40Ca(α,γ)44Ti reaction in the energy regime of supernova nucleosynthesis -: art. no. 041102

被引：43

作者：

Nassar, H ^{[1
]}

Paul, M

Ahmad, I

Ben-Dov, Y

Caggiano, J

Ghelberg, S

Goriely, S

Greene, JP

Hass, M

Heger, A

Heinz, A

Henderson, DJ

Janssens, RVF

Jiang, CL

Kashiv, Y

Singh, BSN

Ofan, A

Pardo, RC

Pennington, T

Rehm, KE

Savard, G

Scott, R

Vondrasek, R

机构：

[1] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

[2] Argonne Natl Lab, Argonne, IL 60439 USA

[3] NRC Negev, Div Phys, IL-84190 Beer Sheva, Israel

[4] Univ Libre Bruxelles, B-1050 Brussels, Belgium

[5] Weizmann Inst Sci, Dept Particle Phys, IL-76100 Rehovot, Israel

[6] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[7] Univ Calif Santa Cruz, Santa Cruz, CA 95064 USA

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 04期

关键词：

D O I：

10.1103/PhysRevLett.96.041102

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The Ti-44(t(1/2)=59 yr) nuclide, an important signature of supernova nucleosynthesis, has recently been observed as live radioactivity by gamma-ray astronomy from the Cas A remnant. We investigate in the laboratory the major Ti-44 production reaction Ca-40(alpha,gamma)Ti-44 (E-c.m.similar to 0.6-1.2 MeV/u) by direct off-line counting of Ti-44 nuclei. The yield, significantly higher than inferred from previous experiments, is analyzed in terms of a statistical model using microscopic nuclear inputs. The associated stellar rate has important astrophysical consequences, increasing the calculated supernova Ti-44 yield by a factor similar to 2 over previous estimates and bringing it closer to Cas A observations.

引用

页数：4

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