Direct measurement of the 14N(p,γ)15O S factor -: art. no. 082503

被引：105

作者：

Runkle, RC ^{[1
]}

Champagne, AE

Angulo, C

Fox, C

Iliadis, C

Longland, R

Pollanen, J

机构：

[1] Univ N Carolina, Chapel Hill, NC 27599 USA

[2] Triangle Univ Nucl Lab, Durham, NC 27708 USA

[3] Univ Catholique Louvain, Ctr Rech Cyclotron, B-1348 Louvain, Belgium

来源：

PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.94.082503

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The N-14(p,gamma)O-15 reaction regulates the rate of energy generation in the stellar CN cycle. Because discrepancies have been found in the analysis and interpretation of previous capture data, we have measured the N-14(p,gamma)O-15 excitation function for energies in the range E-p(lab)=155-524 keV. Fits of these data using R-matrix theory yield a value for the S factor at zero energy of 1.68+/-0.09(stat)+/-0.16(syst) keV b, which is significantly smaller than the previous result. The corresponding reduction in the stellar reaction rate for N-14(p,gamma)O-15 has a number of interesting consequences, including an impact on estimates for the age of the Galaxy derived from globular clusters.

引用

页码：1 / 4

页数：4

共 18 条

[1] Solar fusion cross sections [J].

Adelberger, EG ;

Austin, SM ;

Bahcall, JN ;

Balantekin, AB ;

Bogaert, G ;

Brown, LS ;

Buchmann, L ;

Cecil, FE ;

Champagne, AE ;

de Braeckeleer, L ;

Duba, CA ;

Elliott, SR ;

Freedman, SJ ;

Gai, M ;

Goldring, G ;

Gould, CR ;

Gruzinov, A ;

Haxton, WC ;

Heeger, KM ;

Henley, E ;

Johnson, CW ;

Kamionkowski, M ;

Kavanagh, RW ;

Koonin, SE ;

Kubodera, K ;

Langanke, K ;

Motobayashi, T ;

Pandharipande, V ;

Parker, P ;

Robertson, RGH ;

Rolfs, C ;

Sawyer, RF ;

Shaviv, N ;

Shoppa, TD ;

Snover, KA ;

Swanson, E ;

Tribble, RE ;

Turck-Chieze, S ;

Wilkerson, JF .

REVIEWS OF MODERN PHYSICS, 1998, 70 (04) :1265-1291

[2] ENERGY-LEVELS OF LIGHT-NUCLEI A=13-15 [J].

AJZENBERGSELOVE, F .

NUCLEAR PHYSICS A, 1991, 523 (01) :1-196

[3] The 14N(p,γ)15O low-energy S-factor [J].

Angulo, C ;

Descouvemont, P .

NUCLEAR PHYSICS A, 2001, 690 (04) :755-768

[4] RESONANCE STRENGTHS OF SOME LIGHT-NUCLEI [J].

BECKER, HW ;

KIESER, WE ;

ROLFS, C ;

TRAUTVETTER, HP ;

WIESCHER, M .

ZEITSCHRIFT FUR PHYSIK A-HADRONS AND NUCLEI, 1982, 305 (04) :319-323

[5] 14N(3He,d)15O as a probe of direct capture in the 14N(p,γ)15O reaction -: art. no. 055804 [J].

Bertone, PF ;

Champagne, AE ;

Boswell, M ;

Iliadis, C ;

Hale, SE ;

Hansper, VY ;

Powell, DC .

PHYSICAL REVIEW C, 2002, 66 (05)

[6] Lifetime of the 6793-keV State in 15O -: art. no. 152501 [J].

Bertone, PF ;

Champagne, AE ;

Powell, DC ;

Iliadis, C ;

Hale, SE ;

Hansper, VY .

PHYSICAL REVIEW LETTERS, 2001, 87 (15) :152501-152501

[7] A lower limit on the age of the universe [J].

Chaboyer, B ;

Demarque, P ;

Kernan, PJ ;

Krauss, LM .

SCIENCE, 1996, 271 (5251) :957-961

[8] The age of globular clusters in light of hipparcos: Resolving the age problem? [J].

Chaboyer, B ;

Demarque, P ;

Kernan, PJ ;

Krauss, LM .

ASTROPHYSICAL JOURNAL, 1998, 494 (01) :96-110

[9]

*DIAGN APPL GROUP, 2000, LANL COMP COD MCNP4C

[10] Astrophysical S-factor of 14N(p, γ)15O [J].

Formicola, A ;

Imbriani, G ;

Costantini, H ;

Angulo, C ;

Bemmerer, D ;

Bonetti, R ;

Broggini, C ;

Corvisiero, P ;

Cruz, J ;

Descouvemont, P ;

Fülöp, Z ;

Gervino, G ;

Guglielmetti, A ;

Gustavino, C ;

Gyürky, G ;

Jesus, AP ;

Junker, M ;

Lemut, A ;

Menegazzo, R ;

Prati, P ;

Roca, V ;

Rolfs, C ;

Romano, M ;

Alvarez, CR ;

Schümann, F ;

Somorjai, E ;

Straniero, O ;

Strieder, F ;

Terrasi, F ;

Trautvetter, HP ;

Vomiero, A ;

Zavatarelli, S .

PHYSICS LETTERS B, 2004, 591 (1-2) :61-68

← 1 2 →