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Article ; Online: Direct Measurement of the ^{13}C(α,n)^{16}O Cross Section into the s-Process Gamow Peak.

Ciani, G F / Csedreki, L / Rapagnani, D / Aliotta, M / Balibrea-Correa, J / Barile, F / Bemmerer, D / Best, A / Boeltzig, A / Broggini, C / Bruno, C G / Caciolli, A / Cavanna, F / Chillery, T / Colombetti, P / Corvisiero, P / Cristallo, S / Davinson, T / Depalo, R /

Di Leva, A / Elekes, Z / Ferraro, F / Fiore, E / Formicola, A / Fülöp, Zs / Gervino, G / Guglielmetti, A / Gustavino, C / Gyürky, Gy / Imbriani, G / Junker, M / Lugaro, M / Marigo, P / Masha, E / Menegazzo, R / Mossa, V / Pantaleo, F R / Paticchio, V / Perrino, R / Piatti, D / Prati, P / Schiavulli, L / Stöckel, K / Straniero, O / Szücs, T / Takács, M P / Terrasi, F / Vescovi, D / Zavatarelli, S

Physical review letters

2021 Volume 127, Issue 15, Page(s) 152701

Abstract: One of the main neutron sources for the astrophysical s process is the reaction ^{13}C(α,n)^{16}O, taking place in thermally pulsing asymptotic giant branch stars at temperatures around 90 MK. To model the nucleosynthesis during this process the reaction ...

Abstract	One of the main neutron sources for the astrophysical s process is the reaction ^{13}C(α,n)^{16}O, taking place in thermally pulsing asymptotic giant branch stars at temperatures around 90 MK. To model the nucleosynthesis during this process the reaction cross section needs to be known in the 150-230 keV energy window (Gamow peak). At these sub-Coulomb energies, cross section direct measurements are severely affected by the low event rate, making us rely on input from indirect methods and extrapolations from higher-energy direct data. This leads to an uncertainty in the cross section at the relevant energies too high to reliably constrain the nuclear physics input to s-process calculations. We present the results from a new deep-underground measurement of ^{13}C(α,n)^{16}O, covering the energy range 230-300 keV, with drastically reduced uncertainties over previous measurements and for the first time providing data directly inside the s-process Gamow peak. Selected stellar models have been computed to estimate the impact of our revised reaction rate. For stars of nearly solar composition, we find sizeable variations of some isotopes, whose production is influenced by the activation of close-by branching points that are sensitive to the neutron density, in particular, the two radioactive nuclei ^{60}Fe and ^{205}Pb, as well as ^{152}Gd.
Language	English
Publishing date	2021-10-22
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.127.152701
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Article ; Online: Erratum: Three New Low-Energy Resonances in the ^{22}Ne(p,γ)^{23}Na Reaction [Phys. Rev. Lett. 115, 252501 (2015)].

Cavanna, F / Depalo, R / Aliotta, M / Anders, M / Bemmerer, D / Best, A / Boeltzig, A / Broggini, C / Bruno, C G / Caciolli, A / Corvisiero, P / Davinson, T / di Leva, A / Elekes, Z / Ferraro, F / Formicola, A / Fülöp, Zs / Gervino, G / Guglielmetti, A /

Gustavino, C / Gyürky, Gy / Imbriani, G / Junker, M / Menegazzo, R / Mossa, V / Pantaleo, F R / Prati, P / Scott, D A / Somorjai, E / Straniero, O / Strieder, F / Szücs, T / Takács, M P / Trezzi, D

Physical review letters

2018 Volume 120, Issue 23, Page(s) 239901

Abstract: This corrects the article DOI: 10.1103/PhysRevLett.115.252501. ...

Abstract	This corrects the article DOI: 10.1103/PhysRevLett.115.252501.
Language	English
Publishing date	2018-06-22
Publishing country	United States
Document type	Journal Article ; Published Erratum
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.120.239901
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: The baryon density of the Universe from an improved rate of deuterium burning.

