Invariant mass spectrum and α-n correlation function studied in the fragmentation of 6He on a carbon target

被引：62

作者：

Aleksandrov, D ^{[1
]}

Aumann, T

Axelsson, L

Baumann, T

Borge, MJG

Chulkov, LV

Cub, J

Dostal, W

Eberlein, B

Elze, TW

Emling, H

Geissel, H

Goldberg, VZ

Golovkov, M

Grunschloss, A

Hellstrom, M

Holeczek, J

Holzmann, R

Jonson, B

Korshenninikov, AA

Kratz, JV

Kraus, G

Kulessa, R

Leifels, Y

Leistenschneider, A

Leth, T

Mukha, I

Munzenberg, G

Nickel, F

Nilsson, T

Nyman, G

Petersen, B

Pfutzner, M

Richter, A

Riisager, K

Scheidenberger, C

Schrieder, G

Schwab, W

Simon, H

Smedberg, MH

Steiner, M

Stroth, J

Surowiec, A

Suzuki, T

Tengblad, OO

Zhukov, MV

机构：

[1] IV Kurchatov Atom Energy Inst, Moscow 123182, Russia

[2] Univ Mainz, Inst Kernchem, D-55099 Mainz, Germany

[3] Chalmers Tekniska Hogskola, Inst Fys, S-41296 Gothenburg, Sweden

[4] Univ Goteborg, S-41296 Gothenburg, Sweden

[5] Gesell Schwerionenforsch, D-64291 Darmstadt, Germany

[6] CSIC, Inst Estructura Mat, E-28006 Madrid, Spain

[7] TH Darmstadt, Inst Kernphys, D-64289 Darmstadt, Germany

[8] Univ Frankfurt, Inst Kernphys, D-60486 Frankfurt, Germany

[9] Univ Slaski, Inst Fizyki, PL-40007 Katowice, Poland

[10] RIKEN, Wako, Saitama 35101, Japan

[11] Jagiellonian Univ, Inst Fizyki, PL-30059 Krakow, Poland

[12] Aarhus Univ, Inst Fys & Astron, DK-8000 Aarhus C, Denmark

[13] Michigan State Univ, E Lansing, MI 48824 USA

来源：

NUCLEAR PHYSICS A | 1998年 / 633卷 / 02期

关键词：

secondary radioactive beams; exotic nuclei; Halo nuclei; He-6; He-5; momentum distributions; invariant mass spectra; fragmentation mechanism; breakup reactions;

D O I：

10.1016/S0375-9474(98)00120-1

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：

Momentum distributions and invariant mass spectra from the breakup of He-6 ions with an energy of 240 MeV/u interacting with a carbon target have been studied. The data were used to extract information about the reaction mechanism which is influenced by the structure of He-6. It is found that the dominant reaction mechanism is a two-step process: knock out of one neutron followed by the decay of the He-5 resonance. The shape of the (alpha+n) two-body invariant mass spectrum is interpreted as mainly reflecting the 5He ground state which is a J(pi) = 3/2(-) resonance. However, no evidence for correlations between cu particles and neutrons is observed in the momentum widths of the distributions. It is demonstrated that a combined analysis of the two-body invariant mass spectrum and an appropriate correlation function may be used to determine the properties of the intermediate resonance. (C) 1998 Elsevier Science B.V.

引用

页码：234 / 246

页数：13

共 16 条

[1] INVARIANT-MASS DEPENDENCE OF 2-PION INCLUSIVE CORRELATION-FUNCTIONS [J].

BERGER, EL ;

SINGER, R ;

THOMAS, GH ;

KAFKA, T .

PHYSICAL REVIEW D, 1977, 15 (01) :206-219

[2] THEORY OF ANGULAR CORRELATION OF NUCLEAR RADIATIONS [J].

BIEDENHARN, LC ;

ROSE, ME .

REVIEWS OF MODERN PHYSICS, 1953, 25 (03) :729-777

[3] A LARGE AREA DETECTOR FOR HIGH-ENERGY NEUTRONS [J].

BLAICH, T ;

ELZE, TW ;

EMLING, H ;

FREIESLEBEN, H ;

GRIMM, K ;

HENNING, W ;

HOLZMANN, R ;

ICKERT, G ;

KELLER, JG ;

KLINGLER, H ;

KNEISSL, W ;

KONIG, R ;

KULESSA, R ;

KRATZ, JV ;

LAMBRECHT, D ;

LANGE, JS ;

LEIFELS, Y ;

LUBKIEWICZ, E ;

PROFT, M ;

PROKOPOWICZ, W ;

SCHUTTER, C ;

SCHMIDT, R ;

SPIES, H ;

STELZER, K ;

STROTH, J ;

WALUS, W ;

WAJDA, E ;

WOLLERSHEIM, HJ ;

ZINSER, M ;

ZUDE, E .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1992, 314 (01) :136-154

[4] DETERMINATION OF R-FUNCTION AND PHYSICAL-STATE PARAMETERS FOR N-HE-4 ELASTIC-SCATTERING BELOW 21 MEV [J].

BOND, JE ;

FIRK, FWK .

NUCLEAR PHYSICS A, 1977, 287 (02) :317-343

[5] Large spin alignment of the unbound He-5 fragment after fragmentation of 240 MeV/nucleon He-6 [J].

Chulkov, LV ;

Aumann, T ;

Aleksandrov, D ;

Axelsson, L ;

Baumann, T ;

Borge, MJG ;

Collatz, R ;

Cub, J ;

Dostal, W ;

Eberlein, B ;

Elze, TW ;

Emling, H ;

Geissel, H ;

Goldberg, VZ ;

Golovkov, M ;

Grunschloss, A ;

Hellstrom, M ;

Holeczek, J ;

Holzmann, R ;

Jonson, B ;

Korsheninnikov, AA ;

Kratz, JV ;

Kraus, G ;

Kulessa, R ;

Leifels, Y ;

Leistenschneider, A ;

Leth, T ;

Mukha, I ;

Munzenberg, G ;

Nickel, F ;

Nilsson, T ;

Nyman, G ;

Peterson, B ;

Pfutzner, M ;

Richter, A ;

Riisager, K ;

Scheidenberger, C ;

Schrieder, G ;

Schwab, W ;

Simon, H ;

Smedberg, MH ;

Steiner, M ;

Stroth, J ;

Surowiec, A ;

Suzuki, T ;

Tengblad, O .

PHYSICAL REVIEW LETTERS, 1997, 79 (02) :201-204

[6] STUDY OF EVENT MIXING AND ITS APPLICATION TO THE EXTRACTION OF RESONANCE SIGNALS [J].

DRIJARD, D ;

FISCHER, HG ;

NAKADA, T .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT, 1984, 225 (02) :367-377

[7] Momentum distributions in stripping reactions of single-nucleon halo nuclei [J].

Esbensen, H .

PHYSICAL REVIEW C, 1996, 53 (04) :2007-2010

[8] HEAVY-ION PROJECTILE FRAGMENTATION - A REEXAMINATION [J].

FRIEDMAN, WA .

PHYSICAL REVIEW C, 1983, 27 (02) :569-577

[9] The Pauli principle in a three-body cluster model and the momentum distributions after fragmentation of He-6 and Li-11 [J].

Garrido, E ;

Fedorov, DV ;

Jensen, AS .

NUCLEAR PHYSICS A, 1997, 617 (02) :153-175

[10] STATISTICAL-MODELS OF FRAGMENTATION PROCESSES [J].

GOLDHABER, AS .

PHYSICS LETTERS B, 1974, B 53 (04) :306-308

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