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1.
Phys Rev Lett ; 132(10): 102501, 2024 Mar 08.
Article in English | MEDLINE | ID: mdl-38518336

ABSTRACT

On the basis of revisions of some of the systematic errors, we reanalyzed the electron-antineutrino angular correlation (a coefficient) in free neutron decay inferred from the recoil energy spectrum of the protons which are detected in 4π by the aSPECT spectrometer. With a=-0.104 02(82) the new value differs only marginally from the one published in 2020. The experiment also has sensitivity to b, the Fierz interference term. From a correlated (b,a) fit to the proton recoil spectrum, we derive a limit of b=-0.0098(193) which translates into a somewhat improved 90% confidence interval region of -0.041≤b≤0.022 on this hypothetical term. Tighter constraints on b can be set from a combined [shown as superscript (c)] analysis of the PERKEO III (ß asymmetry) and aSPECT measurement which suggests a finite value of b with b^{(c)}=-0.0181±0.0065 deviating by 2.82σ from the standard model.

2.
Phys Rev Lett ; 129(1): 011806, 2022 Jul 01.
Article in English | MEDLINE | ID: mdl-35841544

ABSTRACT

We report on the direct search for cosmic relic neutrinos using data acquired during the first two science campaigns of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity molecular tritium gas source are analyzed by a high-resolution MAC-E filter around the end point at 18.57 keV. The analysis is sensitive to a local relic neutrino overdensity ratio of η<9.7×10^{10}/α (1.1×10^{11}/α) at a 90% (95%) confidence level with α=1 (0.5) for Majorana (Dirac) neutrinos. A fit of the integrated electron spectrum over a narrow interval around the end point accounting for relic neutrino captures in the tritium source reveals no significant overdensity. This work improves the results obtained by the previous neutrino mass experiments at Los Alamos and Troitsk. We furthermore update the projected final sensitivity of the KATRIN experiment to η<1×10^{10}/α at 90% confidence level, by relying on updated operational conditions.

3.
Phys Rev Lett ; 126(9): 091803, 2021 Mar 05.
Article in English | MEDLINE | ID: mdl-33750167

ABSTRACT

We report on the light sterile neutrino search from the first four-week science run of the KATRIN experiment in 2019. Beta-decay electrons from a high-purity gaseous molecular tritium source are analyzed by a high-resolution MAC-E filter down to 40 eV below the endpoint at 18.57 keV. We consider the framework with three active neutrinos and one sterile neutrino. The analysis is sensitive to the mass, m_{4}, of the fourth mass state for m_{4}^{2}≲1000 eV^{2} and to active-to-sterile neutrino mixing down to |U_{e4}|^{2}≳2×10^{-2}. No significant spectral distortion is observed and exclusion bounds on the sterile mass and mixing are reported. These new limits supersede the Mainz results for m_{4}^{2}≲1000 eV^{2} and improve the Troitsk bound for m_{4}^{2}<30 eV^{2}. The reactor and gallium anomalies are constrained for 100<Δm_{41}^{2}<1000 eV^{2}.

4.
Rev Sci Instrum ; 82(1): 013303, 2011 Jan.
Article in English | MEDLINE | ID: mdl-21280821

ABSTRACT

An electron-impact ion source based on photoelectron emission was developed for ionization of gases at pressures below 10(-4) mbar in an axial magnetic field in the order of 5 T. The ion source applies only dc fields, which makes it suitable for use in the presence of equipment sensitive to radio-frequency (RF) fields. The ion source was successfully tested under varying conditions regarding pressure, magnetic field, and magnetic-field gradient, and the results were studied with the help of simulations. The processes in the ion source are well understood, and possibilities for further optimization of generated ion currents are clarified.

5.
Phys Rev Lett ; 100(15): 151801, 2008 Apr 18.
Article in English | MEDLINE | ID: mdl-18518094

ABSTRACT

The proton asymmetry parameter C in neutron decay describes the angular correlation between neutron spin and proton momentum. In this Letter, the first measurement of this quantity is presented. The result C= -0.2377(26) agrees with the standard model expectation. The coefficient C provides an additional parameter for new and improved standard model tests.