Mossa, V / Stöckel, K / Cavanna, F / Ferraro, F / Aliotta, M / Barile, F / Bemmerer, D / Best, A / Boeltzig, A / Broggini, C / Bruno, C G / Caciolli, A / Chillery, T / Ciani, G F / Corvisiero, P / Csedreki, L / Davinson, T / Depalo, R / Di Leva, A /

Elekes, Z / Fiore, E M / Formicola, A / Fülöp, Zs / Gervino, G / Guglielmetti, A / Gustavino, C / Gyürky, G / Imbriani, G / Junker, M / Kievsky, A / Kochanek, I / Lugaro, M / Marcucci, L E / Mangano, G / Marigo, P / Masha, E / Menegazzo, R / Pantaleo, F R / Paticchio, V / Perrino, R / Piatti, D / Pisanti, O / Prati, P / Schiavulli, L / Straniero, O / Szücs, T / Takács, M P / Trezzi, D / Viviani, M / Zavatarelli, S

Nature

2020 Volume 587, Issue 7833, Page(s) 210–213

Abstract: Light elements were produced in the first few minutes of the Universe through a sequence of nuclear reactions known as Big Bang nucleosynthesis (BBN) ...

Abstract	Light elements were produced in the first few minutes of the Universe through a sequence of nuclear reactions known as Big Bang nucleosynthesis (BBN)
Language	English
Publishing date	2020-11-11
Publishing country	England
Document type	Journal Article ; Research Support, Non-U.S. Gov't
ZDB-ID	120714-3
ISSN	1476-4687 ; 0028-0836
ISSN (online)	1476-4687
ISSN	0028-0836
DOI	10.1038/s41586-020-2878-4
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Article ; Online: Improved Direct Measurement of the 64.5 keV Resonance Strength in the ^{17}O(p,α)^{14}N Reaction at LUNA.

Bruno, C G / Scott, D A / Aliotta, M / Formicola, A / Best, A / Boeltzig, A / Bemmerer, D / Broggini, C / Caciolli, A / Cavanna, F / Ciani, G F / Corvisiero, P / Davinson, T / Depalo, R / Di Leva, A / Elekes, Z / Ferraro, F / Fülöp, Zs / Gervino, G /

Guglielmetti, A / Gustavino, C / Gyürky, Gy / Imbriani, G / Junker, M / Menegazzo, R / Mossa, V / Pantaleo, F R / Piatti, D / Prati, P / Somorjai, E / Straniero, O / Strieder, F / Szücs, T / Takács, M P / Trezzi, D

Physical review letters

2016 Volume 117, Issue 14, Page(s) 142502

Abstract: The ^{17}O(p,α)^{14}N reaction plays a key role in various astrophysical scenarios, from asymptotic giant branch stars to classical novae. It affects the synthesis of rare isotopes such as ^{17}O and ^{18}F, which can provide constraints on astrophysical ...

Abstract	The ^{17}O(p,α)^{14}N reaction plays a key role in various astrophysical scenarios, from asymptotic giant branch stars to classical novae. It affects the synthesis of rare isotopes such as ^{17}O and ^{18}F, which can provide constraints on astrophysical models. A new direct determination of the E_{R}=64.5 keV resonance strength performed at the Laboratory for Underground Nuclear Astrophysics (LUNA) accelerator has led to the most accurate value to date ωγ=10.0±1.4_{stat}±0.7_{syst} neV, thanks to a significant background reduction underground and generally improved experimental conditions. The (bare) proton partial width of the corresponding state at E_{x}=5672 keV in ^{18}F is Γ_{p}=35±5_{stat}±3_{syst} neV. This width is about a factor of 2 higher than previously estimated, thus leading to a factor of 2 increase in the ^{17}O(p, α)^{14}N reaction rate at astrophysical temperatures relevant to shell hydrogen burning in red giant and asymptotic giant branch stars. The new rate implies lower ^{17}O/^{16}O ratios, with important implications on the interpretation of astrophysical observables from these stars.
Language	English
Publishing date	2016-09-30
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.117.142502
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Direct Capture Cross Section and the E_{p}=71 and 105 keV Resonances in the ^{22}Ne(p,γ)^{23}Na Reaction.

