Nuclear Threshold States: Yesterday, Today, Tomorrow

Journal Article · Fri Apr 30 00:00:00 EDT 2010 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.3431403· OSTI ID:21367155

Ogloblin, A A; Danilov, A N; Demyanova, A S ^[1]; Belyaeva, T L ^[2]; Goncharov, S A ^[3]

---

1. Kurchatov Institute, Moscow (Russian Federation)
2. Universidad Autonoma del Estado de Mexico, Toluca (Mexico)
3. Scobeltzin Institute, Moscow (Russian Federation)

50 years ago exotic nuclear states with abnormally large radii located close to the thresholds of emission of nucleons or clusters were predicted. Recently a hypothesis of possible existence of alpha-particle Bose condensation was proposed. The 0{sup +}{sub 2}(7.65 MeV) state of {sup 12}C(so-called Hoyle state) is considered to be the prototype of such condensed state and have a dilute structure. We propose two methods for searching the alpha-condensate signatures in the Hoyle state and some other ones near the alpha-thresholds by using inelastic diffractive and rainbow scattering. Inelastic scattering of {sup 2}H, {sup 3}He, {sup 4}He, {sup 6}Li, and {sup 12}C on {sup 12}C was studied and the enhancement of the {sup 12}C radius in the Hoyle state relatively the ground state radius by a factor of 1.2 was demonstrated. Another signature of the condensate structure, 70% probability of all three alpha-particles to be in the s-state, was observed for the Hoyle state by studying the {sup 8}Be transfer reaction. The analogs of the Hoyle state with enhanced radii were identified in {sup 11}B and {sup 13}C. The proposed methods of measuring the nuclear radii allowed observation of neutron halos in the excited states of {sup 9}Be and {sup 13}C. The conception of abnormal dimensions of the threshold states finds its confirmation in many nuclear phenomena both well-known and new ones. One of the perspective domains of its manifestation are the nuclei heavier than {sup 100}Sn with N = Z, which are able to emit several alpha particles.

• OSTI ID: 21367155
• Journal Information: AIP Conference Proceedings, Vol. 1224, Issue 1; Conference: International symposium on exotic nuclei, Sochi (Russian Federation), 28 Sep - 2 Oct 2009; Other Information: DOI: 10.1063/1.3431403; (c) 2010 American Institute of Physics; ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALPHA DECAY
ALPHA PARTICLES
BERYLLIUM 8
BERYLLIUM 9
BORON 11
CARBON 12
CARBON 13
EXCITED STATES
GROUND STATES
HELIUM 3
HELIUM 4
INELASTIC SCATTERING
LITHIUM 6
NUCLEAR HALOS
NUCLEAR MODELS
NUCLEAR RADII
NUCLEAR STRUCTURE
S STATES
TIN 100
TRANSFER REACTIONS
ALKALINE EARTH ISOTOPES
ALPHA DECAY RADIOISOTOPES
BERYLLIUM ISOTOPES
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BORON ISOTOPES
CARBON ISOTOPES
CHARGED PARTICLES
DECAY
DIRECT REACTIONS
ELECTRON CAPTURE RADIOISOTOPES
ENERGY LEVELS
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
HELIUM ISOTOPES
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOTOPES
LIGHT NUCLEI
LITHIUM ISOTOPES
MATHEMATICAL MODELS
NUCLEAR DECAY
NUCLEAR PROPERTIES
NUCLEAR REACTIONS
NUCLEI
ODD-EVEN NUCLEI
ODD-ODD NUCLEI
RADIATIONS
RADIOISOTOPES
SCATTERING
STABLE ISOTOPES
TIN ISOTOPES