S-wave pairing of Λ hyperons in dense matter

被引：71

作者：

Balberg, S ^{[1
]}

Barnea, N

机构：

[1] Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel

[2] European Ctr Theoret Studies Nucl Phys & Related, ECT, I-38050 Villazzano, Trento, Italy

来源：

PHYSICAL REVIEW C | 1998年 / 57卷 / 01期

关键词：

D O I：

10.1103/PhysRevC.57.409

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：

In this work we calculate the S-1(0) gap energies of Lambda hyperons in neutron star matter. The calculation is based on a solution of the BCS gap equation for an effective G-matrix parametrization of the Lambda-Lambda interaction with a nuclear matter background, presented recently by Lanskoy and Yamamoto. We find that a gap energy of a few tenths of a MeV is expected for Lambda Fermi momenta up to about 1.3 fm(-1). Implications for neutron star matter are examined, and suggest the existence of a Lambda S-1(0) superfluid between the threshold baryon density for Lambda formation and the baryon density where the Lambda fraction reaches 15-20 %.

引用

页码：409 / 416

页数：8

共 36 条

[1] POSTGLITCH RELAXATION OF THE VELA PULSAR AFTER ITS 1ST 8 LARGE GLITCHES - A REEVALUATION WITH THE VORTEX CREEP MODEL [J].

ALPAR, MA ;

CHAU, HF ;

CHENG, KS ;

PINES, D .

ASTROPHYSICAL JOURNAL, 1993, 409 (01) :345-359

[2] SUPERFLUIDITY OF NEUTRON MATTER .1. SINGLET PAIRING [J].

AMUNDSEN, L ;

OSTGAARD, E .

NUCLEAR PHYSICS A, 1985, 437 (02) :487-508

[3] DIRECT OBSERVATION OF SEQUENTIAL WEAK DECAY OF A DOUBLE HYPERNUCLEUS [J].

AOKI, S ;

BAHK, SY ;

CHUNG, KS ;

CHUNG, SH ;

FUNAHASHI, H ;

HAHN, CH ;

HARA, T ;

HIRATA, S ;

HOSHINO, K ;

IEIRI, M ;

IIJIMA, T ;

IMAI, K ;

ISHIGAMI, T ;

ITOW, Y ;

KAZUNO, M ;

KIKUCHI, K ;

KIM, CO ;

KIM, DC ;

KIM, JY ;

KOBAYASHI, M ;

KODAMA, K ;

MAEDA, Y ;

MASAIKE, A ;

MASUOKA, A ;

MATSUDA, Y ;

NAGOSHI, C ;

NAKAMURA, M ;

NAKANISHI, S ;

NAKANO, T ;

NAKAZAWA, K ;

NIWA, K ;

ODA, H ;

OKABE, H ;

ONO, S ;

OZAKI, R ;

PARK, IG ;

SATO, Y ;

SHIBUYA, H ;

SHIMIZU, HM ;

SONG, JS ;

SUGIMOTO, M ;

TAJIMA, H ;

TAKASHIMA, R ;

TAKEUTCHI, F ;

TANAKA, KH ;

TERANAKA, M ;

TEZUKA, I ;

TOGAWA, H ;

USHIDA, N ;

WATANABE, S .

PROGRESS OF THEORETICAL PHYSICS, 1991, 85 (06) :1287-1298

[4] An effective equation of state for dense matter with strangeness [J].

Balberg, S ;

Gal, A .

NUCLEAR PHYSICS A, 1997, 625 (1-2) :435-472

[5] SUPERFLUIDITY IN NEUTRON MATTER AND NUCLEAR-MATTER WITH REALISTIC INTERACTIONS [J].

BALDO, M ;

CUGNON, J ;

LEJEUNE, A ;

LOMBARDO, U .

NUCLEAR PHYSICS A, 1990, 515 (03) :409-432

[6] THEORY OF SUPERCONDUCTIVITY [J].

BARDEEN, J ;

COOPER, LN ;

SCHRIEFFER, JR .

PHYSICAL REVIEW, 1957, 108 (05) :1175-1204

[7] SELF-CONSISTENT DESCRIPTION OF NUCLEAR-LEVEL DENSITIES [J].

BARRANCO, M ;

TREINER, J .

NUCLEAR PHYSICS A, 1981, 351 (02) :269-284

[8] DENSITY-DEPENDENCE OF THE SIGMA-NUCLEUS OPTICAL-POTENTIAL DERIVED FROM SIGMA-ATOM DATA [J].

BATTY, CJ ;

FRIEDMAN, E ;

GAL, A .

PHYSICS LETTERS B, 1994, 335 (3-4) :273-278

[9] THE ALPHA-CLUSTER HYPERNUCLEI HE-5(LAMBDA), HE-6(LAMBDA-LAMBDA), BE-9(LAMBDA), BE-10(LAMBDA-LAMBDA) AND HYPERNUCLEAR INTERACTIONS [J].

BODMER, AR ;

USMANI, QN .

NUCLEAR PHYSICS A, 1987, 468 (3-4) :653-668

[10] PAIRING GAPS IN NUCLEONIC SUPERFLUIDS [J].

CHEN, JMC ;

CLARK, JW ;

DAVE, RD ;

KHODEL, VV .

NUCLEAR PHYSICS A, 1993, 555 (01) :59-89

← 1 2 3 4 →