First direct limit on the 334 keV resonance strength in 22Ne(α, γ)26Mg reaction

被引：14

作者：

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

Masha, E. ^{[4
,5
]}

Aliotta, M. ^{[6
]}

Balibrea-Correa, J. ^{[7
]}

Barile, F. ^{[14
,15
]}

Bemmerer, D. ^{[3
]}

Best, A. ^{[7
,8
]}

Boeltzig, A. ^{[9
,10
]}

Broggini, C. ^{[1
]}

Bruno, C. G. ^{[6
]}

Caciolli, A. ^{[1
,2
]}

Cavanna, F. ^{[11
]}

Chillery, T. ^{[6
]}

Ciani, G. F. ^{[9
,10
]}

Compagnucci, A. ^{[1
,2
]}

Corvisiero, P. ^{[12
,13
]}

Csedreki, L. ^{[9
,10
,16
]}

Davinson, T. ^{[6
]}

Depalo, R. ^{[1
,2
]}

di Leva, A. ^{[7
,8
]}

Elekes, Z. ^{[16
]}

Ferraro, F. ^{[12
,13
]}

Fiore, E. M. ^{[14
,15
]}

Formicola, A. ^{[9
,10
]}

Fulop, Zs ^{[16
]}

Gervino, G. ^{[11
,17
]}

Guglielmetti, A. ^{[4
,5
]}

Gustavino, C. ^{[18
]}

Gyurky, Gy ^{[16
]}

Imbriani, G. ^{[7
,8
]}

Junker, M. ^{[9
,10
]}

Lugaro, M. ^{[19
,20
]}

Marigo, P. ^{[1
,2
]}

Menegazzo, R. ^{[1
]}

Mossa, V ^{[14
,15
]}

Pantaleo, F. R. ^{[14
,15
]}

Paticchio, V ^{[15
]}

Perrino, R. ^{[15
]}

Prati, P. ^{[12
,13
]}

Rapagnani, D. ^{[7
]}

Schiavulli, L. ^{[14
,15
]}

Skowronski, J. ^{[1
,2
]}

Stockel, K. ^{[3
,21
]}

Straniero, O. ^{[9
,22
]}

Szucs, T. ^{[3
]}

Takacs, M. P. ^{[3
,21
,23
]}

Zavatarelli, S. ^{[13
]}

机构：

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

[2] Univ Padua, Via F Marzolo 8, I-35131 Padua, Italy

[3] Helmholtz Zentmm Dresden Rossendorf, Bautzner Landstr 400, D-01328 Dresden, Germany

[4] Univ Milan, Via G Celoria 16, I-20133 Milan, Italy

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

[6] Univ Edinburgh, Scottish Univ Phys Alliance, Sch Phys & Astron, SUPA, Edinburgh EH9 3FD, Midlothian, Scotland

[7] Univ Napoli Federico II, Dipartimento Fis E Pancini, Via Cintia, I-80126 Naples, Italy

[8] Ist Nazl Fis Nucl, Sez Napoli, Via Cintia, I-80126 Naples, Italy

[9] Gran Sasso Sci Inst, I-67100 Laquila, Italy

[10] Ist Nazl Fis Nucl, Lab Nazl Gran Sasso LNGS, I-67100 Assergi, AQ, Italy

[11] Ist Nazl Fis Nucl, Sez Torino, Via P Giuria 1, I-10125 Tourin, Italy

[12] Univ Genoa, Via Dodecaneso 33, I-16146 Genom, Italy

[13] Ist Nazl Fis Nucl, Sez Genova, Via Dodecaneso 33, I-16146 Genom, Italy

[14] Univ Bari, I-70125 Bari, Italy

[15] Ist Nazl Fis Nucl, Sez Bari, I-70125 Bari, Italy

[16] Inst Nucl Res ATOMKI, POB 51, H-4001 Debrecen, Hungary

[17] Univ Turin, Via P Giuria 1, I-10125 Turin, Italy

[18] Ist Nazl Fis Nucl, Sez Roma, Piazzale A Moro 2, I-00185 Rome, Italy

[19] Hungarian Acad Sci, Res Ctr Astron & Earth Sci, Konkoly Observ, H-1121 Budapest, Hungary

[20] Eotvos Lorand Univ, Inst Phys, Pazmany Peter Setany 1-A, H-1117 Budapest, Hungary

[21] Tech Univ Dresden, Inst Kern & Teilchenphys, Zellescher Weg 19, D-01069 Dresden, Germany

[22] INAF Osservatorio Astron Abruzzo, Via Mentore Maggini, I-64100 Teramo, Italy

[23] Phys Tech Bundesanstalt, Bundesallee 100, D-38116 Braunschweig, Germany

来源：

EUROPEAN PHYSICAL JOURNAL A | 2022年 / 58卷 / 10期

基金：

欧洲研究理事会;

关键词：

GIANT BRANCH STARS; S-PROCESS NUCLEOSYNTHESIS; MG ISOTOPIC-RATIOS; MAGNESIUM ISOTOPES; AGB-STARS; NUCLEAR ASTROPHYSICS; REACTION-RATES; MASSIVE STARS; EVOLUTION; ABUNDANCES;

D O I：

10.1140/epja/s10050-022-00827-2

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：

In stars, the fusion of Ne-22 and He-4 may produce either Mg-25, with the emission of a neutron, or Mg-26 and a gamma ray. At high temperature, the (alpha, n) channel dominates, while at low temperature, it is energetically hampered. The rate of its competitor, the Ne-22(alpha, gamma)Mg-26 reaction, and, hence, the minimum temperature for the (alpha, n) dominance, are controlled by many nuclear resonances. The strengths of these resonances have hitherto been studied only indirectly. The present work aims to directly measure the total strength of the resonance at E-r = 334 keV (corresponding to E-x =10949 keV in Mg-26). The data reported here have been obtained using high intensity He-4(+) beam from the INFN LUNA 400 kV underground accelerator, a windowless, recirculating, 99.9% isotopically enriched Ne-22 gas target, and a 4 pi. bismuth germanate summing gamma-ray detector. The ultra-low background rate of less than 0.5 counts/day was determined using 63 days of no-beam data and 7 days of He-4(+) beam on an inert argon target. The new high-sensitivity setup allowed to determine the first direct upper limit of 4.0 x 10(-11) eV (at 90% confidence level) for the resonance strength. Finally, the sensitivity of this setup paves the way to study further Ne-22(alpha, gamma)Mg-26 resonances at higher energy.

引用

页数：9

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