DIRECT PROTON DECAY FROM THE GAMOW-TELLER RESONANCE IN BI-208

被引：100

作者：

AKIMUNE, H

DAITO, I

FUJITA, Y

FUJIWARA, M

GREENFIELD, MB

HARAKEH, MN

INOMATA, T

JANECKE, J

KATORI, K

NAKAYAMA, S

SAKAI, H

SAKEMI, Y

TANAKA, M

YOSOI, M

机构：

[1] OSAKA UNIV, DEPT PHYS, TOYONAKA, OSAKA 560, JAPAN

[2] INT CHRISTIAN UNIV, DIV NAT SCI, MITAKA, TOKYO 181, JAPAN

[3] KERNFYS VERSNELLER INST, 9747 AA GRONINGEN, NETHERLANDS

[4] UNIV MICHIGAN, DEPT PHYS, ANN ARBOR, MI 48109 USA

[5] UNIV TOKUSHIMA, DEPT PHYS, TOKUSHIMA, JAPAN

[6] UNIV TOKYO, DEPT PHYS, BUNKYO KU, TOKYO 113, JAPAN

[7] KOBE TOKIWA JR COLL, KOBE, HYOGO 653, JAPAN

[8] KYOTO UNIV, DEPT PHYS, KYOTO 60601, JAPAN

来源：

PHYSICAL REVIEW C | 1995年 / 52卷 / 02期

关键词：

D O I：

10.1103/PhysRevC.52.604

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：

Spin-isospin excitations in Bi-208 have been investigated using the Pb-208(He-3,t)Bi-208 reaction at and near theta approximate to 0 degrees at E(He-3)=450 MeV. The microscopic structure of the Gamow-Teller resonance (GTR), the isobaric analog state (IAS), and the spin-flip dipole (Delta L = 1) resonance (SDR) in Bi-208 has been studied by observing their direct proton decays to the low-lying neutron-hole states in Pb-207. Decay protons were measured at backward angles in coincidence with tritons detected at and near 0 degrees. The total branching ratio for proton decay from the GTR is determined to be only 4.9+/-1.3%. The total branching ratio for proton decay from the SDR amounts to 14.1+/-4.2%. The deduced total widths as well as the total and partial proton escape widths of the GTR and IAS are found to be in reasonable agreement with recent theoretical estimates obtained in the framework of the continuum Tamm-Dancoff approximation.

引用

页码：604 / 615

页数：12

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