Improved limits on scalar weak couplings

Adelberger, E. G.

doi:10.1103/physrevlett.70.2856

Cited by 52 publications

(141 citation statements)

References 17 publications

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“…0 1 Fermi decay is sensitive to the exchange of hypothetical scalar bosons. Limits on the scalar interaction are poor, both from b decay and from high-energy experiments, and a 1% measurement of the b-n correlation coefficient a would be competitive [7]. Among alkali atoms, isomeric 38 K m has the only such pure Fermi decay.…”

mentioning

confidence: 99%

Magneto-optic Trapping ofβ-Decaying38Km,
Behr
¹
,
Gorelov
²
,
Swanson
³

et al. 1997
Phys. Rev. Lett.

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A magneto-optic trap (MOT) can provide a well-polarized, backing-free, localized source of radioactive atoms for b-decay experiments. We have trapped approximately 6000 atoms of 38 K m (t 1͞2 0.925 s) and 2000 atoms of 37 K (1.226 s) produced at the TRIUMF on-line separator TISOL in a vapor-cell MOT. We have measured optical isotope shifts and deduced the nuclear charge radii, which show an unusual lack of change at the neutron number N 20 shell closure. Plans include a search for scalar contributions to the b 1 -n correlation in the 0 1 ! 0 1 decay of 38 K m . [S0031-9007(97)03637-5] PACS numbers: 23.40. Bw, 29.25.Rm, 32.80.Pj, 32.80.Ys The novel use of magneto-optically trapped radioactive atoms promises improvements in performing symmetry tests of the standard model. Optically trapped atoms are confined in a small volume in space (a few mm 3 ), have negligible source thickness, and can be optically pumped to achieve close to 100% atomic and nuclear polarization. These conditions are favorable for carrying out experiments to study weak interaction symmetries in b decay [1-3], and to measure isotopic dependence of parity nonconservation (PNC) in heavy atoms [2,[4][5][6]. Here we measure nuclear properties of ground and isomeric states of the trapped atoms.Among alkali atoms, which have simple electronic structure convenient for laser trapping, potassium isotopes offer rich opportunities for b-decay experiments. 37 K and 38 K m each decay predominantly by a single superallowed transition. The b-n correlation in a I p 0 1 ! 0 1 Fermi decay is sensitive to the exchange of hypothetical scalar bosons. Limits on the scalar interaction are poor, both from b decay and from high-energy experiments, and a 1% measurement of the b-n correlation coefficient a would be competitive [7]. Among alkali atoms, isomeric 38 K m has the only such pure Fermi decay. The mixed Fermi-Gamow-Teller (I p 3͞2 1 ! 3͞2 1 ) decay of 37 K is suitable for b-asymmetry experiments and positron longitudinal polarization measurements [8], which are sensitive to the presence of right-handed currents in the weak interaction.The half-lives of 38 K m (0.925 s) and 37 K (1.226 s) are an order of magnitude shorter than isotopes trapped in related work elsewhere [1,4,9]. This creates an experimental challenge in the production and trapping of these isotopes; however, the shorter lifetimes make it easier to achieve trap lifetimes long enough that nearly all trapped atoms undergo radioactive decay while in the trap (collisions with residual gas at 10 29 Torr produce a trap lifetime of 10 s).Here we report the successful coupling of a magnetooptic trap (MOT) to the copious production of an online isotope separator (TISOL). With this arrangement we have trapped approximately 6000 atoms of 38 K m or 2000 atoms of 37 K, sufficient to begin b-decay experiments. We have measured the isotope shifts of 37 K, 38 K m in the trapping transition: the deduced nuclear charge radii show an unusual lack of change at the major neutron number N 20 shell closure. We also wil...

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mentioning

confidence: 99%

Magneto-optic Trapping ofβ-Decaying38Km,
Behr
¹
,
Gorelov
²
,
Swanson
³

et al. 1997
Phys. Rev. Lett.

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“…In Table 1, we show the improved solar neutrino fluxes for pp, pep, ^Be, ^B neutrinos for four models (column 1): YA, the Young and Amett model [8], A98, the Adelberger et al model [2], N99, the NACRE compflation [3], and BPB, the BahcaU, Pinsonneault and Basu model [9]. In columns 2 -5 we give the neutrino fluxes O for the different thermonuclear reaction of the /'/'-chain.…”

Section: Discussion Of the Results And Conclusionmentioning

confidence: 99%

Thermonuclear Reaction Rates for Solar Neutrino Processes

Karathanou¹,

Tsikoudi²,

Liolios³

et al. 2008

AIP Conference Proceedings

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“…Initially, the nuclear astrophysics community was skeptical, emphasizing the need to test the ANC technique before it could be adopted [26]. The first test was performed in 1999 [27].…”

Section: Astrophysicsmentioning

confidence: 99%

Fundamental Interactions, Nuclear Masses, Astrophysics, and QCD

Gagliardi

2008

AIP Conference Proceedings

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During his long and varied career, Robert Tribble has made important contributions in many areas of nuclear physics. He has set new limits on the existence of second-class currents, lepton-flavor violation, and right-handed interactions. He optimized the use of the (''He,*He) reaction to determine nuclear masses and study charge-dependent effects in nuclei. He has developed a new indirect procedure to determine astrophysical reaction rates and applied it to study important nuclear reactions that occur in our sun, in massive stars, and in novae. He has explored anti-quark distributions in nucleons and nuclei, and the polarization of gluons in the nucleon. A brief overview of Bob Tribble's many accomplishments is presented.Study of the fundamental interactions has been a recurring theme over the course of Bob Tribble's career. In the early 1970's, his dissertation research involved a search for second-class currents in nuclear beta decay. During the 1980's and '90's, he searched for the lepton-flavor violating decay |i -> ey. For the past decade, he has performed a sensitive search for right-handed interactions in normal muon decay.

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Improved limits on scalar weak couplings

Cited by 52 publications

References 17 publications

Magneto-optic Trapping ofβ-Decaying38Km,
Behr
¹
,
Gorelov
²
,
Swanson
³

et al. 1997
Phys. Rev. Lett.

Magneto-optic Trapping ofβ-Decaying38Km,
Behr
¹
,
Gorelov
²
,
Swanson
³

et al. 1997
Phys. Rev. Lett.

Thermonuclear Reaction Rates for Solar Neutrino Processes

Fundamental Interactions, Nuclear Masses, Astrophysics, and QCD

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Improved limits on scalar weak couplings

Cited by 52 publications

References 17 publications

Magneto-optic Trapping ofβ-Decaying38Km,Behr1, Gorelov2, Swanson3 et al. 1997Phys. Rev. Lett.

Magneto-optic Trapping ofβ-Decaying38Km,Behr1, Gorelov2, Swanson3 et al. 1997Phys. Rev. Lett.

Thermonuclear Reaction Rates for Solar Neutrino Processes

Fundamental Interactions, Nuclear Masses, Astrophysics, and QCD

Contact Info

Product

Resources

About

Magneto-optic Trapping ofβ-Decaying38Km,
Behr
¹
,
Gorelov
²
,
Swanson
³

et al. 1997
Phys. Rev. Lett.

Magneto-optic Trapping ofβ-Decaying38Km,
Behr
¹
,
Gorelov
²
,
Swanson
³

et al. 1997
Phys. Rev. Lett.