6.
Phys Rev Lett ; 99(19): 191803, 2007 Nov 09.
Article in English | MEDLINE | ID: mdl-18233064

ABSTRACT

A new measurement of the neutrino asymmetry parameter B in neutron decay, the angular correlation between neutron spin and antineutrino momentum, is presented. The result, B=0.9802(50), confirms earlier measurements but features considerably smaller corrections. It agrees with the standard model expectation and permits updated tests on "new physics" in neutron decay.

7.
Phys Rev Lett ; 94(14): 142501, 2005 Apr 15.
Article in English | MEDLINE | ID: mdl-15904059

ABSTRACT

We have set limits on contributions of scalar interactions to nuclear beta decay. A magneto-optical trap provides a localized source of atoms suspended in space, so the low-energy recoiling nuclei can freely escape and be detected in coincidence with the beta. This allows reconstruction of the neutrino momentum, and the measurement of the beta-nu correlation, in a more direct fashion than previously possible. The beta-nu correlation parameter of the 0(+)-->0(+) pure Fermi decay of (38)K(m) is a =0.9981+/-0.0030+0.0032 / -0.0037, consistent with the standard model prediction a =1.

8.
J Res Natl Inst Stand Technol ; 110(4): 377-81, 2005.
Article in English | MEDLINE | ID: mdl-27308153

ABSTRACT

This article describes measurements of angular-correlation coefficients in the decay of free neutrons with the superconducting spectrometer PERKEO II. A method for measuring the ß-asymmetry coefficient A is presented, as well as a new method for determining the neutrino-asymmetry coefficient B, which allows a value for the proton-asymmetry coefficient C to be obtained for the first time. An ongoing experiment is trying to improve the accuracy of these quantities.

9.
Phys Rev Lett ; 88(21): 211801, 2002 May 27.
Article in English | MEDLINE | ID: mdl-12059473

ABSTRACT

We report on a new measurement of neutron beta-decay asymmetry. From the result A(0) = -0.1189(7), we derive the ratio of the axial vector to the vector coupling constant lambda = g(A)/g(V) = -1.2739(19). When included in the world average for the neutron lifetime tau = 885.7(7) s, this gives the first element of the Cabibbo-Kobayashi-Maskawa (CKM) matrix V(ud). With this value and the Particle Data Group values for V(us) and V(ub), we find a deviation from the unitarity condition for the first row of the CKM matrix of Delta = 0.0083(28), which is 3.0 times the stated error.

11.
Phys Rev D Part Fields ; 47(7): 2840-2848, 1993 Apr 01.
Article in English | MEDLINE | ID: mdl-10015887
12.
Phys Rev D Part Fields ; 46(5): 2090-2101, 1992 Sep 01.
Article in English | MEDLINE | ID: mdl-10015124
13.
Phys Rev D Part Fields ; 41(7): 2160-2173, 1990 Apr 01.
Article in English | MEDLINE | ID: mdl-10012593
14.
Phys Rev D Part Fields ; 40(1): 119-122, 1989 Jul 01.
Article in English | MEDLINE | ID: mdl-10011665
15.
South Med J ; 80(11): 1385-97, 1987 Nov.
Article in English | MEDLINE | ID: mdl-3317895

ABSTRACT

Internists are frequently asked to assess the surgical risk of patients with various medical problems. Numerous recent prospective studies have defined specific risk factors for increased morbidity and mortality in the preoperative evaluation of surgical patients. Careful attention to such factors as age, type of operation and anesthesia, underlying pulmonary, hypertensive, cardiac, renal, hepatic, endocrine, and hematologic diseases, and nutritional status can reduce the complication rate and death rate in surgical patients if specific preoperative, operative, and postoperative therapeutic maneuvers are instituted. A comprehensive comparative analysis by the internist, surgeon, and anesthesiologist should be made on all high-risk surgical patients to improve their medical care.


