Experimental study of Gamow-Teller transitions via the high-energy-resolution 18O(3He, t)18F reaction: Identification of the low-energy "super" -Gamow-Teller state

被引：17

作者：

Fujita, H. ^{[1
]}

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

Utsuno, Y. ^{[3
]}

Yoshida, K. ^{[4
]}

Adachi, T. ^{[1
]}

Algora, A. ^{[5
,6
]}

Csatlos, M. ^{[6
]}

Deaven, J. M. ^{[7
,8
,9
]}

Estevez-Aguado, E. ^{[5
]}

Guess, C. J. ^{[7
,8
,9
,14
]}

Gulyas, J. ^{[6
]}

Hatanaka, K. ^{[1
]}

Hirota, K. ^{[1
]}

Hutton, R. ^{[7
,8
,9
,15
]}

Ishikawa, D. ^{[1
]}

Krasznahorkay, A. ^{[6
]}

Matsubara, H. ^{[1
,16
]}

Molina, F. ^{[5
,17
]}

Okamura, H. ^{[1
]}

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

Perdikakis, G. ^{[7
,8
,9
]}

Rubio, B. ^{[5
]}

Scholl, C. ^{[10
,18
]}

Shimbara, Y. ^{[11
,19
]}

Susoy, G. ^{[1
,12
]}

Suzuki, T. ^{[1
]}

Tamii, A. ^{[1
]}

Thies, J. H. ^{[13
]}

Zegers, R. G. T. ^{[7
,8
,9
]}

Zenihiro, J. ^{[1
,20
]}

机构：

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

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

[3] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[4] Kyoto Univ, Dept Phys, Kyoto 6068502, Japan

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

[6] Inst Nucl Res ATOMKI, POB 51, H-4001 Debrecen, Hungary

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

[8] Michigan State Univ, Joint Inst Nucl Astrophys, E Lansing, MI 48824 USA

[9] Michigan State Univ, Dept Phys & Astron, E Lansing, MI 48824 USA

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

[11] Niigata Univ, Grad Sch Sci & Technol, Niigata 9502181, Japan

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

[13] Westfalische Wilhelms Univ, Inst Kernphys, D-48149 Munster, Germany

[14] Univ Massachusetts, Dept Phys & Appl Phys, Lowell, MA 01854 USA

[15] Inst Def Anal, Alexandria, VA 22311 USA

[16] Tokyo Womens Med Univ, Shinjuku Ku, Tokyo 1628666, Japan

[17] Comis Chilena Energia Nucl, POB 188-D, Santiago, Chile

[18] Radiat Protect Serv, Inst Work Design North Rhine Westphalia, D-40225 Dusseldorf, Germany

[19] Tohoku Univ, CYRIC, Aoba Ku, Sendai, Miyagi 9808578, Japan

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

来源：

PHYSICAL REVIEW C | 2019年 / 100卷 / 03期

关键词：

BEAM LINE; NUCLEI; SPECTROMETER; SCATTERING; SPIN; WEAK; EXCITATIONS; ISOVECTOR; O-16;

D O I：

10.1103/PhysRevC.100.034618

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：

Using the high-resolution O-18(He-3, t)F-18 reaction at 0 degrees and at 140 MeV/nucleon, Gamow-Teller (GT) transitions were studied. A high energy resolution of 31 keV was achieved by applying dispersion matching techniques. The main part of the observed GT transition strength is concentrated in the transition to the F-18 ground state (g.s.). The absolute values of the reduced GT transition strengths, B(GT), were derived up to E-x = 12 MeV assuming proportionality between the B(GT) values and the reaction cross sections at 0 degrees. The B(GT) value obtained from the beta decay of F-18 (g.s.) -> O-18 (g.s.) was used to determine the proportionality constant. A total B(GT) of 4.06(5) was found and 76(1)% of the strength is concentrated to the ground state of F-18. The obtained B(GT) values were compared with those from the O-18(p, n) F-18 reaction and the mirror symmetric beta(+) decay of Ne-18 -> F-18. The candidates for 1(+) states with isospin T = 1 were identified by comparison with the O-18(p, p') data. The results of shell-model and quasiparticle-random-phase approximation calculations suggest constructive contributions of various configurations to the F-18 ground state, suggesting that this state is the low-energy super GT state.

引用

页数：13

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