Observation of Low- and High-Energy Gamow-Teller Phonon Excitations in Nuclei

被引：62

作者：

Fujita, Y. ^{[1
,2
]}

Fujita, H. ^{[1
]}

Adachi, T. ^{[1
]}

Bai, C. L. ^{[3
]}

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

Berg, G. P. A. ^{[6
,7
]}

von Brentano, P. ^{[8
]}

Colo, G. ^{[9
,10
]}

Csatlos, M. ^{[5
]}

Deaven, J. M. ^{[11
]}

Estevez-Aguado, E. ^{[4
]}

Fransen, C. ^{[8
]}

De Frenne, D. ^{[12
]}

Fujita, K. ^{[1
]}

Ganioglu, E. ^{[13
]}

Guess, C. J. ^{[11
]}

Gulyas, J. ^{[5
]}

Hatanaka, K. ^{[1
]}

Hirota, K. ^{[1
]}

Honma, M. ^{[14
]}

Ishikawa, D. ^{[1
]}

Jacobs, E. ^{[12
]}

Krasznahorkay, A. ^{[5
]}

Matsubara, H. ^{[1
]}

Matsuyanagi, K. ^{[15
,16
]}

Meharchand, R. ^{[11
]}

Molina, F. ^{[4
]}

Muto, K. ^{[17
]}

Nakanishi, K. ^{[1
]}

Negret, A. ^{[18
]}

Okamura, H. ^{[1
]}

Ong, H. J. ^{[1
]}

Otsuka, T. ^{[19
]}

Pietralla, N. ^{[8
]}

Perdikakis, G. ^{[11
,20
]}

Popescu, L. ^{[21
]}

Rubio, B. ^{[4
]}

Sagawa, H. ^{[14
,15
]}

Sarriguren, P. ^{[22
]}

Scholl, C. ^{[8
]}

Shimbara, Y. ^{[23
]}

Shimizu, Y. ^{[1
]}

Susoy, G. ^{[13
]}

Suzuki, T. ^{[1
]}

Tameshige, Y. ^{[1
]}

Tamii, A. ^{[1
]}

Thies, J. H. ^{[24
]}

Uchida, M. ^{[1
]}

Wakasa, T. ^{[1
]}

Yosoi, M. ^{[1
]}

机构：

[1] Osaka Univ, Nucl Phys Res Ctr, Ibaraki, Osaka 5670047, Japan

[2] Osaka Univ, Dept Phys, Toyonaka, Osaka 5600043, Japan

[3] Sichuan Univ, Dept Phys, Chengdu 610065, Peoples R China

[4] CSIC Univ Valencia, Inst Fis Corpuscular, E-46071 Valencia, Spain

[5] Inst Nucl Res MTA Atomki, H-4001 Debrecen, Hungary

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

[7] Univ Notre Dame, JINA, Notre Dame, IN 46556 USA

[8] Univ Cologne, Inst Kernphys, D-50937 Cologne, Germany

[9] Univ Milan, Dipartimento Fis, I-20133 Milan, Italy

[10] Ist Nazl Fis Nucl, Sez Milano, I-20133 Milan, Italy

[11] Michigan State Univ, Natl Superconducting Cyclotron Lab, E Lansing, MI 48824 USA

[12] Univ Ghent, Vakgroep Subatomaire Stralingsfys, B-9000 Ghent, Belgium

[13] Istanbul Univ, Dept Phys, TR-34134 Istanbul, Turkey

[14] Univ Aizu, Ctr Math Sci, Fukushima 9658580, Japan

[15] RIKEN, Nishina Ctr, Wako, Saitama 3510198, Japan

[16] Kyoto Univ, Yukawa Inst Theoret Phys, Kyoto 6068502, Japan

[17] Tokyo Inst Technol, Dept Phys, Meguro Ku, Tokyo 1528551, Japan

[18] Horia Hulubei Natl Inst Phys & Nucl Engn, Bucharest 077125, Romania

[19] Univ Tokyo, Dept Phys, Bunkyo Ku, Tokyo 1130033, Japan

[20] Cent Michigan Univ, Dept Phys, Mt Pleasant, MI 48859 USA

[21] SCK CEN, Belgian Nucl Res Ctr, B-2400 Mol, Belgium

[22] IEM CSIC, Inst Estruct Mat, E-28006 Madrid, Spain

[23] Niigata Univ, Grad Sch Sci & Technol, Nishi Ku, Niigata 9502181, Japan

[24] Univ Munster, Inst Kernphys, D-48149 Munster, Germany

来源：

PHYSICAL REVIEW LETTERS | 2014年 / 112卷 / 11期

基金：

美国国家科学基金会;

关键词：

BEAM LINE; SPECTROMETER; STRENGTH; SYMMETRY; SPIN; T=0;

D O I：

10.1103/PhysRevLett.112.112502

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Gamow-Teller (GT) transitions in atomic nuclei are sensitive to both nuclear shell structure and effective residual interactions. The nuclear GT excitations were studied for the mass number A = 42, 46, 50, and 54 "f-shell" nuclei in (He-3, t) charge-exchange reactions. In the Ca-42 -> Sc-42 reaction, most of the GT strength is concentrated in the lowest excited state at 0.6 MeV, suggesting the existence of a low-energy GT phonon excitation. As A increases, a high-energy GT phonon excitation develops in the 6-11 MeV region. In the Fe-54 -> Co-54 reaction, the high-energy GT phonon excitation mainly carries the GT strength. The existence of these two GT phonon excitations are attributed to the 2 fermionic degrees of freedom in nuclei.

引用

页数：5

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