Search for rare 3-α decays in the region of the Hoyle state of 12C

被引：19

作者：

Cardella, G. ^{[1
]}

Bonasera, A. ^{[2
,3
]}

Martorana, N. S. ^{[2
,4
]}

Acosta, L. ^{[1
,5
]}

De Filippo, E. ^{[1
]}

Geraci, E. ^{[1
,4
]}

Gnoffo, B. ^{[1
,4
]}

Guazzoni, C. ^{[6
,7
]}

Lo Monaco, L. ^{[4
]}

Maiolino, C. ^{[2
]}

Pagano, A. ^{[1
]}

Pagano, E., V ^{[2
]}

Papa, M. ^{[1
]}

Pirrone, S. ^{[1
]}

Politi, G. ^{[1
,4
]}

Risitano, F. ^{[1
,8
]}

Rizzo, F. ^{[2
,4
]}

Russotto, P. ^{[2
]}

Trimarchi, M. ^{[1
,8
]}

机构：

[1] Ist Nazl Fis Nucl, Sez Catania, Catania, Italy

[2] INFN LNS, Catania, Italy

[3] Texas A&M Univ, Cyclotron Inst, College Stn, TX USA

[4] Univ Catania, Dipartimento Fis & Astron Ettore Majorana, Catania, Italy

[5] Univ Nacl Autonoma Mexico, Inst Fis, Mexico City, DF, Mexico

[6] Politecn Milan, DEIB, Milan, Italy

[7] Ist Nazl Fis Nucl, Sez Milano, Milan, Italy

[8] Univ Messina, Dipartimento Sci MIFT, Messina, Italy

来源：

NUCLEAR PHYSICS A | 2022年 / 1020卷

关键词：

Hoyle state; Efimov state; Alpha scattering; ENERGY-LEVELS; NUCLEI;

D O I：

10.1016/j.nuclphysa.2022.122395

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

We performed a refined analysis of the data collected with the CHIMERA detector with the aim of searching rare 3-alpha decay modes near the Hoyle state of 12C. In particular we investigated the direct and sequential decay modes of the Hoyle state including also the recently suggested Efimov state. The comparison of selected events with simulations constrains the precision achievable with measurements in different experimental conditions. We observe good sensitivities to different decay scenarios also in the CHIMERA spherical region notwithstanding its limited angular resolution. The search for the decay of the Efimov state in 12C was performed by using new selection strategies as suggested by simulations. The obtained results are not conclusive, however, we are able to exclude the presence of a sequential decay of this state, while our data could be compatible with its direct decay. (c) 2022 Elsevier B.V. All rights reserved.

引用

页数：13

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