Ferraro, F / Takács, M P / Piatti, D / Cavanna, F / Depalo, R / Aliotta, M / Bemmerer, D / Best, A / Boeltzig, A / Broggini, C / Bruno, C G / Caciolli, A / Chillery, T / Ciani, G F / Corvisiero, P / Davinson, T / D'Erasmo, G / Di Leva, A / Elekes, Z /

Fiore, E M / Formicola, A / Fülöp, Zs / Gervino, G / Guglielmetti, A / Gustavino, C / Gyürky, Gy / Imbriani, G / Junker, M / Karakas, A / Kochanek, I / Lugaro, M / Marigo, P / Menegazzo, R / Mossa, V / Pantaleo, F R / Paticchio, V / Perrino, R / Prati, P / Schiavulli, L / Stöckel, K / Straniero, O / Szücs, T / Trezzi, D / Zavatarelli, S

Physical review letters

2018 Volume 121, Issue 17, Page(s) 172701

Abstract: The ^{22}Ne(p,γ)^{23}Na reaction, part of the neon-sodium cycle of hydrogen burning, may explain the observed anticorrelation between sodium and oxygen abundances in globular cluster stars. Its rate is controlled by a number of low-energy resonances and ... ...

Abstract	The ^{22}Ne(p,γ)^{23}Na reaction, part of the neon-sodium cycle of hydrogen burning, may explain the observed anticorrelation between sodium and oxygen abundances in globular cluster stars. Its rate is controlled by a number of low-energy resonances and a slowly varying nonresonant component. Three new resonances at E_{p}=156.2, 189.5, and 259.7 keV have recently been observed and confirmed. However, significant uncertainty on the reaction rate remains due to the nonresonant process and to two suggested resonances at E_{p}=71 and 105 keV. Here, new ^{22}Ne(p,γ)^{23}Na data with high statistics and low background are reported. Stringent upper limits of 6×10^{-11} and 7×10^{-11} eV (90% confidence level), respectively, are placed on the two suggested resonances. In addition, the off-resonant S factor has been measured at unprecedented low energy, constraining the contributions from a subthreshold resonance and the direct capture process. As a result, at a temperature of 0.1 GK the error bar of the ^{22}Ne(p,γ)^{23}Na rate is now reduced by 3 orders of magnitude.
Language	English
Publishing date	2018-11-13
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.121.172701
Database	MEDical Literature Analysis and Retrieval System OnLINE

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Article ; Online: Three New Low-Energy Resonances in the ^{22}Ne(p,γ)^{23}Na Reaction.

Physical review letters

2015 Volume 115, Issue 25, Page(s) 252501

Abstract: The ^{22}Ne(p,γ)^{23}Na reaction takes part in the neon-sodium cycle of hydrogen burning. This cycle affects the synthesis of the elements between ^{20}Ne and ^{27}Al in asymptotic giant branch stars and novae. The ^{22}Ne(p,γ)^{23}Na reaction rate is ... ...

Abstract	The ^{22}Ne(p,γ)^{23}Na reaction takes part in the neon-sodium cycle of hydrogen burning. This cycle affects the synthesis of the elements between ^{20}Ne and ^{27}Al in asymptotic giant branch stars and novae. The ^{22}Ne(p,γ)^{23}Na reaction rate is very uncertain because of a large number of unobserved resonances lying in the Gamow window. At proton energies below 400 keV, only upper limits exist in the literature for the resonance strengths. Previous reaction rate evaluations differ by large factors. In the present work, the first direct observations of the ^{22}Ne(p,γ)^{23}Na resonances at 156.2, 189.5, and 259.7 keV are reported. Their resonance strengths are derived with 2%-7% uncertainty. In addition, upper limits for three other resonances are greatly reduced. Data are taken using a windowless ^{22}Ne gas target and high-purity germanium detectors at the Laboratory for Underground Nuclear Astrophysics in the Gran Sasso laboratory of the National Institute for Nuclear Physics, Italy, taking advantage of the ultralow background observed deep underground. The new reaction rate is a factor of 20 higher than the recent evaluation at a temperature of 0.1 GK, relevant to nucleosynthesis in asymptotic giant branch stars.
Language	English
Publishing date	2015-12-18
Publishing country	United States
Document type	Journal Article
ZDB-ID	208853-8
ISSN	1079-7114 ; 0031-9007
ISSN (online)	1079-7114
ISSN	0031-9007
DOI	10.1103/PhysRevLett.115.252501
Database	MEDical Literature Analysis and Retrieval System OnLINE

In stock of ZB MED Bonn / Germany

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Article ; Online: Verification of the Optical System of the 9.7-m Prototype Schwarzschild-Couder Telescope