Subject(s)
Referral and Consultation , Surgical Procedures, Operative , Anesthesia , Humans , Preoperative Care , Risk Factors
18.
Am J Med ; 70(5): 1017-26, 1981 May.
Article in English | MEDLINE | ID: mdl-6112877

ABSTRACT

A family with multiple endocrine neoplasia type I (MEN-I) is described in which three members had A-cell pancreatic tumors. Two of these members had classic glucagonoma syndromes. The proband, a 62 year old woman, had a high (less than or equal to 9.2 ng/ml) basal plasma glucagon level, most of which eluted in the 3,500 dalton fraction. Plasma glucagon increased following the ingestion of mixed meals and arginine. Secretin, which, in the dog, has been reported to inhibit normal glucagon secretion, provoked a twofold increase in 3,500 dalton plasma glucagon concentration. Increased plasma glucagon in the proband was associated with mild hyperglycemia and insulin resistance. Somatostatin infusion suppressed peripheral glucagon and insulin levels, and increased blood glucose levels. The unique responses to secretin and somatostatin observed in this patient may be diagnostically important in syndromes of inappropriate or autonomous glucagon secretion.


Subject(s)
Adenoma, Islet Cell/genetics , Pancreatic Neoplasms/genetics , Adenoma, Islet Cell/metabolism , Adolescent , Arginine/metabolism , Blood Glucose/metabolism , Female , Glucagon/metabolism , Humans , Insulin/metabolism , Male , Middle Aged , Pancreatic Neoplasms/metabolism , Secretin/metabolism , Somatostatin/metabolism
19.
South Med J ; 71(12): 1521-3, 1978 Dec.
Article in English | MEDLINE | ID: mdl-103204

ABSTRACT

A 40-year-old man with primary hypothyroidism and sellar enlargement is described. There was deficiency of all pituitary tropic hormones except TSH which was elevated. TRH stimulation revealed responsiveness of pituitary thyrotropic cells, and thyroxine administration suppressed the elevated TSH. These findings are compatible with either a TSH-producing chromophobe adenoma resulting from primary hypothyroidism or, because of the suppressibility of the TSH secretion, thyrotropic hyperplasia secondary to hypothyroidism maintaining TSH secretion in the face of a non-TSH-secreting pituitary tumor.


Subject(s)
Hypopituitarism/complications , Hypothyroidism/complications , Adult , Humans , Hypopituitarism/blood , Hypothyroidism/blood , Male , Pituitary Neoplasms/complications , Radiography , Sella Turcica/diagnostic imaging , Thyrotropin/blood , Thyrotropin-Releasing Hormone , Thyroxine/blood , Triiodothyronine/blood
20.
J Clin Pharmacol ; 18(5-6): 241-8, 1978.
Article in English | MEDLINE | ID: mdl-346616

ABSTRACT

Halofenate, a triglyceride- and uric acid-lowering drug, potentiated the effect of oral hypoglycemics. Its effect on serial glucose tolerance was evaluated in ten patients with hypertriglyceridemia without overt diabetes. Six-hour oral glucose tolerance tests were done during a control period and every 24 weeks over two years of halofenate treatment. Abnormal glucose tolerance (chemical diabetes) was observed during the control period in six of ten patients. The number of abnormal tests gradually decreased to none by 48 weeks. Plasma glucose, insulin, and free fatty acid values during the glucose tolerance tests were reduced significantly. Halofenate induced significant serum uric acid reduction. No significant regressions were observed among levels of lipids, hormones, glucose, and uric acid. The mechanisms by which lipid-lowering drugs improve glucose tolerance are as yet unexplained.


Subject(s)
Blood Glucose/metabolism , Glycolates/pharmacology , Halofenate/pharmacology , Hyperlipidemias/blood , Adult , Clinical Trials as Topic , Clofibrate/pharmacology , Clofibrate/therapeutic use , Diabetes Complications , Diabetes Mellitus/blood , Double-Blind Method , Fatty Acids, Nonesterified/blood , Female , Glucose Tolerance Test , Halofenate/therapeutic use , Humans , Hyperlipidemias/complications , Hyperlipidemias/drug therapy , Insulin/blood , Male , Middle Aged , Triglycerides/blood , Uric Acid/blood
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