Isovector soft dipole mode in 6Be

被引：15

作者：

Fomichev, A. S. ^{[2
]}

Chudoba, V. ^{[2
,3
]}

Egorova, I. A. ^{[1
]}

Ershov, S. N. ^{[1
]}

Golovkov, M. S. ^{[2
]}

Gorshkov, A. V. ^{[2
]}

Gorshkov, V. A. ^{[2
]}

Grigorenko, L. V. ^{[2
,4
,5
]}

Kaminski, G. ^{[2
,6
]}

Krupko, S. A. ^{[2
]}

Mukha, I. G. ^{[4
]}

Parfenova, Yu. L. ^{[2
,7
]}

Sidorchuk, S. I. ^{[2
]}

Slepnev, R. S. ^{[2
]}

Standylo, L. ^{[2
,8
]}

Stepantsov, S. V. ^{[2
]}

Ter-Akopian, G. M. ^{[2
]}

Wolski, R. ^{[2
,6
]}

Zhukov, M. V. ^{[9
]}

机构：

[1] JINR, Bogolyubov Lab Theoret Phys, Dubna 141980, Russia

[2] JINR, Flerov Lab Nucl React, Dubna 141980, Russia

[3] Silesian Univ Opava, Inst Phys, Opava 74601, Czech Republic

[4] GSI Helmholtzzentrum Schwerionenforsch, D-64291 Darmstadt, Germany

[5] Kurchatov Inst, Russian Res Ctr, Moscow 123182, Russia

[6] Inst Nucl Phys PAN, PL-31342 Krakow, Poland

[7] Moscow MV Lomonosov State Univ, Skobeltsyn Inst Nucl Phys, Moscow 119991, Russia

[8] Andrzej Soltan Inst Nucl Studies, PL-00681 Warsaw, Poland

[9] Chalmers, S-41296 Gothenburg, Sweden

来源：

PHYSICS LETTERS B | 2012年 / 708卷 / 1-2期

基金：

俄罗斯基础研究基金会;

关键词：

Be-6; Two-proton decay; Three-body Coulomb problem; Hyperspherical harmonics method; Kinematically complete measurements; CHARGE-EXCHANGE SCATTERING; NEUTRON-RICH NUCLEI; LIGHT-NUCLEI; HE-6; HALO; EXCITATIONS; RESONANCE; ISOTOPES; SPECTRA; DECAYS;

D O I：

10.1016/j.physletb.2012.01.004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

By using the H-1(Li-6,Be-6)n charge-exchange reaction, population of continuum states in Be-6 was observed up to E-T = 16 MeV, E-T being the Be-6 energy above its three-body decay threshold. In kinematically complete measurements performed by detecting alpha + p + p coincidences, an E-T spectrum of high statistics was obtained, containing approximately similar to 5 x 10(6) events. The spectrum provides detailed correlation information about the well-known 0(+) ground state of Be-6 at E-T = 1.37 MeV and its 2(+) state at E-T = 3.05 MeV. Moreover, a broad structure extending from 4 to 16 MeV was observed. It contains negative parity states populated by Delta L = 1 angular momentum transfer without other significant contributions. This structure can be interpreted as a novel phenomenon, i.e. the isovector soft dipole mode associated with the Li-6 ground state. The population of this mode in the charge-exchange reaction is a dominant phenomenon for this reaction, being responsible for about 60% of the cross-section obtained in the measured energy range. (C) 2012 Elsevier B.V. All rights reserved.

引用

页码：6 / 13

页数：8

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