Adams, C. / Alfaro, R. / Ambrosi, G. / Ambrosio, M. / Aramo, C. / Benbow, W. / Bertucci, B. / Bissaldi, E. / Bitossi, M. / Boiano, A. / Bonavolonta, C. / Bose, R. / Brill, A. / Buckley, J. H. / Byrum, K. / Cameron, R. A. / Capasso, M. / Caprai, M. / Covault, C. E. /

Venere, L. Di / Fegan, S. / Feng, Q. / Fiandrini, E. / Furniss, A. / Garczarczyk, M. / Garfias, F. / Gent, A. / Giglietto, N. / Giordano, F. / Gonz'alez, M. M. / Halliday, R. / Hervet, O. / Hughes, G. / Humensky, T. B. / Ionica, M. / Iriarte, A. / Jin, W. / Kaarat, P. / Kieda, D. / Kim, B. / Licciulli, F. / Limon, M. / Loporchio, S. / Masone, V. / Meures, T. / Mode, B. A. W. / Mukherjee, R. / Nieto, D. / Okumura, A. / Otte, N. / Palombara, N. La / Pantaleo, F. R. / Paoletti, R. / Pareschi, G. / Petrashyk, A. / Powell, J. / Powell, K. / Ribeiro, D. / Roache, E. / Rousselle, J. / Rugliancich, A. / Ru'iz-D'iaz-Soto, J. / Santander, M. / Schlenstedt, S. / Scuderi, S. / Shang, R. / Sironi, G. / Stevenson, B. / Stiaccini, L. / Taylor, L. P. / Tosti, L. / Tovmassian, G. / Vagelli, V. / Valentino, M. / Vandenbroucke, J. / Vassiliev, V. V. / Wakely, S. P. / Wilcox, P. / Williams, D. A. / Yu, P.

Abstract: For the first time in the history of ground-based $\gamma$-ray astronomy, the on-axis performance of the dual mirror, aspheric, aplanatic Schwarzschild-Couder optical system has been demonstrated in a $9.7$-m aperture imaging atmospheric Cherenkov ... ...

Abstract	For the first time in the history of ground-based $\gamma$-ray astronomy, the on-axis performance of the dual mirror, aspheric, aplanatic Schwarzschild-Couder optical system has been demonstrated in a $9.7$-m aperture imaging atmospheric Cherenkov telescope. The novel design of the prototype Schwarzschild-Couder Telescope (pSCT) is motivated by the need of the next-generation Cherenkov Telescope Array (CTA) observatory to have the ability to perform wide ($\geq 8^{\circ}$) field-of-view observations simultaneously with superior imaging of atmospheric cascades (resolution of $0.067^{\circ}$ per pixel or better). The pSCT design, if implemented in the CTA installation, has the potential to improve significantly both the $\gamma$-ray angular resolution and the off-axis sensitivity of the observatory, reaching nearly the theoretical limit of the technique and thereby making a major impact on the CTA observatory sky survey programs, follow-up observations of multi-messenger transients with poorly known initial localization, as well as on the spatially resolved spectroscopic studies of extended $\gamma$-ray sources. This contribution reports on the initial alignment procedures and point-spread-function results for the challenging segmented aspheric primary and secondary mirrors of the pSCT.
Keywords	covid19
Publisher	ArXiv
Document type	Article ; Online
DOI	10.1117/12.2568134
Database	COVID19

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Article ; Online: Direct Measurement of the ^{13}C(α,n)^{16}O Cross Section into the s-Process Gamow Peak.

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Article ; Online: Erratum: Three New Low-Energy Resonances in the ^{22}Ne(p,γ)^{23}Na Reaction [Phys. Rev. Lett. 115, 252501 (2015)].

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Article ; Online: The baryon density of the Universe from an improved rate of deuterium burning.

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Article ; Online: Improved Direct Measurement of the 64.5 keV Resonance Strength in the ^{17}O(p,α)^{14}N Reaction at LUNA.

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Article ; Online: Direct Capture Cross Section and the E_{p}=71 and 105 keV Resonances in the ^{22}Ne(p,γ)^{23}Na Reaction.

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Article ; Online: Three New Low-Energy Resonances in the ^{22}Ne(p,γ)^{23}Na Reaction.

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Article ; Online: Verification of the Optical System of the 9.7-m Prototype Schwarzschild-Couder Telescope

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