Effect of initial 3α cluster configurations in C12 on the direct decay of its Hoyle state

2021 ◽  
Vol 104 (2) ◽  
Author(s):  
Abhijit Baishya ◽  
S. Santra ◽  
A. Pal ◽  
P. C. Rout
Keyword(s):  
Hoyle State ◽  
Direct Decay

scholarly journals Almost medium-free measurement of the Hoyle state direct-decay component with a TPC

2020 ◽  
Vol 102 (4) ◽  
Author(s):  
J. Bishop ◽  
G. V. Rogachev ◽  
S. Ahn ◽  
E. Aboud ◽  
M. Barbui ◽  
...  
Keyword(s):  
Hoyle State ◽  
Decay Component ◽  
Direct Decay

scholarly journals The α-decay of the Hoyle state in 12C: a new high-precision investigation

2018 ◽  
Vol 184 ◽  
pp. 01005 ◽  
Author(s):  
D. Dell‘Aquila ◽  
I. Lombardo ◽  
G. Verde ◽  
M. Vigilante ◽  
L. Acosta ◽  
...  
Keyword(s):  
Nuclear Physics ◽  
Reaction Rate ◽  
Previous Experiment ◽  
Light Nuclei ◽  
Hoyle State ◽  
Α Decay ◽  
Total Absence ◽  
Decay Component ◽  
Direct Decay ◽  
Bose Einstein

The αdecay path of the Hoyle state in 12C (Ex = 7:654MeV) represents one ofthe most challenging questions of modern nuclear physics. Its knowledge can help in theunderstanding of cluster configurations in light nuclei and the possible existence of Bose-Einstein condensates in nuclei. In stars, it is involved in the so-called 3αprocess, wherethe 12C nucleosynthesis occurs. We studied the 14N(d; α2)12C(7:654) reaction at 10:5MeVincident energy to probe its direct decay component. We found, with a precision higherof a factor 5 than any other previous experiment, an almost total absence of direct decaysby-passing the ground state of 8Be. From our analysis, a new upper limit of such decayis found at 0:043% (95% C.L.). Astrophysical 3α process reaction rate calculations haveto be accordingly revised.

Spin-orbit splittings in 13C and 13N with the nature of the Hoyle state in 12C

2006 ◽  
Vol 21 (31n33) ◽  
pp. 2373-2382 ◽  
Author(s):  
Taiichi YAMADA ◽  
Hisashi HORIUCHI ◽  
Peter SCHUCK
Keyword(s):  
Ground State ◽  
Positive Parity ◽  
Spin Orbit ◽  
Hoyle State ◽  
Valence Nucleon

The spin-orbit splittings of 13 C and 13 N corresponding to the ground state and second 0+ state (Hoyle state) in 12 C are investigated within a 12 C +N model. The agreement of the calculated results with experiments suggests that the [Formula: see text] and [Formula: see text] states around Ex = 9 ~ 10 MeV in 13 C and 13 N can be interpreted as the spin-orbit partner with the [Formula: see text] configuration. We also discuss the positive parity states (including [Formula: see text]) of 13 C and 13 N around the [Formula: see text] threshold, indicating to have the configuration of the Hoyle state in 12 C plus a valence nucleon in sd shell.

scholarly journals New Measurement of the Direct 3α Decay from the C12 Hoyle State

2017 ◽  
Vol 119 (13) ◽  
Author(s):  
R. Smith ◽  
Tz. Kokalova ◽  
C. Wheldon ◽  
J. E. Bishop ◽  
M. Freer ◽  
...  
Keyword(s):  
Hoyle State

scholarly journals Missing monopole strength of the Hoyle state in the alpha inelastic scattering

2014 ◽  
Vol 569 ◽  
pp. 012014 ◽  
Author(s):  
T Kawabata ◽  
T Kadoya ◽  
N Yokota ◽  
S Adachi ◽  
T Baba ◽  
...  
Keyword(s):  
Inelastic Scattering ◽  
Hoyle State

scholarly journals Wigner SU(4) symmetry, clustering, and the spectrum of $$^{12}$$C

2021 ◽  
Vol 57 (9) ◽  
Author(s):  
Shihang Shen ◽  
Timo A. Lähde ◽  
Dean Lee ◽  
Ulf-G. Meißner
Keyword(s):  
Excited States ◽  
Ground State ◽  
Nucleon Nucleon ◽  
Irreducible Representations ◽  
Spin Orbit ◽  
Hoyle State ◽  
Nucleon Interaction ◽  
Model Calculations ◽  
Nucleon Nucleon Interaction ◽  
Spin Orbit Interactions

AbstractWe present lattice calculations of the low-lying spectrum of $$^{12}$$ 12 C using a simple nucleon–nucleon interaction that is independent of spin and isospin and therefore invariant under Wigner’s SU(4) symmetry. We find strong signals for all excited states up to $$\sim 15$$ ∼ 15  MeV above the ground state, and explore the structure of each state using a large variety of $$\alpha $$ α cluster and harmonic oscillator trial states, projected onto given irreducible representations of the cubic group. We are able to verify earlier findings for the $$\alpha $$ α clustering in the Hoyle state and the second $$2^+$$ 2 + state of $$^{12}$$ 12 C. The success of these calculations to describe the full low-lying energy spectrum using spin-independent interactions suggest that either the spin-orbit interactions are somewhat weak in the $$^{12}$$ 12 C system, or the effects of $$\alpha $$ α clustering are diminishing their influence. This is in agreement with previous findings from ab initio shell model calculations.

Monte Carlo modeling of production of three alpha-particles in low energy n +12C interactions

2021 ◽  
Vol 36 (25) ◽  
pp. 2150182
Author(s):  
Khusniddin K. Olimov ◽  
Vladimir V. Lugovoi ◽  
Kosim Olimov ◽  
Maratbek Shodmonov ◽  
Kadyr G. Gulamov ◽  
...  
Keyword(s):  
Experimental Data ◽  
Monte Carlo ◽  
Monte Carlo Model ◽  
Three Dimensional ◽  
Alpha Particles ◽  
Incident Neutron ◽  
Excitation Energies ◽  
Collision Event ◽  
Direct Decay ◽  
Calculation Results

To describe [Formula: see text] interactions with production of three [Formula: see text]-particles at incident neutron kinetic energy of 14 MeV in a nuclear (photo) emulsion, a Monte Carlo model is proposed for four channels of decay of an excited carbon-12 nucleus into three [Formula: see text]-particles. The Monte Carlo calculation results describe well the experimental data on the distribution of the angle between the three-dimensional momenta of all pairs of [Formula: see text]-particles in a collision event, on the distribution of the angle between the projections of the momentum vectors of all pairs of [Formula: see text]-particles in collision event on each of the coordinate planes, on the distribution of the sum of the kinetic energies of all pairs of [Formula: see text]-particles in a collision event, and the distribution of projections of the momenta of [Formula: see text]-particles on the coordinate planes. The best agreement of the Monte Carlo model results with the experimental data is achieved if the direct decay [Formula: see text] and decay through the formation of an intermediate beryllium nucleus [Formula: see text] are generated with equal probabilities, while the excitation energies of 3.04 MeV, 1.04 MeV, and 0.1 MeV for the beryllium nucleus are generated with relative weights of 75%, 15%, and 10%, respectively.

scholarly journals The 2+excitation of the Hoyle state

2016 ◽  
Vol 107 ◽  
pp. 09001
Author(s):  
Dao T. Khoa ◽  
Do Cong Cuong ◽  
Yoshiko Kanada-En’yo
Keyword(s):  
Hoyle State
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