Evidence for 15O + α resonance structures in 19Ne via direct measurement

被引：30

作者：

Torresi, D. ^{[1
,2
,3
]}

Wheldon, C. ^{[1
]}

Kokalova, Tz. ^{[1
]}

Bailey, S. ^{[1
]}

Boiano, A. ^{[4
]}

Boiano, C. ^{[5
]}

Fisichella, M. ^{[2
]}

Mazzocco, M. ^{[6
,7
]}

Parascandolo, C. ^{[4
]}

Pierroutsakou, D. ^{[4
]}

Strano, E. ^{[6
,7
]}

Zadro, M. ^{[8
]}

Cavallaro, M. ^{[2
]}

Cherubini, S. ^{[2
,3
]}

Curtis, N. ^{[1
]}

Di Pietro, A. ^{[2
]}

Fernandez-Garcia, J. P. ^{[2
]}

Figuera, P. ^{[2
]}

Glodariu, T. ^{[9
]}

Grebosz, J. ^{[10
]}

La Cognata, M. ^{[2
]}

La Commara, M. ^{[4
]}

Lattuada, M. ^{[2
,3
]}

Mengoni, D. ^{[11
]}

Pizzone, R. G. ^{[2
,7
]}

Signorini, C. ^{[11
]}

Stefanini, C. ^{[6
]}

Stroe, L. ^{[9
]}

Spitaleri, C. ^{[2
,3
]}

机构：

[1] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England

[2] Ist Nazl Fis Nucl, Lab Nazl Sud, Via S Sofia 62, Catania, Italy

[3] Univ Catania, Dipartimento Fis & Astron, Via S Sofia 64, I-95123 Catania, Italy

[4] Ist Nazl Fis Nucl, Sez Napoli, Via Cinthia, I-80126 Naples, Italy

[5] Ist Nazl Fis Nucl, Sez Milano, Via Celoria 16, I-20133 Milan, Italy

[6] Ist Nazl Fis Nucl, Sez Padova, Via F Marzolo 8, I-35131 Padua, Italy

[7] Univ Padua, Dipartimento Fis & Astron, Via F Marzolo 8, I-35131 Padua, Italy

[8] Rudjer Boskovic Inst, Bijenicka Cesta 54, Zagreb 10000, Croatia

[9] NIPNE IFIN HH, 30 Reactorului St, Magurele 077125, Romania

[10] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland

[11] Ist Nazl Fis Nucl, Lab Nazl Legnaro, Viale Univ 2, I-35020 Legnaro, Italy

来源：

PHYSICAL REVIEW C | 2017年 / 96卷 / 04期

关键词：

EXOTIC BEAM-LINE; ENERGY-LEVELS; LIGHT; STATES; GAS; SCATTERING; BANDS;

D O I：

10.1103/PhysRevC.96.044317

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：

States in the astrophysically important Ne-19 nucleus have been populated directly using the O-15(alpha, alpha) O-15 reaction with a radioactive O-15 beam. Due to the challenges involved, this represents the first such O-15 measurement with high resolution and the first dedicated to exploring the cluster structure. This measurement comprises three experiments: the first to develop the O-15 radioactive beam, the second the resonant scattering study, and the third to measure the precise energy loss of O ions in He-4 to reduce systematic uncertainties. The results show evidence for O-15 + alpha cluster structure which could explain earlier results pointing to the increased alpha branching ratio in the astrophysical reaction rate for high-spin near-threshold resonances. Absolute differential cross sections have been measured. Additionally, spins, parities, and partial decay widths, essential for nuclear reaction-rate calculations, have been extracted using an R-matrix analysis.

引用

页数：7

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