around zero degrees, which is essential in determining the newly emphasized monopole strengths to signal the cluster formation in a nucleus.

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