Indirect study of the stellar 34Ar(α, p)37K reaction rate through 40Ca(p, t)38Ca reaction measurements

被引：12

作者：

Long, A. M. ^{[1
,2
,9
]}

Adachi, T. ^{[3
]}

Beard, M. ^{[1
,2
]}

Berg, G. P. A. ^{[1
,2
]}

Buthelezi, Z. ^{[4
]}

Carter, J. ^{[5
]}

Couder, M. ^{[1
,2
]}

deBoer, R. J. ^{[1
,2
]}

Fearick, R. W. ^{[6
]}

Fortsch, S. V. ^{[4
]}

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

Mira, J. P. ^{[7
]}

Murray, S. H. T. ^{[4
]}

Neveling, R. ^{[4
]}

Papka, P. ^{[4
,7
]}

Smit, F. D. ^{[4
]}

Sideras-Haddad, E. ^{[5
]}

Swartz, J. A. ^{[4
,7
,10
]}

Talwar, R. ^{[1
,2
,11
]}

Usman, I. T. ^{[5
]}

Wiescher, M. ^{[1
,2
]}

Van Zyl, J. J. ^{[7
]}

Volya, A. ^{[8
]}

机构：

[1] Univ Notre Dame, Dept Phys, Notre Dame, IN 46556 USA

[2] Univ Notre Dame, Joint Inst Nucl Astrophys, Notre Dame, IN 46556 USA

[3] Tohoku Univ, Res Ctr Electron Photon Sci, Taihaku Ku, Sendai, Miyagi 9820826, Japan

[4] iThemba Lab Accelerator Sci, ZA-7129 Somerset West, Western Cape, South Africa

[5] Univ Witwatersrand, Sch Phys, ZA-2050 Johannesburg, Gauteng, South Africa

[6] Univ Cape Town, Phys Dept, ZA-7700 Rondebosch, Western Cape, South Africa

[7] Univ Stellenbosch, Dept Phys, ZA-7602 Matieland, Western Cape, South Africa

[8] Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA

[9] Los Alamos Natl Labora, Div Phys, Los Alamos, NM 87545 USA

[10] Katholieke Univ Leuven, Inst Kern Stralingsfys, Celestijnenlaan 200D, B-3001 Leuven, Belgium

[11] Argonne Natl Lab, Div Phys, Argonne, IL 60439 USA

来源：

PHYSICAL REVIEW C | 2017年 / 95卷 / 05期

基金：

美国国家科学基金会; 新加坡国家研究基金会;

关键词：

ACCRETING NEUTRON-STARS; X-RAY-BURSTS; PARTICLE SPECTROSCOPIC STRENGTHS; NUCLEAR-LEVEL DENSITY; RP-PROCESS; SHELL; SYSTEMATICS; STABILITY; AR-34; SI-26;

D O I：

10.1103/PhysRevC.95.055803

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：

The Ar-34(alpha, p)K-37 reaction is believed to be one of the last in a sequence of (alpha, p) and (p, gamma) reactions within the T-z = -1, sd-shell nuclei, known as the alpha p-process. This process is expected to influence the shape and rise times of luminosity curves coming from type I x-ray bursts (XRBs). With very little experimental information known on many of the reactions within the alpha p-process, stellar rates are calculated using a statistical model, such as Hauser-Feshbach. Questions on the applicability of a Hauser-Feshbach model for the Ar-34(alpha, p)K-37 reaction arise due to level density considerations in the compound nucleus, Ca-38. We have performed high energy-resolution forward-angle Ca-40(p, t)Ca-38 measurements with the K = 600 spectrograph at iThemba LABS in order to identify levels above the alpha-threshold in Ca-38. States identified in this work were then used to determine the Ar-34(alpha, p)K-37 reaction rate based on a narrow-resonance formalism. Comparisons are made to two standard Hauser-Feshbach model predicted rates at XRB temperatures.

引用

页数：9

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